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JP2007150947

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JP2007150947
The present invention makes it possible to output music / sound reproduced by an audio player
using an audio device without connecting the audio player to an audio device with an audio
cable. SOLUTION: An input of a changeover switch 207 is switched between a modulation circuit
204 side and a DIT 213 side. An audio signal input from the digital audio player 100 to the
remote controller 200 is transmitted by the infrared transmission circuit 206 through the DIT
213, the changeover switch 207, and the amplifier 205. The code signal generated by the
microcomputer 201 is transmitted by the infrared transmission circuit 206 through the
modulation circuit 204, the changeover switch 207 and the amplifier 205. When the input of the
changeover switch 207 is on the DIT 213 side, the code generated by the microcomputer 201 is
inserted into the audio signal by the data insertion circuit 212. [Selected figure] Figure 2
Audio system, audio device and remote controller
[0001]
The present invention relates to an audio system, an audio device and a remote controller.
[0002]
In recent years, in addition to portable audio players that reproduce music recorded on music
CDs, portable digital audio players that reproduce music files recorded on a hard disk or
semiconductor memory are also in widespread use.
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1
A device to which such a portable digital audio player is applied has also been developed (see, for
example, Patent Document 1).
[0003]
In addition, the portable audio player can be connected to an audio device (for example, an audio
amplifier) with high sound quality and high output by an audio cable, and music reproduced by
the portable audio player can be output from a speaker using the audio device. In this way, you
can listen to quality music. Japanese Patent Application Publication No. 2004-116092
[0004]
However, because the portable audio player and the audio device have to be connected by an
audio cable, the audio cable may be in the way. Also, the input terminal for connecting the audio
cable is generally provided on the back of the audio device, and it is not easy to connect the
audio cable to the audio device. Also, if the audio cable is short, the position where the portable
audio player is to be placed is limited to the audio device, so it must be close to the audio device
to operate the portable audio player, and the remote control of the audio device is effective. It
can not be used. Therefore, the present invention has been made to solve the above-mentioned
problems, and even if the portable audio player is not connected to the audio apparatus with the
audio cable, the music and voice reproduced by the portable audio player are output using the
audio apparatus. The purpose is to be able to
[0005]
In order to solve the above problems, according to the present invention, firstly, an audio system
is provided with a remote controller capable of inputting an audio signal output by an audio
player through a cable, and an audio apparatus remotely controlled by the remote controller The
remote controller includes an operation unit having a key, code signal generation means for
generating a code signal of a code corresponding to the keys of the operation unit, and the code
signal generated by the code signal generation means, A switching unit that modulates the audio
signal input through the cable to a frequency different from that of the audio signal; a switching
unit that selectively outputs the audio signal input through the cable and the cocode signal
modulated by the modulation unit; Send the signal output by the signal Receiving means for
receiving the signal transmitted by the transmitting means, and demultiplexing means for
extracting the code signal and the audio signal from the signal received by the receiving means
according to the difference in frequency And a computer for analyzing the code of the code
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2
signal extracted by the demultiplexing means, and an output means for outputting an audio
signal extracted by the demultiplexing means to a speaker.
[0006]
In the first invention, the remote controller inserts the code of the code signal generated by the
code signal generation unit into the audio signal input through the cable, and the audio signal
into which the code is inserted is added to the switching unit. The audio apparatus further
comprises separation means for separating the code signal of the code inserted into the audio
signal extracted by the separation means, and the computer is separated by the separation
means. Preferably, the code of the code signal is analyzed, and the output means outputs an
audio signal separated from the code by the branching means to the speaker.
[0007]
In the present invention, secondly, the audio device is an audio signal input from the audio player
to the remote controller through the cable and a code signal of a code corresponding to the key
of the operation unit of the remote controller, Receiving means for receiving a signal transmitted
from the remote controller capable of selectively transmitting code signals of different
frequencies, and demultiplexing for extracting a code signal and an audio signal according to the
frequency difference from the signals received by the receiving means And a computer for
analyzing the code of the code signal extracted by the branching means, and an output means for
outputting the audio signal extracted by the branching means to the speaker.
[0008]
In the second aspect of the present invention, the computer further comprises separating means
for separating the code signal of the code inserted into the audio signal extracted by the
separating means, and the computer analyzes the code of the code signal separated by the
separating means. Preferably, the output means outputs an audio signal obtained by separating
the code signal by the demultiplexing means to the speaker.
[0009]
Further, in the present invention, thirdly, a remote controller for remotely operating the audio
apparatus comprises: an operation unit having a key; code signal generation means for
generating a code signal of a code corresponding to the key of the operation unit; Modulation
means for modulating the code signal generated by the code signal generation means to a
frequency different from that of the audio signal inputted from the audio player through the
cable, an audio signal inputted through the cable and a cocode signal modulated by the
modulation means And switching means for selectively outputting, and transmission means for
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transmitting a signal output by the switching signal.
[0010]
In the third invention, the remote controller inserts the code of the code signal generated by the
code signal generating means into the audio signal inputted through the cable, and the audio
signal into which the code is inserted is used as the switching means. It is preferable to further
comprise an inserting means for outputting.
[0011]
According to the present invention, when the audio player is connected to the remote controller
by the cable, the audio signal output by the audio player is input to the remote controller, and the
audio signal is transmitted to the audio apparatus by the transmission means of the remote
controller.
Therefore, music and sound reproduced by the audio player can be output using the audio device
without connecting the audio player to the audio device with an audio cable.
Therefore, the audio player can be placed at a distance from the audio device, and the trouble of
connecting the audio cable to the audio device can be eliminated, and the remote controller can
be used effectively.
[0012]
Also, since the frequency of the code signal and the frequency of the audio signal for remotely
operating the audio device are different, and the code signal and the audio signal are separately
extracted by the branching means of the audio device, the transmitting means of the remote
controller and the audio The receiving means of the device can be used both for transmitting and
receiving code signals and for transmitting and receiving audio signals.
Therefore, the configuration of the remote controller and the audio device is not complicated,
and the remote controller and the audio device can be provided at low cost.
01-05-2019
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[0013]
Also, the code of the code signal generated by the code signal generation means is inserted into
the audio signal by the insertion means, and the audio signal in which the code is inserted is
output to the switching means and transmitted by the transmission means.
The code signal is separated from the audio signal by the separation means of the audio device,
and the code signal is output to the computer of the audio device.
Therefore, even when the audio signal is transmitted from the remote controller to the audio
device and the music and voice reproduced by the audio player are output using the audio
device, the remote controller can remotely control the audio device.
[0014]
Hereinafter, the best mode for carrying out the present invention will be described with
reference to the drawings.
However, although various limitations preferable for carrying out the present invention are given
to the embodiments described below, the scope of the invention is not limited to the following
embodiments and the illustrated examples.
[0015]
First Embodiment FIG. 1 is an overall view of an audio system 1 according to the present
invention, and FIG. 2 is a block diagram of the audio system 1.
[0016]
The audio system 1 includes a digital audio player 100, a remote controller 200, and an audio
device 300.
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Here, the remote controller 200 is an accessory of the audio device 300, and transmits an
infrared signal to the audio device 300 to remotely control the audio device 300. Also, the digital
audio player 100 and the remote controller 200 are connected by a cable 400, and the cable 400
is removable from both the digital audio player 100 and the remote controller 200.
[0017]
The digital audio player 100 includes a microcomputer 101, a DSP (Digital Signal Processor)
103, a digital amplifier 104, an operation unit 105, a display unit 106, a storage unit 107, and a
connector 109.
[0018]
The storage unit 107 includes a storage medium such as a compact disk, hard disk or
semiconductor storage medium, and a drive for reading and writing the storage medium, and
stores audio files compressed in MP3 format, WMA format, AAC format or ATRAC3 format. It is
stored in the storage medium of the unit 107.
The storage medium of the storage unit 107 may be removable from the main body of the digital
audio player 100.
[0019]
The DSP 103 reads an audio file from the storage unit 107, decompresses the read audio file to
generate a digital audio signal, and outputs the generated digital audio signal to the digital
amplifier 104.
[0020]
The digital amplifier 104 performs switching amplification of the digital audio signal input from
the DSP 103 by the switching element, extracts an analog audio signal from the amplified signal
by the low pass filter, and outputs the analog audio signal to the speaker and connector 109 of
the headphone 111.
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The analog audio signal extracted by the digital amplifier is input to the remote controller 200
through the connector 109 and the cable 400.
[0021]
The headphone 111 has a speaker that converts an analog audio signal input from the digital
amplifier 104 into a sound.
[0022]
The operation unit 105 has various keys such as a play key 105 a and a selection key 105 b, and
outputs an operation signal corresponding to each key to the microcomputer 101 when these
keys are pressed.
[0023]
The display unit 106 is a display device such as a liquid crystal display or an electroluminescence
display, and performs display in accordance with a display control signal input from the
microcomputer 101.
For example, the display unit 106 displays the name of an audio file selected by the
microcomputer 101 and expanded by the DSP 103.
[0024]
The microcomputer 101 performs overall control of the digital audio player 100.
For example, the microcomputer 101 has a function of selecting one of audio files stored in the
storage unit 107 by an operation signal input from the operation unit 105 when the selection
key 105 b of the operation unit 105 is pressed. A function of transferring the selected audio file
or an audio file set by default from the storage unit 107 to the DSP 103 according to an
operation signal input from the operation unit 105 when the play key 105a of the operation unit
105 is pressed; It has a function of causing the DSP 103 to decompress the transferred audio file,
and a function of outputting a display control signal to the display unit 106 and causing the
display unit 106 to perform display.
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[0025]
Although described later in detail, the voltage VPlay (REM_V signal) output by the DAC (digitalto-analog converter) 202 of the microcomputer 201 of the remote controller 200 passes through
the cable 400 to the ADC (analog-) of the microcomputer 101. When input to the digital
converter 102, the microcomputer 101 transfers the selected audio file or an audio file set by
default from the storage unit 107 to the DSP 103, and decompresses the transferred audio file to
the DSP 103.
[0026]
The remote controller 200 includes a microcomputer 201, an operation unit 203, a modulation
circuit 204, an amplifier 205, an infrared transmission circuit 206, a changeover switch 207, a
connector 208, a changeover switch 209, an oscillator 210, and an ADC 211. , A data insertion
circuit 212, and a DIT (Digital Interface Transmitter) 213.
[0027]
The operation unit 203 has various keys such as a play key 203a, and when these keys are
pressed, outputs an operation signal corresponding to each key to the microcomputer 201.
The microcomputer 201 stores remote control codes assigned to the respective keys.
As shown in FIG. 3, the microcomputer 201 includes a remote control code (a custom code C0 of
8 bits, a custom code C1, a data code D, and an inverted data code invD) according to the
operation signal input from the operation unit 203. And generates a PPM remote control code
signal according to PPM (Pulse Position Modulation) method. Furthermore, as shown in FIG. 4,
the microcomputer 201 adds a reader code signal before the generated PPM remote control code
signal and a stop control signal after adding the stop bit signal after the PPM remote control
code signal (FIG. The REM_I signal is output to the modulation circuit 204 and the data insertion
circuit 212.
[0028]
The modulation circuit 204 modulates the code control signal output from the microcomputer
201 at a predetermined carrier frequency (for example, 38 kHz), and modulates the modulated
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8
code control signal (drive signal in FIG. 3 and FIG. 4) via the switch 207. Output to the amplifier
205.
[0029]
The changeover switch 207 selectively outputs the code control signal input from the
microcomputer 201 and the interface signal input from the DIT 213 to the amplifier 205.
The switching of the changeover switch 207 is performed by the changeover signal inputted
from the microcomputer 201.
[0030]
The changeover switch 209 selectively outputs the analog audio signal (AL ̶ 0 signal) input to
the connector 208 and the analog audio signal (AL ̶ 1 signal) input to the input terminal 214 to
the ADC 211. The switching of the changeover switch 209 is performed by the changeover signal
inputted from the microcomputer 201.
[0031]
The oscillator 210 generates a main clock signal (MCLK signal) which is an integral multiple of a
predetermined sampling frequency Fs. For example, as the main clock signal, a signal having a
frequency of 256 times the sampling frequency Fs is used. Besides, various frequencies may be
used depending on the IC used, such as 128 times, 512 times, etc. of the sampling frequency Fs.
[0032]
The ADC 211 samples the analog audio signal (AL_0 or AL_1) input from the changeover switch
209 according to the main clock signal input from the oscillator 210, thereby converting the
input analog audio signal into a digital audio signal (DATA_I signal), The data is output to the
data insertion circuit 212. Further, as shown in FIG. 5, the ADC 211 divides the main clock signal
input from the oscillator 210 and outputs a left / right switching clock signal (LRCK signal)
01-05-2019
9
having the same frequency as the sampling frequency Fs to the data insertion circuit 212.
Further, the ADC 211 divides the frequency of the main clock signal input from the oscillator
210 and outputs a serial audio clock signal (SCLK signal) (for example, 64 times the clock signal)
of the integer multiple of the sampling frequency Fs to the data insertion circuit 212 Output.
[0033]
The data insertion circuit 212 receives from the ADC 211 the remote control code of the PPM
remote control code signal among the code control signals input from the microcomputer 201 in
accordance with the left / right switching clock signal and serial audio clock signal input from
the ADC 211. Least significant bit of signal (LSB: see Figure 5). Insert into). Specifically, as shown
in FIG. 6, the data insertion circuit 212 samples the PPM remote control code signal of the code
control signal input from the microcomputer 201 and holds the PPM remote control code signal.
The circuit 221, a timing generation circuit 222 that outputs a signal that becomes high at the
timing of the least significant bit of the digital audio signal according to the left and right
switching clock signal and serial audio clock signal input from the ADC 211, and the signal input
from the timing generation circuit 222 When high, the PPM remote control code signal held in
the sample and hold circuit 221 is output, and when the signal input from the timing generation
circuit 222 is low, the digital audio input from the ADC 211 And a logic circuit 223 for
outputting a degree. 2 and 6, a signal obtained by inserting the PPM remote control code signal
output from the microcomputer 201 into the digital audio signal (DATA_I signal) of the ADC 211
is denoted as DATA_O.
[0034]
The DIT 213 converts the digital audio signal (DATA_O signal) input from the data insertion
circuit 212 into an interface signal of the IEC60958 standard. The interface signal converted by
the DIT 213 is input to the amplifier 205 via the changeover switch 207. Since the interface
signal output from the DIT 213 is modulated by the biphase mark signal, when the sampling
frequency Fs is 48 kHz, the frequency of the interface signal is 3.07 MHz to 6.14 MHz.
Therefore, the frequency of the code control signal modulated by the modulation circuit 204 is
different from the frequency of the interface signal.
[0035]
When the code control signal of the microcomputer 201 is prioritized by the changeover switch
207, the code control signal input from the microcomputer 201 is amplified by the amplifier 205
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10
and output to the infrared transmission circuit 206, and the changeover switch 207 outputs the
digital signal of DIT 213. When the audio signal is prioritized, the digital audio signal of the DIT
213 is amplified by the amplifier 205 and output to the infrared transmission circuit 206.
[0036]
The infrared transmission circuit 206 causes the infrared light emitting diode to emit light in
accordance with the signal input from the amplifier 205 to transmit the signal input from the
amplifier 205 to the audio apparatus 300 by infrared.
[0037]
The microcomputer 201 performs overall control of the remote controller 200.
For example, as described above, the microcomputer 201 has a function of outputting a code
control signal (REM_I signal) to the modulation circuit 204 and the data insertion circuit 212 in
accordance with the operation signal input from the operation unit 203.
[0038]
The microcomputer 201 also has a function of storing an operation flag for determining the
operation mode of the remote controller 200.
The operation modes of the remote controller 200 include a normal remote control mode in
which the operation flag is "0" and a digital audio player input mode in which the operation flag
is "1".
[0039]
When the operation flag stored in the microcomputer 201 is “1 (digital audio player input
mode)”, the microcomputer 201 performs the output of the switch 207 by giving priority to the
digital audio signal of the DIT 213 to the amplifier 205. And a function of outputting the voltage
VPlay to the connector 208 by the DAC 202 when the play key 203a of the operation unit 203 is
pressed.
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[0040]
When the operation flag stored in the microcomputer 201 is “0 (normal remote control
mode)”, the microcomputer 201 gives priority to the code control signal of the modulation
circuit 204 to the amplifier 205 and outputs the switch 207. Have the ability to
[0041]
Further, the operation flag stored in the microcomputer 201 is rewritten by any of the following
(1) to (4).
[0042]
(1) Digital Audio Player Input Mode Key of Operation Unit 203 The digital audio player input
mode key 203 b is provided in the operation unit 203, and when the digital audio player input
mode key 203 b of the operation unit 203 is pressed, the microcomputer 201 rewrites the
operation flag from "0" to "1".
[0043]
(2) Switch of Operation Unit 203 The operation unit 203 is provided with a switch, and when the
switch is switched, the microcomputer 201 rewrites the operation flag from "0" to "1" or vice
versa.
[0044]
(3) Connection Status of Connector 208 The microcomputer 201 detects whether the cable 400
is connected to the connector 208 or not.
As a result of the detection, when the cable 400 is not connected to the connector 208, the
microcomputer 201 stores the operation flag as "0", and when the cable 400 is connected to the
connector 208, the microcomputer 201 stores the operation flag. The operation flag is stored as
"1".
[0045]
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12
(4) Zero Detection Output of ADC 211 The ADC 211 has a function of outputting to the
microcomputer 201 a zero detection signal which becomes high when an analog audio signal is
not input and becomes low when an analog audio signal is input.
Then, the microcomputer 201 has a function of measuring the time when the zero detection
signal of the ADC 211 is high, a function of storing the operation flag as “0” when the
measured time has passed, and the measured time When the predetermined time does not elapse
or when the zero detection signal of the ADC 211 becomes low, the operation flag is stored as
“1”.
[0046]
When the microcomputer 201 has all the functions (1) to (4), it is particularly important that the
microcomputer 201 prioritizes which of the above (1) to (4) to determine the operation flag. It is
not limited.
[0047]
When the microcomputer 201 rewrites the operation flag from "0" to "1", the microcomputer
201 modulates the code control signal including the PPM remote control code signal in which
the remote control code becomes "digital audio player input mode". Output to
Thus, the code control signal is transmitted to the audio apparatus 300 by the emission of the
infrared light emitting diode of the infrared transmission circuit 206.
[0048]
The audio device 300 includes a microcomputer 301, an infrared receiving circuit 302, a
demultiplexer 303, a detection circuit 304, a waveform shaping circuit 305, a waveform shaping
circuit 306, a DIR (Digital Interface Receiver) 307, and data separation. A circuit 308, a DAC 309,
a changeover switch 310, a volume adjuster 311, and an amplifier 312 are provided.
[0049]
The infrared ray receiving circuit 302 receives the infrared ray emitted from the infrared ray
transmitting circuit 206 by the light receiving element and photoelectrically converts it, thereby
receiving the signal transmitted from the infrared ray transmitting circuit 206.
01-05-2019
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[0050]
The splitter 303 has a plurality of band pass filters for extracting the signal of the component of
the specific frequency, and splits the signal input from the infrared transmission circuit 206 into
the detection circuit 304 and the waveform shaping circuit 305.
Specifically, the demultiplexer 303 extracts a code control signal by removing unnecessary
signals and noises and the like included in the signal received by the infrared transmission circuit
206 by a band pass filter, and detects the extracted code control signal. It outputs to the circuit
304.
Furthermore, the duplexer 303 extracts an interface signal by removing unnecessary signals and
noise contained in the signal received by the infrared transmission circuit 206 by another band
pass filter, and the extracted interface signal is subjected to the waveform shaping circuit 306.
Output to
[0051]
The detection circuit 304 detects the code control signal output from the splitter 303,
demodulates it to a PPM remote control code signal, and outputs the PPM remote control code
signal to the waveform shaping circuit 305.
The waveform shaping circuit 305 shapes the waveform of the PPM remote control code signal
output from the detection circuit 304 and outputs the shaped signal to the microcomputer 301.
The microcomputer 301 analyzes the remote control code of the PPM remote control code
signal, and operates each part of the audio apparatus 300 according to the obtained remote
control code.
For example, the microcomputer 301 increases or decreases the output of the volume adjuster
311 according to the remote control code.
01-05-2019
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[0052]
The waveform shaping circuit 306 shapes the waveform of the interface signal output from the
splitter 303 and outputs the waveform to the DIR 307.
[0053]
The DIR 307 converts the interface signal of the IEC60958 standard input from the waveform
shaping circuit 306 into a digital audio signal (DT_I signal).
The digital audio signal converted by the DIT 307 is output to the data separation circuit 308.
Also, the DIR 307 generates a left / right switching clock signal (LRCK signal) and a serial audio
clock signal (BCK signal) in accordance with the input interface signal, and outputs the generated
signal to the data separation circuit 308. The DIR 307 selectively converts the interface signal
input to the input terminals 313 and 314 and the interface signal input from the waveform
shaping circuit 306 into a digital audio signal, and the input switching of the DIR 307 is input
from the microcomputer 301. It is performed by the switching signal.
[0054]
The data separation circuit 308 separates the remote control code of the least significant bit of
the digital audio signal (DT_I signal) input from the DIR 307 as a PPM remote control code signal
according to the left / right switching clock signal and serial audio clock signal input from the
DIR 307. Specifically, as shown in FIG. 7, the data separation circuit 308 outputs a signal that
becomes high at the timing of the least significant bit of the digital audio signal according to the
left / right switching clock signal and the serial audio clock signal input from the DIR 307. The
generation circuit 321, the logic circuit 322 that outputs the digital audio signal input from the
DIR 307 when the signal input from the timing generation circuit 321 is low, and the signal from
the DIR 307 when the signal input from the timing generation circuit 321 is high The sample and
hold circuit 323 holds the remote control code of the least significant bit by sampling the least
significant bit of the input digital audio signal, and outputs the PPM remote control code signal
of the held remote control code. That. 2 and 7, the separated PPM remote control code signal is
indicated as REM_O, and the digital audio signal obtained by separating the PPM remote control
code signal is indicated as DT_O.
01-05-2019
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[0055]
The DAC 309 converts the digital audio signal input from the data separation circuit 308 into an
analog audio signal, and outputs the analog audio signal to the volume adjuster 311 via the
changeover switch 310.
[0056]
The changeover switch 310 selectively outputs the analog audio signal input from the DAC 309
and the analog audio signal input from the input terminals 315 and 316 to the volume adjuster
311.
The switching of the changeover switch 310 is performed by the changeover signal inputted
from the microcomputer 301.
[0057]
The volume adjuster 311 adjusts the magnitude of the analog audio signal input from the
changeover switch 310 in accordance with the volume control signal input from the
microcomputer 301. The amplifier 312 amplifies the analog audio signal input from the volume
adjuster 311. The amplifier 312 is an output unit, and the analog audio signal amplified by the
amplifier 312 is output to the speaker 500, and the analog audio signal input from the amplifier
312 is converted to sound by the speaker 500.
[0058]
The microcomputer 301 performs overall control of the audio device 300. For example, the
microcomputer 301 outputs the volume control signal according to the PPM remote control code
signal input from the data separation circuit 308 or the waveform shaping circuit 305 to the
volume adjuster 311, and the magnitude of the analog audio signal is adjusted. Has a function to
adjust.
[0059]
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Further, when the microcomputer 301 inputs from the data separation circuit 308 or the
waveform shaping circuit 305 a PPM remote control code signal in which the remote control
code is in the “digital audio player input mode”, the interface signal of the waveform shaping
circuit 306 is data And the function of causing the output of the DIR 307 to be performed
preferentially to the separation circuit 308. Further, when the microcomputer 301 receives from
the data separation circuit 308 or the waveform shaping circuit 305 a PPM remote control code
signal in which the remote control code is in the "digital audio player input mode", the
microcomputer 301 adjusts the volume of the analog audio signal of the DAC 309. It has a
function of causing the output of the changeover switch 310 to be prioritized over 311.
[0060]
Next, the operation and usage of the audio system 1 will be described.
[0061]
(A) In the case of the normal remote control mode When the operation mode of the remote
controller 200 is the normal remote control mode, the microcomputer 201 stores an operation
flag of “0”.
At this time, the microcomputer 201 outputs a switching signal to the switch 207, whereby the
switch 207 outputs the input from the modulation circuit 204 to the amplifier 205. At this time,
when the user presses a key of the operation unit 203, an operation signal corresponding to the
key is output from the operation unit 203 to the microcomputer 201, and the PPM remote
control code signal corresponding to the operation signal input by the microcomputer 201 is The
contained code control signal is output to the modulation circuit 204. As a result, the code
control signal is modulated by the modulation circuit 204, amplified by the amplifier 205, and
transmitted by the infrared transmission circuit 206. The code control signal transmitted by the
infrared transmission circuit 206 is received by the infrared receiving circuit 302, the code
control signal is output from the splitter 303 to the detection circuit 304, and the PPM remote
control code signal is detected from the code control signal. The PPM remote control code signal
is demodulated by the waveform shaping circuit 305 and input to the microcomputer 301. The
microcomputer 301 operates in accordance with the input PPM remote control code signal.
[0062]
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(B) Digital Audio Player Input Mode The user connects both ends of the cable 400 to the
connectors 109 and 208, respectively.
[0063]
When the user depresses the digital audio player input mode key 203b of the operation unit 203,
the microcomputer 201 rewrites the operation flag from "0" to "1", and the remote control code
becomes "digital audio player input mode". The code control signal including the PPM remote
control code signal is output to the modulation circuit 204, and the code control signal is
transmitted to the audio apparatus 300 by the infrared transmission circuit 206.
When the code control signal is received by the infrared receiving circuit 302 and the PPM
remote control code signal of the code control signal is input from the waveform shaping circuit
305 to the microcomputer 301, the microcomputer 301 switches the DIR 307 and the switch
310 to the switching signal. In this state, the switch 310 outputs the input from the DAC 309 to
the volume adjuster 311, and the DIR 307 outputs the input from the waveform shaping circuit
306 to the data separation circuit 308.
[0064]
When the user releases the pressing of the digital audio player input mode key 203b, the
microcomputer 201 stops outputting the code control signal. Then, the microcomputer 201
outputs the switch signal to the switch 207, and the switch 207 outputs the input of the DIT 213
to the amplifier 205. The operations of the microcomputer 201 and the microcomputer 301
from when the user depresses the digital audio player input mode key 203b to when it is
released may be performed when the cable 400 is inserted into the connector 208. This may be
performed when the switch of the unit 203 is switched, or may be performed when an analog
audio signal is continuously input to the ADC 211 for a predetermined time.
[0065]
Then, when the user presses the play key 203a of the remote controller 200, the microcomputer
201 outputs the voltage VPlay, and the microcomputer 101 having input the voltage VPlay starts
transferring the audio file of the storage unit 107 to the DSP 103. Alternatively, when the user
01-05-2019
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presses the play key 105a of the digital audio player 100, an operation signal corresponding
thereto is input to the microcomputer 101, and the microcomputer 101 starts transferring the
audio file of the storage unit 107 to the DSP 103. Thus, the audio file is reproduced by the digital
audio player 100.
[0066]
When an audio file is being reproduced by the digital audio player 100, a digital audio signal is
generated by decompression by the DSP 103, and an analog audio signal is extracted by the
digital amplifier 104 from the digital audio signal output from the DSP 103 and output by the
digital amplifier 104 The analog audio signal thus input is input to the headphone 111 and also
input to the remote controller 200 via the cable 400.
[0067]
When the cable 400 is connected to the connector 208, the input of the changeover switch 209
is switched to the connector 208 side, so the analog audio signal input from the cable 400 is
input to the ADC 211.
The analog audio signal is converted to a digital audio signal (DATA_I signal) by the ADC 211, the
digital audio signal output from the ADC 211 is input from the data insertion circuit 212 to the
DIT 213, and the digital audio signal is converted to an interface signal of IEC60958 standard by
the DIT 213 Ru. Here, since the input of the changeover switch 207 is switched to the DIT 213
side, the interface signal output by the DIT 213 is input to the amplifier 205 and amplified, and
the amplified interface signal is transmitted by the infrared transmission circuit 206 as an
infrared signal. Ru.
[0068]
In the audio device 300, the interface signal is received by the infrared receiving circuit 302, and
the interface signal is output to the waveform shaping circuit 306 by extraction of the splitter
303 and then shaped by the waveform shaping circuit 306. Here, since the input of the DIR 307
is switched to the side of the waveform shaping circuit 306, the interface signal output by the
waveform shaping circuit 306 is converted into a digital audio signal by the DIR 307, and the
digital audio signal output by the DIR 307 is a data separation circuit The digital audio signal is
input to the DAC 309 from 308 and converted to an analog audio signal by the DAC 309. Here,
01-05-2019
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since the input of the changeover switch 310 is switched to the DAC 309 side, the analog audio
signal output by the DAC 309 is adjusted in size by the volume adjuster 311, and the analog
audio signal output by the volume adjuster 311 is amplified. The signal is amplified at 312 and
output to the speaker 500. Thus, the sound is output from the speaker 500.
[0069]
When an audio file is reproduced by the digital audio player 100 and a sound is output from the
speaker 500, when the user presses a key of the operation unit 203, an operation signal is
output from the operation unit 203 and input to the microcomputer 201. . The microcomputer
201 outputs a code control signal including a PPM remote control code signal of the remote
control code according to the input operation signal to the data insertion circuit 212. Here, since
the input of the changeover switch 207 is switched to the DIT 213 side, the code control signal
output by the microcomputer 201 is not input to the amplifier 205.
[0070]
The data insertion circuit 212 is a remote control code (value) of the PPM remote control code
signal of the code control signal output by the microcomputer 201 at the edge (rising or falling)
timing of the left / right switching clock signal output by the ADC 211 Are sampled and held by
the sample and hold circuit 221. The value of the held PPM remote control code signal is
inserted by the logic circuit 223 at a designated position of the digital audio signal output by the
ADC 211 at the timing generated by the timing generation circuit 222. Here, the value of the
PPM remote control code signal is inserted into the least significant bit of the digital audio signal.
[0071]
The digital audio signal into which the PPM remote control code signal is inserted is converted
into an interface signal by the DIT 213 and transmitted to the audio apparatus 300 by the
infrared transmission circuit 206. Then, the interface signal received by the infrared receiving
circuit 302 is converted by the DIR 307 into a digital audio signal. The data separation circuit
308 separates the PPM remote control code signal from the digital audio signal outputted by the
DIR 307 by the sample and hold circuit 323 at the timing created by the timing generation
circuit 321. On the other hand, the data separation circuit 308 separates other than the
01-05-2019
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component of the PPM remote control code signal from the digital audio signal outputted by the
DIR 307 by the logic circuit 322 at the timing created by the timing generation circuit 321.
[0072]
A digital audio signal obtained by separating the PPM remote control code signal is input to the
DAC 309, whereby the speaker 500 outputs a sound. On the other hand, the PPM remote control
code signal (REM_O signal) separated by the data separation circuit 308 is input to the
microcomputer 301, and the microcomputer 301 operates in accordance with the PPM remote
control code signal. Therefore, even when the audio file is reproduced by the digital audio player
100 and the sound is outputted from the speaker 500 by the remote controller 200 and the
audio device 300, the remote control by the remote controller 200 is effective, and the user can
If the key of the operation unit 203 is pressed, the audio device 300 can be remotely controlled
accordingly. For example, even if the music and sound of the audio file being reproduced by the
digital audio player 100 are output from the speaker 500, if the user depresses the volume
adjustment key of the operation unit 203, the microcomputer 301 causes the volume adjuster
311 to Since the control is performed, the volume output from the speaker 500 is adjusted.
[0073]
When the operation mode of the remote controller 200 is the digital audio player input mode,
that is, when the microcomputer 201 stores the operation flag of “1”, the user operates the
digital audio player input mode key 203 b of the operation unit 203. When the key is pressed,
the microcomputer 201 rewrites the operation flag from "1" to "0", and further the PPM remote
control code signal for which the remote control code becomes "normal remote control mode" is
output to the data insertion circuit 212, and the PPM remote control · A remote control code of
the code signal is inserted into the digital audio signal, and the microcomputer passes through
the DIT 213, the changeover switch 207, the infrared transmission circuit 206, the infrared
reception circuit 302, the demultiplexer 303, the waveform shaping circuit 306, and the DIR 307
01 is input to. The microcomputer 301 which has input the PPM remote control code signal in
which the remote control code becomes "normal remote control mode" outputs the data from the
input terminal 313 or the input terminal 314 to the data separation circuit by outputting to the
DIR 307 and the changeover switch 310. In this state, the switch 310 outputs the input from the
input terminal 315 or the input terminal 316 to the volume adjuster 311.
[0074]
01-05-2019
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When the user releases the pressing of the digital audio player input mode key 203b, the
microcomputer 201 stops outputting the code control signal. Then, the microcomputer 201
outputs the switch signal to the switch 207, and the switch 207 outputs the input of the
modulation circuit 204 to the amplifier 205. Thus, the remote controller 200 operates in the
normal remote control mode. As described above, the operations of the microcomputer 201 and
the microcomputer 301 during the period from when the user presses the digital audio player
input mode key 203b until the user releases the same are performed when the cable 400 is
removed from the connector 208. It may be performed when the switch of the operation unit
203 is switched, or may be performed when the analog audio signal is not continuously input to
the ADC 211 for a predetermined time.
[0075]
As described above, according to the present embodiment, music and sound reproduced by the
digital audio player 100 are output from the speaker 500 using the audio device 300 without
connecting the digital audio player 100 to the audio device 300 with an audio cable. be able to.
Therefore, the digital audio player 100 can be placed at a distance from the audio device 300,
and the trouble of connecting a cable to the back of the audio device 300 can be eliminated, and
the remote controller 200 of the audio device 300 can be used effectively. .
[0076]
Also, by modulating the code control signal by the modulation circuit 204, digitizing the audio
signal by the ADC 211, or converting the audio signal by the DIT 213, the code control signal is
transmitted to the signal transmitted from the infrared transmission circuit 206. Since the
frequency of the audio signal (interface signal) is different, and the signal transmitted from the
infrared transmission circuit 206 is branched into the code control signal and the audio signal
(interface signal) by the demultiplexer 303, the infrared transmission of the remote controller
200 The circuit 206 and the infrared receiving circuit 302 of the audio device 300 can be used
both for transmitting and receiving code control signals and for transmitting and receiving audio
signals. Therefore, the configurations of the remote controller 200 and the audio device 300 are
not complicated, and the remote controller 200 and the audio device 300 can be provided at low
cost.
01-05-2019
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[0077]
Also, a state in which the code of the PPM remote control code signal generated by the
microcomputer 201 of the remote controller 200 is inserted into the digital audio signal by the
data insertion circuit 212, and the digital audio signal into which the code is inserted is
converted into an interface signal. Are transmitted from the remote controller 200 to the audio
device 300. Then, in the audio device 300, the PPM remote control code signal is separated from
the received digital audio signal (interface signal) by the data separation circuit, and the
separated PPM remote control code signal is output to the microcomputer 301. Therefore, even
when the digital audio signal is transmitted from the remote controller 200 to the audio device
300 and the music / sound reproduced by the digital audio player 100 is output by the audio
device 300, the remote controller 200 remotely controls the audio device 300. can do.
[0078]
In the present embodiment, the connector 109 and the connector 208 are connected by the
cable 400, but the output terminal 110 and the input terminal 214 for outputting an analog
audio signal to the headphone 111 may be connected by the cable. In this case, when the cable is
connected to the input terminal 214, the input of the changeover switch 209 is switched to the
input terminal 214 side by the microcomputer 201. Therefore, from the digital audio player 100,
the output terminal 110, the cable, the input terminal The analog audio signal input to the
changeover switch 209 through 214 is output to the ADC 211.
[0079]
Second Embodiment FIG. 8 is a block diagram of an audio system 1A according to a second
embodiment. In FIG. 8, the same parts as those of the audio system 1 of FIG. 2 are denoted by the
same reference numerals, and the detailed description of the same parts as the first embodiment
is omitted, and parts different from the first embodiment will be described.
[0080]
In the first embodiment, the audio signal output from the digital audio player 100 is an analog
signal, but in the second embodiment, the audio signal output from the digital audio player 100
is a digital signal.
01-05-2019
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[0081]
Specifically, the digital audio player 100 further includes a DIT 112, the input of the DIT 112 is
connected to the output of the DSP 103, the connector 109 is not connected to the output of the
digital amplifier 104, and is connected to the output of the DIT 112.
The digital audio signal generated by the DSP 103 decompressing the audio file of the storage
unit 107 is also output to the DIT 112 in addition to the digital amplifier 104. The digital audio
signal input by the DIT 112 is converted into an interface signal of the IEC60958 standard and
output to the connector 109, and the interface signal is input to the connector 208 through the
cable 400.
[0082]
On the other hand, the remote controller 200 further includes a DIR 215, and the input of the
DIR 215 is connected to the connector 208. The input of the ADC 211 is not connected to the
output of the changeover switch 209, but is connected to the input terminal 214, one input of
the changeover switch 209 is connected to the output of the ADC 211, and the other input of the
changeover switch 209 is connected to the output of DIR 215. The output of switch 209 is
connected to the input of data insertion circuit 212. Therefore, an interface signal input from the
digital audio player 100 to the DIR 215 is converted into a digital audio signal by the DIR 215
and output to the changeover switch 215. When the cable 400 is connected to the connector
208, since the input of the changeover switch 209 is switched to the DIR 215 side by the
microcomputer 201, the digital audio signal (DATA_I signal) output from the DIR 215, the left /
right switching clock signal ( The LRCK signal) and the serial audio clock signal (SCLK signal) are
input to the data insertion circuit 212. The data insertion circuit 212 functions in the same
manner as in the first embodiment.
[0083]
Also in the present embodiment, music and sound reproduced by the digital audio player 100
can be output from the speaker 500 using the audio device 300 without connecting the digital
audio player 100 to the audio device 300 with a cable.
[0084]
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In each of the above-described embodiments, the audio player connected to the remote controller
200 is not limited to the digital audio player 100, and may be a disc reproduction type audio
player capable of reproducing music recorded on a disc.
When the disc reproduction type audio player outputs an analog audio signal, the output of the
disc reproduction type audio player and the input terminal 214 of FIG. 1 or FIG. 2 or the
connector 208 of FIG. When the digital audio player outputs a digital audio signal, the output of
the disc reproduction type audio player may be connected to the connector 208 of FIG. 2 by a
cable.
[0085]
FIG. 1 is an overall view of an audio system according to a first embodiment of the present
invention. It is a block diagram of the audio system in 1st Embodiment of this invention. It is a
figure for demonstrating the signal of the remote control code | cord | chord generate | occur |
produced by the microcomputer of a remote control. It is a figure for demonstrating the code |
cord control signal produced | generated by the microcomputer of a remote controller. It is a
figure for demonstrating digital audio signal (DATA_I) and serial audio clock signal (SCLK) leftright switching clock signal (LRCK). It is a circuit diagram of a data insertion circuit. It is a circuit
diagram of a data separation circuit. It is a block diagram of the audio system in 2nd
Embodiment of this invention.
Explanation of sign
[0086]
Reference Signs List 1 1A audio system 100 digital audio player 200 remote controller 201
microcomputer 203 operation unit 204 modulation circuit 206 infrared transmission circuit 207
changeover switch 208 connector 211 ADC 212 data insertion circuit 213 DIT 300 audio device
301 microcomputer 302 infrared receiving circuit 303 minutes Wave form 307 DIR 308 Data
separation circuit 309 DAC 312 Amplifier 400 Cable 500 Speaker
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