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DESCRIPTION JP2004128812

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DESCRIPTION JP2004128812
An object of the present invention is to reduce the burden on the ear due to sound output from
headphones or the like. An output control means (output control circuit 22) for outputting an
audio signal to a first audio output means (built-in speaker 26) or a second audio output means
(headphones 27), and a second audio output means When the second audio output means is
connected to the connection terminal (connection terminal 25) to be connected and the
connection terminal, the output control means is controlled to output the audio signal from the
first audio output means to the second audio output means. Volume control means for
performing fade-in processing on the audio signal at the start of audio output after switching of
the output destination to the second audio output means by the control means (CPU 28) And a
circuit 21). [Selected figure] Figure 1
Audio output device and volume control method
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
audio output device and a volume control method. [0002] A built-in speaker and a connection
terminal are provided, and the connection terminal is referred to as a headphone or an earphone
(hereinafter referred to as a headphone or the like). ) Is connected, there is an audio output
device that outputs an audio signal to the connection terminal. [0003] By the way, the conversion
efficiency from an electric signal to sound differs between the speaker and the headphone, and
the conversion efficiency of the headphone is usually higher. Therefore, when the audio signal
output to the built-in speaker is output as it is to a headphone or the like, a loud sound may be
output, which may burden the ear. Therefore, in order to prevent such a defect, for example, as
shown in Patent Document 1, an invention in which the volume of the built-in speaker and the
headphones etc. can be set separately, as shown in Patent Document 2 Furthermore, when
headphones or the like are connected, the invention is disclosed that can individually set the
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volume by changing the amplification factor of the amplification circuit. [Patent Document 1]
Japanese Patent Application Laid-Open No. 8-79877 (abstract, FIG. 1) [Patent Document 2]
Japanese Utility Model Application Publication No. 57-185215 (claim for utility model
registration, FIG. 3) [Problems to be Solved by the Invention] Incidentally, in the case of a
portable voice output device, in order to suppress power consumption of a battery which is a
power supply, a case where control is performed so as not to supply power to circuits not used.
There is. For example, in the case of the above-described audio output device, when an audio
signal is output to a headphone or the like, the supply of power supply power to circuits related
to the built-in speaker is stopped, while an audio signal is output to the built-in speaker If this is
the case, it is practiced to stop the supply of power to circuits related to headphones and the like.
In such a case, when the power to the circuit is turned on / off, the circuit becomes unstable due
to a transient phenomenon when the circuit starts or stops, and pop noise etc. are output, for
example. May be In the case of an audio output means having high conversion efficiency such as
headphones, such pop noise has a problem that the pop noise is reproduced with a large sound,
which places a heavy burden on the ear. . Further, when pop noise is reproduced, there is a
problem that an audio signal immediately before or after may be masked by a masking effect and
important information may be missed.
Furthermore, in the case of a transmitting and receiving apparatus that transmits and receives an
audio signal, the output of the audio signal may be suddenly started or stopped, for example,
when switching between the transmitting state and the receiving state. In such a case, the sound
may be suddenly output to headphones connected to the outside or the sound being output may
be suddenly stopped, which may cause a load on the ear. . The present invention has been made
based on the above circumstances, and an object thereof is an audio output device and a volume
control method capable of reducing the burden on the ear by the sound output from a
headphone or the like. To provide. In order to achieve the above object, the present invention
provides an output control means for outputting an audio signal to a first audio output means or
a second audio output means, and When the second audio output means is connected to the
connection terminal to which the audio output means is connected and the connection terminal,
the output control means is controlled to output the audio signal from the first audio output
means to the second audio output means. And audio volume control means for performing fadein processing on the audio signal at the start of audio output after switching of the output
destination to the second audio output means by the control means. ing. In addition to the abovedescribed invention, another invention is such that the connection terminal is connected to a
headphone or an earphone as a second audio output unit. According to another invention, in
addition to the above-mentioned inventions, the volume control means is an audio signal in
which the level of the audio signal supplied to the connection terminal is supplied to the first
audio output means in the fade-in process. If a predetermined level lower than the level is
reached, the level is maintained. In addition to the above-mentioned inventions, in the case where
the sound volume control means stops the audio output of the second audio output means,
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another invention fades out with respect to the audio signal supplied to the connection terminal.
I am trying to do the processing. In addition to the above-mentioned inventions, another
invention comprises receiving means for receiving an audio signal, and the volume control means
is connected to the connection terminal after the second audio output means is connected by the
receiving means. The fade-in process is performed on the audio signal at the start of audio output
when the reception of the audio signal is started. In addition to the above-described invention,
the volume control means performs fade-out processing on the audio signal of the channel before
the change when the reception means changes the reception channel, and A fade-in process is
performed on the audio signal of the channel.
Further, according to the present invention, an output control means for outputting an audio
signal to the first audio output means or the second audio output means, and an audio signal
from the first audio output means and the second audio output means A selection means for
selecting an output destination, and a volume control means for performing fade-in processing
on an audio signal at the start of audio output after selection of an output destination to the
second audio output means by the selection means . Further, according to the present invention,
in the sound volume control method for controlling the sound volume of the sound output from
the first and second sound output means, when the second sound output means is connected to
the connection terminal of the sound output device. Switching the output destination of the audio
signal from the first audio output means to the second audio output means, and fading the audio
signal at the start of the audio output after switching the output destination to the second audio
output means And a processing step of performing an in process. BEST MODE FOR CARRYING
OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with
reference to the drawings. FIG. 1 is a diagram showing a configuration example of the first
embodiment of the present invention. The first embodiment of the present invention shown in
this figure is configured as a transmission / reception device, and includes an audio generation
circuit 20, a volume control circuit 21, an output control circuit 22, an amplifier 23, an amplifier
24, a connection terminal 25, and a built-in speaker 26, a headphone 27, a CPU (Central
Processing Unit) 28, a memory 29, and a switching circuit 30. Here, the voice generation circuit
20 corresponding to the receiving means is a circuit that generates and outputs voice, and in the
first embodiment, is configured as a transmission / reception circuit. FIG. 2 is a diagram showing
a detailed configuration example of the sound generation circuit 20. As shown in FIG. As shown
in this figure, the audio generation circuit 20 is configured by an antenna 20a, an RF (Radio
Frequency) circuit 20b, a MODEM circuit (Modulation Demodulation) circuit 20c, an amplifier
20d, an amplifier 20e, and a microphone 20f. The antenna 20 a captures radio waves
transmitted from other transmission / reception devices, and emits radio waves to the other
transmission / reception devices. The RF circuit 20b extracts a radio wave of a specific frequency
from the radio wave captured by the antenna 20a, converts it into an electric signal and outputs
it, and amplifies the power of the modulated signal generated by the MODEM circuit 20c to
obtain an antenna Supply to 20a.
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The MODEM circuit 20c demodulates the electric signal output from the RF circuit 20b, takes out
the audio signal superimposed on the carrier wave, supplies it to the amplifier 20d, and uses the
audio signal output from the amplifier 20e to carry the carrier wave. The modulated signal
generated by modulation is supplied to the RF circuit 20b. The amplifier 20 d amplifies the audio
signal output from the MODEM circuit 20 c by a predetermined gain and outputs the amplified
audio signal to the volume control circuit 21. The amplifier 20 e amplifies the audio signal output
from the microphone 20 f with a predetermined gain and outputs the amplified signal to the
MODEM circuit 20 c. The microphone 20 f is a small microphone built in or connected to the
transmission / reception device, converts sound into a corresponding electric signal, and outputs
the electric signal to the amplifier 20 e. Returning to FIG. 1, the volume control circuit 21 which
is a part of the volume control means performs control to increase or decrease the volume of the
audio signal output from the audio generation circuit 20. The output control circuit 22 is an
output control unit that performs control to select the output destination of the audio signal
output from the volume control circuit 21 from any one of the amplifier 23 and the amplifier 24.
The amplifier 23 amplifies the audio signal output from the output control circuit 22 with a
predetermined gain and outputs the amplified signal to the built-in speaker 26. The amplifier 24
amplifies the audio signal output from the output control circuit 22 with a predetermined gain,
and outputs the amplified audio signal to the headphone 27 via the connection terminal 25. The
connection terminal 25 is a connection terminal to which the headphones 27 are detachably
connected. When the headphone 27 is connected to the connection terminal 25, a signal
indicating that is supplied to the CPU 28 from, for example, a switch (not shown). The built-in
speaker 26 corresponding to the first sound output means is a speaker provided in the housing
of the transmitting and receiving apparatus. The headphones 27 corresponding to the second
sound output means are small-sized speakers which are attachable to and detachable from the
connection terminal 25 and attached to the pinna of the user. The CPU 28, which is a control
unit, is a control circuit that controls the sound generation circuit 20, the volume control circuit
21, the output control circuit 22, and the switching circuit 30 based on a program stored in the
memory 29. The memory 29 is a storage element that stores programs executed by the CPU 28,
data, and the like.
FIG. 3 is a diagram showing an example of information stored in the memory 29. As shown in
FIG. In this example, "volume of built-in speaker", "volume of headphones", "timer setting value",
"volume increase value", "volume decrease value", "priority channel", and "priority scan timer
setting" are shown. Information is stored. In addition, the description about each item is
mentioned later. The switching circuit 30 supplies power source power to either one of the
amplifier 23 and the amplifier 24 in response to the control of the CPU 28 to enable operation.
Next, the operation of the first embodiment described above will be described. In the following,
first, the operation when the headphone 27 is connected to the connection terminal 25 will be
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described with reference to the flowchart shown in FIG. When power is supplied to the
transmission / reception apparatus, supply of power supply power to each part of the apparatus
is started. The CPU 28 reads out and executes an initial setting program stored in the memory
29. At this time, the CPU 28 controls the RF circuit 20b of the voice generation circuit 20 to set
to receive the initially set reception frequency. Then, the following processing is performed. Step
S10: The CPU 28 refers to the signal from the connection terminal 25 and determines whether or
not the headphone 27 is connected. If it is connected, the process proceeds to step S12.
Otherwise, the step S11 is performed. Go to Step S11: The CPU 28 uses the amplifier 23 for
amplification of the audio signal. That is, the CPU 28 maintains the state when the sound is
currently output from the built-in speaker 26, and when the sound is output from the headphone
27, the headphone 27 is removed. The output control circuit 22 is controlled to supply the
output of the volume control circuit 21 to the amplifier 23, and the switching circuit 30 is
controlled to supply power to the amplifier 23. Step S12: The CPU 28 refers to the output of the
MODEM circuit 20c of the voice generation circuit 20 and determines whether voice is being
output. As a result, if the voice is being output, the process proceeds to step S15, and otherwise,
the process proceeds to step S13. Step S 13: The CPU 28 acquires information indicating
“volume of headphones” from the memory 29, and sets the output of the volume control
circuit 21 to be this volume. Step S14: Next, the CPU 28 uses the amplifier 24 for amplification of
the audio signal.
That is, the CPU 28 controls the output control circuit 22 to supply the output of the volume
control circuit 21 to the amplifier 24 and controls the switching circuit 30 to supply power to the
amplifier 24. Step S15: On the other hand, when it is determined in step S12 that audio is being
output, the CPU 28 mutes the audio signal. That is, the CPU 28 controls the volume control
circuit 21 to minimize the level of the audio signal. Step S16: Next, the CPU 28 uses an amplifier
24 for amplification of the audio signal. That is, the CPU 28 controls the output control circuit 22
to supply the output of the volume control circuit 21 to the amplifier 24 and controls the
switching circuit 30 to supply power to the amplifier 24. Step S17: Next, the CPU 28 executes a
process to fade in the audio signal. That is, the CPU 28 controls the volume control circuit 21 to
execute a process of gradually increasing the level of the audio signal. The details of this process
will be described later with reference to FIG. FIG. 5 is a flowchart for explaining the details of the
“fade in process” shown in FIG. When this flowchart is started, the following steps are
performed. The fade-in process may be performed by another method. Step S30: The CPU 28 sets
a timer. That is, the CPU 28 acquires the “timer set value” (see FIG. 3) stored in the memory
29, and sets the timer value for the timer interrupt program. The timer interrupt program is a
program that counts down the timer setting value and generates a software interrupt when the
count value becomes "0". Step S31: Next, the CPU 28 starts a timer. That is, the CPU 28 starts the
counting operation of the timer program in which the timer setting value is set. Step S 32: The
CPU 28 detects whether or not an interrupt from the timer program has occurred, and
determines whether the timer has stopped. If the timer has stopped, the process proceeds to step
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S 33, otherwise If so, repeat the same process. Step S33: The CPU 28 acquires the “volume
increase value” (see FIG. 3) stored in the memory 29, and increases the volume of the volume
control circuit 21 by an amount according to this value.
Step S 34: The CPU 28 acquires information (see FIG. 3) indicating “volume of headphones”
stored in the memory 29, compares this information with the volume of the volume control
circuit 21, and these are equal. If equal, the process returns to the original process. Otherwise,
the process returns to step S30 to repeat the same process. According to the processes shown in
FIGS. 4 and 5, when the headphones 27 are connected when no sound is output, the volume
setting for the headphones 27 is made, and the output control circuit 22 is switched. After that,
the supply of power to the amplifier 24 is started, so that it is possible to prevent the pop noise
that is generated with the switching operation of the output control circuit 22 from being output.
When the headphones 27 are connected while audio is being output, the volume is reduced to
the minimum, and switching of the output of the output control circuit 22 and switching of the
amplifier by the switching circuit 30 are performed. Once done, the volume is gradually
increased (i.e. faded in) until the volume set for the headphones is reached. As a result, with the
volume set for the built-in speaker 26, the sound is output from the headphones 27, so that it is
possible to prevent the burden on the ear. In addition, since the power supply power is supplied
to the amplifier 24 after the output control circuit 22 is switched, generation of pop noise can be
prevented. If a direct current component is superimposed on the output of the audio generation
circuit 20 and if the volume is rapidly increased, pop noise may occur due to the direct current
component, but in the present embodiment, the volume Since it is made to increase gradually,
generation | occurrence | production of pop noise can be prevented. Next, processing in the case
of starting and the end of voice output will be described. In the transmitting and receiving
apparatus of the present embodiment, voice information is often exchanged with the other party
of communication by alternately executing the transmitting operation and the receiving
operation. For this reason, reception may be started during transmission and audio output may
be started, or transmission may be started during reception and audio output may be stopped. In
this embodiment, even in such a case, the pop noise is prevented from being output from the
headphones 27, and it is also prevented that the loud sound is rapidly output from the
headphones 27 and a burden is placed on the ear. Can. The details of the operation will be
described below with reference to the flowcharts shown in FIGS.
First, the case of starting reception during transmission or while waiting will be described with
reference to the flowchart shown in FIG. Step S50: When detecting that the operation to receive
the radio wave of the predetermined channel is performed during transmission or standby, the
CPU 28 determines whether to start the output of the sound and starts the output of the sound. If
yes, the process proceeds to step S51; otherwise, the process ends. Specifically, for example,
when an operation unit (not shown) is operated and a request to start reception is made, the CPU
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28 proceeds to step S51, and ends the process otherwise. Step S 51: The CPU 28 refers to the
output of the connection terminal 25 to determine whether the headphone 27 is connected or
not. If it is connected, the process proceeds to step S 54, otherwise The process proceeds to step
S52. Step S52: When the headphones 27 are not connected, the CPU 28 performs setting to use
the amplifier 23 for amplification of the audio signal. That is, the CPU 28 controls the output
control circuit 22 to set the output of the volume control circuit 21 to be supplied to the
amplifier 23 and controls the switching circuit 30 to supply power to the amplifier 23. Do. Step
S53: Next, the CPU 28 starts output of sound. That is, the CPU 28 acquires information (see FIG.
3) indicating “volume of the built-in speaker” stored in the memory 29 and sets the volume
control circuit 21 based on the information to obtain information on the built-in speaker 26. Start
audio output. Step S 54: On the other hand, when the headphones 27 are connected, the CPU 28
mutes the audio signal. That is, the CPU 28 controls the volume control circuit 21 to set the
volume to the minimum. Step S55: Next, the CPU 28 performs setting to use the amplifier 24 for
amplification of the audio signal. That is, the CPU 28 controls the output control circuit 22 to set
the output of the volume control circuit 21 to the amplifier 24 and controls the switching circuit
30 to supply power to the amplifier 24. Do. Step S 56: After that, the CPU 28 executes “fade in
processing” to gradually increase the volume to “volume of headphones” stored in the
memory 29. The “fade-in process” is the same as in the case of FIG. 5, so the detailed
description thereof will be omitted.
According to the above process, the sound output from the headphones 27 is controlled so as to
gradually increase from the minimum volume and reach the desired volume, so a large sound is
suddenly reproduced and can be heard on the ear. The burden can be prevented. In addition,
since the power is supplied to the amplifier 24 after the output control circuit 22 is switched, the
generation of pop noise can be prevented. Next, the case where transmission is started during
reception or the case where reception is stopped during reception will be described with
reference to FIG. Step S60: The CPU 28 determines whether or not to stop voice output, for
example, when a request to start transmission is made or a request to stop reception is made
during reception, If the output of voice is to be stopped, the process proceeds to step S61, and if
not, the process ends. Specifically, for example, when an operation unit (not shown) is operated
and a request for ending the reception is made, the CPU 28 proceeds to step S61, and ends the
process in other cases. Step S 61: When stopping the output of sound, the CPU 28 refers to the
signal from the connection terminal 25 and determines whether or not the headphone 27 is in
connection. Then, the CPU 28 proceeds to step S63 when the headphones 27 are connected, and
otherwise proceeds to step S62. Step S62: If the headphones 27 are not connected, the CPU 28
executes a process of stopping the output of sound. That is, the CPU 28 controls the volume
control circuit 21 to set the volume to the minimum, and controls the switching control circuit 30
to stop the supply of the power source power to the amplifier 23. As a result, the output of the
sound from the built-in speaker 26 is stopped. Step S63: The CPU 28 executes “fade out
processing” to gradually change from the currently set volume to the minimum volume. The
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details of this process will be described later with reference to FIG. Next, the details of the “fade
out process” shown in FIG. 7 will be described with reference to FIG. When this flowchart is
started, the following steps are performed. The fade-out process may be performed by another
method. Step S70: The CPU 28 sets a timer. That is, the CPU 28 acquires the “timer set value”
(see FIG. 3) stored in the memory 29, and sets the timer value for the timer interrupt program.
【0075】 ステップS71:CPU28は、タイマをスタートさせる。 That is, the CPU 28
starts the counting operation of the timer program in which the timer setting value is set. Step S
72: The CPU 28 detects whether or not an interrupt from the timer program has occurred to
determine whether the timer has stopped. If the timer has stopped, the process proceeds to step
S 73, otherwise If so, repeat the same process. Step S 73: The CPU 28 obtains the “volume
decrease value” (see FIG. 3) stored in the memory 29, and reduces the volume by controlling
the volume control circuit 21 by an amount according to this value. Let Step S 74: The CPU 28
determines whether or not the volume of the volume control circuit 21 has become minimum,
and returns to the original processing if it becomes the minimum, otherwise returns to step S 70.
The same process is repeated. As described above, according to the processes shown in FIG. 7
and FIG. 8, when the headphones 27 are connected, fade-in processing is executed when audio
output is started, and audio output is also performed. Since the fade-out process is performed
when stopping the sound, it is possible to prevent the burden on the ear from being caused by
the sound output from the headphones becoming louder or louder rapidly. Also, by gradually
changing the volume, it is possible to prevent the occurrence of pop noise. FIG. 9 is a diagram
showing the level of the audio signal supplied to the headphones 27. As shown in FIG. In this
figure, FIG. 9 (a) is a diagram showing a change in the level of the conventional audio signal, and
FIG. 9 (b) is a diagram showing a change in the level of the audio signal in the present invention.
As shown in this figure, in the case of the present invention, the maximum level of speech is
reduced from V1 to V2 as compared with the prior art. In addition, the rise and fall of the
envelope of the audio signal at the time when the output starts and ends are slower than in the
prior art. In this way, by making the rising or falling of the audio signal gentler, the occurrence of
pop noise generated in these parts is mitigated, and the ear is affected by the sudden rise or fall
of the volume. The burden can be reduced. Next, the operation in the priority scan operation will
be described. The transmission / reception apparatus of the present embodiment sets a channel
with high priority in advance, scans the channel at predetermined time intervals, and when there
is a reception signal, starts reception of the channel. In other cases, it has a so-called priority scan
function of continuously receiving a channel that has been received until then.
In such a priority scan operation, pop noise occurs when the reception channel is switched
because the priority channel is received by interrupting at a predetermined cycle while a
predetermined channel is being received. There is. In the present embodiment, it is possible to
suppress the output of pop noise from the headphones 27 even in the priority scan. The flow of
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processing at the time of the priority scan operation will be described below with reference to
FIGS. The priority channel is assumed to be stored in advance in the memory 29, as shown in FIG.
First, the flow of processing at the time of the priority scan operation will be described with
reference to FIG. Step S90: When a priority scan operation is requested, the CPU 28 acquires the
“priority scan timer set value” (see FIG. 3) stored in the memory 29, and sets a timer program.
Step S91: Next, the CPU 28 starts a timer program. As a result, when the time set in the priority
scan timer setting value has elapsed since the timer program was started, an interrupt is
generated. Step S 92: Then, the CPU 28 determines whether the timer has stopped. That is, when
an interrupt occurs from the timer program, the CPU 28 determines that the timer has stopped
and proceeds to step S93, and otherwise repeats the same process. Step S93: The CPU executes
“audio output stop processing” which is processing for stopping the output of audio. The
details of this process will be described later with reference to FIG. Step S 94: The CPU 28 checks
the reception state of the priority channel. That is, the CPU 28 acquires information indicating
the "priority channel" from the memory 29, and sets the reception channel of the RF circuit 20b.
Then, the CPU 28 refers to the output from the MODEM circuit 20c to check the reception state
of the priority channel. Step S95: The CPU 28 determines whether or not the priority channel can
be received. That is, the CPU 28 refers to the output of the MODEM circuit 20c, proceeds to step
S96 if there is a received signal, and proceeds to step S98 otherwise.
Step S96: If the priority channel can be received, the CPU sets the reception frequency of the RF
circuit 20b to the frequency of the priority channel. Step S97: Next, the CPU executes “audio
output start processing” which is processing to start output of audio. The details of this process
will be described later with reference to FIG. Step S 98: On the other hand, when the priority
channel can not be received, the CPU 28 sets the reception frequency of the RF circuit 20 b to
the frequency of the previous channel (the channel which has been received so far). Step S 99:
Next, the CPU 28 executes “audio output start processing” which is processing to start audio
output. The details of this process will be described later with reference to FIG. Step S100: The
CPU determines whether or not to end the priority scan operation, and returns to step S90 to
repeat the same operation if not ended, and ends the processing otherwise. Next, the details of
the “audio output stop process” shown in FIG. 10 will be described with reference to FIG.
When this flowchart is started, the following steps are performed. Step S120: The CPU 28 refers
to the signal from the connection terminal 25 to determine whether or not the headphones 27
are connected. If the headphones 27 are connected, the process proceeds to step S122, otherwise
In the case of, the process proceeds to step S121. Step S121: When the headphones 27 are not
connected, the CPU 28 controls the volume control circuit 21 to set the volume to the minimum,
and returns to the original processing. As a result, the output of the sound from the built-in
speaker 26 is stopped. Step S122: When the headphones 27 are connected, the CPU executes the
fade-out process shown in FIG. 8 and returns to the original process. As a result, the volume of
the sound output from the headphones 27 gradually decreases to the minimum volume. Next, the
details of the “voice output start process” shown in FIG. 10 will be described with reference to
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FIG. When this flowchart is started, the following steps are performed. Step S140: The CPU 28
refers to the signal from the connection terminal 25 to determine whether or not the headphone
27 is connected. If the headphone 27 is connected, the process proceeds to step S143, otherwise
In the case of, the process proceeds to step S141.
Step S141: When the headphone 27 is not connected, the CPU 28 performs setting to use the
amplifier 23 for amplification of the audio signal. That is, the CPU 28 controls the output control
circuit 22 to supply the output of the volume control circuit 21 to the amplifier 23 and controls
the switching circuit 30 to supply power to the amplifier 23. Step S142: Next, the CPU 28 starts
output of sound. That is, the CPU 28 acquires information (see FIG. 3) indicating “volume of the
built-in speaker” stored in the memory 29 and sets the volume control circuit 21 based on the
information to obtain information on the built-in speaker 26. Start audio output. Step S143: On
the other hand, when the headphones 27 are connected, the CPU mutes the audio signal. That is,
the CPU 28 controls the volume control circuit 21 to set the volume to the minimum. Step S144:
Next, the CPU 28 performs setting to use the amplifier 24 for amplification of the audio signal.
That is, the CPU 28 controls the output control circuit 22 to supply the output of the volume
control circuit 21 to the amplifier 24 and controls the switching circuit 30 to supply power to the
amplifier 24. Step S145: Then, the CPU 28 executes the “fade in process” shown in FIG. As a
result, the volume gradually increases from the minimum volume to the optimum volume for the
headphones 27. As described above, according to the processing shown in FIGS. 10 to 12, in the
case where the priority scan is executed and the headphones 27 are connected, the volume is
reduced by the fade-out processing. As a result, it is possible to prevent pop noise from being
generated when the receiving channel is switched. In addition, when the scan is completed and
the headphones 27 are connected, the fade-in occurs when the reproduction of the original
channel is resumed or when the reproduction of the priority channel is started. Since the volume
is gradually increased by the process and set to the optimal volume for the headphones 27, pop
noise and sudden increase in volume can be prevented, and the burden on the ear can be
reduced. it can. Next, a second embodiment of the present invention will be described. FIG. 13 is
a diagram showing a configuration example of the second embodiment of the present invention.
In addition, in this figure, since the same code | symbol is attached | subjected to the part
corresponding to the case of FIG. 1, the description is abbreviate | omitted. However, the
program executed by the CPU 28 is modified to realize the following functions. In the second
embodiment, in comparison with the first embodiment, the connection terminal 25 is excluded
and the changeover switch 50 is newly added. The other configuration is the same as that of the
first embodiment. Here, the changeover switch 50 corresponding to the selection means is a
switch provided as an operation unit in the housing of the transmitting and receiving apparatus,
and selects an audio output destination from any one of the built-in speaker 26 and the
headphones 27. It is possible to do. The CPU 28 detects the state of the changeover switch 50,
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and when the built-in speaker 26 is selected, controls the output control circuit 22 and the
switching circuit 30 so that the audio output destination becomes the built-in speaker 26. In
addition to setting, the volume control circuit 21 is controlled to set the volume to be optimum
for the built-in speaker 26. When the headphone 27 is selected, the output control circuit 22 and
the switching circuit 30 are controlled to set the audio output destination to be the headphone
27 and the volume control circuit 21 is controlled to control the headphone Set to an optimal
volume for 27. Although the connection terminal 25 is excluded in the second embodiment, the
connection terminal is provided in order to make the headphone 27 detachable as in the first
embodiment. You may Even in that case, the CPU 28 determines whether the output destination
is the built-in speaker 26 or the headphone 27 with reference to the output of the changeover
switch 50, so that the connection terminal indicates whether the headphone 27 is connected or
not. It is not necessary to have the ability to perform detection. Next, the operation of the second
embodiment of the present invention will be described. In the second embodiment of the present
invention, as compared with the first embodiment, the method of determining whether the
headphone 27 is connected is performed by referring to the output of the connection terminal
25. , Has been changed to the method performed with reference to the state of the changeover
switch 50. Therefore, in the first embodiment of the present invention described above, the
process of referring to the state of connection terminal 25 may be changed to refer to the state
of changeover switch 50 as in the first embodiment described above. Function can be realized.
The other operations are the same as in the first embodiment, and thus the description thereof is
omitted. As described above, according to the second embodiment, as in the first embodiment,
pop noise is output from the headphones 27 when the changeover switch 50 is switched. In
addition to the prevention, the sound output from the headphones 27 can be prevented from
being burdened to the ear by being rapidly increased or decreased rapidly. Although the
embodiment of the present invention has been described above, the present invention can be
variously modified in addition to this. For example, in each of the above embodiments, the
volume after switching the output destination of the sound is fixed (“volume of built-in
speaker” or “volume of headphones”). The configuration may be changed arbitrarily by
operating the unit. FIG. 14 is a view showing an example of the relationship (volume curve)
between the operation amount of the operation unit and the volume when the volume can be
changed by operating the operation unit. In this figure, "reference setting" indicates an operation
amount as a reference which is set after the audio output destination is switched. That is, when
the output destination of the sound is switched from the built-in speaker 26 to the headphone
27, the reference set value P2 for the headphone 27 (a set value corresponding to "volume of
headphone" shown in FIG. 3) is selected. Be done. Then, when the operation unit is operated, the
volume is adjusted along the adjustment curve C2 for the headphones 27. On the other hand,
when the audio output destination is switched from the headphone 27 to the built-in speaker 26,
the reference set value P1 for the built-in speaker 26 (a set value corresponding to "volume of
built-in speaker" shown in FIG. 3) is selected. Ru. Then, when the operation unit is operated, the
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volume is adjusted along the adjustment curve C1 for the built-in speaker 26. According to such
an embodiment, it is possible to freely change the volume based on the reference set values P1
and P2. Therefore, it is possible to select the optimal volume according to the use environment
and the like. It is possible to further reduce the burden on the ear. By changing “volume of builtin speaker” and “volume of headphones” stored in the memory 29, it is possible to freely set
the reference set value shown in FIG.
According to such a configuration, it is possible to make an optimal setting according to the use
environment and the user's hearing, so it is possible to further reduce the burden on the ear. In
each of the above embodiments, the built-in speaker 26 as the first sound output means is built
in the housing, but instead, the speaker may be provided outside the housing. Good. In addition,
as the second sound output means, although the headphone 27 has been described as an
example, it is also possible to use, for example, an earphone. Further, as the control means, the
CPU 28 realizes necessary functions in accordance with the program stored in the memory 29,
but all functions can also be realized by hardware. Although the connection terminal 25 has been
described as an example of the detection means, a detection circuit for detecting a change in the
electric resistance of the connection terminal 25 is separately provided to detect that the
headphone 27 is connected. You may In addition, although the changeover switch 50 has been
described as an example of the selection means, for example, a display unit having a touch panel
is provided, and a GUI (Graphical User Interface) displayed on the display unit is operated. In this
case, the output destination may be switched. Although the case of receiving an audio signal has
been described as an example of the receiving means, it is needless to say that the present
invention can be applied to the case of receiving a signal other than an audio signal.
Furthermore, the output audio signal is not limited to the received audio signal, and may be an
audio signal reproduced from various recording media. According to the present invention, it is
possible to reduce the burden on the ear by the sound output from the headphone or the like.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a configuration
example of a first embodiment of the present invention. FIG. 2 is a block diagram showing a
detailed configuration example of an audio generation circuit of the transmitting and receiving
apparatus shown in FIG. 1; 3 is a view showing an example of data stored in a memory of the
transmission / reception apparatus shown in FIG. 1; 4 is a flowchart illustrating an example of
processing executed when headphones are connected to the transmitting and receiving device
illustrated in FIG. 1; FIG. 5 is a flowchart for explaining the details of the “fade in process”
shown in FIG. 4; 6 (a) is a diagram showing changes in the level of the audio signal in the prior
art, and FIG. 6 (b) shows changes in the level of the audio signal in the first embodiment shown
in FIG. FIG.
FIG. 7 is a flow chart for explaining the flow of processing in the case where reception is started
during transmission or during standby in the first embodiment shown in FIG. 1; FIG. 8 is a flow
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chart for explaining the flow of processing when transmission is started during reception or is
stopped during reception in the first embodiment shown in FIG. 1; FIG. 9 is a flowchart for
describing the details of the “fade in process” shown in FIG. 8; FIG. 10 is a flow chart for
explaining a process performed in the priority scan in the first embodiment shown in FIG. 1; 11 is
a flowchart for explaining the details of the “audio output stop process” shown in FIG. 10; 12
is a flowchart for explaining the details of the “voice output start process” shown in FIG. 10;
FIG. 13 is a block diagram showing a configuration example of a second embodiment of the
present invention. FIG. 14 is a diagram showing an example of the relationship between the
operation amount and the sound volume when the operation unit (not shown) is operated in the
embodiment shown in FIG. 1 or 13; Description of symbols 20 sound generation circuit
(reception means) 21 volume control circuit (sound control means) 22 output control circuit
(output control means) 25 connection terminal (connection terminal) 26 built-in speaker (first
sound output means) 27 Headphones (second audio output means) 28 CPU (control means) 50
Selector switch (selection means)
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