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JP2006229545

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DESCRIPTION JP2006229545
An audio device plug connected to a jack interface of an IT terminal including a jack interface
common to headphones, an earphone microphone and a stereo microphone is identified and
automatically set up properly. SOLUTION: The jack interface 10 to which an audio device plug 70
can be connected is connected to an audio codec 50 via an input / output selector circuit 42, and
an R to V conversion circuit is connected to a LEFT signal and a RIGHT signal terminal of the jack
interface 10. 20 are connected, and the output voltages V-LEFT 201 and V-RIGHT 202 are
compared with the reference voltage 301 by the comparison circuits 31 and 32, and the input /
output selector circuit 42 and the control units 41 and 51 of the audio codec 50 are compared.
Control. [Selected figure] Figure 1
IT terminal and audio device identification method therefor
[0001]
The present invention relates to an IT terminal, and more particularly to a portable IT terminal
having an audio function and an audio device identification method connected to a jack interface
common to plural types of audio devices.
[0002]
With advances in elemental technologies such as communication technology and semiconductor
technology, small-sized high-performance portable information technology (IT) terminals such as
laptop personal computers (PCs) and PDAs (Personal Digital Assistants) have been developed and
rapidly spread. There is.
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By using such an IT terminal, the user can easily read out and use information such as various
data stored in the internal memory, and a computer or the like installed in an office or home via a
wireless communication circuit. It can be used by reading out and downloading various
information, for example, desired music data via the Internet or the like. IT terminals
incorporating such audio functions are becoming widespread.
[0003]
For example, in a notebook PC, since its physical size is relatively large, it can be equipped with
various audio plugs such as headphones, microphones and line-ins, and can be equipped with a
plurality of jack interfaces according to this and circuits corresponding thereto. However, in
portable IT terminals such as PDAs, which are smaller than notebook PCs, it is common to mount
only a single interface such as headphones or an earphone microphone due to severe physical
constraints.
[0004]
The related art related to or related to such an IT terminal is disclosed in some technical
documents. There is disclosed an audio signal processing apparatus and a mobile telephone
which are provided with stereo headphones and a microphone and are distinguished to
correspond to stereo audio processing (see, for example, Patent Document 1). Also disclosed is a
signal system switching method and apparatus of a mobile telephone device provided with a plug
detector for detecting whether the plug attached to the earphone microphone jack terminal is the
earphone microphone plug or the stereo headphone plug. (For example, refer patent document
2).
[0005]
Also, there is disclosed an input / output circuit of an audio device which is provided as a
connection jack of a headphone and a connection jack of a microphone and which is identified
and switched for use (see, for example, Patent Document 3). Furthermore, in an audio device
such as a tape recorder, a signal input / output circuit of an audio device is disclosed that
achieves miniaturization of the device by sharing the jack for connection of stereo headphones
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and the jack for connection of monaural microphones with one connection jack. (See, for
example, Patent Document 4).
[0006]
JP-A-2002-101491 (page 3, FIG. 1) JP-A-2002-141980 (page 3-4, FIG. 1) JP-A-8-163686 (pages
3-4, 1) Figure) JP-A-9-307990 (page 2-3, FIG. 1)
[0007]
As described above, the conventional portable IT terminal (notebook PC, PDA, etc.) is equipped
with a jack interface for connecting an external headphone or microphone, and the notebook PC
has a physically sufficient size. It is possible to mount a plurality of jack interfaces and their
circuits according to various audio devices such as headphones and microphones.
However, in PDAs, etc., which are more miniaturized portable IT terminals, it is physically
difficult to mount a plurality of jack interfaces, and in general, only a single function and one jack
interface such as a headphone or an earphone microphone is generally used. It is mounted.
[0008]
On the other hand, with the advancement of multimedia functions and solution systems even for
small portable IT terminals, there is a need to adapt to various audio devices such as headphones,
earphone microphones and stereo microphones. Therefore, while maintaining the miniaturization
of the portable IT terminal, appropriate speaker volume and microphone gain settings are set for
the multi-function jack interface compatible with various audio devices and their circuits and the
types of connected audio devices. Although it is necessary to provide software to be applied, the
prior art has a problem that it can not sufficiently cope with these needs.
[0009]
The present invention has been made in view of the above-described problems of the prior art,
and it is a main object of the present invention to provide an IT terminal and an audio device
identification method for solving or reducing such problems.
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[0010]
In order to solve the above-mentioned problems, the IT terminal and the audio device
identification method according to the present invention adopt the following characteristic
configuration.
[0011]
(1) In an IT terminal incorporating an audio function including a common jack interface to which
plural types of audio devices are connected, an input / output selector circuit connected to the
jack interface, and an audio codec connected to the input / output selector circuit A conversion
circuit connected to the LEFT signal and the RIGHT signal path between the jack interface and
the input / output selector circuit, for converting the impedance of an audio device plug
connected to the jack interface into a voltage, and the output voltage of the conversion circuit An
IT terminal comprising a comparison circuit for comparing with a voltage, and controlling the
control unit of the input / output selector circuit and the audio codec based on the comparison
output of the comparison circuit.
(2) The audio codec further includes a CPU connected to the control unit of the audio codec, and
the CPU performs appropriate processing according to the type of the identified audio device
based on an interrupt signal from the control unit (1 ) IT terminal.
(3) The comparison circuit compares the V-LEFT voltage and the V-RIGHT voltage from the R →
V conversion circuit with the reference voltage and outputs a logic signal of “High” or
“Low”. The IT terminal according to the above (1) or (2), configured by the comparison circuit
of (4) The IT terminal according to any one of (1) to (3), wherein a headphone, an earphone
microphone, or a stereo microphone is connected to the jack interface. (5) An audio device
identification method for identifying the type of audio device connected to the jack interface of a
portable IT terminal incorporating an audio function including a jack interface common to a
plurality of types of audio devices Obtaining V-LEFT and V-RIGHT voltages proportional to the
resistance (impedance) of the LEFT and RIGHT channels of the audio equipment plug connected
to the and comparing the V-LEFT and V-RIGHT voltages to a reference voltage And determining
the type of the audio device connected to the jack interface based on a combination of the
comparison results. (6) The IT terminal according to (5), including the step of interrupting the
CPU in the IT terminal based on the discrimination result of the audio device and setting a
speaker volume and a microphone gain according to the identified audio device. Audio device
identification method. (7) A method of identifying audio equipment of an IT terminal for
identifying three types of headphones, an earphone microphone and a stereo microphone
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connected to the jack interface of a portable IT terminal incorporating an audio function
including a single jack interface, The conversion step of converting the impedances of the LEFT
channel and the RIGHT channel connected to the jack interface into corresponding voltages, and
IT automatically identifying the headphone, earphone microphone or stereo microphone based
on both voltages obtained by the conversion step. Audio device identification method of terminal.
(8) The method according to (7), wherein the method converts the two voltages converted in the
conversion step into a logic signal and obtains a combination of the logic signals.
[0012]
According to the IT terminal of the present invention, the audio device identification method and
the input / output switching circuit thereof, the following practical outstanding effects can be
obtained. That is, it becomes possible to apply to a plurality of types of audio devices such as
headphones, earphone microphones, stereo microphones, etc. with a common single jack
interface, and even a miniaturized IT terminal is sufficient without losing physical size. Can
provide various audio functions. In addition, it is possible to automatically set the type
determination after connecting the audio device and the speaker volume and the microphone
gain which are optimal for each audio device. Therefore, it is not necessary for the user to
perform the switching operation, and further, connection errors in the jack interface can be
eliminated. According to the present invention, a plurality of types of audio devices such as
headphones, earphone microphones and stereo microphones connected to an audio jack
interface are automatically identified by one jack interface, and an input / output circuit suitable
for each audio device Enables switching of software operation.
[0013]
The configuration and operation of a preferred embodiment of an IT terminal, an audio device
identification method and an input / output switching circuit according to the present invention
will be described in detail with reference to the attached drawings.
[0014]
First, FIG. 1 is a functional block diagram showing a configuration of a preferred embodiment of
an IT terminal (or portable IT terminal) according to the present invention.
This IT terminal is an audio CODEC including a jack interface 10, an R → V (resistance or
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impedance → voltage) conversion circuit 20, a pair of comparison circuits 31 and 32, a control
unit 41, an input / output selector circuit 42, and a control unit 51. A codec 50 and a CPU
(central processing unit) 60 are provided.
[0015]
In this IT terminal, the jack interface 10 is connected to the plug of the audio device. The R → V
conversion circuit 20 converts into a voltage value based on the impedance characteristics of the
LEFT (left) channel (hereinafter referred to as L-CH) signal 102 and the RIGHT (right) channel
(hereinafter referred to as R-CH) signal 103. The first comparison circuit (or comparison circuit)
31 compares the L-CH voltage value V-LEFT 201 converted by the R → V conversion circuit 20
with the reference voltage. On the other hand, the second comparison circuit (or comparison
circuit) 32 compares the R-CH voltage value V-RIGHT 202 converted by the R → V conversion
circuit 20 with the reference voltage. The input / output selector circuit 42 receives the outputs
311 and 312 of the first comparison circuit 31 and the second comparison circuit 32 in the
control unit 41. The control unit 41 also receives the plug recognition signal 101 of the jack
interface 10. The input / output selector circuit 42 connects each input / output signal of the
audio codec 50 to the LEFT signal 102 and the RIGHT signal 103 of the jack interface 10. The
control unit of the audio codec 50 outputs an interrupt signal 601 to the CPU 60 to perform
interrupt processing. The CPU 60 sets input / output values (for example, the output volume of
the speaker is the input gain of the microphone) suitable for the type of the identified audio
device.
[0016]
By the way, the plug of the audio device is generally a 3-pole type, and L-CH, R-CH and GND (or
ground) are wired to the plug connected to the jack interface 10, respectively. The headphone is
a speaker output for both L / R-CH signals, the earphone microphone is a microphone input for
the L-CH signal, the R-CH signal is a speaker output, and the stereo microphone is a microphone
input for both L / R-CH signals.
[0017]
Next, the operation of the IT terminal shown in FIG. 1 will be described. When the plug of the
audio device is connected to the jack interface 10 of the IT terminal equipped with the functions
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and circuits shown in FIG. 1, the LEFT signal 102 and the RIGHT signal 103 of the jack interface
are audio devices as shown in FIGS. Are converted into voltage values of V-LEFT 201 and VRIGHT 202 by the impedance characteristic of the function (microphone or speaker) of each pin
of the plug.
[0018]
FIG. 2 is an explanatory view showing a part of the IT terminal of FIG. 1 and a state in which an
audio device plug 70 is connected to the jack interface 10 thereof. Also, FIG. 3 is based on the
values of L-CH resistance (or impedance) R1 and R-CH resistance R2 when the audio plug 70
connected to the jack interface 10 is a headphone, an earphone microphone and a stereo
microphone, and 5 is an explanatory view showing values of V-LEFT 201 and V-RIGHT 202
which are voltages converted by the R → V conversion circuit 20. FIG.
[0019]
As shown in FIG. 3, in the case of the headphones described in the left column, since the L-CH
resistance R1 which is a speaker function is small, the V-LEFT 201 is small and the R-CH
resistance R2 and V-RIGHT 202 which are also speaker functions. Too small. On the other hand,
in the case of the earphone microphone described in the middle column, the L-CH resistance R1
as the microphone function is large and the V-LEFT 201 is large, but the R-CH resistance R2 as
the speaker function is small and the V-RIGHT 202 is also small. . On the other hand, in the case
of the stereo microphone described in the right column, the L-CH resistance R1 which is the
microphone function is large, the V-LEFT 201 is also large, the R-CH resistance R2 which is the
microphone function is also large, and the V-RIGHT 202 is also large. .
[0020]
V-LEFT 201 and V-RIGHT 202 as shown in FIG. 3 are input to the non-inversion input terminals
of the first comparison circuit 31 and the second comparison circuit 32 as shown in FIG. Is
compared with the voltage value of Hereinafter, the comparison operation of the first comparison
circuit 31 and the second comparison circuit 32 will be described based on the flowchart shown
in FIG.
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[0021]
First, V-LEFT 201 and V-RIGHT 202 output from the R → V conversion circuit 20 are input to the
first comparison circuit 31 and the second comparison circuit 32 (step S1). Next, the V-LEFT 201
and the V-RIGHT 202 are respectively compared with the reference voltage 301 in the first
comparison circuit 31 and the second comparison circuit 32 (step S2). When V-LEFT 201 and VRIGHT 202 are smaller than reference voltage 301, outputs 311 of first comparison circuit 31
and second comparison circuit 32 are "Low" (step S3). On the other hand, when V-LEFT 201 and
V-RIGHT 202 are larger than reference voltage 301, outputs 312 of first comparison circuit 31
and second comparison circuit 32 are "High" (step S4).
[0022]
Next, the combination of the output 311 of the first comparison circuit 31 and the output of the
output 312 from the second comparison circuit 32 is determined (step S5). When the output 201
of the first comparison circuit 31 is "High" and the output 202 of the second comparison circuit
32 is "Low", it is determined as an earphone microphone (step S6). On the other hand, when both
the output 201 of the first comparison circuit and the output 202 of the second comparison
circuit 32 are "Low", it is determined as a headphone (step S7). If both the output 201 of the first
comparison circuit 31 and the output 202 of the second comparison circuit 32 are "High", it is
determined as a stereo microphone (step S8). Thus, it is possible to determine whether the audio
device connected to the jack interface 10 is a headphone, an earphone microphone, or a stereo
microphone.
[0023]
Next, FIG. 6 is a detailed explanatory view showing a part of the jack interface 10, the input /
output selector circuit 42 of the audio signal, and the control unit 41 which controls the selector
circuit 42 in the IT terminal of FIG. The plug recognition signal 101, the output signal 311 of the
first comparison circuit 31, and the output signal 312 of the second comparison circuit 32 are
input to the control unit 41 in order to prevent circuit malfunction when the audio device is not
connected. There is.
[0024]
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As shown in FIG. 6, the input / output selector circuit 42 includes four switches of LEFT signal
output input switch SW-A421, SW-B422 and RIGHT signal output input switch SW-C423, SWD424. Therefore, the control unit 41 determines the type of the audio device connected to the
jack interface 10 by the combination of the output signals 311 and 312 of the first comparison
circuit 31 and the second comparison circuit 32, as shown in the flowchart of FIG. Based on the
above, the SW-A to SW-D 421, 422, 423, 424 of the input / output selector circuit 42 are
switched as shown in FIG. 6 to provide an appropriate path for the connected audio device.
[0025]
When determined as headphones, when SW-A 421 and SW-C 423 shown in FIG. 6 are
determined as earphone microphones, SW-B 422 and SW-C 423 shown in FIG. 6 are determined
as stereo microphones. In this case, SW-B 422 and SW-D 424 shown in FIG. 6 are in the ON state.
[0026]
As described above with reference to FIG. 6, the LEFT signal 102 and the RIGHT signal 103 to
the jack interface 10 are connected to an appropriate audio signal according to the type of audio
device connected to the jack interface 10.
[0027]
Furthermore, as shown in FIG. 7, the comparison output signal 311 of the first comparison
circuit 31 and the comparison output signal 312 of the second comparator 32 are input to the
control unit 51 of the audio codec 50 together with the plug recognition signal 101 from the jack
interface 10. Be done.
Then, when the audio device plug 70 is connected to the jack interface 10 of the IT terminal to
recognize that the audio device is in the connected state, the control unit 51 outputs an interrupt
signal 601 to the CPU 60 to perform an interrupt. Do the processing.
That is, when the CPU 60 receives the interrupt signal 601, it is connected to the jack interface
10 based on the comparison output signals 311 and 312 of the first comparison circuit 31 and
the second comparison circuit 32 input to the control unit 51 of the audio codec 50. The audio
device is identified and the operation is started with appropriate software settings (for example,
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output volume, input gain, etc.).
[0028]
The configuration and operation of the preferred embodiment of the IT terminal and its audio
device identification method according to the present invention have been described in detail.
However, it should be noted that such examples are merely illustrative of the present invention
and do not limit the present invention in any way. Those skilled in the art will readily understand
that various modifications and variations can be made according to a particular application
without departing from the spirit and scope of the present invention.
[0029]
For example, in the embodiment described above, the types of audio devices to be automatically
determined are headphones, earphone microphones and stereo microphones, but these are
representative audio devices and other audios having a microphone function and a speaker
function Even the device is adaptable. Also, the outputs of the first comparison circuit and the
second comparison circuit differ in the level of the output result depending on the inverting input
method and the non-inverting input method, but even in this case, the logic design corresponding
to the control unit of the selector circuit Does not affect the operation of the present invention.
[0030]
It is a functional block diagram showing composition of a preferred embodiment of an IT
terminal according to the present invention. It is explanatory drawing at the time of connecting
an audio apparatus plug to the jack interface of the IT terminal of FIG. It is explanatory drawing
which discriminate | determines whether the audio apparatus plug of FIG. 2 is a headphone, an
earphone microphone, or a stereo microphone. It is explanatory drawing discriminate |
determined by IT terminal of FIG. 1 based on the result of FIG. It is a flowchart explaining the
audio apparatus identification method of IT terminal by this invention. It is detail explanatory
drawing of the input-output selector circuit in FIG. It is operation | movement explanatory
drawing of the audio codec in FIG.
Explanation of sign
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[0031]
DESCRIPTION OF SYMBOLS 10 Jack interface 20 R-> V conversion circuit 31, 32 comparison
circuit 41, 51 control part 42 input-output selector circuit 50 audio codec 60 CPU 70 audio
apparatus plug
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