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JP2004120310

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DESCRIPTION JP2004120310
The present invention provides a compact microphone device. An audio signal generator 111 for
collecting audio to generate an analog audio signal, a signal terminal 122 to which a
synchronous clock signal is applied, and converting an analog audio signal into a digital audio
signal for synchronization An analog-to-digital converter 116 for outputting a digital audio signal
synchronized with a clock signal, and an amplitude modulator 117 for modulating the amplitude
of the synchronous clock signal applied to the signal terminal 122 with the digital audio signal.
[Selected figure] Figure 1
Microphone device
[0001] The present invention relates to a microphone device for collecting voice and outputting a
voice signal, an electronic device provided with the microphone device, and a voice signal
transmission method for transferring a voice signal. Conventionally, audio is collected to
generate an analog audio signal, the generated analog audio signal is amplified, and the amplified
analog audio signal is converted to a digital audio signal. And a microphone device that outputs a
digital audio signal to another device (see, for example, Patent Document 1). Also, as shown in
FIG. 7, the conventional microphone device 710 is generally connected to the audio signal
processing device 730 via the four terminals 721, 722, 723, 724, and together with the audio
signal processing device 730, is an electronic device. The device 700 was to be configured.
Specifically, power terminal 721 for microphone device 710 to receive supply of power supply
voltage from audio signal processing device 730, and synchronous clock signal for microphone
device 710 to receive supply of synchronous clock signal from audio signal processing device
730. A terminal 722, a ground terminal 723 for the microphone device 710 to share the ground
voltage with the audio signal processing device 730, and an audio signal terminal 724 for the
microphone device 710 to supply an audio signal to the audio signal processing device 730, As
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shown in FIG. 8, the microphone device 710 and the audio signal processing device 730 are
connected to each other via the four terminals 721, 722, 723, and 724 formed on the printed
circuit board 720. The operation of the electronic device 700 provided with such a conventional
microphone device 710 will be described with reference to FIG. The synchronous clock signal
generated by the synchronous clock signal generator 731 of the audio signal processing unit 730
is output to the microphone unit 710 via the signal terminal 734 of the audio signal processing
unit 730. In addition, the diaphragm 712 of the microphone device 710 is vibrated by the
acoustic vibration, and the capacitance of the capacitor configured by the diaphragm 712 and
the electrode plate 713 of the microphone device 710 is changed, and the capacitance is
generated by the change. The analog audio signal is amplified by the amplifier 715 of the
microphone device 710, and the amplified analog audio signal is output to the analog-to-digital
converter 716 of the microphone device 710. The analog-to-digital converter 716 of the
microphone device 710 converts the analog audio signal into a digital audio signal, and
synchronizes with the synchronous clock signal acquired via the synchronous clock signal
terminal 722 on the printed circuit board 720 so as to be digital. The audio signal is output to
the audio signal processing unit 730 via the audio signal terminal 724 on the printed circuit
board 720.
Therefore, the audio signal processing device 730 can acquire a digital audio signal synchronized
with the synchronous clock signal output from itself by the audio signal receiver 735 from the
microphone device 710. [Patent Document 1] Japanese Patent Application Laid-Open No. 62276998 (P. 1-2) However, such a conventional microphone device 710 as described above is as
described above. To the audio signal processor 730 via the four terminals 721, 722, 723 and
724, and when trying to miniaturize the microphone device 710, the four terminals themselves
have to be miniaturized. When trying to miniaturize each of the four terminals itself, it is difficult
to ensure electrical continuity with the respective terminals of the audio signal processing device
730, so there was a problem that it was difficult to miniaturize the microphone device 710 after
all . Further, in recent years, a small-sized microphone device is required, and in particular, in a
portable electronic device, it is required to further reduce the diameter of the microphone device.
The present invention has been made to solve such problems, and provides a microphone device,
an electronic device, and an audio signal transmission method that can be miniaturized. A
microphone device according to the present invention comprises an audio signal generator for
collecting audio to generate an analog audio signal, and converting the analog audio signal into a
digital audio signal. And an analog-to-digital converter that outputs the digital audio signal
synchronized with the synchronous clock signal input from the outside via the signal terminal,
and an amplitude modulator that modulates the amplitude of the synchronous clock signal with
the digital audio signal And a configuration comprising: According to this configuration, the
diameter can be made smaller than that of the conventional microphone device, and the
microphone device can be miniaturized. Also, in the microphone device of the present invention,
the amplitude modulator includes a resistor that divides a voltage of the synchronous clock
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signal, and a switch that switches connection and disconnection between the signal terminal and
the resistor. The switch is configured to be controlled by the analog-to-digital converter
according to the value of the digital audio signal. According to this configuration, the microphone
device can be miniaturized with a simple and inexpensive configuration.
In the microphone device according to the present invention, a diaphragm that is vibrated by
voice, an electrode plate that is disposed to face the diaphragm and that forms a capacitor with
the diaphragm, and the electrode plate And a printed circuit board disposed on the opposite side
of the diaphragm, and an integrated circuit disposed on the printed circuit board between the
printed circuit board and the electrode plate, the printed circuit board including the integrated
circuit It has a configuration in which three connection terminals are formed on the side opposite
to the arranged side. With this configuration, the diameter can be smaller than that of the
conventional microphone device, and the microphone device can be miniaturized. Further, in the
microphone device of the present invention, a power supply terminal to which a power supply
voltage is applied, a ground terminal to which a ground voltage is applied, and a signal terminal
to which a voltage of a synchronous clock signal is applied to the printed circuit board The
integrated circuit is configured to modulate the amplitude of the synchronous clock signal
applied to the signal terminal with an audio signal. According to this configuration, the
synchronous clock and the audio signal can be transmitted through the same terminal to make
the microphone device compact. In addition, the electronic device of the present invention
includes a microphone device that collects voice and generates a voice signal, and a voice signal
processing device that obtains the voice signal generated by the microphone device, The signal
processing device supplies a synchronous clock signal to the microphone device, and the
microphone device amplitude-modulates the synchronous clock signal with the audio signal, and
the microphone device and the audio signal processing device have the same terminal. , And
transmits the synchronous clock signal and the audio signal. According to this configuration, the
diameter can be made smaller than that of the conventional microphone device, and the
electronic device can be miniaturized. Further, in the electronic device according to the present
invention, the microphone device acquires the synchronous clock signal by detecting either
rising or falling of the voltage of the terminal, and the audio signal processing device detects the
synchronous clock signal. The audio signal is obtained by detecting either the falling or rising of
the voltage of the terminal. According to this configuration, the microphone device and the audio
signal processing device can easily acquire the synchronous clock signal and the audio signal,
respectively.
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 block diagram showing a
microphone device 110 and an electronic device 100 according to an embodiment of the present
invention. The electronic device 100 collects a voice and generates a voice signal, and a voice
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signal processing device that obtains a voice signal generated by the microphone device 110 and
performs coding and other voice signal processing And 130. First, the configuration of the
microphone device 110 will be described. The audio signal generator 111 is composed of a pair
of diaphragms 112 and an electrode plate 113, and collects audio to generate an analog audio
signal. The amplifier 115 is adapted to amplify the analog audio signal generated by the audio
signal generator 111. The analog-to-digital converter 116 converts an analog audio signal into a
digital audio signal, and outputs a digital audio signal in synchronization with a synchronous
clock signal applied to a signal terminal 122 described later. The analog-to-digital converter 116
detects the synchronous clock signal at the rise of the voltage of the synchronous clock signal.
The amplitude modulator 117 comprises a switch 118 and a resistor 119 connected in series,
and modulates the amplitude of the synchronous clock signal applied to the signal terminal 122
with the digital audio signal output from the analog-to-digital converter 116. It is supposed to be.
That is, the amplitude modulator 117 superimposes a digital audio signal on a clock signal and
outputs it to the signal terminal 122. The printed circuit board 120 has a power supply terminal
121 to which a power supply voltage is applied, a signal terminal 122 to which a voltage of a
synchronous clock signal is applied, and a ground terminal 123 to which a ground voltage is
applied. The amplifier 115, the analog-to-digital converter 116, and the amplitude modulator
117 constitute an integrated circuit 114. Specifically, in the amplitude modulator 117 of the
microphone device 110, the switch 118 corresponds to the value of the digital audio signal
output from the analog-to-digital converter 116 and the signal terminal 122 and the resistor
119. The connection and disconnection is switched, and the resistor 119 divides the voltage of
the synchronous clock signal applied to the signal terminal 122. More specifically, the resistor
119 has a resistance value equivalent to the resistor 132 of the audio signal processing device
130 described later, and the switch 118 receives one bit of digital audio signal from the analogto-digital converter 116. Each time the signal terminal 122 and the resistor 119 are connected
(hereinafter referred to as "on state") or the state where the signal terminal 122 and the resistor
119 are disconnected (hereinafter referred to as "off state"). When the switch 118 is on, the
voltage of the synchronous clock signal is divided in half by the resistor 119. When the switch
118 is off, the voltage of the synchronous clock signal applied from the audio signal processing
device 130 It is supposed to be maintained.
The switch 118 is turned on by inputting "0" information from the analog-to-digital converter
116, and the switch 118 is turned off by inputting "1" information from the analog-to-digital
converter 116. It has become. FIG. 2 shows an embodiment in which the amplitude modulator
117 of the microphone device 110 is composed of a transistor 118 a and a resistor 119. In FIG.
2, the transistor 118a has a base connected to the analog-to-digital converter 116, an emitter
connected to the signal terminal 122, a collector connected to the resistor 119, and a digital
audio signal from the analog-to-digital converter 116 The amplitude of the synchronous clock
signal is modulated by being in a state of passing or blocking the current flowing between the
resistor 119 and the signal terminal 122 every time one bit is input. . FIG. 3 is a cross-sectional
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view showing the structure of the microphone device 110 according to the present embodiment.
In FIG. 3, the same components as those shown in FIG. 1 are denoted by the same reference
numerals. The housing 350 accommodates the diaphragm 112, the electrode plate 113, the
integrated circuit 114, and the printed circuit board 120. The opening 351 is formed in the
housing 350 and allows sound to pass through the inside of the housing 350. The diaphragm
112 is connected to the integrated circuit 114 via the conductive diaphragm ring 353, the
housing 350, and the wiring on the printed circuit board 120. The electrode plate 113 is
disposed to face the diaphragm 112 with the insulating spacer 352 interposed therebetween,
and constitutes a capacitor with the diaphragm 112. Further, the electrode plate 113 is
connected to the integrated circuit 114 via the conductive gate 355 embedded in the insulating
fixer 354 and the wiring on the printed board 120. The printed circuit board 120 is disposed on
the opposite side of the electrode plate 113 to the diaphragm 112. The integrated circuit 114 is
disposed on the printed circuit board 120 between the printed circuit board 120 and the
electrode plate 113. In addition, as shown in FIG. 4, the printed circuit board 120 is provided on
the side opposite to the side on which the integrated circuit 114 is disposed, that is, the
connection side connected to the outside, as shown in FIG. And are formed. Next, the
configuration of the audio signal processing device 130 will be described. In FIG. 1, the
synchronous clock signal generator 131 is adapted to generate a synchronous clock signal with a
constant amplitude and a constant period.
The resistor 132 has a resistance value equivalent to the resistor 119 of the microphone device
110, one end is connected to the synchronous clock signal generator 131, and the other end is
connected to the signal terminal 134 of the audio signal processing device 130. ing. The audio
signal detector 133 is output from the analog-to-digital converter 116 of the microphone device
110 by detecting the synchronous clock signal at the detection point 140 connected to the signal
terminal 134 at the fall of the voltage of the synchronous clock signal. It is configured to detect
"1" information and "0" information of digital audio signals. FIG. 5 shows an example of the
synchronous clock signal. The synchronous clock signal 500 shown in FIG. 5A is amplitudemodulated by the amplitude modulator 117 of the microphone device 110. The synchronous
clock signal 510 of FIG. 5B is an enlarged view of a part of the synchronous clock signal 500 of
FIG. 5A. The synchronous clock signal 510 is modulated by the digital audio signal 520 shown in
FIG. 5 (c). Hereinafter, operations of the microphone device 110 and the electronic device 100
according to the present embodiment will be described. The synchronous clock signal generator
131 of the audio signal processing device 130 generates a synchronous clock signal with a
constant amplitude and a constant period. The generated synchronous clock signal is transmitted
to the microphone device 110 through the resistor 132 and the signal terminal 134 of the audio
signal processing device 130, and a voltage is applied to the signal terminal 122 on the printed
circuit board 120. Further, an audio signal generator 111 of the microphone device 110
generates an analog audio signal, and an amplifier 115 of the microphone device 110 amplifies
the analog audio signal. Furthermore, the synchronous clock signal supplied from the audio
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signal processing device 130 and the analog audio signal output from the amplifier 115 of the
microphone device 110 are input to the analog to digital converter 116 of the microphone device
110, The analog voice signal is converted to a digital voice signal by the digital converter 116,
and the digital voice signal is output to the amplitude modulator 117 in synchronization with the
synchronous clock signal. As shown in FIG. 6, each time the synchronous clock signal 600 is
detected at the rising point 620 of the synchronous clock signal 600, a digital audio signal is
output to the amplitude modulator 117 of the microphone device 110 bit by bit.
Here, when 0 information of the digital audio signal is input to the amplitude modulator 117
of the microphone device 110, the switch 118 of the amplitude modulator 117 is turned on, and
the amplitude of the microphone device 110 is When the digital audio signal 1 information
is input to the modulator 117, the switch 118 of the amplitude modulator 117 is turned off.
When the switch 118 of the amplitude modulator 117 is turned on, the signal terminal 122 of
the microphone device 110 and the resistor 119 of the amplitude modulator 117 are connected,
and the amplitude of the synchronous clock signal at the signal terminal 122 of the microphone
device 110 Are divided by the resistor 119 to half of the maximum amplitude Vdd. Also, when
the switch 118 of the amplitude modulator 117 is turned off, the signal terminal 122 of the
microphone device 110 and the resistor 119 of the amplitude modulator 117 are disconnected,
and the synchronous clock signal at the signal terminal 122 of the microphone device 110 Is the
maximum amplitude Vdd. The voltage of the synchronous clock signal at the detection point 140
of the audio signal processing device 130 is substantially equal to the voltage of the synchronous
clock signal at the signal terminal 122 of the microphone device 110. Further, the falling edge of
the synchronous clock signal at the detection point 140 of the audio signal processing device
130 is detected by the audio signal detector 133 of the audio signal processing device 130.
When the synchronous clock signal 600 shown in FIG. 6 is output to the audio signal processing
device 130, 1 information of the digital audio signal is detected at a falling point 610 from
the voltage Vdd of the maximum amplitude of the synchronous clock signal 600, At the falling
point 630 from approximately half the voltage Vdd of the maximum amplitude of the
synchronous clock signal 600, the "0" information of the digital audio signal is detected. As
described above, the microphone device 110 collects the voice and generates the analog voice
signal, the voice signal generator 111, the signal terminal 122 to which the synchronous clock
signal is applied, and the analog voice signal. And an analog-to-digital converter 116 for
converting a digital audio signal into a digital audio signal and outputting a digital audio signal
synchronized with the synchronous clock signal, and an amplitude for modulating the amplitude
of the synchronous clock signal applied to the signal terminal 122 with the digital audio signal. A
modulator 117 is provided, and a terminal for a synchronous clock signal and a terminal for an
audio signal are integrally formed on the printed circuit board 120, and the number of terminals
on the connection surface of the printed circuit board 120 is three. The diameter can be made
smaller than that of the conventional microphone device in which the number of terminals is
four.
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In addition, the amplitude modulator 117 of the microphone device 110 includes a resistor 119
for dividing the voltage of the synchronous clock signal, and a switch for switching connection
and disconnection between the signal terminal 122 and the resistor 119 according to the value
of the digital audio signal. Since the configuration of the present embodiment 118 is provided,
the diameter can be made smaller than that of the conventional microphone device with a simple
and inexpensive configuration. Also, the microphone device 110 acquires a synchronous clock
signal by detecting the rising of the voltage at the signal terminal 122, and the audio signal
processing device 130 detects the falling of the voltage at the signal terminal 134, thereby
generating voice. Since the signal is acquired, the microphone device 110 and the audio signal
processing device 130 can easily acquire the synchronous clock signal and the audio signal,
respectively. In the embodiment described above, depending on whether the audio signal
detector 133 of the audio signal processing device 130 is falling from the voltage of the
maximum amplitude or falling from the voltage of half the maximum amplitude. Although an
example of detecting 1 information and 0 information of an audio signal has been
described, the present invention is not limited to this, and the audio signal detector 133 of the
audio signal processing device 130 detects a voltage of maximum amplitude. The 1
information and the 0 information of the audio signal may be detected by detecting the
presence or absence of the falling edge of each of the voice signals in synchronization with the
synchronous clock signal at predetermined intervals. Further, in the above-described
embodiment, the microphone device 110 acquires the synchronous clock signal by detecting the
rise of the voltage of the signal terminal 122, and the audio signal processing device 130 detects
the rise of the voltage of the signal terminal 134. Although an example in which an audio signal
is acquired by detecting a down has been described, the present invention is not limited to this,
and when the positive / negative logic of the signal is different from this embodiment, for
example, the microphone device 110 may The synchronous clock signal is acquired by detecting
the fall of the voltage V. The audio signal processing device 130 acquires the audio signal by
detecting the rise of the voltage of the signal terminal 134. Further, in the above-described
embodiment, the microphone device in which the capacitor is configured by the diaphragm 112
and the electrode plate 113 has been described as an example, but the present invention is not
limited to this and deviates from the spirit of the present invention However, the present
invention may be applied to other microphone devices as well as to devices other than
microphone devices. As described above, the present invention enables the device to be
miniaturized.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a microphone device and
an electronic device according to an embodiment of the present invention. FIG. 2 illustrates an
example of an amplitude modulator in the microphone device according to an embodiment of the
present invention. FIG. 3 is a cross-sectional view showing a structure of a microphone device
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according to an embodiment of the present invention. FIG. 4 shows three terminals formed on a
printed circuit board in the microphone device according to an embodiment of the present
invention. FIG. 5 is a diagram showing an example of an amplitude-modulated synchronous clock
signal in the microphone device and the electronic device of the embodiment of the present
invention. FIG. 6 is the synchronization in the microphone device and the electronic device of the
embodiment of the present invention. Diagram showing rising and falling points of clock signal.
FIG. 7 is a block diagram of a conventional microphone device and an electronic device. 100
shows the terminals formed on the printed circuit board of the board. 100 electronic device 110
microphone device 111 audio signal generator of microphone device 112 diaphragm of
microphone device 113 electrode plate of microphone device 114 integrated circuit of
microphone device 115 Microphone device amplifier 116 Microphone device analog-to-digital
converter 117 Microphone device amplitude modulator 118 Microphone device switch 118a
Microphone device transistor 119 Microphone device resistor 120 Microphone device printed
circuit board 121 Microphone device power terminal 122 Microphone device Signal terminal
123 Ground terminal of microphone device 130 Audio signal processor 131 Synchronous signal
processor audio signal processor Signal generator 132 Resistor of audio signal processor 133
Audio signal detector of audio signal processor 134 Signal terminal of audio signal processor
140 Detection point of audio signal processor 350 Housing of microphone device 351 Opening
of microphone device 352 Microphone device insulator spacer 353 Microphone device
diaphragm ring 354 Microphone device insulating fixture 355 Microphone device gate
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