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1 ? Name of invention
A plurality of condenser microphone elements are arranged opposite to each other via a digital
microphone unit, and the output voltage due to the capacitance change of each condenser
microphone and the rophone element is compared with the reference voltage which is
sequentially different from each other A digital microphone characterized by obtaining an
integrated output.
3. Detailed Description of the Invention The present invention provides a digital microphone
which can extract the output of the microphone directly as a digital signal. Conventional
microphones have various configurations such as a capacitor type, a guinami sok type, a ceramic
type, etc., but the output is an analog output. On the other hand, it is known that when an
acoustic signal is recorded or transmitted as a digital signal, a good quality can be obtained
because the recording S / N ratio is good, the transmission quality is good, the noise resistance,
etc. Therefore, it is necessary to convert an acoustic signal into a digital signal, but the
'conventional microphone has an analog output, and thus requires an analog-digital converter. In
the present invention, a plurality of fixed electrodes are provided opposite to one diaphragm to
constitute a plurality of condenser microphone elements, and the outputs of the elements are
sequentially compared with different EndPage: 13-Qf and pressure. The present invention
provides a digital microphone which outputs an output as a digital signal and outputs a base
code. The digital microphone of the present invention will be described below. In FIG. 1, 1 is a
plastic film, and a metal film is formed on the surface of the plastic film 1 to form a 4L metal
layer 2 to form a vibrating film, and a constant air gear knob 3 is placed opposite to the vibrating
film. A plurality of fixed electrodes 4 are provided. The fixed electrode 4 is formed by sticking an
electretized polymer film 5 for applying an electrostatic field to the air gap 3 on one surface of
the electrode, and filling in the insulator 6. The lead 8 is taken out from each fixed electrode 4
and placed in the comparison circuit 1Q. The other electrode is taken out through the metal case
7. Now, when the vibrating membrane is displaced by 1), the electrostatic capacity of the air gear
knob 3 is changed, and an output voltage resulting from the change of the electrostatic capacity
is taken out from the eight and seven. The output voltage thus extracted is converted to a binary
code output through the circuit of FIG. The operation of FIG. 2 will be described below. FIG. 2
shows 2 ░, 2 'and 22 for binary code conversion, and 9 indicates each condenser microphone
element and each reference voltage by vo and 2vO9 + 2' Vo. The comparison circuits 1o of the A,
B and C circuits are sequentially switched to the high order bit side and the low order bit side.
Now, assuming that each bare hand of the microphone receives sound pressure to obtain an
output of Vo, the output of the transducer A is compared with {square root over (0)}. In the
comparison circuit 1 ░, the code output of A is 1 because the output voltage V is 1 when the
output voltage V is ? 0 and 0 when v <vO.
On the other hand, since Vo <2Vo in B, the code output is VO in olC (4Vo, so the code output is O,
indicating a binary code digit O20 ░ 1). Similarly, when the microphone output is 2VO, eight
circuits become one. The switch SWB is closed by the output of the comparison circuit 1o of the
eight circuits, and the reference voltage 2VO is added to the artificial path by the adder, so that
the standard voltage of the artificial path becomes 00 + 2 ? o-3vO. In the artificial road, the
reference voltage 3VO and 2Vo are compared and become ?. Of course, in the C circuit, since it
is O, the binary code output is o, 1. ????? Similarly, when the output voltage is 2 Vo, the
output code is 0, 1.1. When the output voltage is 4 Vo, first, the C circuit becomes 1 and in
conjunction therewith, the SW 'C is turned on. Therefore, in the eight circuits, the reference
voltage is added by the adder and 2 О 104 Vo = 6 Vo, so that the output of the eight circuits is
O? and the SWB is turned off. In the artificial road, the reference voltage is Vo + 4 Vo = 5 Vo,
the hood output is 0, and the binary code is 1 ░ o, o. In the same way, any microphone output
voltage can be easily converted to a binary code. As described above, according to the present
invention, a plurality of microphone elements are provided, the output signal is taken out from
each terminal, and a reference voltage consisting of a factor of two of each other, a comparator,
and a comparator are added.
4. Brief description of the drawings FIG. 1 is a cross-sectional view of a digital microphone
according to an embodiment of the present invention, and FIG. 2 is a block diagram of the digital
microphone. 1 и и и и и и и и и и и и и и и и и и и и и и и и plastic film, 2 и и и и и metal layer, 3 и и и и и и и и и и и и и и и и и и и и
и и и и и и и и и и и и и и и и и и и и и polymer film 6 ... insulator, 7 ...... metal case 8 ..... lead, 9 ...... condenser
microphone element, 1o ...... comparative amount jLSWB, SWC и иииииswitch. Name of Agent
Attorney Nakao and 1 other EndPage: ?
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