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JPS63260400

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DESCRIPTION JPS63260400
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
microphone for converting sound waves such as music into electrical signals. (Conventional art)
A conventional microphone converts an input sound wave into a minute analog electric signal
and amplifies it to a level necessary for transmission by a microbon amplifier. Therefore, when
the output of such a microphone is used in digital audio equipment, it has to be converted into a
digital electrical signal, and many signal processing circuits are required for the conversion. FIG.
5 shows the conventional example, and the sound wave S inputted to the microphone 13 is
converted into a minute analog electric signal, amplified by the microphone amplifier 14, and
enters the digital audio equipment 16 through the transmission path 15. The analog signal input
to the digital audio device 16 is amplified to a necessary level by the amplifier 17, and the lowpass filter 18 removes unnecessary harmonic components to prevent generation of aliasing due
to aliasing during sampling, thereby generating a clock. Sampled and held by the sample-andhold amplifier 20 according to the sample-and-hold control signal C input from the converter 19,
and the conversion start signal D @: received from the clock generator 19 in the analog-to-digital
converter 21 to become the digital electrical signal E It is a thing. (Problems to be Solved by the
Invention) As described above, when the output of a conventional microphone is used in a digital
audio apparatus, an analog-to-digital converter is expensive, and one with stable characteristics is
obtained, and The output of the microphone passes through the transmission path in the form of
an analog signal, so that noise is easily mixed in, and there are problems that distortion is easily
generated because there are several stages of amplifiers. SUMMARY OF THE INVENTION In view
of the above, the present invention provides a microphone capable of directly supplying sound
waves such as music as digital electric signals to digital audio equipment without requiring a
complicated signal processing circuit. (Means for Solving the Problems) Therefore, the present
invention provides a fixed light source, a portion orthogonal to the optical axis of the light source
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and absorbing or transmitting incident light from the light source and the light source from the
light source outside the portion A light receiving portion comprising a diaphragm having a
portion for reflecting incident light, and a plurality of light receiving elements arranged in a
single row for receiving light reflected by the reflection portion of the diaphragm and converting
it into an electric signal; It is equipped. (Operation) When the position of the diaphragm changes
due to sound waves. The distance from the fixed light source to the diaphragm changes by the
amount of change in the position of the diaphragm.
Assuming that the incident angle from the light source to the diaphragm is α, since the incident
angle α is always constant if the diaphragm moves away from the light source by ΔX, the
reflection position (reflection range) on the diaphragm increases by Δx tan α. Since the distance
from the point to the light receiving part is constant, the reflected light increases the light
receiving range by 8 × tan α on the light receiving part. Conversely, if the diaphragm
approaches ΔX to the light source, the light reception range is narrowed by Δx tan α. すなわち
。 The change in the position of the diaphragm due to the sound wave is the change in the light
receiving range (light receiving width) of the reflected light in the light receiving unit. The light
receiving width is detected by a light receiving unit including a plurality of light receiving
elements arranged in a line, and the number of the light receiving elements is counted to be
converted into a digital electric signal. (Embodiments) FIG. 1 to FIG. 3 show an embodiment of
the present invention, in which 1 is a cylindrical casing, and a diaphragm 2 which vibrates by a
sound wave S is provided at the inlet of the casing. The diaphragm 2 is composed of two parts, a
central part 4 for absorbing or transmitting incident light from the light source 3 linked to the
diaphragm 2, and a part 5 for reflecting incident light from the outside. When incident light from
the light source 3 located on the center line orthogonal to the diaphragm 2 is reflected by the
reflecting portion 5 of the diaphragm 2, it is absorbed or transmitted in consideration of the fact
that 1 reflected light does not return to the light source 3 The reflected light reflected by the
reflecting portion 5 which sets the boundary position between the portion 4 to be reflected and
the reflecting portion 5 is formed by a plurality of light receiving elements 7 arranged in a line
such as a line image sensor and interlocked with the diaphragm 2 The light receiving portion 6 is
converted into an electrical signal. The diaphragm 2 is vibrated by the sound wave S, and as
shown by the broken line, when the positions of the diaphragm 2 and the light receiving unit 6
change, the reflection position If (range) in the reflection portion 5 of the diaphragm 2 changes.
The light receiving width (range) in the portion 6 changes. At this time, if the diaphragm 2
approaches the light source 3, the light receiving width (range) in the light receiving unit 6
becomes smaller, and becomes larger as it gets farther. The light receiving width of the reflected
light in the light receiving unit 6 is detected by a plurality of light receiving elements arranged in
a line, such as a line image sensor, and the number of elements received is counted and
converted into digital values to convert the vibration of the diaphragm 2 Convert to digital
electrical signals. The digital audio device using the microphone of the present invention is
shown in FIG. 4. The output signal of the microphone 8 enters the digital audio device 10
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through the transmission line 9 and is based on the sampling frequency generated by the clock
generator 11 In response to the latch clock A, the latch circuit 12 latches at a constant interval.
The output of the latch circuit 12 is a digital music signal B to be subjected to subsequent signal
processing. This is equivalent to the digital music signal E in the conventional digital audio device
shown in FIG. As described above, when the microphone of the present invention is used, the
circuit configuration for obtaining the digital music signal necessary for the digital audio device
is extremely simplified as compared with the case where the conventional microphone is used. な
お。 If the diaphragm 2 of the microphone of the present invention has the characteristics of a
low-pass filter having a cut-off frequency equal to or less than 172 of the sampling frequency
when the output signal of the microphone is processed in digital audio equipment, sampling is
accompanied. There is no occurrence of aliasing distortion due to the alias effect. (Effects of the
Invention) As described above, in the microphone of the present invention, the output signal is a
digital signal, noise is not mixed in during transmission to another device, and an amplifier is not
required. There is no distortion other than the distortion that occurs, and digital electrical signals
required in digital audio equipment can be obtained with an extremely simple circuit
configuration.
[0002]
Brief description of the drawings
[0003]
1 is a cross-sectional view of an embodiment of the present invention, FIG. 2 is a cross-sectional
view taken along the line AA 'of FIG. 1, FIG. 3 is a cross-sectional view taken along the line BB' of
FIG. FIG. 5 shows a circuit block diagram for obtaining a digital music signal with a conventional
digital audio device using a microphone and for obtaining a digital music signal with a digital
audio device using a microphone.
2 ... diaphragm, 3 ... light source, 4 ... part absorbing or transmitting light, 5 ... part reflecting
light, 6 ... light receiving part, 7 ... light receiving element. Patent applicant Matsushita Electric
Industrial Co., Ltd. Fig. 1 Fig. 2 Fig. 3 1-yen rrI-like case # 2-station pruning 3- 3-line school 4-11
'scissor blade or jAI core-> t / ll * 5-4! JJ Susu p p p 6 受 7 受 木 4 4 Figure 8-Microphone 9-!
Screaming 10-, digital audio recorder & instrument 11-clock number 12-'′ ′), 7 circuits
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