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DETAILED DESCRIPTION OF THE INVENTION The present invention relates to microphone
devices, and more particularly to microphone devices capable of obtaining digital and analog
signal outputs. A conventional microphone device comprises a vibration-electric converter which
obtains an analog electric signal proportional to mechanical vibration generated in a diaphragm
or diaphragm by sound waves in a microphone case, and amplifies an analog electric signal from
the vibration-electric converter. And an amplifier for storing an analog signal as a microphone
output. However, such a conventional microphone device has disadvantages such as highfrequency component deterioration and noise mixing when the cable from the microphone
device becomes long. Even a wireless microphone device that modulates radio waves of an
appropriate frequency with an analog electrical signal from a vibration-electric converter and
transmits the modulated wave has a disadvantage that noise is also mixed due to the electric field
strength. The present invention provides a completely new microphone device which does not
have these drawbacks and disadvantages. Fig. 4 shows an example of the microphone device
according to the present invention in a microphone case fll, a vibration-electric converter (2), and
an amplifier (3) for amplifying an analog electric signal from the vibration-electric converter [2].
An A-D converter (4) for converting an analog electrical signal passed through the amplifier (3)
into a digital electrical signal, a digital output of the A-D converter (4), and an analog from the
amplifier (3) The switching means (5) for switching the output is accommodated. The switching
means (5) is, for example, a slide switch mounted so as to be operable from the outside of the
microphone case (1), and this slide switch has a contact a. b and a common contact C in parallel
with a slide contact piece (6), the output end of the A-D converter (4) is connected to the contact
a, the output end of the amplifier (3) is connected to the contact, and the common contact C is
connected to the microphone case (a cable (7) led to the outside of 11). The sliding contact piece
(6) of the switching means (5) is bridged between the contacts by sliding between the common
contact C and the contact a or between the contact and the common contact C, and the contact
between them is bridged. A digital output or an analog signal output from the amplifier (3) is
derived from the cable (7) through the common contact C. Here, as an A-D conversion method in
the A-D converter (4), pulse width modulation (PWM), pulse position change ill (PPM), pulse
modulation ff1 (pNh), pulse code i ill (PCM), etc. Can be taken
In particular, pulse code modulation is preferred. In the case where the A-D converter (4) is
housed in the microphone case (1) to take out the digital output in the microphone case (1) as in
the present invention, the receiving equipment such as a studio also has a corresponding
configuration It is necessary to be configured to receive a digital input signal. However, as
described above, the conventional microphone device picks up an analog output as a microphone
output, and a receiving facility such as a studio has a configuration corresponding thereto. In
consideration of this point, the performance → figure is configured to be usable with any
receiving equipment. According to the present invention, the microphone case (the vibrationelectric conversion 1F2 + in 11 and the vibration-electric conversion) and the A-D converter (4)
for converting the analog electric signal from the weapon (2) into the digital electric signal Since
the means (5) is housed and digital or analog signal output is taken out as the microphone
output, the receiving device side which receives the output signal from the microphone device (in
short, an apparatus to which the microphone is connected, eg tape recorder If the mixing device
or the like is not compatible with digital input, the analog receiver can be used by switching the
switching of the microphone device to the analog side. Also, when the output from the
microphone device may be attenuated during transmission, for example, when used as a
microphone for a party such as a party, when the transmission distance is relatively short, and
further during transmission. If noise may be mixed in or affected by an external signal, it is not
necessary to convert the signal and transmit it intentionally. In this case, the switching means
should be analog output, and it is not desirable to receive external influence such as recording.
Furthermore, in the case of long distance transmission, the switching means may be switched to
the digital output side. Furthermore, according to the present invention, when A / D conversion is
performed to obtain a digital output, an audio signal without deterioration of signal information
can be obtained.
Brief description of the drawings
FIG. 1 is a system diagram of a microphone device showing an embodiment of the present
(1) is a microphone case, (2) is a vibration-electric converter, and (4) is an A-D converter.
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