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Description 3 Title of the Invention
3. Detailed Description of the Invention The present invention relates to a mittalophone amplifier
for extracting an output of an acoustoelectric converter. (1) A storage transducer, in particular, a
microphone, is designed such that its vibrating body portion moves with some degree of
stiffness. For this reason, a non-linear relationship between the force (sound pressure) causing
the movement and the momentum (amplitude) is common. However, if the momentum is very
small, it can be seen as an approximately linear relationship within the extremely small range, so
if the change in sound pressure level is not so intense, it will be so noticeable as in a conventional
microphone The acoustoelectric conversion can be performed without distortion. However, even
if it is not noticeable, there is still a distortion to be improved. Also, apart from this, microphones
generally tend to saturate at a high level of sound pressure, and it is believed that the installation
of mitarophone, for example, requires extremely advanced experience and technology. An object
of the present invention is to provide a microphone amplifier which enables the above-mentioned
micro-air conversion. EndPage: Hereinafter, embodiments of the present invention will be
described in detail with reference to the drawings. First, the microphone amplifier according to
the present invention is an electrostatic microphone. It is a so-called reversible type that can be
driven in an acoustic manner, such as an electrodynamic microphone and other electromagnetic
or piezoelectric types, but can be electrically reversely driven. In the case of this reversible
acoustoelectric converter, for example, in the case of an electrodynamic microphone, as shown in
FIG. 1, the output side of the amplifier A having a sufficient gain is as if the output of the
amplifier A through the load innobiance R. Connected so as to be reversely driven. At the same
time, the amplifier A is subjected to a sufficient amount of negative feedback from the output
side to the input side as shown in the drawing. Here, when the microphone MC is driven by
sound and the vibrating body portion (diaphragm etc.) vibrates, the vibration of the vibrating
body portion generates an electrical conversion output at the terminal of the microphone MC.
This conversion output is negatively fed back to the input +1 111 of the amplifier A. Then, the
amplifier A generates an electrical output which cancels the conversion output negatively fed
back to the input side by its negative feedback operation to the terminal of the microphone Mc
via the load impedance R. To work. If the operation state to the amplifier which operates in this
way is taken out as a signal, this signal is equivalent to the electrical conversion output of the
microphone Mc.
In the embodiment, the load impedance R extracts the operating state of the amplifier A as a
conversion output. A resistor is used as this field t1 load impedance R. Also, as the load
impedance R, a choke, a coil or a transformer, or an attenuator may be used. The amplifier A is
used having a differential input, the force of which is fixed to the microphone Mc and the other
to the ground potential. By the way, in the above embodiment, the microphone Mc is reversibly
driven by the negative feedback amplifier A. With this, as for the mitarophone Mc, its vibrator
portion is driven by the acoustic power to move (or vibrate) If so, the amplifier A performs an
electrical reverse drive to cause movement in the direction opposite to that of the seven
movements. That is, the above-described microphone amplifier suppresses the amount of
movement of the vibrating body portion of the microphone MC to a small degree. The acoustic
power received by the vibrator portion can be electrically converted and extracted. Thereby, the
conversion distortion which increases according to the amount of amplitude of the vibrating
body portion can be reduced, and the low distortion conversion is possible without damping and
saturating the motion of the vibrating body portion even for high sound pressure levels. Can be
Depending on the type of microphone, the amplifier A may be negatively fed back as shown in
FIG. 2, for example. As described above, the microphone amplifier according to the present
invention reduces distortion due to the momentum of the vibrating body portion from the
acoustoelectric transducer, and makes it difficult to saturate even with a high level of pressure so
that low distortion and wide spread are realized. It is necessary to take out the electrical
conversion output of the range.
4. Brief Description of the Drawings FIG. 1 is a circuit diagram showing an embodiment of the
present invention, and FIG. 21 is a circuit block showing another embodiment. Mc ······
Microphone A ······ Amplifier ······················ Load resistance Patent applicant Masaki Yoshimura
EndPage: 2