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FIELD OF THE INVENTION This invention relates to audio devices. Conventionally, the vibration
detector has been attached to the speaker unit in order to apply morale feedback (referred to as
MFB) to the speaker, but this is limited to a special unit, and it is common to In order to apply
MFR to the speaker, there was no way other than using a voice coil to configure a Brifuji and
using its back electromotive force. On the other hand, for detecting the reproduction sound of the
speaker, as shown in FIG. 1, the microphone 5 is attached to the front of the speaker 3 of the
speaker box 1, and the signal of the microphone 5 is fed back. 2 is a high sound speaker, 4 is a
mounting angle. However, this device has a disadvantage that it can not carry out MFB unless it
is a speaker to which the microphone 5 is attached. Further, the microphone 5 and the angle 4 in
FIG. 1 have a problem that the radiated sound field of the speaker 1 is disturbed to degrade the
sound quality. OBJECTS OF THE INVENTION It is an object of the present invention to solve these
drawbacks and to provide an audio device that can easily apply moral feedback to any
loudspeaker. Configuration of the Invention In the present invention, a feedback microphone
(acoustoelectric converter) is provided in the case of an apparatus body having an amplifier for
driving a speaker. Because of this, it is possible to apply MFB to all the speakers, yet not disturb
the radiated sound field of the speakers. DESCRIPTION OF THE PREFERRED EMBODIMENT An
embodiment of the present invention is shown in FIGS. That is, in FIG. 2, the microphone 5 'is
attached to the panel 7 of the audio amplifier C (hereinafter referred to as amplifier C) 9). 6 is a
switch, 8 is a feedback volume. The output terminal of the amplifier 9 is connected to the input
terminal of the speaker box 1 as shown in FIG. 3, and the reproduction sound of the speaker 2.3
which generates the speaker box 1 in the vicinity of the speaker 2.3 is microphone 5 '. To make
feedback to the speakers 2 and 3 via the amplifier 9, but in the case of negative feedback,
feedback is made if the phase of the reproduced sound of the speakers 2 and 3 and the detection
sound of the microphone 51 is 90 degrees or more. It is well known that the amount must be less
than one. In order to provide negative feedback to the acoustic velocity of 340 m40 and 300) Iz,
the distance between the microphone 5 'and the speaker 2.3 must be within about 28.alpha.
From the wavelength. FIG. 4 is a block diagram of the amplifier 9. The reproduction sound of the
speaker 2.3 is received by the microphone 5 'as sound pressure and is applied to the inverting
input of the power amplifier 13 through the feedback amplifier 11 and the phase correction
circuit j2. ing.
The feedback volume 8 is for changing the amount of feedback, and the power amplifier 13.
Assuming that the gain of each feedback amplifier 11 is A and β, it is well known that the lowest
resonance frequencies of the speakers 2 and 3 after feedback decrease in proportion to the
reciprocal of the feedback amount 1 + Aβ. 14はスピーカのネットワークである。 Although
FIG. 4 shows the case of acceleration feedback, it is a matter of course that the feedback of the
feedback amplifier 1 is integrated to apply speed feedback and amplitude feedback. With such a
configuration, it is possible to apply moral feedback to the speaker simply by installing and
connecting a feedback microphone and a power amplifier equipped with a feedback circuit in the
vicinity of the speaker without requiring any modification to the speaker. The range of
application is extremely wide, and it is possible to solve all the problems of the multi-roles of the
MFB system and the wire connection which are conventionally considered, and the value of the
application is extremely high. Also, in the MFB in which the vibration detector is attached to the
speaker as in the prior art, the disturbance of the frequency characteristic due to the diffraction
effect or reflection of the Svee-Cavx can not be detected, but in this embodiment the total sound
pressure radiated from the speaker box 1 is In order to detect, the frequency characteristic after
feedback also becomes smooth in proportion to the feedback amount, and distortion due to busy
condition such as bending movement of the speaker diaphragm which can not be detected by the
vibration detector or resonance of the cabinet is also detected. There is also an advantage such as
can. Furthermore, although the thing which provided the microphone in the power amplifier was
shown in the Example, audio apparatus main bodies, such as a pre-amplifier (pre-stage amplifier)
other than a power amplifier, equalizers, an integrated amplifier for audio provided with
equalizers, etc. Of course, it can be placed at any position. Effects of the Invention The audio
device of the present invention has the effect of being able to apply MFB to any speaker, and to
reduce distortion to disturb the radiated sound field of the speaker.
Brief description of the drawings
(5) FIG. 1 is a perspective view of a conventional example, FIG. 2 is a perspective view of an
amplifier according to one embodiment of the present invention, FIG. 3 is a perspective view
showing an amplifier and a speaker, and FIG. is there.
2.3: Speaker, 5 ': Microphone, 9: Amplifier (audio device main body) 11, 11: Feedback amplifier,
13: Power amplifier (65 in FIG. 9, second in FIG. 3 Figure 4
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description, jps5990494
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