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JPS5652388

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DESCRIPTION JPS5652388
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a conventional product,
FIG. 2 is its output-force characteristic diagram, FIG. 3 is a block system diagram of the present
invention, FIG. 4 is an enlarged view of its microphone, FIG. Is a circuit diagram of the
microphone, and FIG. 6 is an output waveform diagram of the sound from the sounding body.
FIG. 7 shows an output waveform diagram of the sound from the speaker. ... 1st and 2nd
microphone units, 5 ... ... amplifiers.
DETAILED DESCRIPTION OF THE INVENTION The present invention is a loudspeaker system
using a microphone, which prevents occurrence of howling with a simple configuration. In the
prior art, as shown in FIG. 1, the sound emitted from the speaker IC) is positively fed back to the
microphone (α), and at that time, the ringing occurs frequently. As a measure to prevent this, it
has been proposed that the output characteristic of the amplifier as shown in FIG. 2 be canceled
by the speaker output characteristic. It has not been adopted in the field of Hifi because it
significantly impairs the characteristics. The present invention has developed a microphone in
which howling does not occur. An embodiment of the invention will be described with reference
to FIG. 3 and the following. (1) is a sound generator, (2) is a microphone, and a microphone unit
(3) and a microphone unit 4). (5)ハアンプ、(6)はスピーカである。 The distance between
the sounding body (1) and the seventeen microphone units (3) is as shown in FIG. 4, and
similarly, the distance 111fiB between the sounding body (1) and the microphone unit (4), the
microphone unit (3) and the microphone (4) is the distance between the C1 speaker (6) and the
microphone unit (4) as shown in FIG. 3 as in the case of D1, and the distance between the spill
force (6) and the microphone unit (3) is set at Ei. Fig. 5 is a circuit diagram in the microphone, in
which the polarities of the output terminals (6a) and (4G) of the miter unit (3) and the
microphone unit (4) are reversely connected, and the output is It is the difference between 81
and the microphone unit (4) so that it must be output twice. Thus, the attenuation of sound is
inversely proportional to the square of the distance, and the distances between the sounding
03-05-2019
1
body (1) and the microphone (2) and the microphone (2) and the speaker (6) are respectively less
than <A, B, and DSE. The characteristic of the present invention is that although C and C greatly
influence in A and B because of setting, C can be substantially neglected in D and E in the present
invention. As such, the microphone output waveforms of the sound from the sounding body are
as shown in Fig. 6.7. Therefore, although the sound from the speaker can be ignored, the sound
from the sounding body causes amplification, ie, howling occurs. It is not a thing. The present
invention is as described above, and by arranging two units in the microphone, even in a narrow
space, it has an effect of preventing a welling, and it becomes strong against extraneous noise,
and compared to the conventional howling. @Ifi, suitable for microphones for general
loudspeakers, loudspeakers for cars, karaokes for cars, etc.
Moth
03-05-2019
2
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