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DESCRIPTION JPS5347307

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DESCRIPTION JPS5347307
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a loudspeaker according to
an embodiment of the present invention, and FIG. 2 is a connection diagram showing the detailed
construction of the main part thereof. 1 to 4 · · · · · · · · Microphone, 11 to · · · · · · · · · · · · · · · · · · · · · ·
· Speakers, 31 to 34 · · · · · · · Variable gain amplifier for microphones, 21 ~ 24 · · · · · · · · · Variable
gain for speakers Amplifier, 5 ..... maximum voltage detection circuit.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a loudspeaker
system for use in multi-person conferences and the like, which automatically generates sound
pressure by controlling sound pressure distribution in a sound field. 12. Make sure that adequate
loudening can be performed. -It is intended as a sheep and j-- 2-3-2 gold. In the gist of the
present invention, a large number of microphones and speakers are distributed, and the
microphone and the speaker each have an amplifier with variable gain, and the amplification gain
is controlled by the manual sound pressure of the microphone. For example, it is assumed that a
variable-gain amplifier having a microphone and a speaker, respectively, is normally set to a low
gain of 1111v'C. Now, when there is an input to the microphone, the gain of the amplifier
attached to the microphone is a dog, and the control signal is set to increase the gain of the
speaker amplifier other than the speaker amplifier in the vicinity of this microphone Add As a
result, the loop gain is minimized to * 'itj' in the nearby microphone-speaker series, and the
amplification degree between the microphone and the other speakers is a dog, but the distance
attenuation effect of the sound pressure causes the far-off loop gain. In the following, an
embodiment of the present invention will be described with reference to the drawings. Reference
numerals 24 to 24 denote variable gain amplifiers for the speaker, 31 to 34 denote microphone
variable gain amplifiers, and 5 denotes a detection circuit of the maximum voltage of the
microphone line. FIG. 2 is an embodiment of the main part in FIG. 1. In each of the amplifiers 2124.31 to 34, switch elements (S21 to 8241sg + to SM) are provided in parallel with the resistor
R, respectively. The gain of the amplifier can be changed by turning it on or off. Further, the
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detection circuit 6 picks up the maximum level of the microphones 1 to 4 with the comparators
61 to 53 which compares two human powers with the operation level set value 1 or more, and
based on that, the controller 54 switches The corresponding one of '-861 to S54 is turned off,
and the corresponding one of the switch elements 321 to S24 is turned on. Next, when the
outputs of the microphones 1 to 4 are equal to or less than the operation level setting value T,
the switch elements SKI to S54 are turned on, and the switch elements 8. When the microphone
1 has an input, the detector 5 detects that the output of the microphone 1 is equal to or greater
than the set value T.
Then, the control signal generated by the detector 5 causes the switch element S3. Is turned off
to increase its gain, and the gains 1 of the other microphone amplifiers 32.33.34 are kept small.
On the other hand, the switch element S21 of the speaker amplifier 21 is turned on by the same
control signal (or its inverted signal) to reduce the gain. The other speaker amplifiers 22 and
23.24 have large gains. The gains of the amplifiers 31 to 34 and the amplifiers 21 to 24 have
two values, and the level difference between large and small values is, for example, Nm / jh1.
That is, the optimum value can be determined by the ratio of the HM microphone-speaker
interval and the interval between the adjacent loudspeakers. A1. If 1m and / m are 4m, the
large and small flowers of gain will be 12 dEl. Conventionally, the loop gain in the case of
generating the urling is microphone 1-amplifier 31-amplifier 21 and clean-per- '' '' '1' '' 1 m III Tf
* li: af 'L' '5 According to this, only Nm / L +... Creates a margin for urling, and in the above
example, an extremely large effect of, for example, 12 dB is generated. The above describes the
case where the gain of the amplifier has two values, but by using one having three values or an
un value, the sound of the speaker is sequentially from the vicinity of the sound source
generation point (that is, the point of the microphone that obtains the maximum output). It is also
easy to distribute the pressure to dogs by simple logic construction. In this case, as described
above, only one microphone is always in a sound collecting state. As is clear from the above
embodiments, according to the present invention, it is possible to perform the loud-sounding
operation of the light volume without causing the ringing.
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