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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
improvement of an acoustic system including a speaker, a microphone and the like. (B) Prior art
and problems FIG. 1 is a diagram for explaining the prior art. SP is a speaker, SPA is an amplifier
for a speaker, MIC is a microphone, M is an amplifier for a microphone, and l is a hybrid
amplifier. ', F is a terminal station. When a remote audio conference is conducted via a public
network as shown in FIG. 1 with speakers and phono (integral microphone and speaker), speaker
S l)-microphone MIC-circuit-speaker S The system may oscillate due to the P foot hack loop. The
following method has been taken to implement such a feedback loop. (1) Detection of voice
response, time division 1. I change the spring of Tri's spring. (2) Give a speaker microphone 1 h
directivity and cut the loop acoustically. (3) Automatic interest i! By the control, it is controlled
not to add the oscillation stripe ('l to l + Ц i. Either method has limitations in the arrangement of
speakers, microphones, and can not talk simultaneously at the same time as sending and
receiving, there is a disadvantage that the head of 1m talk is scraped. OBJECTS OF THE
INVENTION C1 The purpose of the invention is to eliminate the drawbacks of 1) and to provide a
speaker-phone type for a good audio conference. According to the present invention, in an
acoustic system comprising a plurality of speakers and a microphone, the speaker output and the
adjuvant space from the amplifier input for the speaker , And the transfer characteristics to the
microphone and the amplifier output for the microphone are automatically measured and
analyzed, and based on the result, the simulator circuit is automatically simulated to the
transferability 1 (1 to 1 and the simulation circuit 1 completes the simulation circuit). Each time
the outputs of the nit transfer circuit and the simulator circuit are connected to each other in a
parallel manner to the transfer circuit from the speaker amplifier to the speaker output, the
acoustic space, the microphone, and the amplifier output for the microphone from the human
amplifier for the speaker. This is achieved by providing a speaker-Fumenka type that is
characterized by [E1 Embodiment of the Invention An embodiment of the present invention will
be described below with reference to the drawings. The gist of the present invention is obtained
by self-measuring the transfer characteristic from the amplifier SPA input of the speaker S +) to
the output of the amplifier MA of the microphone MIC and applying a part of the amplifier SPA
input to the present simulator circuit. By canceling the power output from the amplifier MA
output that actually passes through the space, electrically canceling the acoustic coupling and
cutting the feedback 1-hack loop to realize a stable speaker phono That is, it adapts to any
acoustic environment such as multiple microphones for multi-speakers, speakers, and the
acoustic time 1 eta-of the conference room.
FIG. 2 is a diagram for explaining the present invention, in which a plurality of sets of speakers,
SPA are amplifiers for speakers, a plurality of microphones for MICs, and a plurality of
microphones for MAs are installed. Is a measuring instrument for waveform analysis, ? is a
hybrid coil, S L '. Q is a sequence controller, ?, a coupler, ? is a unit impulse J'l [, TFIL is a
transversal filter, n?1 ? ? i?jt, a delay time of 1 t per delay time per tap 1? ? ? Y is a
coupler for taking the difference between M ? small output '?F L output and i ? ? / U is a
combination of ? ?? and ? ? ? ?, and i / ? ? ?, 'I' EL is a telephone. The operation will
be described below with reference to FIG. At the completion of volume adjustment of amplifier
sp8 and amplifier MA, the T '/ U switch is switched to the' F side (training) by the sequence
controller Sl et al., Unit impulse generator, unit impulse ?, each S l) Enter in eight. The outputs to
the amplifiers SP enter the respective microphones MIC via space, and the respective microphone
outputs are amplified by the amplifier M? and combined by the coupler ??. This synthesized
waveform enters the waveform analysis measuring instrument M 148 located on the T / U switch
or 'F' side, where the synthesized waveform is analyzed. In general, the acoustic response M for
jl) order / impulse ? is H = t 'heart, A5 и 4) ljl L A, ~ ~ -7 is i и' 'o measured from unit impulse ?
generation time The microphone signal 1 ? width (direct, ?, synthesized at L, is a unit noise
generated at L ?i и ? I =. As described above, the impulse response of Pf ? and ? based on ?
is obtained and the impulse response of the system is obtained. However, in the measurement of
transmission of such a system, ambient noise enters MIG as well. But, measure a few times and
find the average value of Mr. ~ A # -7, person. By determining ? people и Y, the influence of
ambient noise can be reduced. The simulator circuit of FIG. 2 uses a transversal filter "I'F I L", and
the "l 'F L L is composed of a delay circuit of n-films, n operational amplifiers, and a combination
circuit ?. , The input signal of the 1 ? ? FIL and each tap output of the delay circuit are
multiplied by the operational amplifier M I) L, and the coefficient at this time is ?1. Person
obtained by innomals measurement, ~ Enter 4T: Yes. ? Synthesis circuit ??. Synthesize at. ??
After completing the simulation 1 иии i ? ? / CI switch to SI-? Set to U side by control of Q. The
voice that enters from the point A to the SPA every time this is placed on the G) (d is connected
via the SPA ~ voice space ~ M ? z: (?. The output of the transformer / X + -sal] filter 'FFIL can be
subtracted from the signal generated at the output end by combining the signal ?, and the Shinji
of the point B can be made zero, ie, the sound between S) and MIC You can break the bond loop.
The above example ?Jj-Laning ? ? ? r was set, the acoustic characteristics were determined,
and the transversal filter 'rFI L was set based on this data, but the actual output 1a to the
speaker, from the microphone Automatic measurement can also be performed using the real
power of (i (P). The method will be described below with reference to FIG. At the same time, when
the actual input signal is applied to the amplifier 51) A, the other WS applied to the amplifier SPA
at that time and the output to the amplifier M at that time are taken. M is the signal at the output
of the coupled circuit. And J, M is expressed by the following equation. Mo-? / 21. S # -1 (2)
(14L S,, S, the output of the i-th tap of the delay circuit, both sides of the equation (2) are
multiplied by s, / s: N-'S-'= r < o 10, t, 5 ',-------,,' s' "<3-1) S: roughly, similarly to the amplifier S l) S
is applied manually, U7 The following equation is obtained by measuring the signal generated at
the output of the amplifier MA ratio output coupling circuit II. Brush = A6 bitter ? A, + ,,,-,-, -I / l?
(3-2> similarly to ?5 (i) is the autocorrelation coefficient of S). .PHI..about. (I) =.
Quadrature..PHI.i) is a cross correlation coefficient of S and M. FIG. (3-1) to (3-N) are as shown
below. Since it is assumed that the input signal of the amplifier SPA is non-non-dam, the
autocorrelation coefficients ei; and II) become substantially zero, the equation (4) further
becomes the equation (5). Therefore, the correlation coefficient is determined by repeating the
measurement repeatedly, and the equation (5) is calculated. The coefficient ? of each Knoop of
the transversal filter T F I L. You can ask for ~. The above-described operation of the amplifierMA ratio output coupling circuit ?, the operation of measuring and analyzing the small-output
generated signal, obtaining the correlation coefficient, and obtaining the input ?71-1 is
performed by the correlation coefficient calculator CVI. As described above, the transfer
characteristic of the acoustic field ? ? is measured by the training signal or the actual signal,
and from this there is an adaptive filter configured by the preferred parameters, whereby it is
possible to cut off the foot bank by acoustic coupling .
Such signal processing can be realized at a low price by using a one-chip signal processor with a
built-in A / 11 D / 8 converter. ("Effects of the Invention" As described above for the phase
resistance, according to the present invention, there is an effect that a stable acoustic system can
be configured by breaking the acoustic coupling between the speaker SP and the micro bon MIC.
Brief description of the drawings
1 is a general view of a speaker phono, and FIG. 2 is a drawing for explaining the present
invention, SP is a speaker, SPA is an amplifier of a speaker and m sets ii, MIC is a microbon, MA
is a mer N sets of cropon amplifiers are installed, MES is a measuring instrument for waveform
analysis, 11 is a vibrator 1 'coil, SEQ is a Siegens controller, ?, ?, a coupler, ? is a unit impulse
generator, TFIL is a transversal The filter is composed of n-1 stages of delay circuits, an
operational amplifier and a coupler .SIGMA.2, 'r / U' is a switching switch, and 'D' E L is a
FIG. 3 shows another embodiment, in which CVL represents a correlation coefficient calculator,
and the other symbols represent FIG. 2 and FIG.
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description, jps5923998
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