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JPS5296529

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DESCRIPTION JPS5296529
Specification L Title of Invention
チャンネルデバイダ−
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a channel divider
for correcting in advance in an electrical signal the phase difference of a reproduced sound field
based on the spatial distance between speakers connected to each channel output of a multichannel sound reproducer. There is a so-called multi-channel system in which, for each band, a
speaker most suitable for reproduction of the sound of that band is used. In this case, since each
speaker shares a different band of high frequency, middle frequency, low frequency equal age
wave number, the aperture, the distance between the diaphragm and the edge, etc. are different,
and the edges of the speakers are generally attached on the same plane When 1, the vibration
part of the low range speaker comes to several 10 m to several m back compared with that of the
high range. Therefore, as shown in the diagram, the sound from the low range speaker and the
mid range speaker reaches the position f # of the listener with a time delay compared to the
sound of the high range speaker, and these times (phases) are delayed It has a different
appearance to the original sound due to the synthesis of sound waves. Fig. 1 is a block diagram
of the case where the phase difference of the reproduction sound field is not corrected, 1 is a
source, 2 line channel divider, 3, 4 and 5 are increase of each channel. “+ 6 + 7.8 is the speaker
of each channel, 9 is the listener, S seconds, in, 11.12 is the position of the sound wave reached
when the signal of each channel at the same time is emitted from each speaker, The wave front is
back and forth, and the sound wave from the low frequency speaker 8 has a time delay compared
to other sounds EndPage: 1 wave, reaching the device of the lie 9 with such a drawback There is
a method to inject high frequency, medium frequency, and low frequency speakers in order to
eliminate the four crotch that the vibration surface of each speaker is equidistant from the 111
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remover, but the crookedness (attachment) of the speaker becomes complicated , Loudspeaker
speakers pop out and get in the way, One theory is that the directivity is too strong but there are
various drawbacks. Further, as shown in FIG. 2, there is a method of converting the difference in
the spatial distance of each speaker into time, inserting a delay circuit 18.14 of snow and air
signals for each channel and electrically correcting it. However, in this method; the delay circuit
is very expensive. Such a method that requires several such delay circuits is not common. The
present invention has been made in view of the above-mentioned drawbacks. The block diagram
of one embodiment of the present invention will be described with reference to the drawings.
214 input, 22 is a delay circuit, 23 and 24 are delay circuit outputs, .tau.19 and .tau.2 each delay
time, and 25 is a high band p. The wavers, 26 are band P wavers, 27 low frequency F wavers,
28.29.30, dry at the output of each channel.
In the figure, part of the low frequency signal coming in from the input 21 is led to the low pass
door wave device 27 and becomes the output 80 of the channel OH3. On the other hand, part of
the signal from the human power 21 is led to the delay circuit 22. The delay amount # 522 can
be used to tap several taps so that the lightning signal can be delayed in a low frequency full
band Kh or an arbitrary time step. As shown in FIG. 1, assuming that the spatial distance between
the speaker 6.7.8 of each channel and the listener 9 is el / 2.13 and (ll </ z </ s), respectively,
Delay time τ! , Τ2 is given by the following equation. τ-1-31x (1) Lc7 □ = = (L co) = ... (2)
where C is the speed of sound, and the speed of sound C is 34Q? If Fl / Sec / 311 = 8-4 m, then
the delay time τ1 is 10 m @. Output from the respective taps to the Hj forces 28 and 29 of the
channels OH1 and CH2 through the high pass filter 25 or the band pass Filler 26 according to
the delay times τ1 and τ2 determined by the above calculation. After delaying each channel
with respect to the base channel (OH8) for an appropriate time, if an acoustic signal is emitted
from the speaker through the amplifier, it is offset with the difference in distance from the
diaphragm to the listener 1 It is a block diagram of information 1t (in FIG. In FIG. 4, 31.32 is an A
/ D (analog to digital) converter, 83.84 is a digital delay circuit, 35.86 is a D / A converter, 37.38
is an input of the channels OHI and OH'2, 89 ,? 40. The output of the channel / channel CE1
and the channel Ch. FIG. 5 is a block diagram of a real example of the delay circuit (22) divided
into FIG. 3 of the present invention. In the figure, 41 is an input, 42 is an A / D converter, 48 is a
digital delay circuit, 44.45 is a D / A converter, 46. 47 is an output of channels CHI and CH2, and
digital as a delay element of the delay circuit.・ Use memory. Although some delay elements take
linear signals as they are, they are not satisfactory in terms of distortion, frequency
characteristics, S / N, etc., but they are extremely superior in this respect if digital memories are
used. . In order to use digital memory, an analog-to-digital converter i (A / D converter) and a
digital-to-analog converter (D / A converter) are required before and after the memory.
Comparing the number of elements per channel in the conventional system of FIG. 4 with the
number of elements per channel in the present system of FIG. You can save 2 digital memories.
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This is a significant savings in terms of cost! The benefit is very large, and by incorporating a
delay circuit in the channel divider, it is possible to place a delay circuit in front of each F waver
and obtain a conventional equivalent effect EndPage: 2 with one set of delay circuits. it can. Since
the present invention is configured as described above, the phase difference of the reproduction
sound field based on the spatial distance between the speakers connected to each channel output
is corrected with the electric signal Kb in advance with an inexpensive and simple circuit
configuration. Can.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a multi-channel sound
reproducing apparatus without correcting the phase difference of the conventional reproduction
sound field, and a second frame is a block diagram of the same apparatus with the phase
difference of the conventional reproduction sound field corrected. 8 is a block diagram of an
embodiment of a channel divider according to the present invention, FIG. 4 is a block diagram of
the transit circuit of FIG. 2, and FIG. 5 is a block diagram of an embodiment of the transit circuit
of FIG. It is. In the figure, 21: input, 22: delay circuit, 28. 24: delay circuit output, τ1, τ2: delay
time, 25 nil delay circuit, 44. 45: D / A converter. 46.47: Output of channels OHI and CH2.
“1A” “1” “−1 ′ ′ tree” 2nd row 1P 3 FIG. T5 EndPage: 3
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