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JPS5219501

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DESCRIPTION JPS5219501
Secretary General of Patent Office Hideo Saito 4. Agent 〒 104 ■ Japan Patent Office ■
Japanese Patent Application Laid-Open No. 52-495010 Japanese Patent Application No. 52.
(1977)2. Q Office serial number specification 1, the name of the invention
A circuit that converts multi-microphone signals like dummy head signals
3. Detailed Description of the Invention The present invention is based on microphones in which
so-called multi-microphone signals obtained from seven microphones placed in front of a sound
source are placed in the left and right ears of a dummy head (human head model) The present
invention relates to a circuit for converting into a signal such as a so-called dummy head signal
which can be obtained, and in particular, even when the signal converted in this way is recorded
and listened as headphones in two channels or four channels. The purpose is to make it possible
to obtain a sense of breadth, depth and stereotacticity. Conventionally, when listening to the
sound from the speaker box of a stereo playback device, it is easy to obtain the spread, depth,
and localization of 2-channel or 4-channel stereo sound, but if you listen to this with headphones,
these left and right headphones EndPage: 1 from the left and right speakers stored in the main
unit, mixed with each other, without hearing each other, listening to sounds completely separated
from each other As a result, there was a drawback that a sense of depth and a sense of
localization could not be obtained. Humans have left and right ears EL as shown in Fig.1.
According to the time difference of the sound reaching the ER, it is said that it is a sensor that
senses the localization (direction, position) of the sound source S. That is, in this figure, with
respect to the sound source S, the right ear ER is 2 more than the left ear EL, so the sound SR
reaching the right ear ER is 340 seconds than the sound SL reaching the left ear EL (However,
the sound velocity is set to i340 (m / sec)). The sword · 2 is an illustration of the direct sound and
the diffracted sound generated when the sound reaches human left and right ears El, ER, and the
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diffracted sound SR 'reaching the right ear FIH reaches the left ear EL And it attenuates in the
high region (see Fig. 5). Also, according to the current recording and music tape recording
methods, there is almost no time difference between so-called multi right sounds, in which most
microphones are installed with a plurality of microphones in front of the sound source.
Therefore, when listening with all headphones, it is possible to sense the left and right, but there
is no sense before and after. Conventionally, as a means to eliminate such a defect in the listening
by headphones, at the time of recording, a microphone is installed on the ears of the dummy
head and recorded, and the reproduced sound is listened to by headphones, so that depth feeling
and It has been considered that a sense of localization can be obtained. The present invention
provides a circuit for converting a conventional multi-microphone signal into a signal that can be
obtained through a dummy head as described above, and will be described in detail below.
Figure 3 is a block diagram of the present invention, wherein Ml is a signal division circuit for
dividing the signal from the microphone m into left and right signal systems so as to change the
division ratio, DIF is one system (for example, left channel) And the other divided signal S2
applied to the input terminal CH2 of the other system (for example, right channel) is applied to
the input terminal CH1 of the A differential circuit for obtaining the signal S2-S (hereinafter
referred to as the signal S /), F1 is a fan that is diffracted and attenuated until it reaches the left
and right ears of the human being when the difference signals S and I are applied. A filter that
obtains frequency characteristics substantially similar to the frequency characteristics as shown
in the figure, D1 is the same as the time difference between sounds applied to the left and right
ears of a human being as shown in FIG. The delay circuit for obtaining a time difference signal
between the signals of one system and the other system, MIX, is applied with signals from this
delay circuit and direct and tangential signals from the input terminal CH1 of the abovementioned -10,000 system. A mixing circuit where signals are synthesized, and CH, 'are output
terminals of this one system provided at the output side of this mixing circuit. Thus, the signal
circuit of one system is configured. On the other hand, also in the signal circuits of the other
systems, the signal division circuit M applied to the input terminal CH2 of this system, the other
signal S2 divided by /, and one of the signal A signal S of a difference from the one signal S1
divided by the signal division circuit M1 applied to the input terminal CH of the second group, 52 (signal s2 ') i to obtain a differential circuit circuit F2, similar to the above A filter F2, a delay
circuit D2, a mixing circuit MIX2 and an output terminal CH2 'of this system which performs the
operation are provided to constitute a signal circuit of another system. The signal dividing circuit
M1 is composed of, for example, a variable resistor, and its adjustment is divided when the sound
source is in the left front as shown in FIG. Adjust so that the signal of the left channel system
becomes strong. M2 is a characteristic variable circuit capable of changing the characteristics of
the filters F, F in synchronization with the change of the division ratio of the signal division
circuit M1, M3 is a delay circuit D1. The delay time variable circuit can change the delay time of
D2 in synchronization with the change of the division ratio of the signal division circuit M1. Fang
7 shows another embodiment of the present invention. Also at the EndPage: 2 ° of the left and
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right signals of a stereo record and juke tape (music tape) already recorded, to the input
terminals of the left and right signal systems of this circuit When applied, the effect of making
the wind sound image spread and sense of depth can be obtained particularly well.
That is, when all movable contacts of interlocking switch SW of this circuit are switched as
shown by a solid line, if only the circuit of the left signal system is described, it is applied to its
input terminal CH, differential circuit DIF, and filter F1. The signal passed through is applied to
the mixing circuit M, while the same signal as applied to the input terminal CH is applied to the
mixing circuit MIX through the delay circuit D + k. Therefore, by delaying the main signal of the
left signal system more than the signal of the difference between the left signal and the right
signal, and likewise, the main signal of the right signal system is delayed more than the signal of
the difference between the right signal and left signal Thereby, a wider sound image localization
can be obtained than the position of the actually arranged speaker. At this time, as indicated by
the interlock switch sw1 solid line, by operating the high-frequency attenuation characteristics of
the filter and the filter in the opposite manner to that before, the sound quality when the sound
image spreads out as described above becomes natural. can do. Still, when all the movable
contacts of the interlock switch SW are switched as shown by dotted lines, a circuit as shown in
FIG. Fang 8 shows an embodiment of recording live performance with a so-called multimicrophone in which a large number of microphones are arranged, using the circuit of the
present invention described above. That is, C8 is the circuit of the present invention as described
above, and the microphone m of this circuit, for example, is disposed in front of the drum. Also,
the microphone m, 'disposed in front of the contra path is connected to the similar circuit C2, and
the microphone m1 n disposed in front of the trumpet is connected to the same circuit On. Then,
the output signals of the left signal system of these circuits 01 to C ゎ are respectively applied 1
and mixed to the mixing circuit MI 1 L of the left signal system, and the output signal is amplified
by the amplifier AMPL and the amplified left Signal is an example. The signal is recorded on the
left channel of the magnetic recording medium (magnetic tape) through the magnetic head H4k
of the magnetic recording / recording apparatus b, while the output signal of the right signal
system of the circuits C1 to Cn 'is a mixture of the left signal systems The mixed signal is applied
to the circuit MIXFL, the output signal thereof is amplified by the amplifier AMPR, and the
amplified right signal is recorded on the right channel of the magnetic recording medium via the
magnetic head HR. When the signal recorded in this manner is reproduced by headphones, as in
the prior art, the localization in the sense of hearing does not occur at the central part of the
head, and a sense of depth and localization can be obtained. Of course, when the signal recorded
as described above is reproduced by the speaker, a sense of reality can be obtained better than in
the conventional stereo reproduction.
The above description is given for the case of converting a signal collected by a microphone into
a signal as if collected using a dummy head by passing through the circuit of the present
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invention. As another usage of the circuit, stereo left and right signals already recorded by the
multi-microphone are directly applied to the input terminals CH and CH2 of this circuit, and the
left signal system and the right signal system are If the output signal is reproduced by a
headphone or a speaker, the left and right spread and depth feeling of the sound image, which
can not be obtained by the conventional reproducing apparatus, can be realized. As is apparent
from the above description, when a signal picked up by an ordinary microphone is applied to the
input end of the circuit of the present invention, the output side of the circuit corresponds to the
left and right ears of the dummy head. It is possible to obtain left and right signals converted like
a so-called dummy head signal obtained from a microphone installed in the inside, and such a
circuit may be provided for each of a large number of microphones (multimicrophones) disposed
in front of a sound source. By mixing the left signal system of the output signals of these circuits
and the right signal system, it is possible to convert the EndPage: 3 multi-microphone signal into
a dummy head signal by mixing the signals. Then, if the signal converted in this way is recorded
on a recording medium (magnetic tape, record, etc.), then it can be reproduced to provide a sense
of presence like when a listener listens to a live performance. . And this reproduction can be
obtained not only in the case of reproduction with a speaker but also in the case of reproduction
with a headphone, with the sense of depth and localization that could not be obtained
conventionally. Moreover, the circuit of the present invention can be used not only as part of a
recording circuit but also as part of a reproduction circuit. That is, in the case of a stereo signal,
the output signal of this circuit, in particular headphones, is applied by applying the left and right
stereo signals to the input terminals of the left and right signal systems without passing through
the signal dividing circuit. Even in the case of reproduction, a sense of depth and a sense of
localization not obtained conventionally can be obtained. When the circuit of the present
invention is used in a reproduction circuit, when listening to the stereo signal with headphones, a
sense of depth and localization not obtained conventionally can be obtained, and thus the panel
of the stereo reproduction apparatus (amplifier) It is convenient to make the circuit of this
invention freely connectable only when listening to headphones by switching the switch mounted
on the switch or the switch that switches automatically when plugging the headphone plug into
the jack mounted on the panel .
Although only the two-channel stereo is described in the above embodiment, it is needless to say
that the four-channel stereo can also be applied by connecting the circuit of the present
invention for each channel.
4. Brief description of the drawings Fang 1 is an illustration of the time difference of sound
reaching human left and right ears, and 72 is an illustration of direct sound and diffracted sound
produced when sound reaches human left and right ears, bruise FIG. 3 is a block diagram of the
present invention, FIG. 4 is an explanatory view of direction division of sound that represents the
direction of sound to be localized, and FIG. 5 is left and right human beings different depending
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on the direction of sound source. Prediction curve of frequency characteristics of sound entering
the ear, Fang 6 figure is a time difference characteristic curve generated by direction of sound
entering human left and right ears, Fig. 2-7 is a block diagram showing another embodiment of
the present invention, Fang 8 The figure is a block diagram illustrating an embodiment of the
arrangement of four microphones and the recording of live performances using the circuit of the
invention. Ml: Signal dividing circuit, CH, CH2: Input terminal of both signal systems, DIF, DIF2:
Differential circuit, FItF2: Filter, D, D2: Delay circuit, MIX , MIX2 ... mixing circuit, CH1 ', CH,' ...
output terminals of both signal systems, M2. -M2 ... Characteristic variation circuit of filter, M3 ...
Delay time variable circuit of delay circuit. Fig. 1 Fig. 2 Fig. 3 End Page: 4 To Fig. 8 (to),-HL
person's name] ζ c-+ HR11, 2 (End): 56, Agent address other than the above Tokyo Chuo-ku
Ginza 8-chome 12-15 no. 6
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