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JPS62295598

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JPS62295598
[0001]
3. Detailed Description of the Invention [Industrial field of application] The present invention is a
natural listening similar to the original acoustic listening in a wide space such as a concert hall
etc. when reproducing the sound in a small room such as a listening room The present invention
relates to a method of reproducing sound in a realistic manner so that a sense can be obtained.
[Prior Art] Comparing the sense of listening and the physical quantity related to it, ■ ■,
presence / sense of spread-lateral component ■, richness of sound / loudness of sound → initial
reflection energy ■, forward localization / balance -Front-to-back ratio ■, Clarity · Clarity ■,
Sound reverberation · Reverberation time ■, Sparkle / High-low range / Mid-range ■, Bass
feeling-Low-range / Mid-range, These physical quantities are specific listening It is effective in
evaluating the psychological acoustic listening window at the position, and under the condition
that the listening place is constant, all of the transient characteristics, steady-state characteristics
and directivity of the sound field are w4. In recent years, a variety of methods have been
considered, which are called surround as an attempt to give a sense of reality rich in auditory
sense. The main way is to give it a feeling of being trapped in the sound. This is a method of
installing the speaker not only in front of the listener but also behind it. Specifically, the sound
signal to be supplied to one or a plurality of rear speakers (J4 is, for example, a signal obtained
by delaying the left and right sounds from the front in consideration of -1-physical note, or its
left and right It is reproduced as a signal of the difference of the sound of, or the like, and further
as a signal combining a single physical quantity. However, as shown in FIGS. 4 (a) and 4 (b), in
this surround revisit, the reproduction sound from the front speaker 41.42 and the reproduction
sound from the rear speaker 43 are substantially opposite to each other. The various physical
quantities described above are adjusted in consideration of collision so that the listener A has a
good sense of listening, that is, a feeling of being enveloped in sound. Therefore, the sound field
heard by the listener A is a sound field (two-dimensional sound field) formed by the sound from
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the front and the sound from the back, and compared to the original sound field in a wide space
such as a concert hall. One more improvement was desired. [Object of the invention] The object
of the present invention is to provide a sound reproduction method in which the listener can be
surrounded by a three-dimensionally considered sound field so that sound field reproduction
closer to the above-mentioned original sound field can be performed. It is. For this purpose,
according to the sound reproducing method of the present invention, at least two channels of the
original sound are emitted backward by the front left and right speakers in the room, and at least
the delayed original sound or the two channels of the original sound In order to emit the
produced sound signal from the rear speaker in the room, the rear speaker is provided on the
surface where the center extension line in the sound emission direction includes the center
extension lines of the left and right speakers. It is arranged and arranged in a relationship which
is in a substantially vertical relationship, and in a relationship above the target surface.
The listener's listening position is desirable near the surface. EXAMPLES Examples of the present
invention will be described below. FIG. 1 is a diagram showing an example of the sound
reproduction circuit. 1.1 'is an input terminal to which R channel audio signal and 7 channel
sound signal are input, 2.2' is a buffer, and 3.3 'is a delay time adjusted by a control pulse applied
to control terminals 3a and 3a' It is a delay circuit that can 4 is an (L + R) addition circuit that
adds the output signals from the delay circuit 3.3 ', 5.5' is a buffer, and 6.6 'is a delay circuit that
delays the output signal from the buffer 5.5'. The delay time can be adjusted by control pulses
applied to the control terminals 6a and 6a '. 7.7 'is an echo circuit, and one echo circuit 7 is
composed of a mixer 71.72, a delay circuit 73, and a gain adjustment circuit 74.75 for setting the
output level below the input level, and the output signal from the delay circuit 6 And the signal
from the gain adjustment circuit 75 are mixed (added) by the mixer 72, the output thereof is
delayed by the delay circuit 73, the output thereof is level adjusted by the gain adjustment circuit
74, and the output thereof is output of the delay circuit 6 by the mixer 71. A part of the output of
the gain adjustment circuit 74 is input to the gain adjustment circuit 75 and is repeatedly mixed
with the first signal by the mixer 72. Therefore, the desired reverberation can be added by
adjusting the gain of the gain adjustment circuit 74.75 by the control signal applied to the
terminals 74a and 75a, and adjusting the delay time of the delay circuit 73 by the pulse applied
to the terminal 73a. it can. The reverberation time interval is preferably, for example, about 100
m to about 5 ms. Since the other echo circuit 7 'has the same configuration, R1 and R1 of the
same reference numerals are used for the same components. If the control pulses to the
terminals 73a and 73a 'of the delay circuit 73.73' are stopped, a sound without reverberation is
produced. A sound quality adjustment circuit 8 adjusts the frequency characteristics manually by
using an output signal from the echo circuit 7.7 ', and is adjusted to cut a component of 10 KHz
or more, for example. Note that the sound quality may be adjusted by a control signal to the
terminal 8a so as to change the cut component according to preference or to make it cut-out. An
addition / subtraction circuit 9 subtracts the two input signals output from the sound quality
adjustment circuit 8 at an appropriate ratio for addition / subtraction or outputs the result as an
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R signal, and is switched by a control signal to the terminal 9a. 10 is a (L-R) subtraction circuit
that subtracts the output signal from the echo circuit 7.7 ', 11 is a low pass filter that extracts a
component of 7 KHz or less from the output signal from the subtraction circuit 10, 12 is a noise
removal circuit .
VRI to VR6 are interlocked variable resistors for adjusting the volume, VRI for the front L
speaker 21, VH2 for the front R speaker 22, VH2 for the front center speaker 23, and VH2 for
the rear center speaker 24 , VH5 I of the rear. The speaker 25 and the VH 6 are for the rear R
speaker 26. Although the delay circuits 3.3 ', 6.6' and 73.73 'described above can be configured
by BBDs (packet bridge devices), they can also be configured as charge coupled devices (CCDs). It
is also possible to use However, in the case of using this COD, for example, the input signal after
Hassock 2.2 'is modulated at a high frequency and delayed by COD, and then it is converted to a
low frequency component by a circuit prior to circuit 4.8.10. It is necessary to demodulate. On
the other hand, among the above-mentioned speakers, the front speakers 21 to 23 are installed
with the direction of sound emission directed backward (in the direction of the listener A) in the
front as usual as shown in FIGS. However, all of the speakers 24 to 26 are installed downward
with the sound emission direction substantially vertical at the upper side or the upper rear side
of the listener A. Then, the rear speakers 24 to 26 are attached, for example, as shown in FIG. 3
fa), by suspending and fixing them to the L metal fitting 28 fixed to the wall surface 27 with a
screw or the like or attaching by suspension. Also, as shown in FIG. 3 (b), it can be suspended
from the ceiling 29 with a hanging bracket 3.degree., And further, as shown in FIG. It is also
possible to mount the sound portion in an open state and attach it to the wall surface 27.
Furthermore, the rear speakers 24 to 26 may be embedded in the ceiling surface. The audio
signals of R and L channels applied to the input terminal 1.1 'are delayed by the delay circuit 3.3'
and input to the variable resistors VRI and VH2 and reproduced by the front speaker 21.22. 4 to
be added to the variable resistor VR3 and reproduced by the speaker 23 at the front center.
Therefore, if the delay time of the delay circuit 3.3 'is made different, for example, in the case
where the listening position of the listener A deviates from the center on the bisector passing
through the middle of the side speakers 21 and 22. It is possible to compensate for the time
difference based on the difference in the reach of the sound from the side speakers 21 and 22. At
this time, the sound from the speaker 23 at the center is a signal of L + R, and compensation of
the deviation of the listening position is also performed on the regenerated bone from here.
The delay circuit 6.6 'at the latter stage is for the audio signal reproduced by the rear speakers
24 to 26, and by setting the delay time here, it is possible to adjust the surround sound from the
upper rear side. For example, when the listening position is deviated as described above, a
difference is made in the delay time by the delay circuit 3.3 'of the previous stage described
above, and the signal is not delayed in the delay circuit 6.6' of the subsequent stage. , F)
adjustment of time difference between L and R is performed only by the delay circuit 3.3 'of the
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previous stage, in this case, as long as the listening position is at the center between the front
and the rear, There is no time difference in the sound reproduced by the speakers of each other.
However, when the same delay time is provided in the second stage delay circuit 6.6 ', in addition
to the above-mentioned phase difference between 7 and R, a time difference between the front
and the rear can be made. Furthermore, when the delay time of the delay circuit 6.6 'is made
different, the sound reproduced from the rear speakers 24 to 26 becomes different from the
sound reproduced from the front speakers 21 to 23 and the phase difference It will have a time
difference. In particular, with regard to the smoothing component reproduced by the speaker 24,
correction can be performed when the listening position is shifted from the center. In the echo
circuit 7, the first arriving sound signal is mixed with the sound signal after the delay time set by
the delay circuit 73 by the mixer 71 via the mixer 72, the delay circuit 73, and the gain
adjustment circuit 74, thus The first echo of the sound signal becomes an echo attenuated only
by the gain adjustment circuit 74 compared to the original. The second echo passes from the
second gain adjustment circuit 75 to the mixer 72, the delay circuit 73, and the gain adjustment
circuit 74 and reaches the mixer 71, so that the same time delay as that of the first signal is
obtained. It is also greatly attenuated. The third and fourth shots have more delay and
attenuation. And since this action is performed in a complicated manner, it becomes possible to
add a desired echo. Then, by appropriately setting the delay time of the delay circuit 73 and
setting the gain of the gain adjustment circuit 74.75, echo sound matched to the actual hole can
be realized. The same applies to the other echo circuit 7 '. The echo circuit 7.7 'can also be
delayed only once. In this case, the circuit 72.75 may be omitted or the output of the circuit 75
may be made zero by the control signal to the control terminal 75a. When echo is not applied,
the control pulse of the control terminal 73a of the circuit 73 is stopped to make the output of
the circuit 73 zero or to decrease the gain of the circuit 74 to output the signal to the circuit 71.
You can stop it.
These need to be performed similarly for the other echo circuit 7 '. The circuits from the
subtraction circuit 10 to the noise removal circuit 12 process signals T, -R. Here, the in-phase
components of the I and channel components of the output signal from the echo circuit 7.7 ′
are canceled out, and the high frequency component of the echo from the wall etc. is largely
eliminated in the actual hole. As appropriate, high frequency components are cut by the low pass
filter 11 and components from which noise components have been removed by the noise
removal circuit 12 are reproduced from the rear center speaker 24. Therefore, a complex
reverberation sound is reproduced from the rear center speaker 24. This reverberation sound is
a mixture of a plurality of sounds reflected by the back surface in the hole or the wall of the F
surface etc. in a multi-pass manner. It becomes a sound. The tone control circuit 8 attenuates the
high frequency component of the output signal from the echo circuit 7.7 ', for example, cuts the
component of 1OKIIz or later and sends it to the addition / subtraction circuit 9. Note that the
sound quality can be varied or not adjusted according to preference. At two outputs of the
addition / subtraction circuit 9, a signal obtained by subtracting an appropriate amount of signal
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components of both channels, such as αL-βR1αR-βL, is obtained. α and β are coefficients,
and α ≦ 1 and β ≦ 1. Therefore, in the case of α-1 and β-O, the signal components of 7 and
R are obtained separately, and in the case of α-0 and β-1, the channel is inverted as in -I7 and R. Signal components are obtained separately. With the above rear side speakers 24 to 26, L
channel sound from the front and R channel sound are reflected in the hall and indirect sound
that has undergone various deformations in phase, time, level, route and frequency. It is
reproduced as a pseudo sound and becomes a surround sound. Since the rear speakers 24 to 26
are located behind and above the listening position of the listener A, the rear speakers 24 to 26
are emitted from the front speakers 21 to 23 as shown in FIG. 2 fa) and fbl. The traveling
direction of the lapping sound and the traveling direction of the sound emitted from the rear
speakers 24 to 26 intersect each other almost orthogonally. Therefore, a three-dimensional
sound field is formed in the space including the listener A, and the sound field becomes a
reproduced sound field similar to the original sound field generated in a concert hall or the like,
and the surround effect becomes extremely good. In the above, the echo circuit 7.7 'can be
inserted at a position immediately after the delay circuit 3.3' or at a value immediately after the
delay circuit 6.6 ', and in the case of the former, the rear side speaker The echo effect is applied
not only to the playback sound from the speaker but also to the playback sound from the front
speaker.
[Effect of the Invention] From the above, according to the present invention, there is a feature
that a more natural sound field very close to the original sound field in a concert hall or the like
can be generated.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a view showing an example of the arrangement of speakers in the embodiment of the
present invention, and FIG. 2 is a plan view of a listening room (bl is the same side view). Fig. 3
(al-(C) is a mounting explanatory view of a rear speaker, Fig. 4 is a view showing an example of a
conventional speaker arrangement, (a plan view of an al swing room, Fig. 4 (b) is a side view
thereof.
1.1 '... input terminal, 2.2' ... buffer, 3.3 '... delay circuit in the previous stage, 4 ... addition circuit,
5.5' ... buffer, 6.6 '... Delay circuit of the latter stage, 7.7' ... Echo circuit, 8 ... Sound quality
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adjustment circuit, 9 ... Subtraction circuit, 10 ... Subtraction circuit, 11 ... Low pass filter, 12 ... · · ·
Noise removal circuit, 21-23 · · · front speakers, 24-26 · · · rear speakers. Attorney Attorney
Attorney Nagao No. 8 Figure 24.25, 26
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