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JPS54109401

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DESCRIPTION JPS54109401
Specification 1. Name of blunt signal converter 3, detailed description of the invention The
present invention relates to the signal converter, in converting a signal having no localization
information into a pinaural signal, the sound field is assumed to be a plane and a plurality of
these are considered. In accordance with which of the divided planes the sound image to be
localized or moved is located, the signal which has been localized at a predetermined position
and delayed in advance is synthesized according to the above binaural signal ( It is possible to
provide a signal conversion device capable of converting and outputting an indirect sound, a
corresponding pie, and a noural signal in a cylindrical configuration, thereby forming a sound
field approximate to an actual sound field. To aim. FIG. 1 is an example t # field plan view for
obtaining a conventional 2-channel binary signal, in which the sound emitted from a single sound
r11 is placed near the binaural entrance of the artificial head 2. The two microphones output the
pinaural signal BR1 to be heard by the right ear from the output terminal 3.degree. And the
pinaural signal BL to be heard by the left ear. By listening with the above-mentioned pinaural
signal BR9BL ? headphones, Wl! The listener sounds as if the sound EndPage: 1 source is
localized at the position shown by 1 in FIG. Fig. 2 is a plan view of an example of a sound field for
obtaining a conventional 4-channel binary signal. A pseudo head with microphones installed on
both the left and right ears narrows the screen 15 as shown in 5.6. The 2 Wi used and the sound
emitted from the sound source 7 ░ 8 is the right front pinaural signal ?RF 'front left pinaural
signal BLF, left rear pinaural signal BLB? right back The binary signal BRB is output from the
output terminals 9, 10 and 11.12, respectively. By listening to these panaural signals with a 4channel headphone, the listener feels as if the sound source is localized at the position + shown
at 7 and 8 respectively in FIG. In the above-described method using a pseudo-head, various
limitations such as the location of the pseudo-head and the sound quality etc. are overcome, and
so localization information is conventionally provided as shown in FIG. 3 or FIG. There is known a
sound image localization signal conversion device which takes no signal (e.g., each channel signal
of multiple channels) as an input signal and converts it into a pinaural signal similar to a digital
signal. In FIG. 5, a signal without localization information such as a reproduction signal of a
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multitrack tape is supplied from the input terminal 14 to the attenuator 15, and after being level
attenuated, a predetermined frequency characteristic is given by the filter 16 .
The output signal of this filter 16 passes through the attenuator 17 and the filter 18 sequentially
and is supplied to the delay circuit 19 having a predetermined delay time, whereby the interaural
difference characteristic of the left 5 of the listener is realized. The attenuators 15 and 17, the
filter 16.18 and the delay circuit 19 constitute a signal converter 20 respectively. The output
signal of the filter 16 and the output signal of the delay circuit 19 are supplied to the combining
circuit 25.24 via the attenuator 21.22. Here, in the actual sound field, as shown in FIG. 1, the
sound propagating from the sound # i1 to the pseudo head 2 (ie, the listener) is directly
transmitted to the listener (from the sound source 1 through a path indicated by A). In the figure,
it can be roughly divided into direct sound propagating directly to the pseudo head 2) and
indirect sound propagating to the listener through a path different from A by reflection as shown
by B and O. Therefore, in order to provide this indirect sound information, a signal not having
localization information received from the input terminal 14 is delayed for a predetermined time
by the delay circuit 25 and then supplied to the synthesis circuits 23 and 24, respectively. It is
combined with the output signal of the signal converter 20. The signal taken out from the
synthesis circuit 25 ░ 24 is respectively led to an output terminal 26. 27 as a pinaural signal
BL1 to be heard by the right ear as a pinaural signal BL1 to be heard by the left ear. These
pinaural signals BR1BL are similar to the pinaural signals output from the output terminals 3 and
4 shown in FIG. 1, respectively. FIG. 4 is a block diagram of an example of a signal conversion
device for obtaining a 4-channel pinaural signal proposed by the present applicant in Japanese
Patent Application No. 50-76954, and the same portion as FIG. 5 is identical The code is
attached. 28 is a signal converter having a configuration similar to that of the signal converter 2o
shown in FIG. 5 and supplies four signals provided with localization information to the synthesis
circuits 55 to A6, where the delay circuit 25 attenuators 29 to 52 seconds. And combine with the
incoming signal. The output signals of the synthesis circuits 55 to 56 are output from the output
terminals 37 to 40 as those converted to the pinaural signals BRF, BLF, BLB, and BRB similar to
the pinaural signals taken out from the output terminals 9 to 12 shown in FIG. Hm. By the way,
when the indirect sound reaches the listener in the actual sound field, the direction of arrival, the
delay time, etc. are naturally different according to each red mark, as shown in FIG. 6 and FIG. In
the conventional signal line device, the signal line branched from the input signal line (?, Is
synthesized by the delay circuit 25 into the signal obtained by the 16th converter 20 ░ 28 by
giving a predetermined delay. It was only
For this reason, in the conventional signal conversion device, indirect sound information is
representatively obtained by only one delay circuit, and delay times are respectively determined
by different paths such as indirect sound in an actual sound field. It is not possible to give
information different from and different in the direction of arrival, and at least with respect to
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indirect sound information, the direction of arrival, the delay time for the direct sound. EndPage:
2 Furthermore, there is a disadvantage that information such as frequency characteristics is
missing. The present invention is intended to eliminate the above-mentioned drawbacks and to
obtain indirect sound information with a simple configuration, and each embodiment will be
described below with reference to FIGS. 5 to 9. FIG. 5 shows a block diagram of the first
embodiment of the device of the present invention. In this embodiment, a three-dimensional
sound field is assumed to be a plane parallel to a plane connecting the listener's ears, and this
virtual plane is left 671 with the listener 41 as the origin as shown in FIG. , Left back, right front,
right back correspond to, LB, RF, RB divided into four. As a result, the sound image to be localized
is present in any one of these divided planes (hereinafter also referred to as quadrants). That is,
in order to obtain an output signal from an existing sound source and a corresponding signal, the
position of the sound image S 'to be localized corresponding to the existing sound source is the
above four quadrants, LF. It is defined by the presence of any of L, R and RB. Therefore, the
sound image S at the position shown in FIG. The switch date shown in FIG. 5 is switched so as to
input a signal having no localization information received from the input terminal 4'2 to the
quadrant delay circuit 44. On the other hand, the signal having the localization information is
given by the signal converter 45 and then supplied to the combining conversion circuits 48 to 51
after being given the desired localization information, where the delay circuit 44 and the delay
circuit 44 It is synthesized at predetermined levels with four different time-delayed delayed
signals. The signals taken out from the synthesis conversion circuits 48 to 51 are output from
the output terminals 52 to 55 as pinofull signals indicated by BLFIBLBIBRFIBRB. The signal
converter 45 is a signal converter having the same configuration as that of the prior art, and is a
pinhole signal that allows the listener to hear if the sound comes from an arbitrary position such
as the sound source 85 shown in FIG. Output In addition, as long as the localization position
moves as long as the position of the audio image to be heard by the listener as an indirect sound
is within the LF quadrant, the switch 8. Is connected to the input of the delay circuit 440, and the
direction of arrival does not change (the same applies to the pond's quadrant), which is given by
this pinofull signal.
However, in practice, the above method is sufficient as indirect sound information, whereby the
circuit configuration can be simplified and simplified as compared with the circuit configuration
for obtaining all delay times and directions of arrival, and compared with the conventional
device. A sound field closer to the actual sound field can be obtained. In the fifth M, 45 and 46,
47 are respectively for the LB quadrant, the delay path for the R1 quadrant, and the delay circuit
for the R8 quadrant. As shown in FIG. 6, four quadrants are obtained as shown in FIG. 6 in order
to obtain a 4-channel pie full signal BLF'BLB '"RF'BRB, like a switch S connected to each quadrant
of RB. It is desirable to divide it into FIG. 7 is a block diagram of the second embodiment of the
device according to the present invention. This embodiment is directed to the pinofull signal
component for providing indirect sound information, such as a change in frequency
characteristics caused by passing through a path such as reflection. It is intended to give
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information as well. In FIG. 7, a signal not having localization information received from an input
terminal 56 is supplied to a signal converter 57 where direct sound information is given. On the
other hand, when the sound image is localized in the quadrant <L, as shown by 8 'in FIG. 8, the
switch S is connected to the delay circuit 5 on the LF quadrant as shown by the solid line in FIG.
Here, the delay circuit 58 for L, quadrant has delay time ? 1. ?2. ..., ?. The delay circuits of
?are connected in parallel, and input signals are ? and ~?. The delay circuit 59 for LB
quadrant, delay circuit 60 for R1 quadrant, delay circuit 60 for RB quadrant, and delay circuit 61
for RB quadrant are respectively described above, and the configuration for quadrant is similar to
that of the circuit 58. Supplies their output signals to the signal converter 57. Now, assuming
that the sound image corresponding to the existing sound source is 8 ░, except for the direct
sound propagating by S, as shown in FIG. 8, virtual sound sources S, ', S2',. It can be considered to
reach the person 41-for example, in FIG. 8, the indirect sound reflected by the P surface is a
virtual sound source day centered on this P surface and in line symmetry with the sound image
St by EndPage: 3. It can be replaced by direct sound that is more directly propagated to the
listener 41. The same can be said of the indirect sound of the pond. Therefore, in the example of
FIG. 8, the signal having no localization information has a predetermined delay time f1 to virtual
sound source S, '+ 82',..., 88 'by the LF quadrant delay circuit 58. r2. .., After being given, it is
input to the signal converter 57, and the direction is divided similarly to the direct sound, the
frequency characteristic, the phase, etc. are changed, and the above virtual sound source S1.
??? The signal + ? J corresponding to SIl is obtained. The signals giving these intermittent
noise information are combined with the signals giving the above direct sound information, and
then the 4-channel signal BLF'Ei, B'1 BRF 'BRB, etc. are output terminals 62.63, It is taken out
from 64.65. According to this embodiment, the signal giving the one-ring sound information also
receives the change of the frequency characteristic, and furthermore, the arrival direction of the
sound to be perceived as an indirect sound constitutes the delay circuits 58 to 61. The number of
delay circuits can be increased to increase the number of delay circuits. In each of the above
embodiments, the number of divisions (quadrants) has been described as four, but this is
determined in consideration of the required performance and cost. Therefore, as shown in FIG. It
may be divided into five parts of LF, R, and B, and may be further divided into five or more parts
if performance is required. Also, as proposed by the present applicant in Japanese Patent
Application Nos. 52-51862 and 52-51863, the characteristics of either the attenuator, the delay
circuit or the filter in the signal converter 45.57 can be varied to Even when the sound image
localization position is moved continuously, the present invention can be similarly applied. As
described above, the signal conversion device according to the present invention assumes that
the sound field is a plane and this virtual plane is The sound localization position of the sound
image to be localized or moved to a position where the sound source is supposed to be present is
divided into a plurality of plane parts whose origin is the position corresponding to the listener,
and these divisions of the sound image radially about the listener Does not have localization
information in a circuit system different from the pinaural signal conversion circuit system
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selectively depending on where in each of the flat surface portions the predetermined delay time
(s) slightly differ for each divided plane portion Since the signal obtained by combining the
plurality of delayed signals with the above-mentioned pinaural signal is separately output as the
final pinaural signal, the above sound source is assumed to be present. Localizing one or more
sound images in a direction different from the first sound image localization position determined
in advance according to the first sound image localization position in the pond of the first sound
image localized Therefore, the listener can perceive the first sound image as a virtual sound
source and can also hear the sound from the second sound image as a dark noise, so that a sound
field approximated by an actual sound field can be formed, and direct sound information In
addition to the above, by using indirect sound information that also gives the direction of arrival,
delay time and frequency characteristics, a pinaural signal similar to the pinaural signal obtained
from a pinaural signal recording sound field using an actual pseudo-head can be electrically The
sound field is divided into a plurality of flat portions, and the change in the arrival direction,
delay time, and frequency characteristic predetermined according to where in the divided flat
portion the first sound image is localized In order to obtain the indirect sound information, it is
possible to perform indirect sound processing on a two-dimensional plane instead of the
conventional one-dimensional "5 contact processing" with a simple circuit configuration
according to the performance of the signal converter. Because of this, it is possible to improve
the pinaural signal recording accuracy of the sound field compared to the conventional one.
It is possessed.
4. Brief description of the drawings. FIG. 1M and FIG. 2 are plan views showing the respective
sides of the conventional f-noraural signal recording system using a pseudo head, and FIG. Fig. 4
is a block diagram of an example, Fig. 4 is a block diagram of an example of a sound image
localization signal conversion device proposed by the applicant or the present invention, and
Figs. 5 and 7 are blocks showing respective embodiments of the device of the present invention.
Fig. 8 is a sound field plan view showing sound field division methods, sound image localization
positions etc. for explaining Fig. 5 and Fig. 7 respectively, and Fig. 9 is another view of the sound
field. It is a sound field top view which shows the division method. 14.42.56 иии Signal input
terminal not having localization information, 20.28.43.57 иии Signal conversion EndPage: 4 units,
26.27.57-40.52-55.62 65: binaural signal output i, 4415 B: delay circuit for Lp quadrant, 45.59:
delay circuit for LB quadrant, 46.60: delay circuit for RF quadrant, 47.61 ... Delay circuit for R8
quadrant, S1, S2 ... switch. Patent applicant Nippon Victor Co., Ltd. Attorney patent attorney
Tadatoshi Ito Fig. 1 Fig. 3 Fig. 4 Fig. 4 Fig. 6 Fig. 9 '1 Fig. 8 EndPage: ?
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