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JPS5431702

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DESCRIPTION JPS5431702
Specification t Title of the invention Pinaural stereo reproduction circuit tape A mixing circuit for
mixing left and right channel signals reproduced from a disk or a disc, and a bypass filter for
removing the non-local wavenumber component of the output signal of the mixing circuit A delay
circuit for delaying all the output signals of the bypass filter, and an output signal of the delay
circuit? "F: A pinaural stereo regeneration circuit characterized by having a circuit constituted by
an attenuator to be attenuated and a mixing circuit for mixing the output signals of all the
attenuators with the original signals of the left and right channels.
2, the scope of claims
5. Detailed Description of the Invention This invention is a pinaural recorded sound balance, an
apparatus for processing and reproducing headphones, a corner chippanal stereo reproduction
apparatus such as a radio cassette, a portable tape recorder, a stereo instep preamplifier, etc.
When you listen to 0 binaural recorded sound that is related to the live circuit with headphones,
the sound source is diagonally Z (when the sound time difference between the sound incident on
the left and right ears and the sound pressure level difference Direction of sound source ???
Can land, but sound hot water is in the median (both ears? Passing through the middle point of
the connecting willow and perpendicular to that line)) ie in front. When it is above or behind, the
arrival time difference and the sound pressure level difference of the sound incident on the left
and right ears are "at zero, so it is possible to recognize where the sound source is in the median
plane t &: Yes. Therefore, if a panaural sound is produced by headphones, the appearance of a
panaural stereo reproduction device that can not be localized outside the head of the forward f
image and can be localized outside the head of the forward sound image is hopelessly frozen ing.
Heretofore, as such an apparatus, there is a reproduction apparatus for artificially imparting
reverberation P to a source to give a sense of distance, and the main subject of this apparatus is
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the late research 11 path 0 this apparatus The effect is recognized to some extent forward fH #
out-of-head localization, but the remaining ? sound balance is added to the source, so the sound
quality becomes small P 01 09, originally it is not necessary to add ? 1 l sound Lateral EndPage
: Reverberation sound for one direction or backward eyebrow image? Added. I give up, I have
strong localization problems only for the front sound image. It is almost the same as the case
where no comment is made, and as a result no reverberation is added. . The present invention
was made in order to solve the problems described above, and it is an object of the present
invention to provide a pinaural stereo reproduction circuit capable of localization of a front
sound image. In order to achieve this object, according to the present invention, a mixing circuit
for mixing left and right channel signals reproduced from a tape or disk, a bypass filter for
removing low frequency components of the output signal of the mixing circuit, and ... A delay
circuit for delaying the entire output signal of the bus filter, an attenuator for attenuating the
output signal of the delay circuit, and a mixing circuit for mixing the output signal of the
attenuator with the original signal of the upper left and right channels The circuit to be In socalled live rooms where the sound pressure level of the reflected sound is relatively large, we
know the front, the top and the back. The reason is that it is presumed that the human ear can
distinguish between, for example, the back pressure frequency characteristics of the abovementioned reflected sound and the sound pressure frequency characteristics of the direct sound,
and can be heard by comparison 0 there. When there is a sound source, the above-described
circuit adds pseudo-reflected sound to the left and right original channel signals.
That is, when a sound source is present in the median plane of human beings +1 tlJ, the
frequency components of the sound wave stagnation incident on both ears are in phase. A sound
wave incident on a human being in an oblique direction ? has some components that have the
same phase, but the phase will not be aligned with most of the components. Mixing the signals of
the left and right channels to be reproduced, the output of the mixing of the sound wave incident
on the median plane of human being from an oblique direction has a high probability that its
amplitude is larger than the output of the mixing of the nine sound waves. . Therefore, the left
and right channel signals to be reproduced by a tape recorder etc. are mixed, and a sword is
passed through a bypass filter 2 to cause a component vacancy of, for example, 2 kH2 or more to
generate a time delay which is this signal ? through a delay circuit. After setting the level of the
original signal output from the tape recorder to a low level through the attenuator, this signal is
mixed with each of the original signals of the left and right channels. Further, pseudo-reflected
sound having a certain time delay and amplitude level difference is added to the original signal
when the sound source is present mainly in the median plane of a human. Is the original signal
with this pseudo-reflection sound a power amplifier? It is supplied to headphones via The
embodiments of the present invention will be described in detail below. FIG. 1 is a block diagram
of a pseudo reflection sound addition circuit of a pinaural stereo reproduction circuit according
to the present invention. In FIG. N, reference numeral 1 denotes a terminal joined to the left
channel output terminal of a preamplifier system such as a tape recorder or a record player, and
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a terminal joined to the right channel output terminal of 2?. The signal output from the tape
recorder etc. is recorded by a sound collection device in which microphones are attached to both
ears of a so-called dummy head (pseudo human head). The right channel signal and the right ear,
the left channel signal Corresponds to a constant signal recorded by the left ear. ?????
Singlo path, 4fl bypass filter, delay circuit for delaying src signal, 6 is an attenuator for delaying a
constant signal which is delayed, and 7.8 is an output of attenuator 6 respectively? A mixing
circuit to be mixed with the original signal, 9.10 'is an output terminal connected to the power
amplifier, and the operation of each component will be described. The output signals of the left
and right channels of a tape recorder or the like are mixed in the mixing circuit 3. Among the
input signals of the mixing circuit 3, the amplitude level increases by b dB after being mixed with
the signal component in which the phases of the left and right side channel signals are in phase.
Therefore, the signals of both left and right channels are attenuated by 6 dB and mixed together.
In this way, the left and right channels of the in-phase signal component in the mixed signal have
amplitudes. It becomes the amplitude and direction level of the original signal. Also, right and
left. If the signals of both channels are out of phase with each other at EndPage: 2, the signal
level of the mixed signal should not be lower than the original signal level. ????? The signal
from the mixing circuit 3 has the same width level as that of the original signal when the phases
of the left and right dual channels are in phase, and the selection error is small as the phases of
the left and right channels are out of phase. . The amplitude becomes zero when the phase is
reversed. Is the bypass filter 4 a frequency component of about 2 kHz or more of the above
signal? It is a filter that can be passed through, and it has a freeze of 0, and the average distance
between human ears is about 15C! In the case where sound waves are from the direction in
which both ears are connected, the frequency is in the opposite lL phase with both ears, and
there is no frequency that is in the opposite phase at about 1 kHz or less. Since the amplitude of
the signal output from the circuit 3 does not change significantly, the frequency component of
about 1 kHz or more is removed by the bypass filter 4 0 Characteristic of the bypass filter 4 ?
? FIG. As shown in Fig. 1, the output signal of the bypass filter 4 becomes -sdB with respect to
the level of the cycle ih higher at 2 kHz yr-, and attenuates by -6d, B / octf, and 1kH2TF'l- 9 dB!
???? ????? In the relationship 1 between the signal through the bypass filter 44 and
the direction of the sound source, as shown in FIG. Is the phase difference of all frequency
components of the incident sound wave zero, and the signal after four bypass filters have a signal
component of about 2 kHz or more possessed by the sound source? If you have all vcrl direction
9b direction, ie 45 ░ diagonal direction force, when ? sound wave is incident rtt is the distance
between sound waves incident on each of the both ears when the tone is sufficiently far If it is 15cIn, it will be 106 steel (in fact there is a diffraction effect of the main part and an effective
baldness will be 5, but here is a value obtained from the distance between two ears for
simplicity)? The frequency at which the phase difference of sound waves incident on both ears at
this path length difference is ?, that is, the reverse phase is 1.6 О (2 n ?1) A: Hz (y + = 1.2, 5- =
ии) ? Since the signal passed through four bypass filters is 0th order with t ? ?, the frequency
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of the signal in the vicinity of these frequencies is also smaller because the amplitude is smaller
in the 01th order in which these frequency components are removed from the original signal.
When comparing and listening when there is a sound source in the direction of the signal fa that
has passed the bypass filter 4 and when there is a sound source in the b direction, the loudness
becomes smaller in the case where there is a sound source in the b direction 0 If sound waves
are incident in the C direction, that is, in the lateral direction, the path length difference between
both ears is fifteen, so the frequency pH at which the phase difference of the sound waves is ?;
J1.
??????????????? ???? ...), And as in the case where there is a sound
source in the b direction, the signal that has passed through the bypass filter 4 has its original
signal sword, these frequency components removed. . Next, the operation of the delay circuit 5
will be described. In the delay circuit 51'j, all the signals passed through the bypass filter 4 are
delayed. In addition to this, these circuits all pass through the signal as a reflection of the original
signal. ???????? The delay method is, for example, a signal delay of 20 m3, an
attenuation of 5 ct B, a further delay of 10 m, and a J delay, and this signal t is added to a signal
delayed initially by 1 c 20 ms. Thus, a signal delayed by 20 m5 and a signal delayed by 50 m5
are superimposed to obtain a ratio signal. In the first delay mj, the variable VC is set to 20 m8
and 40771. ? i may be selected. When the initial delay time is 4077 is (signal 75: 4 nms delayed,
50 m3 delayed and 3 dB Bib @ ? superimposed) is obtained. The constant signal passes through
the delay circuit 5 and is attenuated by the attenuator 6, and the tap number t is 2e and 9.12 dB,
which is selected by any one. Attenuator 6 All-pass t @ is the signal of the left channel and the
right channel of the tape recorder etc by mixing circuit 7.8 respectively. Mixed with More delay
time and attenuation due to the above circuit thread. It can be made to be an original signal TL,
that is, a signal that has been waiting for an elephant ???, that is, a false reflection sound.
Force, also the same as the frequency component of about 2 kHz or more of the signal of the
sound wave incident on the frontal direction of human beings, to the pseudo reflection sound.
There are several Rus. Hereinafter, the effect of the present invention will be described. The
circuit configuration according to the invention of EndPage: 3 can add false reflection sound of a
signal having a phase in phase among sound waves incident on human ears. Then, when the
common phase is in phase, the sound source is present in front of, above, or behind the human
being, that is, in the median plane. In this process, if the sound source is present in the median
plane, the pseudo-reflected sound is equally added to the original signal, but for example, if the
sound source is present in the front direction, the sound source is present correctly in the front
direction. Human beings can recognize things empirically. Below, FIG. Figure 5? Why use it?
explain. @ 4 Ad The sound source S 1 above the sound source S 1 in the front of the room S 1.
The direct sound l) 1) 1. each of the sound sources S on the rear of the head S 1 A, Da appear to
be incident?
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It is shown. ?? Also, FIG. 4B, C show the respective sound sources S, S, S. The sound wave
emitted from the side wall is reflected by the side wall, and the reflected sound R,. Of course, it is
difficult for the human body to be difficult to hear from all directions, but here ? 1 focuses only
on the reflected sound that is incident on the lateral force and both ears. . Note that, as shown in
FIGS. 4B and 4C, regardless of the direction of the sound source, there is a sound wave incident
on the lateral force ? both ears. Although the characteristics of the sound source itself differ
depending on the material of the wall in the characteristics of the reflected sound, the sound
pressure frequency characteristics of the sound source and the sound pressure frequency
characteristics of the reflected sound are compared with each other in normal and high
frequencies. It will be similar. The sound pressure frequency characteristics on the eardrum of
the ear of the reflected sound incident on one of the two ears from the substantially lateral
direction are shown by the characteristic curve Re of FIG. On the other hand, the sound pressure
frequency characteristics of direct sound, n, and Dj are similarly shown in FIG. @ 5 Figure
Swords) As it is clear, the level of the reflected sound R1 is the highest at about 5 kHz or more,
and the direct sound l) I. The levels are lower in the order of D, D. That is, the direct sound D1 is
the closest to the reflected sound R1, the direct sound, and the level difference g5 kHz or more of
the reflected sound R1 reaching about 10 dB 0 Thus, the reflected sound R1 and the direct sound
physically differ from each other There is almost no reflection iR1 and [ontone D! (1) The
difference becomes larger as the reflected sound R1 and direct tI become easier. Are these
human differences? It is thought that you can distinguish and hear. The reason is that the
reflected sound does not have to be a direct sound, but it has all the time differences. As
described above, in the binaural stereo reproduction circuit according to the present invention, if
the pseudo reflection sound with less difference between the sound wave from the front and the
frequency characteristics is added to the original signal of the left and right channels, There is no
difference in the characteristics of the @ onomatopoeia and the pseudo eupective reflection from
the direction? : Makes the listener aware and enables forward sound image localization. Due to
this, the effect of the present invention is remarkable 0
4. Brief description of the drawings FIG. 1 is a block diagram of a pseudo reflection sound
addition circuit of a pinaural stereo reproduction circuit according to the present invention, and
FIG. 2 shows characteristics of noise reduction of the pseudo reflection sound addition circuit.
Direction of sound source in figure, figure 3? Shown in FIG. 4 is a state in which the direct sound
2 reflection sound is incident. FIG. 5 is a view showing the sound pressure frequency
characteristic of the direct sound 9 reflection sound in FIG. 5. ... mixed circuit. 4 ииииииииииииииииииииииииииииии!
circuit. 6 ........... attenuator, 7,8 ............... Mikushingu circuit 0 Attorney Attorney thin 1)
Togikarashi EndPage: 4Yubinbango1 Figure f2 Figure ? (*)-1 x)? 3 fig. M-1 и 5 cm '1 1 1 1 l = 4?
5 figures for 5L Maki [Hz] EndPage: ?
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