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JPS53141601

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DESCRIPTION JPS53141601
Description or title of the invention
Evaluation method of reverberation characteristics
It is well known that the reproduction state of the stereophonic sound reproduced by the
stereophonic sound reproduction device is greatly influenced by the reverberation characteristics
of the listening room, and therefore, the user of the stereophonic sound reproduction device
Many of them want to know the reverberation characteristics of their own sunning room.
However, since the measurement of reverberation time usually requires the use of a large-flamed
measuring device, even if you want to know the reverberation characteristics of your own
listening room as mentioned above, it is an opportunity to measure it together. Thank you, f! た。
It is the fact that it is difficult to realize the measurement also from the aspect of cost. However,
the reverberation characteristics of the user's own sonning room that the user of the
stereophonic sound reproduction apparatus wants to know are not necessarily so precise
measurement values, and their listening room is for each frequency band. It is sufficient if we can
know roughly what kind of reverberation tendency it shows. EndPage: The present invention
gives the listener at a specific position in the playback sound field formed by two speakers a
stereophonic feeling that is more magnified than the stereophonic feeling that should normally
be given by the actual speaker layout. The effect of expanding the 3D sound field in the 3D sound
field expanding device that is configured to be able to listen. A method of determining a
reverberation characteristic that allows the reverberation characteristic of the listening room to
be easily determined using a three-dimensional sound field expansion device, paying attention to
the fact that it changes according to the size of the reverberation time of the room Hereinafter,
the contents will be specifically described with reference to the attached drawings. FIG. 1 is a
block diagram of one embodiment of the reverberation characteristic determination method of
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the present invention, wherein Sa is a signal generator, blocking is a frequency selective
amplifier, BX is a three-dimensional sound field expanding device, Eta. , 8b is a speaker, M is a
listener, and the above-mentioned signal generator Masuda has an arrangement capable of
generating a signal over a wide band, which may be, for example, a so-called pink noise
generator . In addition, the frequency selective amplifier HA is configured to be able to
sequentially select and amplify a signal of an appropriate frequency band from the signal
generated by the signal generator 8G, which may be, for example, a large number of band-pass
filters It may be composed of a switch, an amplifier and a changeover switch. As the threedimensional sound field expansion device α, for example, the signals of the respective channels
in the two-channel three-dimensional acoustic signal (two-channel stereo signal) are regarded as
individual input signals, and the listener From the setting circuit portion of sound image
localization consisting of two sets of signal conversion devices for converting into a signal in
which a sound image is localized in a direction intended to be localized and from the setting
circuit portion of sound image localization described above The setting circuit portion of the
sound image localization described above such that a signal in the form of a signal similar to the
output signal of is applied as a listener's binaural signal in a reproduced sound field formed by a
plurality of speakers arranged in space. Are connected in cascade with a circuit portion for
converting an output signal from a signal into a signal in the form of a signal in which crosstalk
to be generated in the reproduction sound field has been canceled in advance May be a threedimensional sound field expansion device having a UNA configuration, the - it shows a block
diagram of one example embodiment in Figure 2.
In FIG. 2, 1 and 2 respectively denote input terminals to which each channel signal of 2-channel
stereo system is applied individually, and SX eliminates in advance a crosstalk between the
circuit for setting sound image localization and a circuit circle in reproduction sound field. A
three-dimensional sound field enlarging apparatus configured by cascade-connecting a circuit
portion “x2 (hereinafter referred to as crosstalk elimination circuit portion sX2) for the purpose,
and 3.4 is an output terminal. The sound localization setting circuit portion SX is configured such
that the sound image is localized in the direction intended by the listener to localize each of the
channel signals individually input to the input terminal 1 ° 2. Signal conversion circuits 5 and 6
for converting signals into such signals (pinaural signals). Each portion of H is included, and the
signal conversion circuit 6 is configured to include each portion of blocks 8 and 10-12. In each of
the blocks described above, block 8.11 is an adder, and block 7.10 which is% 1 is Elai in FIG. 3,
and both ears of listener M in the virtual sound field formed by the virtual sound source shown
by 8bi. A transfer characteristic Ai between the virtual sound source Sai and Bbi and a transfer
characteristic M corresponding to the virtual sound source between the listener M and the nearer
virtual sound source in BiO, and a corresponding characteristic A1. , And blocks 9, 12 are the
difference between the two ears of the listener M in the virtual sound field, that is, both ears of
the listener M and the virtual sound source E? The circuits' * 10.9 m12 etc. provided with the
respective characteristics as described above are circuits having the characteristic (10,000)
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corresponding to the ratio (correction) of the transmission Bi 131 characteristics between ai and
Sbi, respectively. It is configured by a filter having a required frequency response characteristic, a
delay circuit (phase shift circuit) having a required time delay characteristic, and the like. In the
W3 diagram described above, reference numerals 8a and 8b denote two speakers (reproduction
sound source) disposed in a space to form a reproduction sound field, and A and B in the diagram
denote two speakers 8a and Sb. And transmission characteristics between the listener and the
listener's ears in the playback sound field. EndPage: 2 The signal conversion circuit 5 shown by
the block 5 in FIG. 2 above listens to the input signal (one of the two channel stereo signals)
supplied to the input terminal 1 in the reproduction sound field. Converts the signal into a signal
(pinaural signal) in which the sound image is localized in the direction intended to be localized,
for example, in the direction of the virtual sound source Sai in FIG. The signal conversion circuit
6 given to the removal circuit portion and indicated by the block 6 also makes it possible for the
listener to reproduce the input signal (the other channel signal of the two-channel stereo signal)
supplied to the input terminal 2 in the reproduction sound field. It is converted to a signal
(pinaural signal) in which the sound image is localized and incorporated in the direction intended
to be localized, and the crosstalk elimination circuit portion Sx2 is give.
The cross-talk removing circuit portion is constituted by a subtractor 14 ° 18 and blocks 13616
* 15-11 each having characteristics as shown in the figure. Note that A and B in FIG. 2
correspond to A and B showing the transfer characteristics between the listener M's ears in the
playback sound field and the playback sound sources Sa and sb in FIG. 3, and T Indicates a delay.
The three-dimensional sound field enlargement apparatus SX provided with the above-described
second illustrated configuration outputs an output signal Lsp to the two speakers & 8b for
forming a reproduction sound field from the output terminals 3 and 4. When Rsp is supplied, it is
possible to give the listener M a feeling of three-dimensional sound that causes the listener M to
feel a sound image localized outside the surface of the speaker base 9. However, the threedimensional sound field enlarging device shown in FIG. The fact that the above operation can be
performed will be described more specifically. As shown in the second figure, in the threedimensional sound field expansion operation system, the characteristics of the setting circuit
portion of the sound image localization and the characteristics of the crosstalk elimination circuit
portion 8X2 are received in the virtual sound field and the reproduction sound field as described
above. The input signal supplied to the input terminal 1e2 is now TjIpi, because it is determined
based on the transfer characteristics between the listener's ears. Rspi, Lep the output signal
appearing at the output terminals 3 and 4. As a Rap, turn on the three-dimensional sound field
expansion device shown in the second figure. The relationship between the output signals is
obtained as in the following α) equation. Incidentally, the binaural signal Rθ of the listener M in
the reproduction sound field. Between the speaker Sb and the signal S1 of the speaker Sb 13a,
and the signal Ti1p of the speaker 13a, the relationship of the above equation (2) holds, α). (2)
from equation [=] = Nishizu] · Zhan 2 "-n ':' 4 Yutaka [= Minister · · · C (3) is obtained. Here, the
following equation (5) can be obtained by modifying the equation G) using the relationship of l
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(AB) = (AB) ratio, (4) ABBABA (4). e [T]-T · [BiAi] · [beam +] (5) The above equation (5) is a
binaural signal obtained by the listener M in the virtual sound field, and the second It is shown
that the output signals Rsp, I, spf of the circuit arrangement shown are equal to the binaural
signals obtained by the listener M's ears when given to the speakers 8b, 8a in the narrow
arrangement, and hence the second illustration It can be seen that the circuit arrangement of the
configuration as described above operates as a three-dimensional sound field expanding device.
The conditions for performing the desired three-dimensional sound field expansion operation of
the second illustrated three-dimensional sound field expansion device 8X are as shown in the
above-described respective expressions, but are included in the above-described respective
expressions. The values of the transfer characteristics A, E, Ai, Bi, etc. vary according to the
reverberation characteristics of the listening room in which the two speakers sa, s' b are
arranged, and the values of the listening room The listener M who is at a predetermined position
with respect to the two speakers Be and gb comes to sense that the degree of expansion of the
three-dimensional sound field decreases as the remaining time becomes longer.
Therefore, in the reverberation characteristic determination method of the present invention
illustrated in FIG. 1, reverberation occurs when signals of different frequency bands are
sequentially input from the frequency selective amplifier SA to the input terminal 1.2 of the
three-dimensional sound field expansion device. The listener M who is at a predetermined
position with respect to the two speakers Sa and Sb arranged in the listening room to be
subjected to the determination of the characteristics corresponds to the input signal to the abovementioned three-dimensional sound field expansion operation release By knowing which part of
the range between the position of the speakers 8a, 8b and the lateral direction of the listener M
and EndPage: 3 can sense the localization of the resulting sound image 1 For example, the
reverberation time in which frequency range of the listening room It is easy to determine the
reverberation characteristics, such as long (or short) or others. As a three-dimensional sound
field expansion apparatus, for example, for a listener located at a specific position in a
reproduction sound field formed by two speakers disposed in a room with little reverberation, a
sound image corresponding to an input signal is heard by the listener M In the case of a
characteristic that can be perceived as a sound signal localized to the sideways direction of, the
sound signal corresponding to the input signal is localized to the sideways direction of the
listener M for a short frequency band of reverberation time As for the frequency band in which
the listener M is sensed and the reverberation time is remarkably large, the listener M is sensed
by the listener M as the sound image corresponding to the input signal is localized at the position
of the speakers Sa and Bb. In the case of about the middle of each of the above cases, the sound
image corresponding to the input signal is localized at the middle part between the positions of
the speakers 8a and B'b and the lateral direction of the listener M, and the reverberation is
Senses Susumuzo, also as reverberant, the listener senses a sound image was localized speaker
Sa, the position of the Sb closer. As described above, in the reverberation characteristic
determination method of the present invention, reverberation characteristics in different
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frequency bands in the diameter of the listening room can be easily determined with an
extremely simple configuration, and according to the determination result by the present
invention method By adding a sound absorber or reflector, it is also easy to create a listening
room with an effective remaining 1% a.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a reverberation
characteristic determination method of the present invention, FIG. 2 is a block diagram of an
example of a three-dimensional sound field expansion apparatus, and FIG. 3 is a virtual sound
field and a reproduction sound field. It is explanatory drawing of the transfer characteristic
between a sound source and a listener's both ears. Field signal generator SA frequency selective
amplifier α. Three-dimensional sound field expansion device, Sa, 8b · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · Patent applicants Nippon Victor Co., Ltd. Attorney Takeshi Ima 1 ° EndPage: 4
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