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Description 1, title of the invention
Reverberation method for stereo transmission
3. Detailed Description of the Invention The present invention relates to a reverberation adding
method in stereo transmission in which a natural indirect sound is given to a listener. Fig. 1
shows the contents on page 02-7 issued by the present applicant of the present applicant, in
which the sound image during headphone reproduction has already been localized outside the
head so that it can withstand long-term use. , 1 is an echo time pattern generator composed of a
delay circuit and a feedback circuit, 2.3 is an attenuator, 4 and 6 are phase shifters, 6 and 7 are
mixers of direct sound and indirect sound, 8 is a human A simulation device for the head and
pinnacle, 9110 are headphones, 10 is a human, and 11 and 12 are input terminals. In order to
localize the sound image out of the head, it is necessary to generate an indirect sound and
electrically mix it directly with the sound. However, in the configuration of FIG. 1, it is a
disadvantage that the element of indirect sound generation is a monaural signal obtained by
mixing two channel signals. This is because such a thing is considered as a phenomenon that can
hardly occur in the real world. Therefore, for example, the same amount of indirect sound is
generated in each ear of the listener with respect to the sound source in the left direction, and a
phenomenon such as streaks occurs, which causes the listener to have a sense of discord.
Propose □ to be a child. EndPage: Page 13 Figure 2 shows an example where the sound source
in the real world is on the right side of the light source 013 is a sound source, 14 is a listener, 16
is a left ear, 16 is a right ear, 17 is a reflecting wall of a room It shows. In addition, ALtBI and
eELeFL are the first reflected sound, left ear incident sound, AR, BR, ER, FR are the first reflected
sound, right ear incident sound, CL, DL are the second reflected sound, left ear CR 9 DR indicates
the right ear incident sound in the second and second reflected sounds, OL indicates the left ear
incident sound in the direct sound, and OR indicates the right ear incident sound in the direct
sound. The sound wave generated from the sound source 13 is reflected by the sound wave
0R9OL directly reaching the listener and reflected by the reflecting wall 17 of the room only
once to reach the listener AR9AL "BR" LeER9 ELe'R1 FLs reflected twice more by the listener Can
be classified as sound waves that reach OR, CX, DR, DL, and more. In FIG. 2, the sound wave ALFL entering the left ear 15 is indicated by a solid line, and the sound wave AR = FR entering the
right ear 16 is indicated by a seven-dot chain line. FIG. 3 shows an example of an echo time
pattern in the right ear. As the time advances with the time when the direct sound 0 reaches the
image, the second reflected sound F appears, and the third or higher reflected sound G appears.
Thus, it can be seen that the level decreases as energy is absorbed by the reflective wall as the
number of reflections increases.
Table 1 below shows values (dB) of attenuation to direct sound in the case of decreasing 1 odB
(0.1 sound absorption coefficient) per reflection of the reflecting wall in the case of FIG. In
addition, it is understood from the comparison of O (hereinafter referred to as margin) on page 6
where the decrease due to the head diffraction is 10 dB (Table 1). The left ear has a larger
attenuation than the right ear. As described above, when the indirect sound source direction is
not front but right or left, it is necessary to increase the amount of indirect sound in the direction
opposite to the sound source direction, for example, when the sound source direction is right, the
left direction. I understand that there is. The present invention relates to a reverberation adding
method based on the above idea in a system regenerating a stereo source, and is effective not
only for an ordinary stereo source but also for a binaural source as an input signal. . FIG. 4 shows
the case of headphone reproduction according to an embodiment of the present invention. In FIG.
4, 18.19 is an echo time pattern generator composed of a delay circuit and a feedback circuit,
20.21 is an attenuator, 22 and 23 is a wave phaser, 24.25 is a mixer, and 26.27 is a mixer. A
mixture of direct sound and indirect sound 1iJ1.28.29 is a headphone, aO is a human, 31, a2 ·
are input terminals. That is, after the signals from the input terminals i 31 and 32 are added to
the EndPage: 27 page, respectively, to the echo time pattern generator 18. 19 and branched, the
branched one signals are respectively added to the attenuator 20. 21. Each other signal is applied
to the phase shifter 22.23, and the output of the attenuator 20.21 is in each case the phase
shifter 23. . 22 is a method for generating an indirect sound by mixing with the signal from the
input terminal 31.32 after being respectively mixed with the signal through the 0. 0 FIG. 5 is a
speaker reproduction according to another embodiment of the present invention. The same
reference numerals as in FIG. 4 denote the same parts. In FIG. 5, 33.34 is a speaker. According to
the above-described reverberation adding method of the present invention, a listener can be
given a natural indirect sound both in headphone reproduction and speaker reproduction, and
can enjoy a more realistic sound compared to the prior art it can.
4. Brief description of the drawings. FIG. 1 is an electrical block diagram of a headphone device
according to a conventional example, FIG. 2 is an example of reflected sound in a room, FIG. 4
and FIG. The figures show the implementation of the reverberation adding method according to
the present invention), 20.21... Name of Attorney Attorney Nakao et al. 1 person 3-EndPage: 3
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