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JPS5863290

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DESCRIPTION JPS5863290
[0001]
The present invention relates to a headphone sound image control apparatus in the case of
listening to a monaural signal or a stereo signal by binaural headphones, and an object of the
present invention is to provide a headphone sound image control apparatus capable of natural
headphone hearing. Generally, when listening to a stereo signal with binaural headphones, the
sound image tends to be localized in the head. For this reason, it has been attempted to add a
sound image control device having a binaural difference circuit having five binaural transfer
characteristics and a reverberation generation circuit to psychologically give a sense of direction,
a sense of expansion, and a space window to an auditory sense image and timbre. . However, in
the conventional headphone sound image control device, a reverberation generation circuit is
simply added to the binaural difference circuit, and the reverberation merely provides a
psychological sense of expansion and a space window. , There was a problem that the clarity is
reduced. The present invention solves such conventional drawbacks, and includes a binaural
difference circuit and both side walls 1 in the rectangular chamber. By adding a sound image
control device provided with a sound generation control circuit that has a reflected sound
generation circuit related only to primary reflections from six surfaces of the ceiling surface and
the floor surface, natural headphone hearing without deterioration of timbre and loss of clarity
can be achieved. It was constructed in The headphone sound image control apparatus according
to the present invention will be described below with reference to the drawings. FIG. 1 shows an
embodiment of the headphone sound image control apparatus according to the present
invention. In FIG. 1, 1.2 is an input terminal for left and right stereo signals, and 3.4 is an image
signal controlled left and right stereo signals An output terminal, 6.6 is a binaural difference
circuit for adding a spatial crosstalk component generated during speaker reproduction of the
left and right stereo signals, and is based on the head sound pressure transfer characteristic from
the 3 o 0 direction sound source as a reference A level setter 51 for giving a sound pressure
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transfer characteristic to the ear of the speaker and a delayer 5b for giving a binaural time
difference from the sound source in the 30 'direction. Reference numeral 7 is a primary reflected
sound generation circuit from the floor, and a level setter 7a and a delay unit for giving a head
sound pressure transfer characteristic in the ?-o0 direction based on the head sound pressure
transfer characteristic from the 3o0 direction sound source It consists of 7b. Reference numeral
8 is a primary reflected sound generator from the front wall, which is a level setter 84 and ujMK
6 s that give a head sound pressure transfer characteristic in the ?-00 direction based on the
head sound pressure transfer characteristic from the 3o0 direction sound source b @@@ t -g hc
??; 6 o 9 o 1 primary reflected sound generation circuit from the side wall, head in ?-+300
(right) direction with reference to head sound pressure transfer characteristics from a 30 ░
direction sound source It comprises a level setter 9a for giving a partial sound pressure transfer
characteristic and a delay 9b.
10 is a primary reflected sound generation circuit from the left side wall, which is a level giving a
head sound pressure transfer characteristic in the 0 = -30 ░ (left) direction with reference to the
head sound pressure transfer characteristic from the 30 'direction sound source It comprises a
setter 10a and a delay 1ob. Reference numeral 11 denotes a primary reflected sound generation
circuit from the ceiling surface, which is a level setter 11a for providing a head sound pressure
transfer characteristic for ?-oC '15 with reference to the head sound pressure transfer
characteristic from the 3o0 direction sound source It is comprised by the delay device 11b. 12 is
a primary reflected sound generation circuit from the rear wall, and a level setter 122L for giving
a head sound pressure transfer characteristic in the ? = 00 direction based on the head sound
pressure transfer characteristic from the b3oo ? ? j5 sound source and a delay It is comprised
by the vessel 12b. A reference numeral 13 denotes a right channel signal applied to the input
terminal 1, a left channel signal passing through the binaural difference circuit 6, and floor
surfaces from the first reflected sound generation circuits 7, 8, 9, 11.12. (1) An adder for adding
the first reflected sound signals of the fifth wall, the right side wall, the ceiling surface, and the
rear wall, and is provided in the signal transmission path of the right channel. 14 is a left channel
signal applied to the input terminal 2, a right channel signal passed through the binaural
difference circuit 5, and floor surfaces from the first reflected sound generation circuits 7, 8, 10,
11.12, It is an adder for adding the primary reflected sound signals of the front wall, the left wall,
the ceiling surface, and the rear wall, and is provided in the signal transmission path of the left
channel. Here, the first reflected sound generation circuits 7, 8, 9 10.11.12 ignore the
information on the median plane angle ?, and set the level setting devices 7a, 8a, 92L, 1Q &.
11a, 12 & level value GO1, Ga4 * Ga4. GO4 + Go ,, l Set GO 6 and also each delay 7b. Time delay
?1 of sb, 9b, 1ob, 11b, 12b. ?2. ?5. ?4. ?5. I have set ?6. Specifically, set ?1 = 2.2 to 2.66
m5 ecl ? 2 = 11.0 to 13.6 m 5 ec, ? 3-19 to 23 m 5 ec, ? 4 = 24 to 30 m 5 ec, ? 5-31 to 36 m
5 ecl ? 6 = 36 to 40 rl I Sec There is. In this case, as a matter of course, it is a condition that the
sound pressure transfer characteristic of the eardrum when wearing the use headphone is equal
to that from the 300 direction speaker to the eardrum when listening to the speaker. The
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headphone sound image control apparatus configured as described above enables headphone
listening similar to the case of reproducing and listening to a stereo signal with two speakers
arranged at appropriate intervals in a room having a rectangular inner volume.
That is, at the time of speaker reproduction of a stereo signal, as shown in FIG. 1, the speaker
spR. Difference in the sound path to the both ears of the listener y caused by the arrangement of
SP, H? * HOR, and as shown in FIGS. 2A and 2H, 40 reflected sounds from the room wall, floor,
and ceiling. The presence of the sound forms a basis of an amount given by a number of
psychological expressions such as sense of direction, sense of spread, feeling of space, etc. in the
auditory sense image. The binaural transmission-number difference He1 l / H? in FIG. 1 is
necessary for recognizing the sound source in the ? direction, for which a binaural difference
circuit 5.6 is provided. FIG. 2 is an example of the arrival reflection sound based on the room
constant to be listened, and in fact, it is repeatedly reflected and diffused repeatedly and exhibits
extremely complicated appearance. By the way, although there is a lot of controversy about the
utility of the reflected sound, as shown in FIG. 2, the contribution of the initial reflection arriving
at the listener with one reflection only once occupies most of the effect on the audibility. It may
be called. In particular, it is said that the content of the information signal is not music but is a
while for voice. That is, the amount of reverberation is natural and natural, and the effect is
realized such that the distance to the speaker's sound image is felt large. Also, FIG. 4 is based on
a cepstrum obtained in a room with a rectangular internal volume which is said to have natural
voice dialog and little reverberation during actual conversation but sufficient sense of distance to
be obtained. Among them, six initial reflections are pre-reflection structural models that define
the incident direction, and the size of the sense of distance by the multi-speaker of this initial
reflection only model and the naturalness of the reverberation are the actual rooms described
above. Psychological experiment results equivalent to those in ? are obtained. Therefore, a
headphone listening system simulating the primary reflection sound of each surface in a
rectangular space is effective for performing headphone listening equivalent to that intended to
reproduce and listen a stereo signal in the rectangular space. I can hear it. In the above
embodiment, the case where the information signal is a stereo signal has been described.
However, even if it is a monaural signal, it may be divided into two and inputted, and the same
effect can be obtained. As described above, according to the present invention, the binaural
difference circuit for applying a cross component between the signal transmission paths of the
left and right speakers of the headphone main body, and a rectangle for the composite signal
between the two signal transmission paths The reflection sound generation means is provided
with reflection sound generation means for generating only the primary reflection sound from
the six surfaces of the indoor space, and the reflection sound generation means is the primary
reflection from four surfaces of the front and rear walls, the ceiling surface and the floor surface
in the rectangular indoor space. A signal component corresponding to sound is commonly added
to both of the signal transmission paths, and signal components corresponding to primary
reflections from the two surfaces of the other two side walls are independently added to each of
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the signal transmission paths. Since it is configured to be added, there is no excessive
reverberation, natural headphone listening can be performed without causing a drop in timbre
and a drop in clarity, and it is similar to stereo (1) live listening in a rectangular indoor space. I
can listen to headphones.
(-In particular, the headphone receiver 1pj 4 of the information with the content of the sound. J is
also freed from the conventional sense of in-head localization, and the sound image is localized
keeping a large distance outside the head, and the timbre is degraded due to a lot of
reverberation. Sound image control can be performed quite naturally without any loss of clarity.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a block diagram showing an embodiment of a headphone sound image control
apparatus according to the present invention, FIG. 2 is an explanatory view of sound pressure
transmission at the time of speaker reproduction of a stereo signal, and FIG.
B is a transmission explanatory diagram of the primary reflection sound in the rectangular room,
and FIG. 4 is a characteristic diagram for explaining and brightening the time delay of the initial
(-order) reflection sound in the room. 5.6 ииииии A binaural difference circuit, 7, 8, 9, 10 ░ 11.12
иииииииии Wide reflection sound generation circuit, 13.14 иии Adder. Name of agent Attorney Nakao
Toshio Other 1 person Figure 2 Figure 4
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