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Description 1, title of the invention
Pinaural signal synthesizer
3. Detailed Description of the Invention The present invention relates to an apparatus for
synthesizing at least two channel signals (pinaural signals) worn for playback and listening with
headphones. This Bomei picks up a pinaural sign which gives the ship the same listening heat as
the Tammy Hetto mic squeezing signal for localization of the bamboo I, and picks it up using a
normal microphone only It provides an apparatus which can be made to be able to make it by
giving. The present invention will now be described in detail based on the drawings. When a
normal sound reproduction signal is interviewed and listened to by headphones, a sense of inthe-head sound of a sound image (a sound image can be generated in an egg or in the immediate
vicinity of an egg) is generated. On the other hand, it is generally known that the EndPage: 1
sound is localized outside the head when the sound pickup signal by the dummy head
microphone is reproduced and listened to in the same manner. From this, the extra head ji effect
of the sound tends to be 1 as if it is a summoning property in the dummy head microphone
sound collecting method. Actually, the effect depends on the reflected sound component in the
signal sound reproduced by the head pong rather than the intervention of the dummy hent itself.
でいる。 For example, when the dummy head microphone is closely approached to the sound
source or there is no sound or room convergence, there is a sense of localization in the head at
the time of signal reproduction, and one that sufficiently includes the force or the sound
component. When the point microphone sound pickup signal etc. is reproduced, it may be a good
head and tail (if there is a possibility that a sense of localization may be obtained). From the
above, it is possible to synthesize a pinaural signal that gives a similar auditory effect (a feeling of
localization outside the head) by including an appropriate reflected sound component in the
signal regardless of whether the sound is collected by the dummy microphone It is a wolf. The
simple addition of the 44 音 sound is imperfect and does not provide a sufficient out-of-head
localization effect. The addition 5y of the reflection sound component needs to be made in
consideration of the configuration of the sound training No. 100 including reflection sound to be
provided to both ears at the time of sound field listening. At the time of sound field listening, in
addition to the direct sound (in various delay times, if the level, countless reflected sounds having
directions) arrive to the listener. Thus, the configuration of the reflected sound group has to be
considered from two aspects of time series and directionality. However, it is difficult to make
them micro- 7 7 7 7 Therefore, in the sound field, acoustic signals supplied to both ears are
observed in a macro-like manner, and attention is paid to the statistical character, and the
following becomes known. The sound field hearing as shown in Fig. 1 (one sound source in the
median plane) is uniquely defined, and the possible physical quantity is the sound pressure
impulse response r (t), 1 (1) from the sound source to the entrance of the binaural ear canal is
そこでr(t)、! (Check out tl functions and 1ul at 17. (1) First, r (t) and 1 (1) can be
regarded as pulse trains whose levels gradually decrease with the passage of time. (2) Next, as it
is thought that acoustic energy of approximately the same t brings to both ears f′1−, 1.10 r2tt)
dt = 10′t2 (tldt · ′ I) holds. ■ In addition, the transmission amplitude from the grenade to each
ear is divided into several numbers. 1.1L (r (t) El = lL (t (t)) l-12) L liraplus disguise ■
Furthermore, the correlation coefficient Φ between two inopulse responses defined by the C1
linear equation satisfies IΦ1 <1. The reason is that a large number of reflected sounds are
randomly drawn from all directions on the side different from the direct sound direction. Impulse
response ldX including all of the above J j Fig. 2 囚, 0 as shown in Fig. 2; You can improvise the
market by the tilay system number generation series i @ A and B of the system. Assuming that
the delay signal sequence generation frequency FA shown in FIG. 2 is a sex, and the impulse
response of RXL is R (t) and L (t), respectively, R (i) −t · δ (t) + (I-p2) (δ (t-Δτ)-2δ (tq Δτ) +
22δ (t-3 Δτ)-...) (4) L (t)-, yδ (t) + (1-y2) (. Delta. (T-.DELTA..tau. ( (T-3.DELTA..tau.-)) (5) (only 112, .delta. (TG delta) Function) (ii) :, 4
(Rrt) l = l [f + exp 1 1 ω t t) 1 / (] + fex O (-j ω t tall = 1 (and IfCut)) l = i (11 D = = f "" !! を t) (in
the case where 4 ジ i 而 T pressure L 2 (t) d 〒 0-f 2 <1 (where ττ and ττ 'do not have the
least common multiple) Next, the delay shown in FIG. Signal sequence generation circuit
EndPage: 2B0 trq, the nature is as follows. The impulse response of the L channel is identical to
that of the circuit A shown in FIG. The impulse response L (t) of the L channel is IJt) =
(T>-(1-f2) (. Delta. (1-.DELTA..tau.) + (T-2.DELTA..tau.). Times.f2 (t-3.DELTA.). ··························
(6) m / ′ ′ t t t t⁄4 L 2 (t) d t = 1 (ii) 'Cut) l) − l (−y + exp (−jω Δτ) 1 / l 1-fexp (-jω Δ '91 1
1 =, LCR (t))-172-(1-t2) 2 + (1-1 1-1 r 1 + r 1 + 1-f 2) 2 f "+ · 1 = 1 (: 12-1) / (1 + f ') K 1 so that
the delay response of the delay signal series generation circuit AXB is the nature of the impulse
response in the sound field 1 described above. It can be seen that it has all of the
The above is the reflected sound structure in the case where there is a sound source in the
median plane and the circuit configuration that simulates that structure. The cases other than the
median plane can basically be treated the same as this, but it is necessary to consider the
interaural arrival time difference and the interaural sound pressure difference of the direct sound
related to the incident direction. Based on the above, the specific configuration of the binaural
signal synthesizer will now be described. FIG. 3 is a block 1 diagram showing an example of a
pinaural signal synthesis apparatus, which is a single microphone 1.2 filter circuit 2.3 delay
circuit 4 as well as the delay signal sequence generation described earlier, mA Heavy or B)
consists of. Filter circuit 2 and! 〆3 is the inter-amplitude difference frequency characteristic B
(determined in relation to the 1d incident direction of the transmission amplitude for the
transmission amplitude from the sound source to the near one ear in each n actual sound even)
(ω) It is a filter circuit that simulates ω). Also, the delay circuit 4 has a delay time corresponding
to the inter-aural arrival time difference Δt of the direct sound determined in relation to the
incident direction. In the thus constructed pinaural signal synthesizer, the output of the single
microphone 1 placed in the sound field first passes through the filter circuit 2 and is branched
into two signals, one of which is the page method The delayed signal sequence generation circuit
A receives the signal fl and the 13 signals via the filter circuit 3 and the delay circuit 4 and is
input to the delayed signal sequence generation circuit A. The delay signal system tally
generation circuit A is connected by one or two units and is used. Among them, when the delay
signal series circuit A is connected in cascade, id is made to differ from the τ iso 4 time of the
delay path included in each circuit. An experiment was conducted in which the binaural signal
synthesis was constructed as described above, and was reproduced and listened to all through
the headphones 5. As a result, it was possible to obtain the same sense of sound image
localization as in the dummy head sound collection reproduction. Then, it was found that the
sense of direction of the sound image is substantially defined by the characteristics of the front
and rear sense filter circuit 2 by the delay time Δt of the left and right ld delay circuit 4. In
addition, the sense of distance to the sound image: tri) a) distance between 4% of sound and
microphone 1 m) delay signal sequence generation 101 path A (or B) continuation #: number of
seconds C) tilay signal sequence generation Depending on the delay time Δτ etc. of the delay
circuit in the circuit A (or B) 7, each of the above a), b) and C) is different. It was found that the
sense of distance in the sound image 1 tends to increase as the delay time Δτ increases within
25 ms as the number increases.
At the time of super microphone collection, the delay signal series generation circuit A (or B) may
be one stage. In addition, at the time of on-microphone sound collection (in the case of up to
three steps, it is possible to make the meat W have a sufficient sense of distance 1). From the
above, a signal recorded by a single microphone 1 is input to a pinaural signal synthesis
apparatus, and the delay time Δ and Δτ are controlled to control the characteristics of the filter
circuit 2. The sense of direction and distance of the sound image Can be set arbitrarily. The
fourth A shows another embodiment of the present invention, and the multi-microphone soundpickup synthesis combining some of the pinaural signals EndPage: No. 3 integration apparatus 6
described in FIG. ステムである。 It is possible to create program north with various sound
sources in any direction and distance by appropriately selecting the constant values of the
microphone and the circuit mill of the pinaural signal synthesizer (1 to n) according to the
number of sound sources. It becomes. Since the present invention is configured as described
above, (1) it is possible to create a pinaural signal source using an ordinary microphone without
using a dummy head. 2) Sound can be collected without being restricted by the conditions of the
sound field; (3) After sound collection, the nature (direction, feeling of feeling, spread) of the
sound at the time of swallowing can be arbitrarily selected . ! It is possible to control the
direction, distance, and spread of the reproduced sound image after sound collection. It is
characterized by
4. Brief description of the drawings Fig. 1 is a diagram 'and a characteristic diagram for
explaining the sound pressure impulse · · · · at the actual sound field binaural position, Fig. 21 囚,
B is used in the device according to the present invention Oh I L / (signal sequence, raw l Yo
road. FIG. 3 is a block diagram showing an embodiment of an apparatus according to the present
invention, and FIG. 4 is a block diagram showing another embodiment of the present invention. AX'B · · · Delay signal sequence generation circuit, 1: Microphone · · · · · · · · · · · · · · · · · · · · · · · · filter
circuit, 4 · delay circuit, 5 '· · · Headphone first EndPage: 4 turns, 5 α 1- I Go t ′ ′ j +. Fig. 4-EndPage: 5