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Industrial application field What is the present invention? The present invention relates to an
audio signal reproduction method that improves the sense of reality when reproducing an audio
signal into audio. Prior art] In J3 at the audience seat of Nsert Hall, the listener listens to the
direct sound from the sound source and the indirect sound by reflection, and it is assumed that
the presence time is obtained by the time difference ΔT between the direct sound and the
indirect sound. ing. Conventionally, a normal two-channel stereo system is realized by
reproducing a two-channel stereo audio signal as it is with two speakers as it is and delaying the
two-channel audio signal for a predetermined time by, for example, a digital delay circuit. There
is a reproduction system that tries to surpass the sense of reality (; 1). Problems to be Solved by
the Invention In the conventional reproduction system, the delayed voice signal output from the
R wind circuit is delayed for a predetermined time regardless of the frequency with respect to the
original voice signal before being input to the delay circuit. However, the difference between A
and B between J5 + 114 in the hall to the concert 1 changes according to the distance from the
blind source to the listener, and Ilr +! The lower the frequency is, the more the time difference Δ
は becomes human, and when the frequency becomes higher, the time difference 6 has a Bi
property that gradually approaches a value J at a low frequency and a small constant value. For
this reason, the original voice signal and 11 Iil! The sound reproduced by the conventional
reproduction system in which the time difference from the spread voice signal is not related to
the frequency is that the component of several thousand 1-1 z frequency or more has no sense to
the listener, and the sense of reality is not There was a problem that it was impossible to get the
real feeling of being present in the actual Conlit Hall, as there were 4 natural things. Therefore, it
is an object of the present invention to provide an audio signal reproduction system in which the
above problems are solved by the first and second speakers and the phase shifter. SUMMARY OF
THE INVENTION In the present invention, a first speaker reproduces an input speech signal, and
a phase shifter phase-shifts the input speech signal by IJI bamboo of transfer function G (S 1)
represented by The 8-voice B5 output from the phase shifter is subjected to 11 * by the second
speaker. In the present invention, the input sound fii signal is reproduced from the first speaker
as it is according to the present invention, and the phase shift is performed by the phase shifter
from the second speaker. 11 signal is re-applied. The transfer function of each phase shifter is
expressed by and approximates the frequency characteristic of the time difference between the
junction & J j and the indirect prior to the junction 1 to the hole. Embodiment 1 FIG. 1 is a block
diagram of an embodiment of an audio signal reproduction system according to the present
invention. In the figure, terminal 1a.
1b each a record player, tape recorder. The right and left signals of the stereo A from the tuner
and the like come in. The right signal input to the terminal 1a is supplied to the preamplifier 2a,
where it is subjected to processing such as equalization and tone control and is output. The
output right signal of the preamplifier 2a is branched into two, one of which is amplified by the
power amplifier 3a and then supplied to the first speaker 4a to be reproduced as the right main
audio. The other output right side (No. g is supplied to the phase shifter 5a. The phase shifter 58
has, for example, a constant gain over the entire frequency range, but the lower the frequency,
the smaller the amount of phase delay, and the higher the frequency, the closer the phase delay
to a larger value. It is a mu with characteristics. The right signal phase-shifted by the phase shift
+58 is amplified by the power amplifier 6a and then supplied to the second speaker 7a to be
emitted as the right sub-audio. The preamplifier 2b for processing the left signal, the power
amplifiers 3b and 6b, the speakers 4b and 7b, and the phase shifter 5b have exactly the same
configuration as the processing circuit for the right signal, and the left main audio is reproduced
from the first speaker 4b. The left sub audio is reproduced from the second speaker 7b. By the
way, Laplace transform of the original signal h (B and the signal h divided by Δt for 11 over the
entire frequency domain 11 by Δt) is given by the following equation. No (h (t))-1-1 (s) ... (1) 7:
(h (-DELTA t) = 1-1 (s)-e-3 ° At ... where S is Laplace That is, the transfer function of the delay
circuit having a constant deviation over the entire frequency range a3C in the conventional
reproduction system is e-Sol, and its 1g9 phase is expressed by the following equation. −3 · Δ
[tel = 1) (3a) l e −S ° Δ 1 = −27 rf −Δ U − (3 b) where f is the frequency of the μ bypass
represented by the equation (3 b) The frequency characteristic is as shown by the broken line 1
in FIG. Next, the difference TT between the concert 11 and the a3 I-J is larger as the voice
frequency is lower, and asymptotically to a smaller constant value according to the high
frequency, as expressed by the following equation . − [ΔT −ΔTo −e 10 ΔTM I N − (4) where
ΔTM IN is the delay lora question when the frequency is infinite, and ΔTo is the delay with
respect to ΔTM I N when the frequency is zero, “1 The increment (4) of is the characteristic as
shown in FIG.
When the transfer function at 43 in the Reitto Hall is found (substituting this Δt in equation (4)
into Δt in equation 2), the phase of this transfer function is represented by the following J ° C.
The phase-frequency characteristic represented by the equation (0) is as shown by an alternate
long and short dash line in FIG. In FIG. 2, the phase and frequency characteristics of the
conventional reproduction system and the phase and frequency characteristics of the concert hall
are completely blamed, and due to this difference, the sense of presence by the conventional
reproduction system is unnatural It had become. The phase shifter 5a in the system of the
present invention shown in FIG. Each of 5b has a phase / frequency characteristic as shown, for
example, by a solid line 2 in FIG. Each of the above phase shifters 5a and 5b is configured by, for
example, continuously connecting the J phase circuit shown in FIG. 4 (.DELTA.) In multiple stages
(for example, tens of stages). As shown in FIG. 4 (A), the incoming terminal 10 of the signal is
connected to the inverting input terminal of the operational amplifier 11 via the resistor R1 and
also via the resistor Rp. It is connected to the non-inverted input terminal of the width device 11.
The output terminal of the operational amplifier 11 is connected to the signal output terminal 12
and to the inverting input terminal via the resistor R2. The noninverting input terminal of the
operational amplifier 11 is grounded via a capacitor Cp. The resistors ff1 of the resistors R + and
R2 are equal to each other, and the gains of all frequency bands are 1. The transfer function G +
(s) of the above circuit is expressed by the following equation 4.1. G+(S)=ニド」」! 6) 1 +
τ 1 · S where τ 1 is a time constant, and τ + = R ・ · C 位相 The phase-frequency
characteristics of this circuit are as shown in FIG. The phase of one or more high frequencies is
delayed by 180 degrees with respect to the low frequency of Here, as shown in FIG. 4 (A), the
transfer function G (S) Tj order j (j) when n (n is an integer of 2 or more) phase shift circuits are
continuously connected is represented. G (S) = G + (S) · G2 (S) · · · · · · Gn (s) The phase 1 G (s) of
this transfer function G (s) is ZG (s)-乙 G + (S) + LG2 (S) 4 =. + TGn (s)... E, and the value
approaches-( As the frequency increases. Time constant τ1 of the above n phase
shift circuits. τ2. When each τ1 is equal to τ, the transfer function G (S) is G (S) = (′ ′ Nieni
辷) 1 (9) 1 + τ · S, and in this case, the solid line in FIG. The phase and frequency characteristics
are as follows.
Since the phase shift Z5a, 5b has a phase / frequency characteristic t'l approximating to the El
phase / frequency characteristic 4 of the capacitor 1 no 1 hole, the speaker 4a. The sound
reproduced by each of the speakers 7a and the speakers 4b and 7b has a sense of presence very
similar to the sound 4-11, and a component of high ll11i (for example, a frequency of 1000 H2
or more) of the reproduced sound is as usual. It does not give the listener a feeling of echo. Also
one input? ) For the voice signal, the signal processing by the phase shifter is fine in line 4, and
there is no need for a filter circuit etc! l configuration. Note that several combinations of the
resistor Rp and the capacitor Cp in FIG. 4 are prepared, and the time constant τ1 ° τ2. ... A
phase shift circuit in which several kinds of τ1 are different is connected in cascade, and a °
transfer function G + (S) shown in ω equation. G2 (S),... Gη (S) may be configured to obtain the
same phase / frequency characteristics as the characteristics shown by the dashed-dotted line 1
in FIG. 2 by changing the respective values as necessary. Further, the phase shift circuit is not
limited to that shown in FIG. 4, and may be a proper circuit. Further, the present invention can be
applied to other systems such as monaural and 4 channels other than the two-channel stereo-h
system, and the present invention is not limited to the above embodiment. Effect of the Invention
As described above, the method of the present invention is the first speaker. Since it is composed
of a phase shifter and a second speaker, it can be realized as being near a concert hall without
giving a feeling of high frequency echo as in the prior art, and has a feature such as being in a
cylinder configuration. There is.
Brief description of the drawings
FIG. 1 is a block diagram of an embodiment of the present invention system, FIG. 2 is a diagram
for explaining phase and frequency characteristics, and FIG. 3 is a diagram showing an example
of the relationship between time difference and frequency in continuous hole. FIG. 4 is a circuit
diagram of one embodiment of the phase shift circuit constituting the partial circuit shown in
FIG. 1 and a phase-frequency characteristic diagram thereof.
2a、2b−・・プリアンプ、3a、3b、5a。 6 b-· · Power amplifier, 4a, 4b, 7a, 7b-· · ·
Speaker 5a, 5b · · · Phase shifter. Figure 1 Figure 2
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jps61281799, description
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