JPS59186500A - Stereophonic reproducing device - Google Patents

Abstract

PURPOSE:To correct a localization distribution by adding reverberation with spread easily without adding another speaker. CONSTITUTION:A left and a right channel signal are added inversely by an adder 15, whose sum output (-M) is supplied to the 1st and the 2nd reverberation tone generation parts 16 and 17. The 1st reverberation generation part 16 invertes the signal (-M) by an adder 16a and further inverts it by an inverting amplifier 16b, and the resulting signal is attenuated by an attenuator 16e into a signal (-alphaM), which is outputted as a direct tone component inverted by an adder 16f. The 2nd reverberation generation part 17 inverts the signal (-M) into a signal (M) by an adder 17a and the signal (M) is attenuated by a specific amount through an attenuator 17d into a signal alphaM, which is inverted by an adder 17e to output a signal -alphaM as a direct tone component. The adder 17e outputs a signal (alpha(1-alpha<2>)M) as the tertiary indirect tone component. Similarly, the quadratic and succeeding indirect tone components are outputted. An adder 20 outputs an inverted left channel signal -alphaR, a signal M2(alpha(1-alpha<2>)M) and a signal M3(alphabeta(1-alpha<2>)M) as indirect tones, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a stereo reproduction device, and more particularly to a stereo reproduction device capable of adding a spacious reverberation.

In a car stereo system, the left side is provided on both sides of the front or rear side because the position of the listener changes greatly, for example, in the driver's seat, passenger seat, etc.

Listening will always be asymmetrical with respect to the right channel speaker. - For this reason, car stereo devices are provided with a correction device that performs sound image localization correction.

FIG. 1 is a circuit diagram showing an example of a conventional localization correction device generally used. Left and right channel signals (L, R) are added together in an adder 1. Further, the left and right channel signals (L, R) are supplied to left and right channel speakers 4.5, respectively, via delay circuits 2 and 3, respectively. On the other hand, in adder 1, left and right channel signals (
The signal obtained by adding L and R) is configured to be attenuated by an attenuator 6 and then supplied to a center speaker 7.

Localization correction configured like this! In a stereo device having a
and the center speaker 7, the amount of attenuation in the attenuator 6 is reduced and the center speaker 7
In this way, the listener can hear the output sound pressure of the right channel speaker 4 and the center speaker 7.
Localization degree correction will be performed.

However, in the apparatus having the above configuration, although localization can be corrected, it is not possible to add expansive reverberation.

To solve this problem, for example, as shown in FIG.
The configuration is such that reverberation is added by supplying the reverberation to the reverberation speakers 11 and 12 provided on both sides of the listener 8, respectively.

However, the above configuration has a major drawback in that two additional reverberation speakers are required to add reverberation.

An object of the present invention is to provide a stereo reproduction device that can easily add reverberation that gives a sense of spaciousness without adding speakers.

Hereinafter, the stereo reproduction device according to the present invention will be explained in detail using the drawings.

FIG. 3 is a main circuit diagram showing an embodiment of a stereo reproduction device according to the present invention, and the same parts as in FIG. 1 are given the same reference numerals. In the same figure, 13.14 is the delay circuit 2.3
15 is an adder for inverting and adding the left and right channel signals 1-9R, 16.1
7 receives the output of the adder 15 as an input. Second
The first reverberation sound generation section 16 is a reverberation sound generation section, and the first reverberation sound generation section 16 is (L
+R) A reverberant sound signal consisting of an inverted direct sound component and non-inverted secondary and subsequent indirect sound components is generated, and the second reverberant sound generating section 17 generates a reverberant sound signal consisting of an inverted direct sound component of the (L+R) signal. and the tertiary 1 inversion which does not invert the 2nd order 1 inversion -
A reverberant sound signal consisting of an indirect sound component that alternately repeats normal rotation and nine inversions is generated.

In this case, the first reverberation sound generating section 16 includes an adder 16a which receives the output signal of the adder 15 as one inverted addition input;
An inverting amplifier 16b that inverts the output of the adder 16a, and a delay circuit 16c that delays the output of the inverting amplifier 16b.
an attenuator 16d that attenuates the output of the adder 16a to remove the other inverting input of the adder 16a, and an adder 16f that calculates the difference between the output signal of the inverting amplifier 16b supplied via the attenuator 16e and the output of the delay circuit 16C. It is made up of.

On the other hand, the second reverberation sound generating section 17 includes an adder 17a which receives the output signal of the adder 15 as one inverted input, and
an attenuator 17c that attenuates the output of the delay circuit 17b and supplies it to the other inverting input terminal of the adder 17a; and an adder 17a that is supplied via the attenuator 17d. output signal and delay circuit 17b
and an adder circuit 17e that inverts and adds the output signals of . 18 is an adder that inverts and adds the output of the attenuator 13, the output signal of the first reverberant sound generating section 1G, and the output signal of the attenuator 14; 19 is an attenuator that attenuates the output horn of the adder 18; 20 21 is an adder that adds the output of the delay circuit 2 and the output of the attenuator 19 and supplies it to the right channel speaker 4; 21 is an attenuator that attenuates the output of the second reverberation sound generating section 17 and supplies it to the center speaker 7; , 22 is the delay circuit 3
This is an adder that inverts and adds the output of the attenuator 19 and the output of the attenuator 19, and supplies the result to the left channel speaker 5.

In a circuit configured like this, first the left side.

The right channel signals are inverted and added in an adder 15,
This addition...force (-M) is the first. a second reverberant sound generating section 1θ,
17 respectively. Then, in the first reverberation sound generating section 1G, the signal (-M) is inverted by the adder 16a, inverted again by the inverting amplifier 16b, and the signal (-M) is inverted by the attenuator 16.
It is attenuated by e and becomes a signal (-αM), which is sent to adder 16f.
It is output as a more inverted direct sound component. Next, when the delay time T1 of the delay circuit 16c elapses, the inverting amplifier 1
The signal (-M> supplied from the delay circuit 16c appears at the output of the delay circuit 16c and is input to the inverting terminal of the adder 16[, and at the same time, the signal (-M) is attenuated by the attenuator 16d and becomes the signal (-M) at the output of the delay circuit 16c.
(-αM), adder 16a1 inverting amplifier 1611
．． Addition 11 as signal (-α2M>) via attenuator 16e
It is input to the non-inverting terminal of 6f. Therefore, the adder 16f outputs the signal [(1-α2→M]) as the second-order indirect sound component.Similarly, third-order and subsequent indirect sound components that are not inverted are output at every time T1. Further, in the second reverberation sound generating section 17, the signal (-M) is inverted by the adder 17a to become the signal (M), attenuated by a predetermined amount by the attenuator +76 to become the signal (αM), and the signal (-M) is inverted by the adder 17e to become the signal (αM). The signal (=αM) is inverted and output as a direct sound component.Next, the output of the adder 17a (M) is the delay circuit 1.
7b, the predetermined time T1 is delayed by 1, and the adder 17e
At the same time, the signal >+(-M) is attenuated by the attenuator 17c to become a signal (αM), which is inverted by the adder 17a, and further attenuated by the attenuator 17d to become the signal @(-M). α2M) and is input to the other inverting terminal of the adder 17e. Therefore, the adder 17e is
The signal @[-(1-α2)M] is output as the second-order indirect sound component. Further, the output (-αM) of the adder 17a is delayed by the delay circuit 17b and inputted to the inverting terminal of the adder 17e, and the signal (-αM) is attenuated by the attenuator 17c and inverted by the adder 17a. signal (α
2M), which is attenuated by the attenuator 17d to become a signal (α3M) and input to the inverting terminal of the adder 17e. Therefore, the adder 17e outputs the signal [α(1-α2)M] as the third indirect synthesis component. Thereafter, the fourth and subsequent indirect sound components are output in the same manner. Then, the output signal of the first reverberant sound generating section 16 is inverted and added to the left and right channel signals @(L, R) which are sent to the adder 18 and attenuated by the attenuator 13.14. Therefore adder 18
The signal (αM) and the signal (−αM
) is input, the direct sound component is not chitoncelled and output, but only the second and subsequent indirect sound components supplied from the adder 16 are inverted and output. This indirect sound component is attenuated by a predetermined amount m (β) by the attenuator 19 and input to one inverting terminal of the adder 20.22. The right channel signal (αβ) that has been attenuated by the attenuator 13 and delayed for a predetermined time by the delay circuit 2 is input to the other inverting input terminal of the adder 2o, so the adder 2o receives the inverted right channel signal @ (-αβ) and the signal M as an indirect sound
z[β(1-α2)M], signal M3[αβ(1-α2>
M], etc., and these are supplied to the right channel speaker 4 to generate musical tones including reverberation. The output signal of the attenuator 19 is also supplied to the right channel speaker 5 via the adder 22, thereby generating musical tones containing reverberant sound similarly to the right channel speaker 4.

On the other hand, the output signal of the second reverberation sound generation section 17 is transmitted to the attenuator 21.
J3 is attenuated and supplied to the center speaker 7 as a double amount Tl11 (-α0M> signal TTlz[-(1-α2)βM] signal Tns[αβ(1-α2)M], etc.).

Therefore, the center speaker 7 emits the signal 'm1 (-α0M) obtained by inverting the added signal of the left and right channel signals as a direct sound component, and then is delayed for a time T2 determined by the delay circuits 2 and 3. Right channel speaker 4J
, the inverted right channel signal K-αR) is also inverted from the left channel beaker 5J: the inverted left channel signal (
-αβ) are output as direct sound components. Next, at each time delayed by a time T1 after the signal Tni is emitted from the center speaker j7, the left and right channel speakers 45 output the signal M2 as an indirect sound component that is not inverted.
[(1-α2)βM], signal M3 [(1-α2)αβM
] etc. are output in sequence, and the center speaker 7 outputs a signal 'm12 [(1-cx2)βMl.

Signals 'n''13 [(1-α2)αβM], etc. are sequentially output.As a result, the signal 'n''13 [(1-α2)αβM], etc. is output sequentially. The listener will hear reverberant sound with a low correlation, and as a result, a stereo sound with a large sense of spaciousness will be obtained.

Note that the attenuators 13.14.16d, I6e, 1γ
c and 17d each have the same amount of attenuation, and the attenuation amounts can be manually adjusted in conjunction with each other, thereby making it possible to adjust the time during which the reverberant sound remains. Further, the delay circuit 2.3 may have a length of 2 to 10n, for example.
They have the same delay time of +s, and the delay circuit 16c
, 17b have the same delay time of, for example, several tens of ms, and each delay time can be manually adjusted.

Further, the attenuators 19 and 21 have the same amount of attenuation, and the attenuation amount can be manually adjusted in conjunction with each other, thereby making it possible to correct the localization distribution.

Further, the output of the attenuator 19 may be supplied to the input of the delay circuit 2.3.

As described above, the stereo reproduction device according to the present invention has excellent effects in that localization distribution can be corrected and reverberation sound with a sense of spaciousness can be easily obtained without adding speakers.

[Brief explanation of drawings]

1 and 2 are circuit diagrams showing the main parts of a conventional stereo system, and FIG. 3 is a circuit diagram showing the main parts of an embodiment of the stereo playback device according to the present invention. 2.3...・Delay circuit, 4, 5... Left and right channel speakers, 7... Center speaker, 13.14.1
9゜21...attenuator, 15.18.20.22...
Adder.

Claims (1)

[Claims] (1) A first adder that adds left and right channel signals, and a first reverberant that receives the output of this first adder and the left and right channel signals as input and generates a reverberation signal in which direct sound components are canceled. 8 left; a sound generating means; and a second reverberant sound generating means that receives the output of the first adder as an input and generates a reverberant sound signal containing a direct sound component. A second... A stereo reproduction device comprising a reverberation sound generation circuit including a third adder and an attenuator that attenuates the output of the second reverberation sound generation means and supplies the output to a center speaker.