JPS6322680B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an indirect sound generation device applied to electroacoustic equipment and electronic musical instruments, and its purpose is to create a sense of space and spaciousness with a simple configuration. The present invention provides an excellent indirect sound generating device that can produce high-quality indirect sound.

Fig. 1 shows a conventional example of a reverberation adding device using a delay device 1 having a single delay time, and Fig. 2 shows a delay device 4 having six different delay times (for example, BBDMN3011 with tap manufactured by Matsushita Electronics Co., Ltd.). 3 shows an output signal generated at the output terminal when an impulse is input to the input terminal in the conventional example of FIG.
The figure shows the output signal in the conventional example shown in FIG. The reverberation generating device shown in FIG. 2 using delay devices having different delay times has a more complex reverberation characteristic pattern compared to the reverberation generating device shown in FIG. 1 using delay devices having a single delay time. can be generated, providing more natural reverberation characteristics.

For the above reasons, delay devices having different delay times have only been used in reverberation generators with one channel input and one channel output, such as the conventional example shown in FIG.

FIG. 5 shows a conventional example of a reverberation adding system used in the production process of two-channel stereo records. In Fig. 5, an electrical signal such as a musical instrument sound input to the input terminal is branched into two channels, and one signal _S1 is directed to the sound image direction caused by the voltage level difference between the outputs ₀₁ and ₀₂ . The signal is applied to adders 7 and 8 via a two-channel panpot 6 consisting of two volumes for controlling the signal. The other signal _S2 is a voltage level adjustment volume 5,
Time delay device 1 with a single delay time (usually 50 ~
200ms delay time), reverberation generator 2
(for example, the example shown in FIG. 2 or a device using a spring), the signals are branched into two channels of the same phase and level, and applied to the adders 7 and 8 to generate two channel outputs 0 ₁ and 0 ₂ . Note that a normal reverberation addition system is mainly divided into a direct sound control system and an indirect sound generator R. The direct sound control system corresponds to the sound control device permanently installed in the studio, and the indirect sound generator R is an external connection device. In this case, the localization of the indirect sound is determined by the output 0 ₁ ′ of the indirect sound generator R,
Since 0 ₂ ' is at the homologous level, it becomes the center between the two channels, that is, the center of the two front right and left spookers, and does not have any spatial extension.
A conventional example in which such drawbacks have been eliminated is shown in FIG.
The difference between the indirect sound generator R in FIG _. 6 and the example shown in FIG. The cross-correlation coefficient between the two channel outputs 0 ₁ ′ and 0 ₂ ′ of the indirect sound control system R is set to 1 or less by providing a time delay device 3 with a second signal S ₄ and a volume 17 for the other signal S 4 . ,
The point is that it has a sense of spaciousness and expansion. The volume 17 has the function of moving the movement in the sound image localization direction caused by the time delay device 3 in the opposite direction by utilizing a trading phenomenon of localization movement due to time difference and localization movement due to level difference.

FIG. 7 shows the level-time characteristics of the outputs 0 ₁ and 0 ₂ in the example shown in FIG. 5, and both outputs 0 ₁ and 0 ₂ have the same delay time τ level.
It shows that.

On the other hand, FIG. 8 shows the output 0 ₁ ,
The output 0 ₁ is a reverberation signal r ₁ with a delay time τ level l, while the output 0 ₂ is a reverberation signal r ₁ with a delay time (τ + Δτ) and a level (l + Δl). It shows that the signal _r2 .

The present invention relates to an indirect sound generating device that has a small number of components while maintaining the same spatial spreading effect of indirect sound as in the past.The present invention will be described below.

FIG. 9 shows an embodiment of the present invention, which has exactly the same function as the conventional example shown in FIG. The electrical signal input to the input terminal' of the indirect sound generator R is transmitted to the volume 5, the reverberation generator 1,
The signal is outputted to output terminals 0 ₁ ' and 0 ₂ ' via a time delay device 4 and volumes 17 and 18 having two different delay times for one input. For example, if the delay time of the output signal of output terminal 0 ₁ ' is 100 milliseconds,
By setting the delay time of the output signal of output terminal 0 ₂ ' to 120 milliseconds, the level time characteristics shown in Fig. 8 become τ = 100 (ms) ∆τ = 120 - 100 = 20 (ms), and the 6th In the conventional example shown in the figure, time delay device 1
This corresponds to the case where the delay time of time delay device 3 is set to 100 milliseconds and the delay time of time delay device 3 is set to 20 milliseconds. Furthermore, when using BBDMN3011 with a tap manufactured by Matsushita Electronics Industries as the time delay device 4, the clock frequency is set to 13.9KHz, and out of the six outputs of the BBD, output 5 (number of BBD stages 2790), output 6 (number of BBD stages
3328), their delay times are 100 milliseconds and 119 milliseconds.

FIG. 10 shows another embodiment of the invention. In this case, the degree of spatial expansion of indirect sound can be extended to the outside of the two reproduction speakers, whereas in the case of the embodiment shown in FIG. 9, it is between the maximum of two reproduction speakers. This is a case where the purpose is

That is, for each of the outputs S ₃ and S ₄ of the time delay device 4 having two different delay times for one input, the left 90° direction virtual sound source generation circuit 13 and the right 90° direction virtual sound source generation circuit The output of each circuit is applied to adders 9 and 10 via 16 to obtain two channel outputs 0 ₁ ',
0 ₂ '.

These 90° direction virtual sound source generating circuits 13 and 16 are as follows:
Binaural common circuits 11 and 14 and binaural difference creation circuit 1
It consists of 2.15.

The concept of the 90° direction imaginary sound source generation circuit will be described below.

FIG. 11 shows an example of a speaker device that can make the user feel as if he/she is listening to the sound radiated from the speaker placed at point Q while listening to the sound radiated from the speakers 21, 21'. 1st
In Figure 1, H ₁₁ and H ₁₂ are the speakers 21 and 2.
1' and the left and right ears of the listener 22, and H〓 ₁ and H〓 ₂ are the transfer functions between this speaker and the left and right ears of the listener when the speaker is placed at point Q. It is a transfer function, which is the sound pressure radiated from the speakers 21 and 21' and applied to the listener's left and right ears, and the sound pressure radiated from the speaker placed at point Q and applied to the listener's left ear.
If the sound pressure applied to the right ear is equal, even though the listener is listening to the sound radiated from the speakers 21 and 21', the speaker is placed at point Q, and the listener is listening to the sound from this speaker. It feels like there is.

Blocks 20 and 19 in FIG. 11 are a binaural common circuit and a binaural difference creating circuit for giving an effect as if a speaker is placed at point Q, and the characteristics of the binaural common circuits 11 and 14 are H 〓 ₁ /H ₁₁ , the characteristics of binaural circuits 12 and 15 are H ₁₁ H〓 ₂ −H ₁₂ H〓 ₁ /H ₁₁ H〓
₁ −H ₁₂ H〓 ₁ .

FIG. 12 shows still another embodiment of the present invention.
In this case, different delay time signals l ₁ to l ₆ are made into two-channel signals by adders 9' and 10', and compared with the embodiment shown in FIG. 9, a case is shown in which greater spatiality is reproduced. ing.

FIG. 13 shows still another embodiment of the present invention.

In this case, the different delay time signals l ₁ to l ₆ are converted into two-channel signals by adders 9' and 10',
In comparison with the embodiment shown in FIG. 10, this shows a case where a larger spatiality is reproduced.

As described above, according to the present invention, a time delay device that generates signals having at least two or more different delay times is used, and its output is synthesized with direct sound through a voltage level control means to create a two-channel stereo system. Since it is configured to generate a signal, it has the advantage of providing an indirect sound generating device that can create a sense of space and spaciousness with a simpler configuration than conventional ones.

[Brief explanation of the drawing]

Figures 1 and 2 are block diagrams of conventional reverberation adding equipment, Figures 3 and 4 are diagrams showing the output waveforms of the same equipment, and Figures 5 and 6 are diagrams showing conventional two-channel stereo signal generation. The block diagrams of the reverberation addition system, Fig. 7 a, b, and Fig. 8 a, b are
9 is a block diagram of a reverberation adding system using an indirect sound generator according to an embodiment of the present invention, and 10 is a diagram showing each output waveform of the system shown in FIG.
The figure is a block diagram of a reverberation adding system using an indirect sound generating device according to another embodiment of the present invention, FIG. 11 is an explanatory diagram of an imaginary sound source generation circuit used in the device,
1 and 13 are block diagrams of a reverberation adding system using an indirect sound generator according to still another embodiment of the present invention. 1... Reverberation generator, 4... Time delay device, 6...
...2 channel donpot, 5, 17, 18...
Volume, 7, 8, 9, 10, 9', 10'... Adder, 11, 14... Binaural common circuit, 12, 15
...Binaural difference generation circuit, 13,16...90° virtual sound source generation circuit.

Claims (1)

[Claims] 1. Voltage level variable means for controlling the voltage level of a monaural electrical signal, reverberant sound generating means for generating a monaural reverberant signal, and time delay generating signals having two or more different delay times. 1. An indirect sound generating device comprising voltage level variable means for controlling the voltage level of the output of the time delay device and the time delay device, and generating a two-channel stereo signal via these circuit means. 2. In the indirect sound generating device according to claim 1, the output of the voltage level variable means for controlling the voltage level of the output of the time delay device is set to 0 ^{to 0} in front of the listener, and the sound image is localized in the left and right directions at 90 degrees. An indirect sound generation device characterized in that a two-channel stereo signal is created through a sound source creation circuit and an adder that mixes into two channels.