JPH0260200B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of the Invention] The present invention relates to a reverberation effect device, and particularly to a device capable of obtaining reverberant sound with clear sound image localization.

[Background of the invention]

FIG. 8 shows a conventional reverberation effect device. The apparatus shown in the figure is composed of three reverberation units 1, 2, and 3, and an adder 4 that adds the outputs of these reverberation units 1-3. Reverb unit 1 is a delay means with an intermediate delay time, and reverb units 2 and 3 are delay means with longer and shorter delay times than reverb unit 1, respectively.

In the apparatus shown in FIG. 1, an input signal is applied to the reverberation unit 1 at the first stage, and delayed signals each having a predetermined delay time are created in each reverberation unit 1, 2, and 3, and are combined by an adder 4. An output signal is obtained. This output signal is applied to a sounding device 5 having an amplifier, a speaker, etc., and a sound with a reverberation effect added is produced.

However, with the device shown in Fig. 8, there is no particular problem when there is only one input signal, but when the input signals are provided from, for example, multiple electronic musical instruments, it is necessary to mix these multiple input signals in advance. Applied to reverb unit 1. As a result, the same reverberation effect is applied to multiple input signals, and the sound image localization for each input signal is not clear.
There was an inconvenience that only a reverberation effect with a blurred sound image and a poor sense of depth and spaciousness could be obtained.

[Purpose of the invention]

This invention was made in view of the problems with the conventional type mentioned above, and it makes the sound image localization of reverberant sound clear for each input signal, and creates a reverberation effect with a sense of spaciousness and depth without blurring the sound image. The purpose is to make it possible to obtain.

[Summary of the invention]

The present invention provides an independent delay time to each of the plurality of input signals by supplying an input signal to at least one delay means at the first stage and the second stage of the plurality of delay means connected in series. It is characterized by

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows the configuration of a reverberation effect device according to an embodiment of the present invention. The device in the figure includes reverb units 6, 7, 8, adders 9, 10, and multiplier 1.
1, 12, 13, input terminals IN1, IN2, IN3, and an output terminal OUT. The first input signal (input 1) applied to input terminal IN1 is input to multiplier 1.
1 to a reverberation unit 6, and the output of the reverberation unit 6 is applied to one input of an adder 9. The other input of adder 9 is an input terminal.
A second input signal (input 2) applied to IN2 is inputted via multiplier 12, and the output of adder 9 is applied to the input of reverberation unit 7. The output of the reverb unit 7 is applied to one input of the adder 10, and the third input signal (input 3) applied to the input terminal IN3 is applied to the other input of the adder 13.
The output of the adder 10 is applied to the input of the reverberation unit 8. Then, the output signal of the reverb unit 8 is taken out via the output terminal OUT and supplied to a sound generating device (not shown). Each reverb unit 6, 7, 8 has, for example, a medium delay time T ₁ , a longer delay time,
T ₂ (T ₂ > T ₁ ) and shorter delay time T ₃ (T ₃ <
T ₁ ), and each multiplier 11, 12,
13 are coefficients g ₁ , g ₂ , g ₃ for the input signals, respectively.
It is used to multiply .

Each reverberation unit 6, 7, 8 used in the apparatus shown in FIG. 1 is constituted by, for example, a digital filter shown in one of FIG. 2a, b, or c. FIG. 2a shows an all-pass filter including delay circuits 14 and 15, adders 16 and 17, multiplier 18, and
19. Note that each multiplier 1
The multiplication coefficients g ₄ and g ₅ of 8 and 19 are smaller than "1" in absolute value. FIG. 2b shows a comb filter comprising delay circuits 20 and 21, an adder 23, and a multiplier 24, each having a predetermined delay time. Note that the multiplication coefficient g ₆ of the multiplier 24 also has an absolute value smaller than "1". Figure 2c shows a delay circuit with a delay line 25 with a tap.
and an adder 26 which combines the outputs from each tap of the delay line 25. The reverb units 6, 7, and 8 are shown in Fig. 2 a to c.
The present invention is not limited to the one shown in 1, but may have various configurations. For example, a plurality of filters such as a low-pass filter and a high-pass filter may be combined.

When the reverb units 6, 7, and 8 shown in Fig. 1 are constructed using digital filters as described above, it is necessary to make the signals applied to the input terminals IN1 to IN3 digital signals. Suitable for use in combination with digital electronic musical instruments. If the input signal is an analog signal, it is recommended to apply it to the input terminals IN1 to IN3 via an AD converter, or to use an analog type signal for each reverb unit 6, 7, and 8. .

In the reverberation effect device configured as described above, an independent delay time is given to each input signal, and sound image localization corresponding to each input signal is obtained as shown in FIG. 3. Therefore, if, for example, musical tone signals from multiple electronic musical instruments or multiple musical tone signals with different tones, etc. from one electronic musical instrument are input to each input terminal IN1 to IN3, each musical tone signal can be input independently. This provides sound image localization and provides reverberant sound effects with a clear sense of spaciousness and depth. Note that the signals applied to each input terminal IN1 to IN3 do not necessarily have to be different from each other.
Furthermore, in the apparatus shown in FIG. 1, by appropriately providing feedback circuits FL1, FL2, FL3 as shown by dotted lines, it becomes possible to obtain a more natural reverberation sound effect.

FIG. 4 shows a detailed circuit configuration that embodies the circuit shown in FIG. In the configuration of FIG. 4, parts that are the same as the device of FIG. 1 are designated with the same reference numerals. In the figure, SD is a delay element of one sampling time, and AO1, AO3... and BO
3, BO6, . . . are delay elements that provide a delay of a predetermined time, and the delay times of each delay element may be the same or different.

The reverb unit 6 is composed of filters having predetermined frequency characteristics, that is, frequency filters 27 and 28 and two-stage all-pass filters 29 and 30. The reverb unit 7 is composed of double all-pass filters 31 and 32, and the reverb unit 8
is composed of triple all-pass filters 33, 34, and 35.

FIG. 5 shows a one-multiply all-pass filter used in the circuit of FIG. 4. The transfer function H(Z) of this 1-multiply all-pass filter is H(Z)=g+z ^- m/1+gz ^- m...(1), and the frequency characteristic H(e ^j Ω) is H(e ^j Ω)= (g+cosΩm)−j sinΩm/(1+
gcosΩm)−jgsinΩm ……(2). Therefore, the squared amplitude characteristic |H(e ^j Ω)|
² is |H(e ^j Ω)|=1 (3), which is a constant value independent of frequency, and exhibits the characteristics of an all-pass filter.

FIG. 6 shows a reverberation effect device according to another embodiment of the invention. The apparatus shown in FIG. 1 has two channels, that is, two lines, of the reverberation effect device shown in FIG. 1, so that a stereo effect can be obtained at the same time as a reverberation effect.

In the device shown in Fig. 6, as shown in Fig. 7, a reverberation sound effect with two-dimensional sound image localization can be obtained independently for each input signal, and a clear sense of spaciousness and depth can be achieved. becomes possible.

In each of the above embodiments, the reverberation unit is constructed from a digital filter, but these may be constructed from a delay element such as a shift register or a random access memory.
Furthermore, it is also possible to configure using analog delay elements such as BBD and CCD.

〔Effect of the invention〕

As described above, according to the present invention, an independent delay time can be given to each input signal with a simple configuration, and clear sound image localization can be obtained for each input signal. Moreover, this provides a reverberation sound effect that has a sense of spaciousness and depth without haze, making it possible to realize a more natural reverberation effect.

[Brief explanation of drawings]

FIG. 1 is a block circuit diagram showing a reverberation effect device according to an embodiment of the present invention, and FIGS. 3 is a diagram for explaining the reverberation effect obtained by the device shown in FIG. 1, FIG. 4 is a circuit diagram showing a detailed example of the circuit configuration of the device shown in FIG. 1, and FIG. A block circuit diagram showing the configuration of an all-pass filter used in the circuit; FIG. 6 is a block circuit diagram showing the configuration of a reverberation effect device according to another embodiment of the present invention;
FIG. 7 is a diagram for explaining the reverberation effect obtained by the apparatus shown in FIG. 6, and FIG. 8 is a block circuit diagram showing a conventional reverberation effect apparatus. 6, 7, 8: reverb unit; 9, 10: adder; 11, 12, 13: multiplier.

Claims (1)

Claims: 1. A reverberation effect device comprising a plurality of delay means connected in series, each of which supplies an input signal to the first stage delay means and at least one second stage delay means. 2. The reverberation effect device according to claim 1, wherein the input signals supplied to each of the delay means are mutually different signals. 3. The reverberation effect device according to claim 1, wherein the output of any one of the plurality of delay means is fed back to the input side of a delay means at a stage preceding the delay means.