JPH06202629A - Effect granting device for musical sound - Google Patents

Abstract

PURPOSE:To dynamically vary the effect of an artificial stereophonic circuit, which give a feeling of extent to a monaural musical sound signal, during a musical performance. CONSTITUTION:The composition ratio when the monaural signal and a delay signal delayed by delay 1 are put together by addition (subtraction) by adders 6 and 7 is determined by coefficients A and (1-A) inputted to multipliers 2 and 3 and multipliers 4 and 5. This coefficient is varied with time to vary the degree of the feeling of extent of a musical sound with time. A modulation signal A and its complementary number 1-A are used as the coefficient and square root arithmetic parts 8 and 9 calculates the square roots of those values so that the effective value do not vary even after both the signals are put together by addition.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a musical tone effect imparting device for imparting a feeling of expansiveness to a musical tone formed by an electronic musical instrument or the like.

[0002]

2. Description of the Related Art A musical tone signal of an electronic musical instrument is usually formed in monaural. An example of a device that gives a sense of expanse to a monaural tone signal is a pseudo stereo circuit. The pseudo stereo circuit inputs a monaural signal to the left and right channels and a phase conversion circuit such as a delay circuit. Furthermore, the signal whose phase has been changed by the phase conversion circuit is input to both the left and right channels. At this time, one channel is added to the first monaural signal to be combined, and the other channel is subtracted from the monaural signal to be combined so that the frequency characteristics of both channels have a complementary comb filter shape. By inputting a monaural signal to this circuit, the localization position of the sound image shifts to the left and right due to the frequency component, and a feeling of expanse is imparted to the musical sound. The degree of spread is determined by how much the signals whose phases are changed by the phase conversion circuit are added (subtracted) and combined.

[0003]

However, in such a conventional effect imparting circuit, the degree of effect is fixedly set.
It had the drawback that it couldn't be controlled dynamically, changing the feeling of spaciousness during the performance. Further, if the effect setting is changed (for example, if the addition and synthesis amount of the signal whose phase is changed in the pseudo stereo circuit is increased or decreased), the level of the synthesized tone signal, that is, the volume is changed. There was a drawback that the volume changed during the performance.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an effect imparting device capable of dynamically changing the effect of a feeling of spaciousness without changing the volume of the entire tone signal.

[0005]

According to the present invention, there is provided an effect imparting means for imparting a feeling of expanse to a musical tone signal to the extent indicated by a parameter, a control means for temporally varying the parameter, and a change in the parameter. Regardless of this, level adjusting means for adjusting the level of the tone signal output by the effect imparting means to a constant level is provided.

[0006]

The effect imparting device of the present invention is provided with an effect imparting means such as a pseudo stereo that imparts a sense of spaciousness to the musical tone signal,
The degree of the effect application, that is, the size of the feeling of spread is controlled by the parameter. This parameter is time-varying by the control means. As the parameter changes with time, the degree of the sense of spaciousness given to the musical tone signal increases or decreases with time. On the other hand, the level adjusting means adjusts the level of the musical tone signal so that the level of the musical tone signal is kept constant even if the spread of the musical tone signal changes. As a level adjustment method, the gain of the output stage may be adjusted according to the parameter, or a plurality of parameters may be normalized.

[0007]

1 is a block diagram of a pseudo stereo circuit according to an embodiment of the present invention. This pseudo-stereo circuit divides a tone signal input in monaural into left and right channels based on frequency components to give a spread of the tone. A tone signal (monaural signal) input in monaural (MONO) is input to the delay 1 and the multipliers 4 and 5. The multiplier 4 is connected to the right channel and the multiplier 5 is connected to the left channel.

From the delay 1, two taps are drawn from different positions and a tone signal (delayed signal) whose phase is changed by the delay is taken out. They are connected to the multipliers 2 and 3, respectively. Multiplier 2 is connected to the left channel,
The multiplier 3 is connected to the right channel.

That is, the delay signal of the multiplier 2 and the multiplier 5
The monaural signals of are added by the adder 6 and output as the left channel. In addition, the delay signal of the multiplier 3 is the multiplier 4
Is subtracted from the monaural signal by the adder 7 and output as the right channel. By connecting in this way, the frequency characteristics of the left and right channels (comb-shaped filters) can be made different, and the localization position becomes different depending on the frequency component. As a result, it is possible to output to the listener a musical sound with a sense of spaciousness in which the sound image is not concentrated at one point. In order to increase the feeling of expanse, the characteristics of the comb filter should be made strong. For this purpose, the adders 6 and 7 are used.
It suffices to increase the ratio of the delay signal in.

Here, the multipliers 2, 3, 4, and 5 are respectively supplied with coefficients for multiplying the tone signals (monaural signal and delay signal). The coefficient is generated based on the modulation signal A given from the outside. The modulation signal A is input to the complement calculator 10 and the square root calculator 8. The square root √A of the modulated signal obtained by the square root calculator 8 is used as a coefficient in the multipliers 2 and 3
Given to. In addition, the complement calculator 10 is 1 for the modulated signal A.
The complement (1-A) is calculated, and this complement is input to the square root calculator 9. The square root √ (1-A) of the complement of the modulated signal obtained by the square root calculator 9 is used as a coefficient in the multipliers 4 and 5
Given to.

FIG. 2 shows the relationship between A and √A, √ (1-A).
Shown in. Since the perceptual loudness of a musical sound is obtained by the effective value of the amplitude, the coefficient of the monaural signal √ (1-A)
And the coefficient √A of the delay signal are kept in a relationship such that the sum of squares becomes 1, the entire volume can be kept constant even if the coefficient is changed.

8 to 10, various values of A (A = 0, A
= 0.25, A = 0.5, A = 0.75, A = 1), the frequency characteristic of the adder 6 (adder 7) is shown. In the case of A = 0 and A = 1, the musical tone is completely biased to one side, so that the characteristic of the comb filter does not appear. The characteristics of the comb filter appear when A = 0.25, A = 0.5, and A = 0.75, but when A = 0.5 where A and 1-A are balanced, It can be seen that the characteristics become the most prominent and the feeling of spread becomes greater.

As the modulation signal, an operation amount output of an operator operated by the player may be input, an oscillation output of LFO or the like may be input, and an envelope signal generated by an envelope generator is input. You may.
As the low-frequency waveform oscillated by the LFO, for example, one as shown in FIG. 3 can be considered. The upper part of the figure shows the waveform of the signal input as the modulated signal A, and the lower part of the figure shows the complement (1
-A) is a waveform.

The square root calculators 8 and 9 are ROMs that output square root data using real number inputs as addresses.
(Square root table) may be used, or the square root can be calculated and output by using a digital circuit as shown in FIG.

FIG. 5 is a block diagram of an electronic musical instrument incorporating the pseudo stereo circuit. This electronic musical instrument has a keyboard section 2
0, a key depression detecting unit 21, a sound generation channel assigning unit 22, and a tone forming unit 23. The key depression detection unit 21 is the keyboard unit 20.
Is monitored and ON / OFF of each key, initial touch data, etc. are detected. These data are output from the key depression detecting unit to the tone generation channel assigning unit 22. The tone generation channel assigning unit 22 assigns a channel for forming a tone signal instructed by turning on the key from the tone generation channels of the tone forming unit 23. A key code, initial touch data, etc. are transmitted to the sounding channel. The musical tone forming unit 23 forms a monaural musical tone signal based on these data. The formed musical tone signal is input to the pseudo stereo circuit 24. The pseudo-stereo circuit 24 is similar to that shown in FIG. 1 and can dynamically control the feeling of musical tone broadening based on a modulation signal input from the outside. The pseudo-stereo circuit 24 has an operator 29,
One of the MIDI data generator 30, the LFO 31, and the envelope generator 32 is selectively connected. These devices are devices that output a modulation signal to the pseudo stereo circuit 24. These are connected to the selector 27, one of which is selected by the selection switch 28 and connected to the pseudo stereo circuit 24.

The musical tone signal which has been made stereo by the pseudo stereo circuit 24 and which is given a sense of expanse is D / A converter 25 (25
L, 25R) is converted into an analog signal and then emitted as a musical sound from the sound system 26L, 26R. As the D / A converters 25L and 25R, one D / A converter may be used in a time division manner.

As the operator 29, a pedal operator or a modulation wheel is used. The manipulated variable data of the manipulator 29 is used as it is as a modulation signal.
You may input into FO31 and may be used as a parameter which controls the amplitude and frequency of the low frequency signal which LFO31 oscillates. Further, as the MIDI data generator 30, an externally connected MIDI controller, sequencer, or the like can be applied. Further, the envelope generator 32 operates by using the key-on signal KON as a trigger to generate a modulation signal having a desired waveform.

FIG. 6 shows an example of another electronic musical instrument using the above pseudo stereo circuit. In this electronic musical instrument, the musical tone forming section 41
The panning circuit 4 outputs musical tone signals of a plurality of tones formed by
4a to 44n are used to localize at different positions. The tone forming section 41 forms tone signals of a plurality of tones simultaneously in a time division manner. The distributor 42 distributes and inputs the musical sound signals formed by the musical sound forming unit 41 to the plurality of pseudo stereo circuits 43a to 43n in accordance with the time division timing. The control unit 40 controls the operations of the tone forming unit 41 and the distributor 42. Pseudo stereo circuits 43a to 43
n has the same structure as that shown in FIG. 1, and is for distributing the musical tone signal to stereo and for giving a feeling of expanse. The stereo tone signals output from the pseudo stereo circuits 43a to 43n are output to the panning circuits 44a to 44n. The panning circuit 44 localizes the sound image at a predetermined position by adjusting the volume balance of the left and right channels of the stereo tone signal. Panning circuit 44a
FIG. 7 shows an example in which a plurality of timbres are localized at different positions by using .about.44n. Panning circuits 44a-44
The tone signals output from n are added and synthesized by the adders 45L and 45R for each of the left and right channels and output as a stereo signal.

In FIG. 7, the tone signal localized at a predetermined position has a pseudo-stereo circuit 43a centered at the localization position.
The sound image is expanded / reduced based on the spread feeling control of ~ 43n.

In this case, it is natural and effective that the sense of expanse of the pseudo stereo is not increased so much as it is slightly wider than that of monaural, and the sense of expanse is changed within the range.

In the above embodiment, the pseudo stereo circuit using the delay 1 has been described, but the method is not limited to this, and the pseudo stereo circuit using the phase inversion circuit, the π / 2 phase circuit or the like is similarly applied. It is possible.

[0022]

As described above, according to the present invention, it is possible to give a sense of expanse to a tone signal input in monaural, and further to change the sense of expanse with time.

Further, the volume as a whole does not change even if the feeling of spread is changed.

[Brief description of drawings]

FIG. 1 is a block diagram of a pseudo stereo circuit that is an embodiment of the present invention.

FIG. 2 is a diagram showing an output of a root portion of the pseudo stereo circuit.

FIG. 3 is a diagram showing an example of a modulation signal input to the pseudo stereo circuit.

FIG. 4 is a diagram showing an example of a route circuit used in the pseudo stereo circuit.

FIG. 5 is a diagram showing an example of an electronic musical instrument using the pseudo-stereo circuit.

FIG. 6 is a view showing another example of an electronic musical instrument using the pseudo stereo circuit.

FIG. 7 is a diagram showing changes in sound image localization and a feeling of spaciousness in the electronic musical instrument.

FIG. 8 is a diagram showing output frequency characteristics of an adder in the pseudo stereo circuit.

FIG. 9 is a diagram showing output frequency characteristics of an adder in the pseudo stereo circuit.

FIG. 10 is a diagram showing output frequency characteristics of an adder in the pseudo stereo circuit.

[Explanation of symbols]

 1-delay 2,3,4,5-multiplier 6,7-adder 8,9-square root calculator 10-complement calculator

Claims (1)

[Claims] 1. An effect imparting means for imparting a feeling of expanse to a musical tone signal to the extent indicated by a parameter, a control means for temporally varying the parameter, and an effect imparting means for outputting regardless of a change in the parameter. And a level adjusting means for adjusting the level of a musical tone signal to be constant, and a musical tone effect imparting apparatus.