JPH0749690A - Musical sound processing device - Google Patents

Abstract

PURPOSE:To add corresponding tone colors to chord and single tone playing. CONSTITUTION:Each musical sound signal from each musical sound generating means is synthesized by an adder 26 and is supplied to a chorus circuit 28. Each musical sound envelope is detected by envelope detection circuits 34, 36 and 38 and is synthesized by an adder 40. Output signals of the adder 40 are converted to numerical values by a numerical value converter 42, supplied to the circuit 28 and the added condition of the chorus is controlled.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a musical sound processing apparatus,
In particular, it relates to those that process tones.

[0002]

2. Description of the Related Art Conventionally, there are a chorus device and a distortion device as a musical tone processing device. The chorus device
The input tone signal is modulated to change the tone color. Further, the distortion device distorts the inputted musical tone signal to change the timbre.

[0003]

In the conventional chorus device, modulation is performed with a constant modulation degree irrespective of the level of the musical tone signal to be input. Although it is a timbre, the outline of the sound becomes blurred when a single note is deeply modulated. In addition, when a shallow modulation is applied for playing a single note, there is a problem in that the heavyness is not sufficient for playing a chord. That is, it is unreasonable to deal with all performance styles with a constant degree of modulation.

In order to solve this problem, the level of an input musical tone signal is judged, and when the level is high, the degree of modulation of the chorus device is increased, and when the level is low, the degree of modulation of the chorus device is decreased. A method is conceivable, but this uses the tone signal that is input as a chord signal, so the phase relationship of each tone that makes up the chord is
When they are in a relationship of canceling each other, the determined level becomes small, and a new problem occurs that a sufficient chorus effect cannot be obtained.

Further, in the conventional distortion device,
Distorts the input musical tone signal into a waveform close to a rectangular wave,
The duty ratio was only about 50, and there was a problem that the change in timbre was poor.

[0006]

In order to solve each of the problems described above, the first aspect of the present invention provides a tone input means for inputting a plurality of tones and a plurality of tone signals input to the input means. Envelope information input means for inputting a plurality of corresponding envelope information, first synthesizing means for synthesizing a plurality of tone signals input from the tone input means, and a plurality of envelope information input from the envelope information input means And a effect adding means for adding an effect to the output signal of the first combining means and controlling the added state of the effect according to the output signal of the second combining means. To do.

A second aspect of the invention is a delay means for delaying a musical tone signal, a synthesizing means for synthesizing the musical tone signal and a delayed output signal of the delaying means, and a pitch detecting means for detecting the pitch of the musical tone signal. And a delay amount determining means for determining a delay amount equal to or less than the pitch detected by the pitch detecting means and supplying the delay amount to the delay means.

A third aspect of the invention comprises a waveform converting means for generating a converted output signal in which the phase of the musical tone signal is changed, and a synthesizing means for synthesizing the musical tone signal and the converted output signal. .

[0009]

According to the first aspect of the invention, the plurality of tone signals input from the tone input means are combined by the first combining means. On the other hand, a plurality of envelope information corresponding to the input plurality of tone signals are input from the envelope information input means and combined by the second combining means. The effect adding means adds the effect to the output signal of the first combining means, and the addition state of the effect is controlled according to the output signal of the second combining means. That is, instead of detecting the synthesis level of the chord signal, for example, the envelope information of each musical tone forming the chord is synthesized, and the effect adding means is controlled by this, so that the effect depends on the phase relationship of a plurality of musical tone signals. The state of not being fully added does not occur.

According to the second aspect of the invention, the musical tone signal is delayed by the delaying means, and the original musical tone signal is synthesized by the synthesizing means. Then, the delay amount in the delay means is
The delay amount determining means arbitrarily determines a value equal to or smaller than the pitch of the tone signal.

In the third invention, the tone signal is changed in phase by the waveform converting means and is output as a converted output signal. The converted output signal and the musical sound signal are combined by the combining means.

[0012]

EXAMPLE In this example, the present invention is applied to, for example, an electric guitar. As shown in FIG.
Is provided. These pickups 10 are provided for each string of the electric guitar and pick up the vibration of each string as a string vibration signal. The picked-up string vibration signal is time-divided A / A through a multiplexer (not shown).
The digital string vibration signal is supplied to the D converter 12 and sequentially converted into a digital string vibration signal. The digital string vibration signal is supplied to a digital signal processing device (DSP) 14 where it is processed and then D / A converted. It is converted into an analog signal by the device 16 and supplied to the acoustic means 18 constituted by an amplifier, a speaker and the like. The DSP 14 is controlled by the CPU 20, and the CPU 20 detects the operation state of the operator 22 attached to the DSP 20 and D
The SP 14 is controlled and the detection result is displayed on the display means 24.

FIG. 1 is a block diagram showing a chorus device realized by the DSP 14. The digital string vibration signal detected by each pickup 10 and digitized by the A / D converter 12 is input terminal 331. , 33
It is supplied to the combining means, for example, the adder 26 via 2,333. Although FIG. 1 shows that only three digital string vibration signals are input to the adder 26, digital string vibration signals detected in all strings may be input in reality.

The addition output signal of the adder 26 is supplied to effect adding means, for example, a chorus circuit 28. The chorus circuit 28 has a delay circuit 30, an adder 32, a multiplier 41, and a low frequency signal generator (hereinafter referred to as LFO) 43, and the delay circuit 30 is supplied with the addition output signal of the adder 26. The delay output signal of the delay circuit 30 and the addition output signal of the adder 26 are added by the adder 32.

The delay circuit 30 is composed of a plurality of stages, and the delay amount is changed by changing from which stage counting from the input stage the delayed output is extracted. Note that the number of stages from which the delay output is extracted can also be extracted from the number of stages represented by a decimal point by performing interpolation calculation.

The delay amount is modulated by the modulation signal (for example, a low frequency sine wave signal) supplied from the LFO 43 through the multiplier 41, and the chorus effect is added to the output signal from the output terminal 334. become.

The variation width of the delay amount, that is, the depth of the modulation degree of the chorus is controlled by the envelope detectors 34, 36 and 38, the synthesizing means such as the adder 40, and the numerical converter 42. Therefore, the depth of the modulation degree is controlled by controlling the level of the modulation signal output from the LFO 43 in the multiplier 41 by the output signal of the numerical converter 42.

The envelope detectors 34, 36 and 38 are
The envelope of each digital string vibration signal from the A / D converter 12 is detected, and the detected envelope signals are added by the adder 40.

The addition output of the adder 40 is the numerical converter 4
2 is supplied. The numerical converter 42 is composed of, for example, a table memory, and supplies the delay amount change width designation signal corresponding to the addition output from the adder 40 to the multiplier 41. The multiplier 41 multiplies the waveform generated by the LFO 43 by the delay amount change width designation signal, supplies the output to the delay circuit 30 as a delay amount determination signal, and controls the delay time in the delay circuit 30.

Therefore, the delay amount change of the delay circuit 30 is set to the delay amount change width corresponding to the added value of each envelope at that time, and when the added value of the envelope is a large value, a large delay amount change width, that is, a deep delay amount. Is the degree of modulation,
When the added value of each envelope is a small value, the change amount of the delay amount is small, that is, the modulation degree is shallow.

For example, in the case of playing chords, the added value of the envelope of each musical tone becomes a large value, so that deep modulation can be applied and a heavy chorus effect can be obtained. Moreover, since the envelopes detected by the envelope detectors 34, 36, and 38 are added, the added value is not affected by the phase of each string vibration signal, and the delay amount is determined based on this added value. Therefore, it is not affected by the phase of each musical sound that constitutes the chord. On the other hand, in the case of playing a single note, the added value of the envelope becomes a small value, so that shallow modulation can be applied and a sharp chorus effect can be obtained.

In FIG. 1, the chorus circuit 28 is used as the effect adding means, but other effect adding means such as a ring modulator circuit, a vibrato circuit, a tremolo circuit, etc. can be used. Further, although the modulation degree is changed in FIG. 1 because the chorus circuit is used, the modulation frequency and the modulation waveform may be changed based on the output signal of the numerical value converter 42 when another effect adding circuit is used.

In the circuit shown in FIG. 1, since the present invention is applied to the electric guitar, the envelope information is stored in the envelope detector 3.
4, 36, 38, the synthesizer generally has an envelope generating means in addition to the musical sound generating means. Therefore, the envelope detecting means 34, 36, 38 as shown in FIG. The envelope signal generated from the envelope generating means may be input and this envelope signal may be added by the adder 40.

FIG. 3 is a block diagram showing a distortion device realized by the DSP 14.
This distortion device is provided for each pickup 10. The digital string vibration signal is supplied to the distortion circuit 44 and is distorted.

For example, when a signal obtained by digitizing a sine wave signal as shown in FIG. 4A is supplied to the distortion circuit 44 as a digital string vibration signal, a rectangular wave signal as shown in FIG. 4B is obtained. It is output from the distortion circuit 44. Here, the distortion circuit 4
The output signal from No. 4 has a ratio (duty ratio) between the cycle T and the positive period T1 of 50%.

The output signal of the distortion circuit 44 is supplied to the delay circuit 46. Similar to the delay circuit 30 of FIG. 1, the delay circuit 46 also has a plurality of stages, and the delay amount can be changed depending on from which stage the input stage outputs.

In order to determine the delay amount in the delay circuit 46, the pitch of the input digital string vibration signal is detected by the pitch detection circuit 48 and supplied to the delay amount determining means, for example, the constant multiplication circuit 50. This constant multiplication circuit 50 is provided with a CP by operating the operator 22, for example, in FIG.
The constant x supplied from U20 is supplied. This constant x takes a value of 0 <x <1, and the constant multiplication circuit 5
0 multiplies the pitch detected by the pitch detection circuit 48 by a constant x.

For example, if the constant x is 0.25, the constant multiplication circuit 50 supplies a value obtained by multiplying the pitch detected by the pitch detection circuit 48 by x to the delay circuit 46 as a delay amount determination signal. In this case, the output signal of the distortion circuit 44 is 1 /
An output signal delayed by 4 pitches is output.

The output signal of the distortion circuit 44,
The delayed output signal of the delay circuit 46 is supplied to a synthesizing unit such as a comparison and output circuit 52. The comparison and output circuit 52 sequentially compares the output signal of the distortion circuit 44 and the delayed output signal of the delay circuit 46, and when the two values are equal, the value is set, and when the two values are different, the larger value is set. It is what is output.

Therefore, for example, as is apparent from FIGS. 4B and 4C, the output signal (positive peak) of the distortion circuit 44 is larger than the delayed output signal (negative peak value) of the delay circuit 46. In the period t1, the output signal of the distortion circuit 44 is output as shown in FIG. In the period t2 in which the output signal of the distortion circuit 44 has a positive peak value equal to the delayed output signal of the delay circuit 46, both values are output.

During a period t3 when the output signal (positive peak value) of the delay circuit 46 is larger than the output signal (negative peak value) of the distortion circuit 44, the output signal of the delay circuit 46 is output, and both values are output. In the period t4 when the peak value is negative, both values are output.

Therefore, as shown in FIG. 4D, the duty ratio T2 / T of the output signal of the comparison and output circuit 52 is equal to the duty ratio T1 / T of the output signal of the distortion circuit 44.
It is larger than T and becomes 75%. This duty ratio T2 /
T can be changed by changing the value of x supplied to the constant multiplication circuit 50. Therefore, by changing the value of x, a variety of timbre changes can be achieved.

In the circuit of FIG. 3, when the output signal of the delay circuit 46 is output, for example, in the period t3, the output signal of the delay circuit 46 is output as it is, but an appropriate constant for the output signal of the delay circuit 46 is used. May be multiplied and output, and a stepped waveform as shown by the alternate long and short dash line in FIG. 4C may be output.

In the circuit of FIG. 3, the comparison and output circuit 52 outputs the larger value when the output of the distortion circuit 44 and the output of the delay circuit 46 are different from each other. You may make it output.

In the circuit of FIG. 3, the comparison and output circuit 52 is used as the synthesizing means, but instead of this, an adder and an AND circuit are used.
A circuit or an OR circuit or the like can also be used.

In the circuit of FIG. 3, the distortion circuit 44 is provided to obtain the distortion effect. However, for example, the distortion circuit 44 is removed and the constant x supplied to the constant multiplication circuit 50 is changed by the output of the LFO. It is also possible to obtain the effect of pulse width modulation by changing or by changing the envelope detected from the tone signal supplied to the comparison and output circuit 52.

Further, in the circuit of FIG. 3, the delay circuit 46
Although the constant multiplication circuit 50 is used, a waveform conversion means constituted by, for example, a table memory is provided instead of these, and the waveform corresponding to the pitch information from the pitch detection circuit 48 is set by the operation of the operator 22. The phase may be delayed for the period to output the signal. Also in this case, various modifications as described above are possible.

[0038]

As described above, according to the first aspect of the present invention,
The plurality of tone signals from the tone signal input means are synthesized by the first synthesizing means, and the effect is added to the synthesized output by the effect adding means. The effect addition state is controlled by the envelope information input means. Since the envelope information of each input musical tone signal is controlled in accordance with the synthesized output signal synthesized by the second synthesizing means, a state in which the effect is not sufficiently added due to the phase relationship of a plurality of musical tone signals does not occur, The state of the effect to be added changes depending on the number of tone signals generated at the same time, and the change of the tone color can be made different.

In the second and third aspects of the invention, the original musical tone signal and the delayed or phase-shifted musical tone signal are synthesized by the synthesizing means, so that the synthesized output signal is the original musical tone signal. The waveform becomes different from that of, and the change of the timbre can be increased.

[Brief description of drawings]

FIG. 1 is a block diagram of a chorus device according to an embodiment of a musical sound processing apparatus according to the present invention.

FIG. 2 is a block diagram of the entire embodiment.

FIG. 3 is a block diagram of a distortion device according to the embodiment.

FIG. 4 is an operation explanatory view of the distortion device of FIG.

[Explanation of symbols]

26 adder (first synthesizing means) 28 chorus circuit (effect adding means) 34 36 38 envelope detecting circuit (envelope information input means) 40 adder (second synthesizing means) 46 delay circuit (delaying means) 48 pitch detection Circuit (pitch detection means) 50 Constant multiplication circuit (delay amount determination means) 52 Comparison and output circuit (synthesis means) 331 332 333 Input terminal (tone signal input means)

Claims (3)

[Claims] 1. A musical sound inputting means for inputting a plurality of musical sounds,
Envelope information input means for inputting a plurality of envelope information corresponding to a plurality of tone signals input to the input means, first synthesizing means for synthesizing a plurality of tone signals input from the tone input means, and Second synthesizing means for synthesizing a plurality of envelope information input from the envelope information inputting means, and an effect is added to the output signal of the first synthesizing means, and the added state of the effect is added to the output signal of the second synthesizing means. A musical sound processing apparatus comprising: an effect adding unit that controls according to the above. 2. A delay means for delaying a musical tone signal, a synthesizing means for synthesizing the musical tone signal and a delayed output signal of the delaying means, a pitch detecting means for detecting a pitch of the musical tone signal, and the pitch detecting means. And a delay amount determining means for determining a delay amount equal to or less than the pitch detected by the above and supplying the delay amount to the delay means. 3. A musical tone processing apparatus comprising: a waveform converting means for generating a converted output signal in which the phase of the musical tone signal is changed; and a synthesizing means for synthesizing the musical tone signal and the converted output signal.