JPH06161462A - Sound source device of electronic musical instrument - Google Patents

Abstract

PURPOSE:To synthesize a musical sound of sound quality including a complex spectrum by enabling a signal generated in each closed loop to control delay times of delay means of other closed loops. CONSTITUTION:Respective musical sound generation systems 1 and 2 have exciting waveform generation parts 111 and 211 which generate exciting waveforms, noise generation parts 112 and 212 which generate noise waveforms, and loop circuits 100 and 200 which input initial waveforms including the noise waveforms; and those musical sound generation systems 1 and 2 generate respective musical sound signals while affecting each other. Then a delay part 215 and an interpolation part 216 vary in delay time each time data passes through a filter part 117. The delay of a delay circuit 115 and an interpolation part 116 is controlled with stage quantity data D1. Therefore, the loop circuits 100 and 200 synthesize musical sounds in the audible band, so the frequency modulation functions to vary the timbre similarly to FM musical sound synthesis and complex harmonics ate generated by cyclic mutual operation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sound source device for synthesizing a musical tone waveform of an electronic musical instrument.

[0002]

2. Description of the Related Art Conventionally, as a sound source device used in an electronic musical instrument, an FM (Frequency) which produces a harmonic component by modulating a sine wave read from a memory.
Modulation) Synthesis method is known. However, this method has a strong impression of being a mathematical inorganic substance, and it has been difficult to generate a natural musical tone close to that of a natural musical instrument. Therefore, instead of synthesizing waveforms by modulation in this way, a model obtained by operating the model obtained by simulating the sounding mechanism of a natural musical instrument and thereby synthesizing the musical sound of a natural musical instrument has been studied. It was This type of device is disclosed, for example, in Japanese Examined Patent Publication No. Sho 58-4810.
No. 9 publication and the like. In this device, an initial waveform having many frequency components such as impulses is injected into a loop circuit including a delay circuit and a filter, and a signal circulating in the loop circuit is taken out as a tone signal. . According to this sound source device, each frequency component of the initial waveform injected into the loop circuit is attenuated according to the frequency characteristic of the filter every time it passes through the filter. As a result, a damping sound whose tone color changes with time is obtained from the loop circuit.

[0003]

By the way, in the above-described conventional sound source device, since the initial waveform circulates in the loop circuit, all signals other than the fundamental sound component of the predetermined frequency and its overtone component are removed. Therefore, there is a problem that the tone quality of the obtained musical tone becomes poor.

The present invention has been made under such a background, and provides a tone generator device of an electronic musical instrument capable of synthesizing a musical tone of rich sound quality including a complex spectrum by tone synthesizing by a delay loop. The purpose is to provide.

[0005]

According to the sound source device of an electronic musical instrument of the present invention, an excitation means for outputting an excitation signal based on an input signal and a feedback signal, and a delay processing for the excitation signal for output. And a delay means, the delay time of the delay means is controlled by a signal generated by a delay process in another closed loop, and the control is mutually performed among the plurality of closed loops. It is characterized by that.

[0006]

According to the above construction, since the signal generated in each closed loop controls the delay time of the delay means of another closed loop, the spectrum of the tone signal output from each closed loop can be increased.

[0007]

【Example】

§1. Configuration of Embodiment (a) Schematic Configuration An embodiment of the present invention will be described below with reference to the drawings. 1 is a block diagram showing a configuration of a tone generator device of an electronic musical instrument according to an embodiment of the present invention, and FIG. 3 is a block diagram showing a control information generating means for each unit of the tone generator device shown in FIG. The tone generator of this embodiment has two tone forming systems 1 and 2. As shown in FIG. 1, the musical tone forming system 1 (2) of each series is composed of a. Excitation waveform generation unit 111 (21 that generates an excitation waveform)
1) b. A noise generator 112 (21 that generates a noise waveform
2) and c. It has a loop circuit 100 (200) to which an initial waveform including an excitation waveform and a noise waveform is inputted, and these tone forming systems 1 and 2 respectively form tone signals while mutually affecting each other. is there.

(B) Control Unit 90 Next, the control information generating means in this embodiment will be described. As shown in FIG. 3, the electronic musical instrument according to this embodiment is provided with a performance operator 70 such as a keyboard and a tone color operator 80. The control unit 90 outputs control information for controlling the operation of the sound source device (FIG. 1) based on the operation information obtained from each of these operators. The control information output by the control unit 90 includes the control information common to each of the tone forming systems 1 and 2 described above and the control information output corresponding to each of the tone forming systems 1 and 2. The control information output by the control unit 90 will be listed below. A. Control information common to each series (1) Key-on signal KON: This is output during a key depression operation on the keyboard. By outputting this key-on KON, the tone generator starts to form a musical sound. (2) Touch information TOUCH: information indicating a touch when a key is pressed. The touch information TOUCH controls the excitation waveform, the noise intensity, and the amplitude of the envelope given to each series of tone signals in both tone forming systems 1 and 2. B. Control information generated for each series (3) Waveform designation information WAVE1, 2: Excitation waveform generator 1
This is information for designating each excitation waveform generated by 11 and 211. These pieces of waveform designation information WAVE1 and WAVE2 are determined based on the tone color numbers designated by the tone color designation operator 1. (4) Noise information NCONT1, 2: white noise,
This is information that specifies the type of each noise generated by the noise generators 112 and 212, such as pink noise. The noise information NCONT1, 2 is determined based on the tone color number designated by the tone color designation operator 70. In addition,
The tone color may be set independently of the tone color. (5) Excitation waveform weighting coefficients MIXW1, 2 are coefficients for controlling the amplitude of the excitation waveform of each series, and those corresponding to the set tone color are output. The tone color may be set independently of the tone color. (6) Noise weighting coefficients MIXN1, MIX2 are coefficients for controlling the amplitude of noise in each series, and those corresponding to the set tone color are output. The tone color may be set independently of the tone color. (7) Frequency information FREQ1,2: excitation waveform generator 11
This is information for designating the frequencies of the respective excitation waveforms 1 and 211 generated. These frequency information FREQ1 and FREQ2 are determined based on the key code of the pressed key. In addition,
The tone pitch is determined by the following PITCH1 and 2, and the frequency information FREQ1 and FREQ2 influence the timbre. Therefore, it may be set independently of the key code. (8) Pitch information PITCH1,2: Information for controlling the delay times in the loop circuits 100, 200 of the respective series, and is determined based on the key code of the pressed key. (9) Tone color information TC1, 2: Loop circuit 10 of each series
This is information for controlling each filter coefficient in the filters within 0, 200, and information corresponding to the set tone color is output. (10) Envelope parameters EGP1, 2 are information for controlling the envelopes given to the musical tone signals of each series. These envelope parameters EG
As P1 and P2, those corresponding to the set tone color may be output, or P1 and P2 may be set independently of the tone color. (11) Attenuation coefficient FG1, 2: Loop circuit 10 of each series
It is a coefficient for controlling the attenuation amount of each signal at 0,200. As the attenuation coefficients FG1 and FG2, those corresponding to the set tone color may be output, or may be set independently of the tone color.

Next, with reference to FIG. 1, a specific configuration of the sound source device according to this embodiment will be described. This tone generator has two tone forming systems 1 and 2. The components of the tone forming system 1 are numbered in the 100s and the tone forming system 2
The constituent elements of are numbered in the 200s. Further, the mutually corresponding elements in each of the tone forming systems 1 and 2 are designated by the same reference numerals in the tens and lower places.
Therefore, only the tone forming system 1 will be described below, and the tone forming system 2 will be described.
Is omitted.

(C) Configuration of Musical Sound Forming System 1 <Initial Waveform Generating System> The excitation waveform generating section 111 stores a plurality of types of excitation waveforms for each one cycle, for example, and performs the following processing. (1) The type of excitation waveform to be generated is selected based on the waveform designation information WAVE1. (2) Waveform designation information W based on frequency information FREQ1
The frequency of the waveform selected by AVE1 is determined. (3) The amplitude of the excitation waveform to be generated is determined by the touch information TOUCH. (4) When the key-on signal KON is input, the instantaneous value of the excitation waveform having the waveform type, frequency and amplitude determined above is generated and sequentially output in synchronization with the sampling clock φs.

The noise generating section 112 is provided with the noise information NCO.
The noise waveform whose type is designated by NT1 is output with an amplitude according to the touch information TOUCH, and each instantaneous value in the noise waveform is sequentially output in synchronization with the sampling clock φs. Reference numerals 113a and 113b denote multipliers. The multiplier 113a multiplies the output waveform from the excitation waveform generator 111 by the excitation waveform weighting coefficient MIXW1, and the multiplier 113b multiplies the output waveform from the noise generator 112 by the noise weighting coefficient. MIXN1 is multiplied. Reference numeral 114 denotes an adder, which adds the respective outputs of the multipliers 113a and 113b and outputs the result. These multipliers 113a and 113b and adder 11
4 configures a mixer that mixes the output signals of the excitation waveform generator 111 and the noise generator 112.

<Loop Circuit 100> Next, the loop circuit 1
00 will be described. Reference numeral 115 denotes a delay circuit, which is an integer part D1i of the stage number data D1 from the adder 121.
nt is input as information designating the delay time. The stage number data D1 will be described later. Then, the delay circuit 115 delays the input signal by the delay time D1int · τ and outputs it, when the period of the sampling clock φs is τ. Such a delay circuit having a variable delay time can be configured by a shift register that sequentially shifts an input signal according to the sampling clock φs, for example.
Further, such a delay circuit can also be configured using a RAM (random access memory). Reference numeral 116 denotes an interpolation unit, which receives the decimal part D1frac of the stage number data D1 from the adder 121. Then, the interpolation unit 116
The input waveform is delayed by the delay time D1frac · τ and output. FIG. 2 shows an example of the interpolation unit 116. As shown in FIG. 2, the interpolator 116 includes the one-unit delay circuit 3
1, multipliers 32 and 34, and an adder 33. The input signal I to be interpolated is directly input to the multiplier 34, delayed by one sampling period τ by the one-unit delay circuit 31, and input to the multiplier 32. That is, the multiplier 32 receives 1 more than the input signal I of the multiplier 34.
The data I-1 that is earlier by the sampling period τ is input. The data I-1 is multiplied by the data D1frac, the data I is multiplied by the data 1-D1frac as a multiplication coefficient, and each multiplication result is added by the adder 33.

Reference numeral 117 denotes a filter section, which is tone color information TC.
The frequency characteristic is controlled based on the filter coefficient FLT1 generated by 1, and the input signal is filtered in synchronization with the sampling clock φs. Reference numeral 118 denotes a multiplier, which multiplies the output signal of the filter unit 117 by the attenuation coefficient FG1 and thereby attenuates the output signal. 11
Reference numeral 9 denotes an adder, which outputs the output of the multiplier 118 and the adder 114.
And outputs the result to the delay circuit 115.

<Relationship Between Loop Circuits 100 and 200> On the other hand, the output signal from the filter unit 117 is the multiplier 12
It is also supplied to 0 and is multiplied by the modulation envelope signal MODENV1 described later. The output signal of the multiplier 120 is supplied to the adder 221 of the tone forming system 2 as the frequency modulation signal MOD2.

(D) Configuration of Control Information Conversion System Next, a circuit for converting the control information from the control unit 90 into information for directly controlling the above-mentioned units will be described. Reference numeral 40 denotes a pitch-delay data conversion unit, which is configured by a memory table or the like in which delay data DP1 and DP2 representing the delay amount are stored in correspondence with the pitch information PITCH1 and PITCH2. The pitch-delay data converter 40 receives the input pitch information PI.
TCH1 and TCH2, and a filter coefficient generator 50 described later
The delay data DP1 and DP2 based on the output signal of the adder 12
1 and 221 are output. This corresponds to the phase delay of the filter. The filter coefficient generator 50 receives the timbre information TC1 and TC2 and receives the timbre information TC1 and TC2.
Filter coefficient FLT for determining frequency characteristics of 7,217
1 and 2 are output to the filter units 117 and 217, and are also supplied to the pitch-delay data conversion unit 40. Reference numeral 60 denotes a modulation envelope generator, which generates a modulation envelope signal MODENV according to the key-on signal KON.
1 and 2 are generated. These modulated envelope signals MO
Waveforms of DENV1 and 2 are envelope parameters EG
It is determined by P1,2. The amplitudes of the modulation envelope signals MODENV1 and MODEN2 are determined by the touch information TOUCH. Modulation envelope signal MODENV1
Is multiplied by the output signal from the filter unit 117 by the multiplier 120 and added as a modulated signal MOD2 by the adder 221.
Is supplied to. Then, it is added to the delay data DP2 by the adder 221 and is supplied to the delay circuit 115 as the stage number data D1 for setting the delay time. The modulated envelope signal MODENV2 is output to the multiplier 220 and subjected to the same processing.

§2. Operation of the Embodiment (a) Tone Setting The operation of the sound source device according to this embodiment will be described below. When the operator sets a tone color by operating the tone color setting operator 70 shown in FIG. 3, the controller 90 outputs tone color information TC1 and TC2 corresponding to the tone color. Further, the waveform designation information WAVE1,2 corresponding to the set tone color, the excitation waveform weighting factors MIXW1,2, the noise weighting factor MIXN1,
2, envelope parameters EGP1, 2 and damping coefficients FG1, 2 are output. The tone color information TC1, 2 is output to the filter coefficient generation unit 50, and the filter coefficient generation unit 50 outputs the filter coefficients FLT1, FLT2 corresponding to the tone color information TC1, 2 to the filter units 117 and 217 and the pitch-delay data conversion unit 40. Output to.

(B) Sound Generation Instruction Next, when the keyboard of the performance operator 70 is depressed, the key depression information such as the key code is detected by the controller 90. Then, the control unit 90 causes the key-on signal KON.
And the generated frequency information FREQ1, 2 and pitch information P based on the key code in the key depression information.
ITCH1 and 2 are output. At the same time, touch information TOUCH indicating the touch of the key is also output.

Then, the pitch-delay data conversion section 40 causes the pitch information PITCH1, 2 and the filter coefficient F to be obtained.
Delay data DP1 and DP2 corresponding to LT1 and LT2 are output. Further, the key-on signal KON serving as a starter is output to the modulation envelope generator 60, and at the same time, the touch information TOUCH and the envelope parameter E are output.
GP1 and 2 are output. As a result, the modulation envelope generating unit 60 outputs the modulation envelope signal MODENV.
1 and 2 are supplied to multipliers 120 and 220, respectively.

(C) Tone formation <Loop circuits 100 and 200 Resonance start> The excitation waveform generator 111 selects and outputs the excitation waveform corresponding to the waveform designation signal WAVE1 when the key-on signal KON is input. Here, the frequency of the excitation waveform output by the excitation waveform generator 111 is determined by the generated frequency information FREQ1, and the amplitude is determined by the touch information TOUCH. Each instantaneous value of the excitation waveform is the sampling clock φs
In synchronization with the excitation waveform generation unit 111 and the multiplier 113 sequentially.
sent to a. At the same time, the noise generation unit 112 receives the key-on signal KON, and thereby the noise information NC
A noise waveform corresponding to ONT1 is selected and output. Here, the amplitude of the noise waveform output by the noise generator 112 is determined by the touch information TOUCH. Each instantaneous value of the noise waveform is synchronized with the sampling clock φs and sequentially sent from the noise generator 112 to the multiplier 113b. The output waveform of the excitation waveform generator 111 is multiplied by the excitation waveform weighting coefficient MIXW1 by the multiplier 113a, and the output waveform of the noise generator 112 is multiplied by the noise weighting coefficient MIXN1 by the multiplier 113b. Multiplier 1
The respective waveforms output from 13a and 13b are added by the adder 114 and output to the adder 119 as an initial waveform signal. Similarly in the tone forming system 2, the initial waveform signal is generated and the generated initial waveform signal is input to the loop circuit 200.

In the loop circuit 100, the output waveform of the adder 119 is output to the delay circuit 115. Then, in the delay circuit 115, the input waveform has an integer part D1i of the stage number data D1 in the period τ of the sampling clock φs.
It is delayed by the delay time multiplied by nt. The output waveform of the delay circuit 115 is output by the interpolator 116 to the fractional part D of the stage number data D1 at the period τ of the sampling clock φs.
It is delayed by the delay time multiplied by 1 frac. The waveform delayed by the interpolation unit 116 is filtered by the filter unit 117.
And the high frequency components are removed. The output waveform of the filter unit 117 is output by the multiplier 118 to the attenuation coefficient F.
G1 is multiplied and returned to the adder 119. Then, the output from the multiplier 118 and the output from the adder 114 are added by the adder 119 and output to the delay circuit 115 again to circulate in the loop circuit 100 described above. After that, as the circulation is repeated, the initial waveform decays exponentially. As described above, the waveform loop circuit 1
Resonance occurs due to the circulation in 00, and the loop circuit 10
A waveform propagating in 0 is output as a musical tone signal from an arbitrary place in the loop circuit 100 (for example, before the delay circuit 115 as shown in FIG. 1). The operation in the tone forming system 1 has been described above, but the same operation is performed in the tone forming system 2.

<Interaction Between Loop Circuits 100 and 200> Here, the data circulating in the loop circuit 100 is supplied to the multiplier 120 every time it passes through the filter unit 117, and is multiplied by the modulation envelope signal MODENV1. , And is supplied to the adder 221 as the modulation signal MOD2. Then, the modulated signal MOD2 is added to the delay data DP2 by the adder 221, and the integer part D2int is output to the delay circuit 215 as the stage number data D2, and the decimal part D2frac is output to the interpolating part 216. The delay circuit 215 and the interpolation unit 21 are processed by the stage number data D2.
A delay time of 6 is determined. Therefore, every time the data passes through the filter unit 117, the delay circuit 215 and the interpolation unit 2
The delay time of 16 changes. That is, the loop circuit 10
Frequency modulation is performed with the change of data at 0,
The frequency of the tone signal generated by the loop circuit 200 will change. Further, the data passing through the filter unit 217 also goes through the same path, and its integer part D1int is sent to the delay circuit 115 as the stage number data D1 and its decimal part D1f.
rac is output to the interpolation unit 116. Then, the delay of the delay circuit 115 and the interpolation unit 116 is controlled by the stage number data D1. That is, frequency modulation is performed in accordance with a change in data in the loop circuit 200, and the tone signal generated by the loop circuit 100 changes. Since the loop circuits 100 and 200 respectively synthesize musical tones in the audible band, this frequency modulation has a function of changing the tone color similarly to FM musical tone synthesis. This tone-modulated signal modulates other loop circuits with each other, and cyclical interaction produces complex overtones.

As described above, according to this embodiment, it is possible to control so as to increase the overtone structure.
For example, if the frequency modulation is set to be deeply applied at the rising portion of a musical sound, a musical sound with a more attack feeling is generated.

[0023]

As described above, according to the present invention, the exciting means for outputting the exciting signal based on the input signal and the feedback signal, and the delay means for delaying the exciting signal and outputting the delayed signal. And at least two closed loops each having a delay time of the delay means are controlled by a signal generated by a delay process in another closed loop,
Since the control is mutually performed between the plurality of closed loops, there is an effect that it is possible to synthesize a musical sound including a complicated spectrum and having a rich sound quality by the delay loop.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a sound source device of an electronic musical instrument according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration example of an interpolation unit in the embodiment.

FIG. 3 is a block diagram showing a control information generating means in the embodiment.

[Explanation of symbols]

111, 211 ... Excitation waveform generator, 112, 212 ...
... Noise generator, 115,215 ... Delay circuit, 11
6,216 ... Interpolator 117,217 ... Filter

Claims (1)

[Claims] 1. At least two closed loops each having: an excitation means for outputting an excitation signal based on an input signal and a feedback signal; and a delay means for delaying and outputting the excitation signal. A sound source device for an electronic musical instrument, wherein the delay time of the delay means is controlled by a signal generated by a delay process in another closed loop, and the control is mutually performed among the plurality of closed loops.