JPH0477793A - Noise sound supply unit for electronic instrument - Google Patents

Abstract

PURPOSE:To control the shape of a noise signal with the passage of time and to obtain the noise signal extremely approximate to a noise component included in a natural instrument or the like by controlling the shape of the noise signal at random according to a parameter signal, which is changed with the passage of time, stored in a parameter storing means. CONSTITUTION:The random noise signal composed of a digital signal generated by a random noise generator 1 is sent to a band pass filter 2 as a source sound for noise preparation. The band pass filter 2 can variably control the filter characteristic, namely, a central frequency of a passing band and passing band width B, and the noise signal passing through this filter is inputted to a multiplier 3. The multiplier 3 controls the envelop of the noise signal by multiplying a noise envelop characteristic data, which is sent from a noise envelope characteristic memory 6, to the noise signal sent from the band pass filter 2. Since extremely real and natural music is applied by applying this noise signal to a normal music signal, extremely real and natural music can be generated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a noise sound source device for generating more realistic and expressive musical tones in an electronic musical instrument.

[Conventional technology]

In electronic musical instruments, a target musical tone is generated by generating a sound source signal with a pitch corresponding to the pressed key, and performing necessary processing such as filtering and envelope control on this sound source signal.

By the way, the sound of musical instruments includes not only pure musical sounds but also so-called non-musical noise components such as recorded sounds, plucked sounds, air sounds, and unanalyzable sounds, and these noise components affect the timbre of the instrument and It has a great influence on the texture of the sound. Therefore, in order to generate realistic and expressive musical sounds that are closer to static sounds using electronic musical instruments, it is necessary to add this noise component to the musical sounds.

Conventionally, noise sound source devices for generating such noise components have been ones that store noise waveforms extracted from performance sounds in a memory and read out the noise waveforms in response to musical sound generation operations, or There are known methods that use white noise consisting of an analog signal and add it by adjusting the signal level.

[Problem to be solved by the invention]

However, in the case of a noise sound source device that directly stores the noise waveform, the same preset noise is always added, and in the case of a noise sound source device that uses white noise, the timbre is different for any musical tone. Since uncharacteristic white noise is added to the sound, there is a problem in that the musical tones generated in either case are monotonous and lack a natural feel.

The present invention has been made based on the above circumstances, and its object is to provide a noise sound source device that can generate more realistic and expressive musical tones.

[Means for Solving the Problem] In order to achieve the above object, the first noise sound source device stores a noise signal generating means for generating a random noise signal and a parameter signal that changes over time, and generates musical tones. a parameter storage means from which the parameter signal is read out in response to a generation instruction; and noise for controlling the shape of the noise signal generated by the noise signal generation means based on the parameter signal read from the parameter storage means. The invention is characterized by comprising a control means.

Further, the second noise sound source device includes a noise signal generating means for generating a random noise signal, a parameter generating means for generating a parameter signal for controlling a peak characteristic in a spectrum of the noise signal, and a noise signal generating means for generating a parameter signal for controlling a peak characteristic in a spectrum of the noise signal. and noise peak control means for inputting a noise signal generated from the means and controlling the peak characteristic in the spectrum of the noise signal based on the parameter signal generated from the parameter generation means. .

[Function] In the case of the first noise sound source device, when an instruction to generate a musical tone is given, parameter signals for controlling the shape of the noise signal are successively read out from the parameter storage means. The noise shape control means changes the shape of the noise signal according to the time-varying parameter signal output from the parameter storage means. The noise shape control means can be configured by, for example, a digital filter, and by controlling the peak frequency characteristics and bandwidth characteristics of this digital filter based on a parameter signal, the frequency component of the noise signal input to the digital filter, that is, The shape of the noise signal can be controlled over time. In this case, the parameter signal that controls the shape of the noise signal is stored in advance in the parameter storage means, but the parameter signal may be stored in response to the complex characteristics of the noise component contained in the target natural instrument sound, etc. As a result, it is possible to obtain a noise signal that has randomness but is controlled to a desired state.

Therefore, by adding this noise signal to a normal musical tone signal, a very realistic and natural musical tone can be generated.

Further, in the case of the second noise sound source device, the noise peak control means controls the peak characteristic of the spectrum included in the noise signal generated by the noise signal generation means in accordance with the parameter signal from the parameter generation means. This noise peak control means can be configured, for example, by a digital filter, and by controlling the peak frequency characteristics and bandwidth characteristics of this digital filter based on a parameter signal, it is possible to control the noise contained in the noise signal input to the digital filter. It is possible to control the peak characteristics of the frequency components. As a result, a noise signal having randomness but having a spectrum that is formant-controlled to a desired state similar to that of noise components contained in natural musical instruments or the like can be obtained. Therefore, by adding this noise signal to a normal musical tone signal, a very realistic and natural musical tone can be generated.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a first embodiment of the noise source device of the present invention. A random noise signal consisting of a digital signal generated by a random noise generator 1 is sent to a bandpass filter 2 as an original sound for creating noise. The bandpass filter 2 is a digital filter whose filter characteristics, that is, the center frequency 10 of the passband and the width B of the passband, can be variably controlled.The noise signal that has passed through this filter is input to the multiplier 3. . The multiplier 3 controls the envelope of the noise signal by multiplying the noise signal sent from the bandpass filter 2 by the noise envelope characteristic data sent from the noise envelope characteristic memory 6.

The noise frequency characteristic memory 4 consists of a semiconductor memory such as ROM or RAM, and samples the performance sound of the musical instrument for each key depending on the strength of the key touch, and records the temporal change curve of the peak frequency f0 of the noise component for each key. Each key touch is stored as a noise frequency characteristic table FF(t). An example of this noise frequency characteristic table FF(t) is shown in FIG. This figure 2 shows a noise frequency characteristic table for each key touch when the strength of the initial key touch is changed to n levels for one key, and such a characteristic table is stored in the noise frequency characteristic memory 4. is stored for each key.

The noise bandwidth characteristic memory 5 is composed of a semiconductor memory such as ROM or RAM, and samples the performance sound of a musical instrument for each key at each key touch strength, and records a temporal change curve of the bandwidth of the noise component, for example, the peak frequency. r0
Find the temporal change curve of the bandwidth B at the point where the amplitude decreases by 3 dB (1#T) for each key touch of each key, convert the second bandwidth B into the selectivity Q of the filter, and calculate the noise. It is stored as a bandwidth characteristic table FQ(t).

The third example of this noise bandwidth characteristic table FQ(t) is
As shown in the figure. FIG. 3 shows a noise bandwidth characteristic table for each key touch when the strength of the initial key touch for one key is changed to n levels. A characteristics table is stored for each key.

Note that the relationship between the peak frequency f0 of the noise component described above, its bandwidth B, and the selectivity Q of the filter is Q=fO
/B, and can be easily converted from B to Q.

The noise envelope characteristic memory 6 is a ROM or RA.
It consists of a semiconductor memory such as M, and samples the performance sound of the musical instrument for each key depending on the strength of the key touch, and creates a noise envelope characteristic table NE ( t). This noise envelope characteristic table N
An example of E (t) is shown in FIG. This figure 4 shows 1
This shows a noise envelope characteristic table for each key touch when the strength of the initial key touch is changed in n steps for one key, and such a characteristic table is stored for each key in the noise envelope characteristic memory 6. There is.

The reading circuits 7, 8.9 input musical tone generation instruction information, that is, a key-on signal, a key code indicating the pressed key (that is, the pitch of the musical tone to be generated), and key touch data as input information for each of the memories. From 4 and 5.6, select the characteristic table corresponding to the key pressed at that time (key code) and the key touch strength (key touch data), and set the data of each characteristic table to a predetermined value in response to the key-on signal. This is a circuit that sequentially reads data in synchronization with the clock. Noise frequency characteristic table FF(t) and noise bandwidth characteristic table FQ(t) read from noise frequency characteristic memory 4 and noise bandwidth characteristic memory 5
) data is sent to band pass filter 2, and
The data of the noise envelope characteristic table N E (t) read from the noise envelope characteristic memory 6 is sent to the multiplier 3 .

The bandpass filter 2 maintains its filter characteristics according to the data of the noise frequency characteristic table FF(t) and the noise bandwidth characteristic table FQ(t) sent from the noise frequency characteristic memory 4 and the noise bandwidth characteristic memory 5, i.e. The center frequency f0 of the passband and its passband width B (selectivity Q of the filter) are variably controlled. Therefore, the random noise signal input to the bandpass filter 2 has a peak frequency f0 of its noise component that follows a change curve as illustrated in FIG. 2, and a bandwidth B of the noise component as illustrated in FIG. 3. The signals are processed into noise signals that change over time according to change curves such as
sent to.

On the other hand, the data of the noise envelope characteristic table NE(1) read from the noise envelope characteristic memory 6 is sent to the multiplier 3 as described above. Multiplier 3 is
The data of this noise envelope characteristic table NE(t) is multiplied by the noise signal sent from the bandpass filter 2, and the envelope is variably controlled. Therefore, the noise signal input to the multiplier 3 becomes a noise signal whose envelope changes over time according to a change curve as illustrated in FIG.

As a result, the noise signal output from the multiplier 3 has the peak frequency f of the noise component in the noise signal.

, its bandwidth B, and its envelope become a noise signal that adaptively changes over time depending on the key pressed at that time and the difference in key touch at that time, and is extremely sensitive to the noise contained in the actual sound of a musical instrument. The result is a very similar noise signal.

FIG. 5 shows a noise frequency characteristic table FF(t) and a noise bandwidth characteristic table FQ(t) stored in the memories 4, 5.6.
) and noise envelope characteristics − r − pull NE(t)
An example of the configuration of a measurement circuit is shown below. In the example shown in FIG. 5, a piano 10 is used as an acoustic instrument for sampling, and a solenoid IT for keystroke and a driver 12 for driving the solenoid are installed in each key of the piano 10, and the driver 12 is controlled by a microcomputer 13. It is configured so that each key can be pressed freely by controlling the key touch strength to be freely changed. Then, the 1° sound produced by the piano at the time of this keystroke is picked up by the microphone 14 and the amplifier 5, converted into digital data by the A/D converter 16, and stored in the internal RAM of the microcomputer 13. By analyzing using Fast Fourier Transform (CFFT) etc., the noise frequency characteristic table FF(t), the noise bandwidth characteristic table FQ(1), and the noise envelope characteristic table NE are generated for each key touch of each key.
(t).

That is, the operation of the measuring circuit shown in FIG. 5 will be explained with reference to the flowchart shown in FIG. ), after setting the key touch strength TD to TD=O, which specifies the weakest tone (step 52), the driver 12 is controlled to press the key with key code KCD=O, that is, the key with the lowest tone, with the weakest key touch. do. A microphone 14 and an amplifier 15 pick up the raw sound of the piano 10 resulting from this keystroke, and the A/D converter 16 converts it into a digital signal and stores it in the internal RAM of the microcomputer 13. Then, using this stored sampling data, the noise frequency characteristic table FF at the key touch intensity at that time is
(t), a noise bandwidth characteristic table FQ(t), and a noise envelope characteristic table NE(t).

The above process is repeated for each key while changing its key touch strength TD in 8 levels (TD=O~7) (steps S4 and S5), and then this process is repeated for all keys from the lowest note to the highest note. Execute sequentially for keys (step S
6, S7).

As a result, a noise frequency characteristic table FF(t) and a noise bandwidth characteristic table F are obtained for each of the eight levels of key touch strength for each key, from the lowest note to the highest note.
Q(t) and noise enherobe characteristic table NE(
t) is obtained, the microcomputer 13 stores this obtained characteristic table in the noise frequency characteristic memory 4.
, into the noise bandwidth characteristic memory 5 and the noise envelope characteristic memory 6, respectively.

FIG. 7 is a flowchart showing details of the noise parameter measurement routine (step S3) in FIG. 6. This figure 6 shows that for each key touch, the key is pressed N times.
Each characteristic table is obtained as the average of these N keystrokes, and the number of keystrokes i is monitored in steps SL1, 518, and 519.

First, the solenoid 11 is driven to cause the piano IO to generate a sound corresponding to the key code KCD and the key touch intensity TD, and the sound is sampled (step 512). Then, the noise component is extracted using the sampled waveform of the sustain section from the past (step 513). Then, the envelope e (t) of this noise component is extracted and normalized (step 514).

The obtained envelope e (t) is
(t) to obtain a noise envelope characteristic table NE(t) based on the average of N times (step knob 515).

On the other hand, the normalized noise component is subjected to fast Fourier transform (FFT) every fixed interval Δ, and its frequency characteristic r (t
, ν) (Ste knob 516), and add the obtained frequency characteristic f (t, ν) to the frequency characteristic F (t, ν) obtained up to the previous time. Obtain the characteristic F (t, ν) (step 517).

When N times of keystrokes are completed for one keystroke strength (step 818), the frequency characteristics F (t, ν) for N times obtained in step S17 are analyzed to determine the keystroke strength at that time. Noise frequency characteristic table FF(t) and noise bandwidth characteristic table F
Each of Q(t) is determined (step 520). Then, the obtained noise frequency characteristic table FF(t) is written in the noise frequency characteristic memory 4, the noise bandwidth characteristic table FQ(t) is written in the noise bandwidth characteristic memory 5,
Further, the noise envelope characteristic table NE(t) obtained in step 315 is written into the noise envelope characteristic memory 6 (step 521). Furthermore, if necessary, settings such as a repeating loop of the noise component for the sustain part of the noise signal are performed (step 52
2).

FIG. 8 shows an example of a musical tone generation device constructed using the noise tone generator of the first embodiment (FIG. 1). In the figure, the block indicated by the reference numeral 23 is the noise sound source device of FIG. Further, in this example, a musical tone signal is generated by a well-known PCM sound source device 22. Note that the normal noise sound source device 23 and the PCM sound source device 22 have a multi-channel configuration, and are configured to be able to simultaneously generate musical tone signals and their noise signals for a plurality of keys in a time-sharing manner.

Further, the noise sound source device W23 is basically the same as that shown in FIG.
．． 6 is a table F(t), F for each tone, each key (each pitch), and each key touch.
It stores Q(t) and NE(t).

When the timbre switch 20 is operated to select a predetermined instrument, such as a piano, a timbre designation signal specifying a piano sound is sent from the timbre switch detection circuit 21 to the PCM sound source device 22 and the noise sound source device 23, and the sound is generated within each sound source. The circuits necessary to generate piano sounds are selected.

When the keyboard 17 is pressed, the key-on signal shown in FIG. 9(C) is sent from the key press detection circuit 17 to the channel assignment circuit 19.
Necessary key press information such as a key code indicating the pitch and a key touch code indicating the strength of the key touch is sent. The channel assignment circuit 19 determines which key tones are to be sounded on which channel according to this key press information, and sends channel designation codes, key-on signals, key codes, and key touch codes to the PCM sound source device 22 and the noise sound source device 23. send.

Based on the data sent from the channel assignment circuit 19 and the tone switch detection circuit 21, the PCM sound source device 222 corresponds to the key pitch and tone of the key code at that time, and also corresponds to the key-on length and key touch at that time. A musical tone signal having a predetermined envelope as shown in FIG. 9(a) corresponding to the intensity is generated and output.

On the other hand, the noise sound source device 23, as explained in FIG. , and has noise frequency characteristics, noise bandwidth characteristics, and noise envelope characteristics corresponding to the key touch intensity at that time.
A predetermined noise signal as shown in Figure (b) is generated and output.

The musical tone signal and noise signal of each channel generated in a time-sharing manner by the PCM sound source device 22 and the noise sound source device 23 are added in an adder 24, and then added to a channel accumulator 25.
The musical sound signals of each channel are superimposed at the D/A
It is sent to the sound system via converter 26.

In addition, as shown in FIG. 9(a), the sustain part S of the musical tone
If the duration of the noise signal is long, the sustain portion of the noise signal may repeat the same noise pattern in a loop as shown in FIG.

FIG. 10 shows a second embodiment of the noise source device of the present invention. This second embodiment has four noise signal generation circuits.
The system is arranged in parallel, and the noise signals output from each noise signal generation circuit are added by an adder 29 and output as a final noise signal. With this configuration, the peak frequency f is set for each system, as shown in FIG. 11, the noise characteristics of which are shown. , ~foa can be generated independently, and by combining them, a noise signal closer to actual noise can be generated. In addition, in FIG. 10, 2a to 2d are band pass filters, and 38 to 3d are multipliers. Also,
The parameter generators 28a to 28d each include characteristic memories 4 to 6 and a readout circuit 7 shown in FIG.
~9 are built-in, and each parameter generator generates a unique noise frequency characteristic table F F (
t) 1 to F F (t) 4, noise bandwidth characteristic table FQ (t) 1 to F Q (t) 4, and noise envelope characteristic table N E (t) 1- N E
(t) Bandpass filter 2 corresponding to the data of 4
The signals are sent to a to 2d and multipliers 3a to 3d.

FIG. 12 shows a third embodiment of the noise source device of the present invention. This third embodiment is constructed as a noise sound source device that is passed through a musical sound generation device using an FM sound source. In the figure, the part indicated by the reference numeral 30 constitutes the noise sound source device of the present invention described above, and the random noise generator 1
, low-pass filter 2e, multiplier 3, characteristic memories 4 to 6
, and a readout circuit 7a. In addition to the configuration of the noise sound source device 30 of the present invention, an envelope generator 31 and a multiplier 32 are further added to make the noise sound source device suitable for an FM sound source. The noise signal output from the multiplier 3 is sent to the FM sound source device of FIG. 13, which will be described later.
The noise signal sent as one of the modulation data for modulation and branched from the low-pass filter 2e is sent to the multiplier 3.
2, the envelope is modulated by the envelope signal output from the envelope generator 31, and then sent to the adder 24 in FIG.

FIG. 13 shows an example of a musical tone generation device constructed using the noise sound source device shown in FIG. 12. The musical tone generating apparatus shown in FIG. 13 employs the FM sound source device 34 as a sound source for musical tone signals, as described above. Note that circuits that are the same as those in FIG. 8 are given the same reference numerals and their explanations will be omitted.

As is well known, the FM sound source device 34 uses a module called an operator, and is configured so that the operator modulates phase data (sin table address signal) for generating a sine wave, which becomes a carrier wave, with a modulation signal. By varying the number of operators connected, the connection method, and the feedpack method, a desired musical tone signal can be generated. The noise signal output from the multiplier 3 in FIG. 12 is input to this FM sound source device 34 as one of the modulation data for FM modulation. Further, the noise signal output from the multiplier 32 in FIG. 12 is sent to the adder 24, and added as a noise signal to the musical tone signal generated by the FM tone generator 34.

In general, the frequency spectrum of an FM sound source is shown in Figure 14 (
As shown in a), the fundamental tone and its harmonic components account for most of the sound, and non-harmonic components are extremely small. In a musical tone signal having a spectrum as shown in FIG. 14(a), the sound is too monotonous. Therefore, it is necessary to generate a musical tone signal having a bulge of non-harmonic components around the fundamental wave and overtone components, as shown by hunting in FIG. 14(b). Therefore, in order to generate a musical tone signal having a spectrum as shown in FIG. 14(1)), the hatched frequencies in FIG. 14(b) are stored in each characteristic memory 4 to 6 in FIG. It is desirable to store each characteristic table that gives the components.

A characteristic table F suitable for adding a frequency component as shown by the hatching in FIG. 14 (I)) to FIG. 15.
An example of a method for measuring noise parameters to obtain F (t), F Q (t), and N E (t) will be shown. The flowchart shown in Fig. 15 uses the measurement circuit shown in Fig. 10 as the measurement circuit, and each key is pressed only once for each key touch, and from the sampling data obtained at this time, a noise characteristic table for each key touch is created. This is what you get.

That is, to briefly explain the flowchart in FIG. 15, first, the solenoid 11 is driven to cause the piano to produce a sound corresponding to the key code KCD and the key touch intensity TD.
The sound is sampled (step 530). After removing the envelope from this sampled waveform to obtain a normalized waveform with a constant amplitude (step 531
), fast Fourier transform (FFT) is applied to this waveform every fixed interval to obtain its frequency characteristics (step S
32,533).

From the frequency characteristics obtained as above, Figure 16 (
As shown in a), the frequency component of the fundamental wave portion is extracted in a form that preserves the bottom part of the frequency component (step 534),
The frequency axis is converted so that the center position of this frequency component is at the OHz position, and the frequency components on the left and right sides of the center position are added to create the frequency characteristic of only one side suitable for a low-pass filter as shown in Figure 16 (C). (Step 53
5). Then, the cutoff frequency, selectivity Q, and attenuation level values of the low-pass filter 2e that simulate the frequency characteristics shown in FIG. t) and NE(
1) is obtained (step 536).

By sequentially performing the above processing for each section up to the last section (steps 337, 338), a noise frequency characteristic table F F (t ),
A noise bandwidth characteristic table FQ (t) and a noise envelope characteristic table NE(1) are obtained. By performing such processing for each key touch strength for each manufacturer of various musical instruments, characteristic tables FF(t), FQ(t), and N E (t) for each key touch strength for each musical instrument and each company are created. are obtained respectively. Therefore, each of the obtained characteristic tables may be written into each of the characteristic memories 4 to 6 in FIG. 13.

If the noise signal generated by the noise sound source device 33 containing each characteristic table obtained as described above is given to the FM sound source device 34 as one of the modulation data for FM modulation, the FM sound source device 34 will be A musical sound signal rich in naturalness is generated, as shown in FIG. 14(b), including a fundamental wave and its overtones, and non-overtone components with a certain spread around them.

In each of the above embodiments, tables FF(t) and F are created for each company (each pitch) for each characteristic memory 4 to 6.
Although Q(t) and N E (t) are stored, these tables may be stored for each key range (each tone range) instead of for each key.

〔Effect of the invention〕

As is clear from the above description, the noise sound source device according to claim (1) controls the shape of the random noise signal according to the temporally changing parameter signal stored in the parameter storage means. Therefore, the shape of the noise signal can be controlled over time and in a complex manner, and a noise signal that is extremely close to the noise component contained in a natural musical instrument or the like can be obtained. therefore,
By adding the noise signal obtained in this way to a musical tone signal, it becomes possible to generate a musical tone that is more realistic and expressive than ever before.

Further, in the noise sound source device according to claim (2), since the peak characteristic of the spectrum of the random noise signal is controlled according to the parameter signal,
The characteristics of a random noise signal can be easily controlled to a desired state, and a noise signal having a spectrum extremely similar to a noise component included in a natural musical instrument or the like can be easily obtained. Therefore, by adding the noise signal obtained in this way to a musical tone signal, it becomes possible to generate a musical tone that is more realistic and expressive than ever before.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a first embodiment of the noise sound source device of the present invention, FIG. 2 is a diagram showing an example of a noise frequency characteristic table for the present invention, and FIG. 3 is a noise band for the present invention. FIG. 4 is a diagram showing an example of a noise envelope characteristic table for the present invention; FIG. 5 is a configuration diagram of a noise parameter measurement circuit in the first embodiment; FIG. 6 is a diagram showing an example of a width characteristic table; is a flowchart of the processing operation of the measurement circuit, FIG. 7 is a detailed flowchart of the noise parameter measurement routine in FIG. 6, and FIG. A block diagram showing an example; FIG. 9 is a diagram showing an example of the waveforms of a musical tone signal and a noise signal generated in the musical tone generating device of FIG. 8; FIG. Block diagram; FIG. 11 is an explanatory diagram of the noise signal generated in the second embodiment; FIG. 12 is a block diagram of the third embodiment of the noise sound source device of the present invention; FIG. 13 is the third embodiment A block diagram showing an example of a musical tone generating device configured using the example noise sound source device, FIG. 14 is a diagram showing the frequency characteristics of a musical tone signal generated by an FM sound source, and FIG. 15 is a musical tone using an FM sound source. 16 is a flowchart of a noise parameter measurement method for the generation device, and FIG. 15 is a diagram showing the frequency characteristics of the fundamental wave component. 1... Random noise generator, 2, 2a to 2d...
Band pass filter, 2e...Low pass filter, 3
．． 3a to 3e... Multiplier, 4... Noise frequency characteristic memory, 5... Noise bandwidth characteristic memory, 6... Noise envelope characteristic memory, F F (t)... Noise frequency characteristic table, FQ(t)...Noise bandwidth characteristic table, N E (t)...Noise envelope characteristic table. Figure 2 Example of FF(t) table Figure 3 Example of FQ(t) table Figure 4 Example of NE(t) table Flowchart of measurement operation Figure 6 Figure 9 Waveform example of musical tone signal and noise signal (a ) Frequency characteristics of the FM sound source Figure 14 Flowchart of the noise parameter measurement method for the third embodiment Figure 15 Frequency characteristics of the fundamental wave component Figure 16 Procedure main car official book Heisei (self-published) August 2015 On the 24th, Mr. Satoshi Ueoh, Commissioner of the Japan Patent Office1, 1H Ushi no Jishiyun 1990 Patent Application No. 1903902, Name of the invention Noise sound source device for electronic musical instruments 3゜ Relationship with the case of the person making the amendment Patent applicant Address: 10-1 Nakazawa-cho, Hamamatsu City, Shizuoka Prefecture Name (407) Yama71 Co., Ltd. 4, Agent 5 Date of amendment order: Month, 1989
Day 6: Number of inventions increased by amendment Details of the amendment (Japanese Patent Application No. 190390/1999) 1. The scope of claims in the specification is amended as follows. (1) Noise signal generation means for generating a random noise signal; parameter storage means for storing time-varying parameter signals; parameter storage means for reading out the parameter signals in response to instructions for musical tone generation; and the parameter storage. A noise sound source device for an electronic musical instrument, comprising: A size shape control means for controlling the shape of a noise signal generated across the noise signal generation circuit based on a parameter signal read from the means. (2) Noise signal generating means for generating a random noise signal; parameter generating means for generating a parameter signal for controlling peak characteristics in the spectrum of the noise signal; and a noise signal generated by the noise signal generating means. and noise peak control means for controlling peak characteristics in the spectrum of the noise signal based on the parameter signal generated from the parameter generation means. 2. "Means et al. J" on page 4, line 12 of the specification is amended to read "means et al." 3. "Noise control means j [
"Noise shape control means".

Claims (2)

[Claims] (1) Noise signal generation means that generates a random noise signal; Parameter storage means that stores time-varying parameter signals and reads out the parameter signals in response to an instruction to generate musical sounds; and the parameter storage means. 1. A noise sound source device for an electronic musical instrument, comprising: noise control means for controlling the shape of a noise signal generated by the noise signal generation means based on a parameter signal read from the noise signal generation means. (2) Noise signal generating means for generating a random noise signal; parameter generating means for generating a parameter signal for controlling peak characteristics in a spectrum of the noise signal; and a noise signal generated by the noise signal generating means. and noise peak control means for controlling peak characteristics in the spectrum of the noise signal based on a parameter signal generated from the parameter generation means.