JPH10254446A - Sound source device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable changing the tone of musical sound produced in accordance with the intensity of a touch and a range. SOLUTION: A fine variation component of a musical sound is stored in a fine variation generating part 11. In an envelope synthesizing part 15, the variation part is added to the envelope generated in an envelope generating part 12. The ratio of a variation part to be added, in short, the amplitude of the variation part is decided by tone changing parameters of a touch velocity or the like. In a waveform memory 17, musical sound waveforms are stored and in an envelope imparting part 16, the envelope added with the variation part is imparted on a musical sound waveform and the musical sound is supplied to a sound system.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a sound source device,
In particular, the present invention relates to a sound source device suitable for tone control in a sound source of an electronic musical instrument, a sound source board, a communication karaoke, an electronic game machine, and the like.

[0002]

2. Description of the Related Art In a tone generator, there are known various methods of changing a tone by changing a tone waveform in order to avoid a monotonous tone generated. For example, in an electronic musical instrument described in Japanese Patent Application Laid-Open No. 53-88715, waveform data stored in a waveform memory and the waveform data changed through a filter and a delay circuit are mixed and added to form an output waveform.

In an electronic musical instrument disclosed in Japanese Patent Application Laid-Open No. 61-36995, a new musical tone waveform is generated by synthesizing two types of waveforms stored in advance in a waveform memory at a ratio corresponding to a tone color change parameter. Like that. The tone color change parameters correspond to touch, pitch, tone range, pedal operation, and the like.

Further, in the electronic musical instrument described in Japanese Patent Application Laid-Open No. 59-109090, a first memory storing a musical tone waveform of an attack portion and a second memory storing a musical tone waveform of a stable portion are provided. Having. Then, the tone waveform of the attack portion is read out from the first memory, and subsequently, the tone waveform of the stable portion is read out from the second memory to generate sound. The first memory stores a plurality of tone waveforms of attack portions having different characteristics from each other, so that an attack portion having different characteristics can be selected according to a touch.

[0005]

The electronic musical instrument employing the above-mentioned tone changing method has the following problems. First,
In the method of changing the frequency characteristics of a sound using a filter, a part of the waveform read from the waveform memory is cut, so that, for example, a change in timbre due to a touch in a piano sound cannot be sufficiently reproduced. There is.

In the timbre changing method for changing the mixture ratio of two sounds, an unnatural sound may occur because the phases do not match when the mixture ratio is around 1: 1. That is, there is a problem in that the obtained waveforms are disturbed in the opposite phases, such as mutual cancellation of the sounds. Furthermore, a method of storing a plurality of sounds separately and switching between them according to a touch is not practical because a large-capacity waveform memory is required.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems and to provide a tone generator capable of generating an accurate musical tone in accordance with a touch or a tone range without increasing the capacity of a waveform memory. .

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems and achieve the object, the present invention provides a fine fluctuation generating means for generating a fine fluctuation component of an amplitude in a musical tone, and an envelope for generating an envelope of the musical tone. Generating means, a ratio of a fine fluctuation portion added to the envelope, a ratio setting means for setting the ratio according to a timbre change parameter, and the fine fluctuation component whose amplitude is changed according to the ratio set by the ratio setting means. Envelope synthesis means for adding to the envelope, waveform storage means for storing the musical sound waveform,
A first feature is that the musical sound waveform read out from the waveform storage means is provided with an envelope providing means for providing an envelope to which the fine fluctuation component is added.

Further, the present invention provides a fine fluctuation generating means for generating a fine fluctuation component of the amplitude of each overtone of a musical tone, an envelope generating means for generating an envelope for each harmonic of the musical tone, and a fine addition to the envelope. A ratio setting means for setting the ratio of the variable portion according to the tone color change parameter; and an envelope synthesis for adding the fine fluctuation component whose amplitude is changed according to the ratio set by the ratio setting device to the envelope for each harmonic. Means, a waveform storage means for storing each overtone of the musical tone waveform, an envelope giving means for giving an envelope obtained by adding the fine fluctuation component to the tone waveform for each harmonic read out from the waveform storage means, and the envelope And harmonic synthesis means for synthesizing a musical tone waveform for each harmonic with
There is a feature.

Further, the present invention is characterized in that the timbre change parameter is a touch velocity, and the ratio setting means is configured to set the ratio of a fine fluctuation portion added to an envelope to be larger as the touch velocity increases. There is a third feature.

According to the first to third features, it is possible to change the amplitude of the finely varying portion of the musical tone in accordance with the tone color change parameter. In particular, according to the second feature, the finely varying portion can be changed for each harmonic, and the changed finely varying portion is added to the envelope for each harmonic. Further, according to the third feature, the minutely fluctuating portion can be changed according to the touch intensity.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings. FIG. 2 is a block diagram showing a configuration of an electronic musical instrument including a sound source device according to one embodiment of the present invention. In FIG. 1, the keyboard device 1 has a plurality of keys 1a and sensors 1b provided corresponding to the respective keys 1a to detect a pressed state and a released state of the plurality of keys 1a. The sensor 1 b is connected to the bus 2, and key codes and touch information detected by the sensor 1 b are transmitted to the CPU 2 via the bus 2.
3 is input. The CPU 3 includes an operation panel 4 having various switches such as a power switch, a tone selection switch, and a volume switch, and a pedal 5 for providing a damper effect and a soft effect via an I / O interface (not shown). It is connected. Further, an external device can be connected to the CPU 3 via the MIDI interface 6. The ROM 7 has a program memory for storing programs to be executed by the CPU 3, a timbre data memory (waveform memory) for storing timbre data, and an area for storing fine fluctuation component data and tables described later. The RAM 8 is provided for storing change data such as registers and flags.

The CPU 3 receives signals from the keyboard 1, the operation panel 4 and the pedal 5 to read data from the ROM 7 or R
Processing is performed using the programs and data stored in the AM 8, and an instruction based on the processing result is supplied to the musical sound generation unit 9. The tone generator 9 synthesizes a tone signal based on an instruction from the CPU 3 and supplies the synthesized tone signal to the sound system 10. The sound system 10 generates a tone based on the tone signal. The tone generator 9 includes a digital control oscillator (DCO) 9a for generating a pulse for reading a waveform signal from a waveform memory in the ROM 7, and a digital control amplifier (DCA) 9b for adjusting the amplitude of the read waveform signal. And a digital control filter (DC
F) 9c can be provided.

Next, an outline of the present embodiment will be described. FIG.
FIG. 3 is a waveform diagram of an attenuated sound represented by a piano sound. The amplitude component of the musical tone waveform of the piano shown in FIG. 2A has an envelope (FIG. 2B) and a fine fluctuation component (FIG. 2C). According to observations made by the inventor, the fine fluctuation component (hereinafter, simply referred to as “variation component”) has a waveform characteristic as shown in FIG. That is, it has a high level in a low frequency range.

Therefore, in the present embodiment, in consideration of the characteristics of the above-mentioned musical tone waveform, a musical tone is generated by synthesizing the envelope and the variable component, and the ratio of the variable component to be added to the envelope is determined by the touch or the sound range. Is changed by the tone color change parameter corresponding to.

FIG. 5 shows an example of the relationship between the ratio of the variation component (variation coefficient k) and the touch velocity. As shown in the figure, the addition ratio is set to increase as the touch velocity increases. According to this ratio, when the touch is strong, the expected fluctuation component is multiplied by the large coefficient k, and the amplitude of the fluctuation component added to the envelope increases. When the touch is weak, the expected fluctuation component is multiplied by a small coefficient k, and the amplitude of the fluctuation component added to the envelope becomes smaller.

Next, the tone generation operation described above will be described in more detail. FIG. 1 is a block diagram illustrating main functions of the sound source device according to the present embodiment. The fine fluctuation generating unit 11 is, for example, a memory storing a fluctuation component, and can be realized by the ROM 7. The fluctuation component is preferably extracted from the raw sound of a piano. The envelope generator 12 can be realized by the CPU 3 and the DCA 9b. That is, D
The CA 9b generates an envelope curve based on envelope parameters supplied from the CPU 3, that is, ADSR.

The ratio setting section 13 can be realized by the ROM 7 storing the table shown in FIG. 5, and has a coefficient k corresponding to the touch velocity based on the signal detected by the sensor 1b.
Occurs. The ratio assigning unit 14 includes a multiplier, and multiplies the fluctuation component input from the fine fluctuation generating unit 11 by the coefficient k and outputs the result. The envelope synthesizer 15 is composed of an adder, and adds a fluctuation component obtained by multiplying the envelope curve output from the envelope generator 12 by a coefficient k. The envelope curve to which the fluctuation component has been added is supplied to the envelope providing unit 16.

The waveform memory 17 which can be realized by the ROM 7 stores a tone waveform in the form of PCM. The tone waveform stored in the waveform memory 17 is a waveform having a constant amplitude, that is, an envelope-normalized waveform. The waveform read out from the waveform memory 17 according to the key code, that is, the pitch, is given an envelope by the envelope assigning section 16 and then sounded through the sound system 10.

As described above, according to the present embodiment, the fluctuation component of the ratio determined according to the touch intensity is added to the envelope, and the musical tone waveform is determined by the envelope. Note that if the parameter for determining the ratio of the fluctuation component affects the change in timbre,
Not only the touch but also the range, the type of the instrument, the modulation, the bend, the pedal operation signal, and the like can be adopted as parameters. These are collectively called timbre change parameters.
The range can be determined from the key code, and the type of musical instrument can be determined from the signal of the musical instrument designation switch provided on the operation panel 4. The modulation is a modulation wheel, and the bend is a signal output by the operation of the vendor as a parameter. The modulation wheel and the vendor are both provided on the operation panel 4.

Next, a modification of this embodiment will be described. In this modified example, as shown in FIG. 6, the overtone synthesizing unit 18 is provided at the next stage of the envelope providing unit 16 as shown in FIG. The fine fluctuation generator 11 is deformed so as to generate a fluctuation component for each harmonic. That is, the fluctuation component for each harmonic order is stored in the fine fluctuation generator 11.

On the other hand, envelope parameters are set in the envelope generator 12 so that an envelope curve can be generated for each harmonic order. Further, the waveform memory 17 stores a tone waveform for each harmonic order. The tone waveform of each harmonic can be extracted by passing the waveform of the raw sound through a bandpass filter for each harmonic.

According to this configuration, the fluctuation component for each harmonic whose ratio is determined in accordance with the tone color change parameter is added to the envelope for each harmonic, and this is added to the envelope assigning section 16.
Generates a waveform added to the waveform for each overtone. Then, the overtone synthesizer 18 synthesizes all overtones to generate a musical tone. According to this modification, it is possible to generate a musical tone with a more varied tone color change according to the change in the tone color change parameter.

In the above-described embodiment, the fine fluctuation generating section 11 is realized by a ROM in which a raw sound is recorded, but the present invention is not limited to this. As shown in FIG. 4, the waveform of the fluctuation component has a high level at a low frequency. Therefore, the fluctuation component having such characteristics can be pseudo-realized by, for example, providing a random number generator that randomly outputs an amplitude signal and extracting an output signal from the random number generator through a low-pass filter. it can.

The ratio setting unit 13 is not limited to a table that outputs the coefficient k in accordance with the timbre change parameter. It may be constituted by a vessel.

[0026]

As apparent from the above description, according to the first to third aspects of the present invention, the fluctuation component of the original sound can be reproduced almost exactly by the fine fluctuation generating means, and the precise fluctuation corresponding to the tone color change parameter can be achieved. A change in timbre can be obtained. In particular, since the fine fluctuation generating means only needs to store at least one fluctuation component corresponding to a musical tone to be generated, it is not necessary to increase the memory capacity.

According to the second aspect of the present invention, the finely varying portion can be changed for each harmonic, and the changed finely varying portion can be added to the envelope for each harmonic, so that a more diverse timbre can be obtained. Can generate musical tones.
If a piano is specifically taken as an example, a tone color change can be given by changing the magnitude of the fine fluctuation component according to the touch.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating main functions of a sound source device according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a hardware configuration of an electronic musical instrument including the sound source device according to the embodiment of the present invention.

FIG. 3 is a diagram illustrating an example of a waveform of a damping sound.

FIG. 4 is a diagram showing characteristics of a waveform of a fine fluctuation component.

FIG. 5 is a diagram illustrating an example of a multiplication coefficient of a fluctuation component corresponding to touch velocity.

FIG. 6 is a block diagram illustrating main functions of a sound source device according to a modification of the embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Keyboard device, 3 ... CPU, 4 ... Operation panel, 9
... tone generator, 10 ... sound system, 11 ... fine fluctuation generator, 12 ... envelope generator, 13 ... ratio setting unit, 15 ... envelope synthesizer, 16 ... envelope assigner, 17 ... waveform memory, 18 ... harmonic synthesis Department

Claims (3)

[Claims] 1. A fine fluctuation generating means for generating a fine fluctuation component of an amplitude in a musical tone; an envelope generating means for generating an envelope of the musical sound; and a ratio of a fine fluctuation portion added to the envelope according to a timbre change parameter. A ratio setting unit that sets the fine fluctuation component whose amplitude is changed according to the ratio set by the ratio setting unit to the envelope; a waveform storage unit that stores a musical sound waveform; and the waveform A sound source device comprising: an envelope providing means for providing an envelope obtained by adding the fine fluctuation component to the musical tone waveform read from the storage means. 2. A fine fluctuation generating means for generating a fine fluctuation component of an amplitude in each harmonic of a musical tone; an envelope generating means for generating an envelope for each harmonic of the musical sound; and a ratio of a fine fluctuation portion added to the envelope. Ratio setting means for setting the fine variation component, the amplitude of which is changed according to the ratio set by the ratio setting means, to the envelope for each harmonic, and a musical tone. Waveform storing means for storing each harmonic of a waveform; envelope providing means for providing an envelope to which the fine fluctuation component is added to a musical sound waveform for each harmonic read out from the waveform storing means; and the envelope is provided. A tone generator comprising: a harmonic synthesizer for synthesizing a musical tone waveform for each harmonic. 3. The method according to claim 2, wherein the tone color change parameter is a touch velocity, and the ratio setting means is configured to set a ratio of a finely changing portion added to an envelope to be larger as the touch velocity becomes larger. Item 3. The sound source device according to item 1 or 2.