JP2001272981A - Resonance sound generating device for electronic musical instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a resonance sound generating device for an electronic musical instrument capable of obtaining a desired resonance effect without being provided with a large scale reproducing system. SOLUTION: Resonance sound of middle and high sound pitch ranges are stored in resonance sound waveform memory 10 cutting off the low sound pitch domain. A sound source circuit 8 sends a musical sound signal a read from original sound waveform memory 9 and a resonance sound signal b read from the resonance sound waveform memory 10 to a DSP 11. The DSP 11 has a spatial impression generating circuit 11b for processing the resonance sound signal b into a voice signal with spatial impression b', and processes the resonance sound signal b into the voice signal with spatial impression b' to output it. The voice signal with spatial impression b' is reproduced by resonance sound loudspeakers 18, 19. The spatial impression generating circuit 11b can be configured of, for example, a circuit for delaying the input resonance signal b, a circuit for adding the delayed signal to the input resonance signal b, and a circuit for subtracting the delayed signal from the input resonance signal b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resonance sound generating apparatus for an electronic musical instrument, and more particularly to a resonance sound generating apparatus for an electronic musical instrument capable of obtaining a large resonance effect with a small-scale system.

[0002]

2. Description of the Related Art In a grand piano, when a damper pedal is depressed and turned on, muting of all strings, including strings struck by a hammer, is released, and the strings in harmony with the strings struck by the hammer. Many resonances are generated around the string. As a result, it is possible to obtain a sound quality with a large spread.

Various proposals have been made for electronic musical instruments in order to generate a resonance sound similar to that of a grand piano. An example of this proposal is as follows. That is, a plurality of types of resonance sound waveforms are built in the memory, and a plurality of resonance sound sequences other than the original sound sequence are prepared. When the damper pedal is turned on during the performance, a resonance sound sequence corresponding to a string struck by striking of the plurality of resonance sound sequences is reproduced at an appropriate volume level, and exhibits a resonance sound effect. Note that, as a conventional technique related to the generation of resonance, there is, for example, Japanese Patent Application Laid-Open No. 4-98292.

[0004]

However, in order to obtain a resonance effect with a large spread like an actual grand piano, it is necessary to prepare a large number of resonance sound sequences, and the entire system is very difficult. There was a problem of becoming large-scale. Specifically, each of the resonance sound series includes a resonance sound waveform memory, a D / A converter for converting a resonance sound signal read from the resonance sound waveform memory into an analog signal, a resonance sound main amplifier, and a resonance sound reproduction main memory. Since it is composed of a speaker for sound and the like, if N series (N is a positive integer) of, for example, 10 series are prepared, the resonance sound waveform memory,
A D / A converter, a main amplifier for resonance sound reproduction, and ten speakers for resonance sound are required, and the system becomes very large.

An object of the present invention is to provide a resonance sound generating apparatus for an electronic musical instrument which can solve the above-mentioned problems of the prior art and can obtain a desired resonance sound effect without having a large-scale reproduction system. It is in.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention provides a resonance sound waveform memory for storing resonance sound waveforms, reading a resonance sound from the resonance sound waveform memory, and outputting a resonance sound signal. Sound source circuit, a spread sound generation circuit that generates a widened resonance sound signal from the resonance sound signal output from the sound source circuit, and a unit that reproduces the resonance sound signal generated by the widespread sound generation circuit. There is a characteristic in that.

According to this feature, the resonance sound signal stored in the resonance sound waveform memory can be read out and converted into a sound signal having a sense of spread by the spread sound generation circuit. Thus, an effective resonance effect can be obtained.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings. FIG. 1 is a block diagram showing a configuration of an embodiment of an electronic musical instrument (for example, an electronic piano) of the present invention.

In the figure, a central processing unit (CPU) 1
Controls the operation of each section of the electronic musical instrument according to a control program stored in the program memory section of the ROM 2. The ROM 2 stores a program for controlling the operation of the entire electronic musical instrument and various fixed data used by the CPU 1. These programs and fixed data are accessed by the CPU 1 via the system bus SB. The RAM 3 stores status information of the apparatus and is used as a work area for the CPU 1. Various registers, flags, and the like for controlling the electronic musical instrument are defined in the RAM 3, and the RAM 3 is accessed by the CPU 1 via the system bus SB.

The operation panel 5 has various switches such as a power switch and a tone color selection switch, and a display for displaying predetermined information. The panel scan circuit 4 checks the set / reset state of each switch provided on the operation panel 5, detects panel switch data in an on state, and sends the data to the CPU 1.

The keyboard 7 is composed of a plurality of keys, key presses thereof,
And a keyboard switch that opens and closes in response to key release. The keyboard scan circuit 6 checks the state of the keyboard switch, generates touch data indicating the strength (speed) of keyboard touch from a signal indicating the on / off state, and also generates on / off information and its keyboard number ( Number). The on / off information, the keyboard number, and the touch data are sent to the CPU 1 via the system bus SB.

A tone generator circuit 8 reads out original sound waveform data corresponding to a signal output from the CPU 1 from an original sound waveform memory 9, multiplies the original sound waveform data by an envelope, and generates a DSP (digital signal processor) 11 as a tone signal a.
Output to The sound source circuit 8 reads a resonance sound from the resonance sound waveform memory 10 and outputs the resonance sound as a resonance sound signal b to the DSP.
11 is output. The DSP 11 has an effect circuit 11a arranged in the original sound sequence, and a spread generation circuit 11b provided in the resonance sound sequence according to the present invention. The effect circuit 11a can apply various effects such as reverb and chorus to the original sound.

The original sound sequence signal a 'output from the DSP 11 is converted into an analog signal by the D / A converter 12, transmitted to the main amplifiers 13L and 13R for original sound reproduction, and amplified. The audio signals amplified by the main amplifiers 13L and 13R are reproduced by a speaker system including high-frequency speakers 14a and 15a and low-frequency speakers 14b and 15b. On the other hand, the resonance sound sequence signal b 'output from the DSP 11 is converted into an analog signal by the D / A converter 16, transmitted to the resonance sound main amplifiers 17L and 17R, and amplified. The main amplifiers 17L and 17R
The amplified audio signal is supplied to the resonance sound speakers 18 and 19.
, And a resonant sound with a sense of spaciousness is output.

Next, a method of creating a resonance sound to be stored in the resonance sound waveform memory 10 will be described with reference to FIG. First, a resonance sound is generated from an acoustic grand piano, which is recorded and a resonance sound waveform as shown in FIG. Next, the resonance sound waveform is shown in FIG.
As shown in (b), a high-pass filter as shown in FIG.
Extract a waveform like (c). Then, the waveform c is stored in the resonance sound waveform memory 10. The cutoff frequency of the high-pass filter may be 200 Hz or more.

According to the present invention, the resonance sound waveform stored in the resonance sound waveform memory 10 uses the high frequency component of the resonance sound, so that the data amount of the resonance sound can be reduced. 10 memory capacity can be reduced. Further, a large-sized bass speaker is not required as the resonance speaker, and the speaker system for reproducing the resonance can be downsized.

Preferably, at least for low-pitched sound,
Three types of resonance tones for the middle tone and the high tone are stored in the resonance sound waveform memory 10, and when a low tone, a middle tone, or a high tone keyboard is operated, the low tone and the middle tone are respectively used. And the resonance sound for high-pitched sound is stored in the resonance sound waveform memory 1.
It is preferable to selectively read from 0, but the present invention is not limited to this.

Next, the spread generation circuit 1 of the DSP 11
A specific example of 1b will be described with reference to FIG. FIG.
A delay circuit 20 for delaying an input resonance tone b, and an addition circuit 21 for adding the resonance tone b and a signal delayed by the delay circuit 20;
And a subtraction circuit 22 for subtracting the signal delayed by the delay circuit 20 from the resonance tone b. The outputs of the addition circuit 21 and the subtraction circuit 22 are output to the D / A converter 16 as a resonance sound sequence signal b '. The waveform of the resonance sound series signal b '(output L, output R) is as shown in FIG. 4 and the spread generation circuit 11b
This shows the properties of the comb filter.

Next, another specific example of the spread generation circuit 11b will be described with reference to FIG. FIG. 5 shows a chorus type spread generation circuit, in which a delay circuit 31, a gain (GAI)
N) a first series circuit including a circuit 32, a variable resistor 33, and an adder 34; and a second series circuit including a delay circuit 35, a gain (GAIN) circuit 36, a variable resistor 37, and an adder 38. .

The delay circuits 31 and 35 receive low-frequency random noise signals from different low-frequency random noise generators, respectively, and control the delay amount, in other words, the phase. Similarly, the gain (GAIN) circuits 32 and 36 also receive low-frequency random noise signals from different low-frequency random noise generators, and their gain coefficients, in other words, the volume are controlled. The variable resistors 33 and 37 adjust the resistance value so that the mixing ratio of the outputs of the first and second series circuits to the resonance signal b, in other words,
The mixing ratio of the outputs of the first and second series circuits is adjusted.

An adder circuit 34 adds the resonance signal b and a signal of a first series circuit whose phase and volume have been randomly changed.
The signal of the second series circuit whose phase and volume are changed at random is added and output as a resonance sound series signal b '. FIG. 6 shows a waveform example of the resonance sound sequence signal b ′ (output L, output R) obtained by this specific example. As shown, the phase and level will vary randomly, providing a large, expansive resonance like a chorus.

In other words, the input resonance signal b is divided into several signals, each of which is subjected to irregular phase modulation. For this reason, slight changes in pitch and timing are created, and by recombining those signals, a feeling of spread or a sense of stereo can be obtained.

FIG. 7 shows an example in which the present invention is applied to a grand piano type electronic piano. First and second original sound reproducing speakers (for middle and high frequency) 1 are provided at both ends of an operation panel 51.
4a and 15a are respectively arranged facing forward, and first and second original sound reproducing speakers (for low-pitched sound) 14b and 15b are respectively arranged facing down on the left and right inside the housing of the electronic piano. Further, a first,
The second resonance sound speakers 18 and 19 are respectively arranged upward.

FIG. 8 shows an example in which the present invention is applied to another electronic piano, in which first and second original sound reproduction speakers (for medium and high frequencies) 14a and 15a are disposed above the left and right sides of an operation panel 52, respectively. The first and second original sound reproduction speakers (for low frequency) 14b, 15b are arranged below the left and right sides of the keyboard 53, respectively.
Further, the first and second resonance sound speakers 18 and 19 are respectively arranged upward and to the left and right of the upper surface of the housing.

As described above, according to the present embodiment, a large-capacity memory is not required as the resonance sound wave type memory, and the spread of the sound can be achieved only by using two small-sized middle and high frequency resonance sound speakers. A certain resonance sound can be obtained. Therefore, a desired resonance effect can be obtained using a small-sized reproduction system.

[0025]

As is apparent from the above description, according to the first to fifth aspects of the present invention, the resonance sound signal is read from the resonance sound waveform memory and processed into a sound having a spread by the spread generation circuit. Since the resonance sound signal is used, a large number of resonance sound waveform memories and multiple speaker systems are not required, and a desired resonance sound effect can be provided without providing a large-scale reproduction system. Will be able to

According to the second to fourth aspects of the present invention, the spread generation circuit can be realized by a circuit having a simple configuration. Further, according to the fifth aspect of the present invention, a signal obtained by cutting a low-frequency range from a raw resonance tone is stored in the resonance sound waveform memory, so that the capacity of the resonance sound waveform memory can be reduced. become.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a schematic configuration of an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a method of creating resonance sound data stored in a resonance sound waveform memory.

FIG. 3 is a circuit diagram showing a specific example of the spread generation circuit of FIG. 1;

FIG. 4 is a diagram illustrating an example of an output signal waveform of the spread generation circuit in FIG. 3;

FIG. 5 is a circuit diagram showing another specific example of the spread generation circuit of FIG. 1;

6 is a diagram illustrating an example of an output signal waveform of the spread generation circuit in FIG. 5;

FIG. 7 is a diagram showing an example of speaker arrangement when the present invention is applied to an electronic piano.

FIG. 8 is a diagram showing an example of speaker arrangement when the present invention is applied to another electronic piano.

[Explanation of symbols]

8 sound source circuit, 9 original sound wave memory, 10 resonance sound wave memory, 11 DSP, 11a effect circuit, 11
b: Spread generation circuit, 17L, 17R: Resonance sound reproduction amplifier, 18, 19: Resonance sound speaker.

Claims (5)

[Claims] 1. A resonance sound waveform memory for storing a resonance sound waveform, a sound source circuit for reading a resonance sound from the resonance sound waveform memory and outputting a resonance sound signal, and a sound source circuit output from the resonance sound signal output from the sound source circuit A resonance sound generation apparatus for an electronic musical instrument, comprising: a spread sound generation circuit for generating a resonance sound signal having a characteristic; and means for reproducing the resonance sound signal generated by the spread sound generation circuit. 2. The spread sound generation circuit, comprising: a delay circuit that delays an input resonance signal; an addition circuit that adds the input resonance signal and the resonance signal delayed by the delay circuit; A subtraction circuit for subtracting a resonance signal delayed by the delay circuit from a sound signal, wherein an output signal of the addition circuit and the subtraction circuit is the widened resonance signal. 2. The resonance sound generator for an electronic musical instrument according to claim 1. 3. The spread sound generation circuit includes: a first delay circuit for randomly delaying an input resonance signal; and a first delay circuit for randomly amplifying an output of the first delay circuit.
A first series circuit including a gain circuit, a second delay circuit for randomly delaying an input resonance signal, and a second delay circuit for randomly amplifying an output of the second delay circuit.
A second series circuit including a gain circuit, a first addition circuit that adds the input resonance signal, and a resonance signal output from the first series circuit, the input resonance signal, and the second resonance circuit. A second adding circuit for adding the resonance signal output from the series circuit, wherein the output signals of the first and second adding circuits are the widened resonance signal. Item 2. A resonance sound generator for an electronic musical instrument according to item 1. 4. The apparatus according to claim 3, further comprising means for changing an output ratio of a signal between the first series circuit and the second series circuit. 5. The resonance sound generating apparatus for an electronic musical instrument according to claim 1, wherein a signal obtained by cutting a low frequency component of a resonance sound collected from the musical instrument is stored in the resonance sound waveform memory.