JP4201153B2 - Electronic instrument resonance sound generator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electronic musical instrument resonance sound generator, and more particularly to an electronic musical instrument resonance sound generator capable of obtaining a large resonance effect in a small-scale system.
[0002]
[Prior art]
In a grand piano, when the damper pedal is depressed and turned on, all strings including those played by the hammer are unmuted, with the other strings in harmony with the string played by the hammer being the center. Many resonance sounds are generated. Thereby, a sound quality with a large spread can be obtained.
[0003]
In electronic musical instruments, various proposals have been made so far 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 a performance, a resonance sound sequence corresponding to the string hit by the striking of the plurality of resonance sound sequences is reproduced at an appropriate volume level, and a resonance effect is exhibited. Incidentally, as a conventional technique related to the generation of resonance, there is, for example, Japanese Patent Laid-Open No. 4-98292.
[0004]
[Problems to be solved by the invention]
However, there is a problem that the whole system becomes very large because it is necessary to prepare a large number of resonance sound sequences when trying to obtain a resonance sound effect with a large spread like an actual grand piano. . Specifically, each resonance sound sequence includes a resonance sound waveform memory, a D / A converter that converts a resonance sound signal read from the resonance sound waveform memory into an analog signal, a resonance sound reproduction main amplifier, and a resonance sound signal. Since it is composed of a sound speaker or the like, assuming that N series of resonance sound sequences (N is a positive integer), for example, 10 sequences, are prepared, the resonance sound waveform memory, the D / A converter, and the main amplifier for resonance sound reproduction Each of the 10 resonance sound speakers is required, and the system becomes very large.
[0005]
An object of the present invention is to provide a resonance sound generator for an electronic musical instrument that can solve the above-described problems of the prior art and obtain a desired resonance effect without providing a large-scale reproduction system. .
[0006]
[Means for Solving the Problems]
In order to achieve the above-described object, the present invention provides a resonance sound waveform memory that stores resonance sound waveforms, a sound source circuit that reads a resonance sound from the resonance sound waveform memory, and outputs a resonance sound signal. A spread sound generation circuit for generating a spread resonance sound signal from the output resonance sound signal; and means for reproducing the resonance sound signal generated by the spread sound generation circuit, wherein the spread sound generation circuit includes: A first delay circuit that randomly delays an input resonance signal, a first series circuit that includes a first gain circuit that randomly amplifies the output of the first delay circuit, and a random delay of the input resonance signal Output from the second delay circuit, a second series circuit including a second gain circuit for amplifying the output of the second delay circuit at random, the input resonance signal, and the first series circuit First to add resonance signal An adder circuit; and a second adder circuit that adds the resonance signal output from the second series circuit and the output signal of the first adder circuit and the second adder circuit. It is characterized by the fact that it is a wide resonance sound signal .
[0007]
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. A resonance sound effect can be obtained.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described 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.
[0009]
In the figure, a central processing unit (CPU) 1 controls the operation of each part of the electronic musical instrument according to a control program stored in a program memory part of a 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 apparatus status information and is used as a work area for the CPU 1. Various registers and flags 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.
[0010]
The operation panel 5 includes various switches such as a power switch and a timbre 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 the on state, and sends it to the CPU 1.
[0011]
The keyboard 7 is composed of a plurality of keyboards and a keyboard switch that opens and closes in conjunction with key depression and key release. The keyboard scan circuit 6 checks the state of the keyboard switch, generates touch data indicating the strength (speed) of the keyboard touch from the signal indicating the on / off state, and also turns on / off information and the keyboard number ( Number). The on / off information, keyboard number, and touch data are sent to the CPU 1 via the system bus SB.
[0012]
The sound source circuit 8 reads the original sound waveform data corresponding to the signal output from the CPU 1 from the original sound waveform memory 9, multiplies the original sound waveform data by the envelope, and outputs it as a musical signal a to a DSP (digital signal processor) 11. The sound source circuit 8 reads the resonance sound from the resonance sound waveform memory 10 and outputs it as a resonance sound signal b to the DSP 11. 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 give various effects such as reverb and chorus to the original sound.
[0013]
The original sound sequence signal a ′ output from the DSP 11 is converted into an analog signal by the D / A converter 12 and transmitted to the original sound reproducing main amplifiers 13L and 13R for amplification. 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 and transmitted to the resonance sound reproduction main amplifiers 17L and 17R for amplification. The audio signals amplified by the main amplifiers 17L and 17R are reproduced by a speaker system including the resonance sound speakers 18 and 19, and a resonance sound having a sense of spread is output.
[0014]
Next, a method for creating a resonance sound stored in the resonance waveform memory 10 will be described with reference to FIG. First, a resonance sound is generated from an acoustic grand piano, and this is recorded to obtain a resonance sound waveform as shown in FIG. Next, the resonant sound waveform is passed through a high-pass filter as shown in FIG. 5 (b) to suppress an audio signal of, for example, 200 Hz or less, and a waveform as shown in FIG. Extract. Then, the waveform c is stored in the resonance sound waveform memory 10. The cut-off frequency of the high-pass filter may be 200 Hz or higher.
[0015]
In the present invention, since the high frequency component of the resonance sound is used as the resonance sound waveform stored in the resonance sound waveform memory 10, the amount of resonance sound data can be reduced, and the memory of the resonance sound waveform memory 10 can be reduced. The capacity can be reduced. In addition, a large-sized bass speaker is not necessary as the resonance sound speaker, and the speaker system for reproducing the resonance sound can be miniaturized.
[0016]
Preferably, at least three types of resonance sounds for low, medium, and high sounds are stored in the resonance sound waveform memory 10, and the keyboard of the low, medium, or high sound range is operated. In this case, it is preferable to selectively read out the resonance sound for bass, medium, and treble from the resonance waveform memory 10 respectively, but the present invention is not limited to this.
[0017]
Next, a specific example of the spread generation circuit 11b of the DSP 11 will be described with reference to FIG. FIG. 3 shows a pseudo stereo spread generating circuit, a delay circuit 20 that delays the input resonance b, an adder circuit 21 that adds the resonance b and a signal delayed by the delay circuit 20, The subtracting circuit 22 subtracts the signal delayed by the delay circuit 20 from the resonance sound b. The outputs of the adding circuit 21 and the subtracting circuit 22 are output to the D / A converter 16 as a resonance sound sequence signal b ′. The waveform of the resonance series signal b ′ (output L, output R) is as shown schematically in FIG. 4, and the spread generation circuit 11b shows the properties of a comb filter.
[0018]
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, a first series circuit including a delay circuit 31, a gain (GAIN) circuit 32, a variable resistor 33 and an adder 34, a delay circuit 35, a gain (GAIN) circuit 36, and a variable. The second series circuit is composed of a resistor 37 and an adder 38.
[0019]
The delay circuits 31 and 35 receive low-frequency random noise signals from different low-frequency random noise generators, and their delay amounts, in other words, phases are controlled. Similarly, the gain (GAIN) circuits 32 and 36 receive low-frequency random noise signals from different low-frequency random noise generators, and their gain coefficients, in other words, the volume is controlled. The variable resistors 33 and 37 adjust the resistance values to adjust the mixing ratio of the outputs of the first and second series circuits to the resonance signal b, in other words, the outputs of the first and second series circuits. Adjust the mixing ratio.
[0020]
The adding circuit 34 adds the resonance signal b and the signal of the first series circuit whose phase and volume are randomly changed, and the adding circuit 38 randomly sets the resonance sound b, the phase and volume. The signal of the second series circuit changed to is added and output as a resonance 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 in the figure, the phase and the level change randomly, and it is possible to provide a resonance sound having a large spread like a chorus.
[0021]
In other words, the input resonance signal b is distributed 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 re-synthesizing those signals, a sense of breadth or a sense of stereo can be obtained.
[0022]
FIG. 7 shows an example in which the present invention is applied to a grand piano type electronic piano. First and second original sound reproduction speakers (for middle and high sounds) 14a and 15a are respectively forwardly provided at both ends of the operation panel 51. The first and second original sound reproducing speakers (for low sounds) 14b and 15b are respectively arranged facing downward on the left and right sides of the inside of the case of the electronic piano. In the inner part, the first and second resonance sound speakers 18 and 19 are respectively arranged upward.
[0023]
FIG. 8 shows an example in which the present invention is applied to another electronic piano. First and second original sound reproduction speakers (for middle and high sounds) 14a and 15a are arranged above the left and right sides of the operation panel 52, respectively. First and second original sound reproducing speakers (for low sounds) 14b and 15b are arranged below the left and right sides of 53, and further, the first and second resonance sound speakers 18 and 19 are directed upward on the left and right sides of the upper surface of the housing. Are arranged upward.
[0024]
As described above, according to the present embodiment, a large-capacity memory is not required as a resonance sound waveform memory, and only two small resonance speakers for medium and high sounds are used, and a wide resonance sound can be obtained. You will be able to get Therefore, a desired resonance effect can be obtained using a small reproduction system.
[0025]
【The invention's effect】
As is apparent from the above description, according to the first to third aspects of the invention, the resonance signal is read from the resonance waveform memory and processed into a broad sound by the spread generation circuit to obtain a resonance signal. As a result, a large number of resonance sound waveform memories and a multi-line speaker system are not required, and a desired resonance effect can be provided without providing a large-scale reproduction system. .
[0026]
According to the first and second aspects of the present invention, the spread generation circuit can be realized by a circuit having a simple configuration. Further, according to the invention of claim 3 , since the resonance sound waveform memory is made to accumulate the signal obtained by cutting the low frequency range from the raw resonance sound, 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 data stored in a resonance waveform memory.
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 of 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 of FIG. 5. FIG.
FIG. 7 is a diagram showing an arrangement example of speakers when the present invention is applied to an electronic piano.
FIG. 8 is a diagram showing an arrangement example of speakers when the present invention is applied to another electronic piano.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 8 ... Sound source circuit, 9 ... Original sound waveform memory, 10 ... Resonance sound waveform memory, 11 ... DSP, 11a ... Effect circuit, 11b ... Spreading generation circuit, 17L, 17R ... Resonance sound reproduction amplifier, 18, 19 ... Resonance sound use Speaker.

Claims (3)

A resonance sound waveform memory for storing resonance sound waveforms;
A sound source circuit that reads a resonance sound from the resonance sound waveform memory and outputs a resonance sound signal;
A spread sound generating circuit for generating a spread resonance sound signal from the resonance sound signal output from the sound source circuit;
Means for reproducing the resonance signal generated by the spread sound generation circuit ,
The spread sound generation circuit includes:
A first delay circuit that randomly delays an input resonance signal, and a first series circuit that includes a first gain circuit that randomly amplifies the output of the first delay circuit;
A second delay circuit that randomly delays the input resonance signal, and a second series circuit that includes a second gain circuit that randomly amplifies the output of the second delay circuit;
A first addition circuit that adds the input resonance signal and the resonance signal output from the first series circuit;
The input resonance signal and a second addition circuit for adding the resonance signal output from the second series circuit,
An apparatus for generating a resonance sound of an electronic musical instrument , wherein the output signals of the first and second adder circuits are the resonance signal having the spread . 2. The resonance generating device for an electronic musical instrument according to claim 1, further comprising means for changing an output ratio of signals of the first series circuit and the second series circuit . 2. The resonance sound generator for an electronic musical instrument according to claim 1, wherein the resonance sound waveform memory stores a signal obtained by cutting a low frequency component of the resonance sound collected from the musical instrument.

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