JP2888712B2 - Music generator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tone generator for generating a tone signal for stereo performance, for example, applied to an electronic musical instrument or the like.

[0002]

2. Description of the Related Art In recent years, electronic musical instruments such as electronic pianos, electronic organs, and synthesizers have been developed and widely used. Such an electronic musical instrument generates a tone signal corresponding to the tone data in the tone generator by giving tone data generated by operating a keyboard or an operation panel to a tone generator provided inside the electronic musical instrument. This is converted into sound by a speaker to generate a musical sound.

FIG. 4 is a block diagram showing a schematic configuration of such a conventional tone generator. FIG. 4 shows a configuration example for playing a musical tone in monaural. In FIG.
Reference numeral 0 denotes a system bus of an electronic musical instrument to which the tone generator is applied.
U ”) is supplied to the tone generator 51.

The tone generator 51 comprises a waveform memory 60, a sound source 61 and a D / A converter 62.

The waveform memory 60 is constituted by, for example, a read only memory (hereinafter referred to as "ROM"), and stores a plurality of monaural musical tone waveform data for realizing a plurality of timbres. That is, the waveform memory 60
Is the tone obtained by adding the tone for the right channel and the tone for the left channel, that is, the waveform data (R + L) of the monaural tone.

The sound source 61 reads out the tone waveform data (R + L) from the waveform memory 60 in accordance with the tone data sent from the CPU 10, adds an envelope thereto, and generates a monaural digital tone signal Md. This digital tone signal Md is sent to the D / A converter 62.

[0007] The D / A converter 62 converts the digital tone signal Md supplied from the sound source 61 into an analog tone signal Ma. The analog tone signal Ma converted by the D / A converter 62 is output to the outside as an output signal of the tone generator 51, amplified by an amplifier (not shown), further converted into sound by a speaker, and emitted. become.

The above is an example of a conventional musical sound generating apparatus applied to an electronic musical instrument that generates a musical sound in monaural.
Electronic musical instruments having a stereo performance function have been developed and put to practical use in order to give a sense of realism to the music to be played.

According to such a stereo performance, for example, when an electronic musical instrument is played with the tone of a piano, the manner in which the stringing position of an acoustic piano changes in accordance with the pitch is simulated by stereo playback, thereby realizing a more realistic sound. Performance is possible.

In an electronic musical instrument having an automatic accompaniment function, it is possible to play a melody in a tone such as a piano by using a keyboard with accompaniment sounds of each tone such as a chord, a bass and a drum. However, if stereo playback is applied to such an electronic musical instrument, it is possible to control the sound image localization of each musical instrument sound, and it is possible to perform a more realistic sound.

Conventionally, a tone generator as shown in FIG. 5 has been used to realize such a stereo performance. In FIG. 5, reference numeral 70 denotes a system bus of an electronic musical instrument to which the tone generator is applied, which is used to supply tone data output from a CPU (not shown) to the tone generator 71.

The tone generator 71 comprises waveform memories 80a and 80b, a sound source 81, D / A converters 82a and 82b, and an adder 83.

The waveform memories 80a and 80b store, for example, R
OM, and stores a plurality of tone waveform data for stereo performance for realizing a plurality of timbres. That is, the tone waveform data (R) for the right channel during stereo performance is stored in the waveform memory 80a.
The waveform memory 80b stores tone waveform data (L) for the left channel during stereo performance.

The sound source 81 reads out the tone waveform data (R) and (L) from the waveform memories 81a and 81b alternately in a time-sharing manner in accordance with the tone data sent from the CPU 10, and adds an envelope thereto. , Respectively, to generate a digital tone signal SRd for the right channel and a digital tone signal SLd for the left channel. The generated digital tone signal SRd is sent to the D / A converter 82a, and the digital tone signal SLd is sent to the D / A converter 82b.

The D / A converters 82a and 82b are connected to the sound source 8
Digital tone signals SRd and SLd supplied from 1
Are converted into analog tone signals SRa and SLa, respectively. The analog tone signals SRa and SLa converted by the D / A converters 82a and 82b are output from the tone generator 7
It is output to the outside as one output signal. The analog musical tone signals SRa and SLa are respectively amplified by an amplifier (not shown), converted into sound by a speaker, and a musical tone having a stereo effect is emitted.

On the other hand, there is a case where a monaural performance is required even for an electronic musical instrument capable of performing a stereo performance by providing the musical tone waveform data for the stereo performance. In order to respond to such a demand, the output signal of the D / A converter 82a and D
An adder 83 for adding the output signal of the / A converter 82b is provided, and the signal (R + L) added by the adder 83 is converted into a monaural analog tone signal Ma.

[0017]

However, for example, if the sound source 61 shown in FIG. 4 has 16 oscillators and the polyphonic number (the number of simultaneous sounds) is "16", the sound source 61 shown in FIG. When the same sound source is used in the above configuration, two oscillators for the right channel and the left channel are used to generate one sound, so that the polyphonic number is halved to “8”. In this case, the monaural output (R
+ L) also has a polyphonic number of “8”.

This means that if the same number of polyphonics is to be ensured in the above configuration, a sound source having twice the number of oscillators will be required, resulting in an increase in hardware and complexity, and an increase in cost. There's a problem.

In order to secure the number of "16" polyphonics in the configuration shown in FIG. 5, a configuration in which reproduction is performed based on tone waveform data of only one of the right and left channels is conceivable. Since the musical sound is reproduced in monaural, the possibility of strange sound is high, which is not practical.

The sound waveform data for stereo (R)
And (L) separately from the monaural musical sound waveform data (R +
L) is also conceivable, but there is a problem in that the memory to be used increases and the musical tone waveform data must be separately created, which is troublesome.

Furthermore, in the conventional tone generator, since the sense of stereo spread is fixed depending on the tone waveform data, it is difficult to control the sense of stereo once the tone waveform data is created. There was also a problem that it is.

The present invention has been made in view of such circumstances, and a first object of the present invention is to make it possible to perform monaural and stereo performances with a small amount of musical sound waveform data and to secure a large number of polyphonic numbers during a monaural performance. A generator is provided.

A second object of the present invention is to provide a tone generator capable of controlling the sense of stereo spread with a simple configuration.

[0024]

In order to achieve the first object, a musical sound generator according to a first aspect of the present invention comprises:
First storage means for storing waveform data of musical tones to be produced by the sum of musical tones to be produced by the right channel and musical tones produced by the left channel; and musical tones produced by the right channel and musical tones produced by the left channel. A second storage unit for storing waveform data of a musical tone which is a difference between the first and second waveforms, and generating a Japanese musical tone signal based on the waveform data stored in the first storage unit; and storing a waveform stored in the second storage unit. Tone signal generation means for generating a difference tone signal based on data; addition means for obtaining the sum of the Japanese tone signal generated by the tone signal generation means and the difference tone signal; Subtracting means for calculating a difference between the Japanese musical tone signal and the difference musical tone signal.

In order to achieve the second object,
A musical sound generating device according to a first aspect of the present invention comprises: a first storage means for storing waveform data of a musical tone which is a sum of a musical tone to be produced on a right channel and a musical tone to be produced on a left channel;
Second storage means for storing waveform data of a musical tone which is a difference between a musical tone to be produced on the right channel and a musical tone to be produced on the left channel, and a Japanese musical tone based on the waveform data stored in the first storage means. A tone signal generating means for generating a difference tone signal based on the waveform data stored in the second storage means; and a control signal for generating the difference tone signal generated by the tone signal generating means. Processing means for processing according to the following, and addition means for obtaining the sum of the output signal of the processing means and the Japanese musical tone signal generated by the musical tone signal generating means,
A subtraction unit for calculating a difference between an output signal of the processing unit and the Japanese musical tone signal generated by the musical tone signal generation unit.

[0026]

In the musical sound generating apparatus according to the first aspect of the present invention, the first storage means stores musical sound waveform data (R + L) obtained by summing musical sounds to be produced on both the left and right channels. And the second storage means stores waveform data (RL) obtained by taking the difference between musical tones to be produced in both the left and right channels.

Then, in the musical sound signal generating means, the first
A tone signal (R + L) is generated based on the musical tone waveform data stored in the storage means, and a difference tone signal (RL) is generated based on the waveform data stored in the second storage means.

In the case of a stereo performance, a signal [(R + L) + (RL) = 2R] obtained by adding the above-mentioned Japanese tone signal (R + L) and difference tone signal (RL) by adding means is used for the right channel. A tone signal. Further, a signal [(R) obtained by subtracting the Japanese musical tone signal (R + L) and the difference musical tone signal (RL) by subtracting means.
+ L)-(RL) = 2L] is used as the tone signal of the left channel.

In the case of a monaural performance, the Japanese tone signal (R + L) output by the tone signal generating means is used as it is as a monaural tone signal.

Thus, stereo performance and monaural performance can be realized with the same amount of musical tone waveform data as in the prior art. In the case of monaural performance, all oscillators of the sound source can be assigned to monaural sound generation. Thus, it is possible to secure the number of polyphonics corresponding to the above, and to eliminate the disadvantage that the number of polyphonics is halved.

A tone generation according to the second aspect of the present invention.
The apparatus focuses on the characteristic that the difference tone signal (RL) plays a widening component of the stereo effect. That is, in the tone generating apparatus according to the second aspect of the present invention, in the same configuration as the tone generating apparatus according to the first aspect of the present invention, the difference output by the tone signal generating means is provided. The musical sound signal (RL) is subjected to predetermined processing by processing means and supplied to an adding means and a subtracting means.

As the processing means, for example, a multiplier can be used. The processing means changes the magnitude of the difference tone signal (RL) by, for example, multiplying the difference tone signal (RL) by a predetermined control signal.

Thus, for example, if the magnitude of the predetermined control signal can be controlled from the operation panel, it is possible to realize a tone generator capable of arbitrarily adjusting the sense of spread of the stereo effect.

As a processing means, for example, a delay circuit can be used. The processing means outputs the difference tone signal (R-
L) is delayed according to a predetermined control signal, thereby changing the phase of the difference tone signal (RL).

Thus, for example, if the magnitude of the predetermined control signal is controlled from the operation panel so that the delay time can be changed, the spread of the stereo effect is constant.
A tone generator capable of arbitrarily adjusting the sense of depth of sound can be realized.

[0036]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of a tone generator according to the present invention. In the following,
The configuration and operation relating to the stereo / monaural performance function will be mainly described.

FIG. 1 is a block diagram showing a schematic configuration of an electronic musical instrument to which a tone generator according to the present invention is applied. Each element of the CPU 10, the ROM 11, the random access memory (hereinafter, referred to as "RAM") 12, the panel scan circuit 13, the key scan circuit 15, and the musical tone generator 17 constituting the electronic musical instrument comprises an address bus and a data bus. They are interconnected via a system bus 18.

The CPU 10 controls the entire electronic musical instrument according to a control program stored in the ROM 11. For example, the CPU 10
An assigner process for assigning a tone generation channel in response to the depression of the key No. 6 and an access process to the sound source 21 of the musical tone generator 17 are executed.

The ROM 11 stores a control program for operating the above-described CPU 10 and a CPU.
Various fixed data used by 10 for various processes are stored. The contents stored in the ROM 11 are accessed by the CPU 10 via the system bus 18. That is, CPU
Reference numeral 10 reads out a control program (instruction) from the ROM 11 using the system bus 18, interprets and executes the control program, and reads out predetermined fixed data to use for arithmetic processing.

The RAM 12 temporarily stores various data necessary for executing the control program, and defines various areas such as a data buffer, a register, and a flag. From a keyboard 16 to be described later to a key scan circuit 15
The key data captured via the control panel 14 and the panel switch data captured from the operation panel 14 via the panel scan circuit 13 are also temporarily stored in the RAM 12. The contents stored in the RAM 12 are also accessed by the CPU 10 via the system bus 18.

The operation panel 14 includes switches for instructing the electronic musical instrument to perform various operations, a numerical value input device for inputting numerical values to be set, and a display (not shown) for displaying predetermined information. I have. The above switches include:
A tone color switch for switching the tone, a volume switch for changing the volume, a stereo effect switch for controlling the extent of the stereo effect, and the like are included.

The numerical value input device is used to input various parameters to be set in the electronic musical instrument by numerical values, and is realized by, for example, a dial or a numeric keypad.
The display is constituted by, for example, an LCD.
It is used to display various messages and the status of the electronic musical instrument under the control of U10.

The operation panel 14 is connected to a system bus 18 via a panel scan circuit 13.

The panel scan circuit 13 scans the on / off state of each switch of the operation panel 14 and outputs the data as panel switch data via the system bus 18.
Send to PU10. The panel switch data detected by the panel scan circuit 13 is transmitted under the control of the CPU 10.
It is stored in the RAM 12 and is used for triggering various processes.

The keyboard 16 is composed of keys for the player to specify the pitch of a musical tone, and key switches for opening and closing in conjunction with the keys. This keyboard 16 is connected to the key scan circuit 15.

The key scan circuit 15 includes a keyboard 16
Scans the state of the key switch, outputs the key number of the key turned on or off, detects the pressing strength (pressing speed) of the key, and outputs it as touch data. The key number and the touch data are sent to the CPU 10 via the system bus 18 and stored in the RAM 12 under the control of the CPU 10.

The key number and touch data stored in the RAM 12 are stored in the tone generation circuit 1 at a predetermined timing.
7, which is used for a sound generation process or the like accompanying key-on / key-off.

A first embodiment of the tone generator 17 is shown in FIG.
As shown in the figure, the waveform memory 20 as the first storage means
a, a waveform memory 20b as a second storage means, a sound source 21 as a tone signal generation means, D / A converters 22a and 22b, an adder 23a as an addition means, and an adder 23b as a subtraction means. .

The waveform memories 20a and 20b store, for example, R
OM and pulse code modulation (PC
M) stored musical tone waveform data. The waveform memories 20a and 20b store a plurality of types of tone waveform data corresponding to each tone in order to realize a plurality of tone colors.

The waveform memory 20a stores a musical tone obtained by adding a sound to be emitted on the left channel and a sound to be emitted on the right channel, that is, tone waveform data (R + L) corresponding to a monaural tone. . In the waveform memory 20b,
Musical tone waveform data (RL) of a tone obtained by taking a difference between a sound to be emitted in the left channel and a sound to be emitted in the right channel is stored.

The sound source 21 includes, for example, 16 oscillators, and each of the oscillators operates in a time-division manner based on tone data such as a key number indicating a pitch and touch data indicating a volume sent from the CPU 10. To generate a digital tone signal.

That is, the timbre number corresponding to the timbre selected by the timbre changeover switch of the operation panel 14 is stored in the CPU 10.
, The predetermined tone waveform data in the waveform memories 20a and 20b corresponding to the tone color number is selected.

The waveform memories 20a and 20b
The selected musical tone waveform data (R + L) and musical tone waveform data (RL) are alternately read in a time-division manner at a speed corresponding to the key number sent from the CPU. Then, the read musical tone waveform data is subjected to a predetermined filter process, and an envelope is added based on the touch data sent from the CPU 10, and the digital musical tone signal Md as a Japanese musical tone signal and the digital musical tone signal Md as a differential musical tone signal, respectively. The digital tone signal Sd is output.

Digital tone signal M generated by sound source 21
d is supplied to the D / A converter 22a, and the digital tone signal Sd is supplied to the D / A converter 22a.
/ A converter 22b.

The D / A converters 22a and 22b are connected to the sound source 2
The digital tone signals Md and Sd supplied from 1 are converted into analog tone signals Ma and Sa, respectively. The analog tone signal M output from the D / A converter 22a
a is supplied to one input of each of the adders 23a and 23b.

The analog tone signal Ma output from the D / A converter 22a is a tone signal (R + L) obtained by summing the tone to be produced on both the left and right channels, in other words, a monaural tone signal. Therefore, this analog musical signal Ma
Is output from the tone generator 17 as it is as a monaural tone signal.

The analog tone signal Sa output from the D / A converter 22b is supplied to the other inputs of the adders 23a and 23b.

The adder 23a is connected to the D / A converter 22a.
Analog tone signal Ma output by the D / A converter 22b
Is an adder that adds the analog tone signal Sa output by the adder. Therefore, the output signal SRa of the adder 23a is
Music waveform data (R + L) and music waveform data (RL)
Tone waveform data [(R + L) + (RL)]
= 2R], that is, the tone waveform data (R) for the right channel
Is equal to the analog tone signal generated based on The analog tone signal SRa is output from the tone generator 17 as a right channel stereo tone signal.

The adder 23b is connected to the D / A converter 22a.
From the analog tone signal Ma output by the D / A converter 22
This is an adder for subtracting the analog tone signal Sa output by b. Therefore, the output signal SL of the adder 23b
a is the musical sound waveform data [(R + L) − obtained by subtracting the musical sound waveform data (RL) from the musical sound waveform data (R + L).
(RL) = 2L], that is, equal to the analog tone signal generated based on the tone waveform data (L) for the left channel. The analog tone signal SLa is output from the tone generator 17 as a left channel stereo tone signal.

The stereo tone signals SRa and SLa and the monaural tone signal Ma output from the tone generator 17 are supplied to an amplifier (not shown), amplified at a predetermined amplification factor, and supplied to a speaker (not shown). Then, analog tone signals SRa, SL as electric signals
a or Ma is converted to sound. As a result, a musical tone corresponding to the key operation of the keyboard 16 is emitted.

In this configuration, the number of polyphonics is "8" during stereo performance, but the number of polyphonics can be set to "16" during monaural performance. ”Can be avoided, and rich performances using more sounds can be performed.

A second embodiment of the tone generator 17 is shown in FIG.
As shown in the figure, the waveform memory 20 as the first storage means
a, a waveform memory 20b as a second storage means, a sound source 21 as a tone signal generation means, D / A converters 22a and 22b, an adder 23a as an addition means, an adder 23b as a subtraction means, and a processing means Of the multiplier 24.

This embodiment has the same configuration as the first embodiment except that a multiplier 24 is provided on the output side of the D / A converter 22b. Therefore, the same portions are denoted by the same reference numerals, and description thereof will be omitted. Only different portions will be described.

The multiplier 24 multiplies the output of the D / A converter 22b as one input and the spread control signal as a predetermined control signal supplied from the outside as the other input. The output signal Sa 'of the multiplier 24 is added to the adders 23a and 23b as in the case of the first embodiment.
Are supplied to respective other inputs.

The spread control signal is configured to change its value in conjunction with, for example, a stereo effect switch on the operation panel 14. In other words, this configuration means that the magnitude of the musical tone waveform data (RL) is controlled according to the stereo effect switch and given to the adders 23a and 23b.

By the way, the above tone waveform data (RL)
A tone signal generated on the basis of the tone signal is known in the field of stereo broadcasting, for example, as a signal including an element that gives a difference between the tone on both the left and right channels, that is, a sense of stereo spread. That is, if the signal value is large, the sense of spread of the stereo is increased, and if the signal value is small, the sense of spread of the stereo is reduced.

Therefore, according to the second embodiment, only the tone signal generated based on the tone waveform data (RL) is controlled by the stereo effect switch provided on the operation panel 14, for example. Despite the configuration, the sense of stereo spread can be arbitrarily set according to the player's preference, so that a realistic play can be realized.

In the second embodiment, the multiplier 24 is provided with D /
A configuration is provided at the output stage of the A converter 22b, and the analog signal Sa output from the D / A converter 22b and the spread control signal (analog signal) are analog-multiplied and output. It may be provided between the / A converters 22b to perform digital multiplication.

A third embodiment of the tone generator 17 is shown in FIG.
As shown in the figure, the waveform memory 20 as the first storage means
a, a waveform memory 20b as a second storage means, a sound source 21 as a tone signal generation means, D / A converters 22a and 22b, an adder 23a as an addition means, an adder 23b as a subtraction means, and a processing means Delay circuit 25
Consists of

This embodiment has the same configuration as the first embodiment except that a delay circuit 25 is provided on the output side of the D / A converter 22b. Therefore, the same portions are denoted by the same reference numerals, and description thereof will be omitted. Only different portions will be described.

The delay circuit 25 uses a spread control signal as a predetermined control signal supplied from the outside as a signal for designating a delay time, and outputs the output signal Sa of the D / A converter 22b.
Is output after being delayed by the time specified by the spread control signal. The output signal S of the delay circuit 25
a ″ is the value of the adder 23 as in the case of the first embodiment.
a and 23b are respectively supplied to the other inputs.

The spread control signal is configured to change its value in conjunction with a predetermined switch on the operation panel 14, for example. In other words, this configuration means that the phase of the musical tone waveform data (RL) is controlled according to a predetermined switch and is supplied to the adders 23a and 23b.

Therefore, according to the third embodiment, although the stereo effect has a constant spread, the tone signal generated based on the tone waveform data (RL) is provided on the operation panel 14, for example. With a simple configuration of controlling with a given switch, the sense of depth of the musical tone can be set arbitrarily according to the player's preference, so that a realistic play can be realized.

In the third embodiment, the delay circuit 25
/ A converter 22b is provided at the output stage of the D / A converter 22b.
Is configured to delay the analog signal Sa output by the spread signal according to the spread control signal (analog signal). However, a delay circuit is provided between the sound source 21 and the D / A converter 22b to delay the digital signal. You may comprise so that it may make it.

In the first to third embodiments, the tone waveform data stored in the waveform memory 20b is obtained by subtracting the tone waveform data (L) for the left channel from the tone waveform data (R) for the right channel. The musical tone waveform data (RL) obtained by subtracting the musical tone waveform data (R) for the right channel from the musical tone waveform data (L) for the left channel is stored in the configuration. It is good also as a structure which memorizes.

In this case, the left channel stereo tone signal is output from the adder 23a and the right channel stereo tone signal is output from the adder 23b. However, the same stereo effect can be realized. it can.

In the first to third embodiments, D / D
Although the tone signals converted into analog signals by the A converters 22a and 22b are respectively added and subtracted, a digital signal processing device (DS
P) may be provided to perform addition and subtraction processing in this digital signal processing device.

That is, the digital signal processing device
Performs the addition of the digital tone signals Md and Sd output by the controller to generate a digital tone signal for the right channel, and performs the subtraction to generate a digital tone signal for the left channel. Then, these are converted into analog signals by a D / A converter,
Each of them may be configured to output a stereo tone signal SRa for the right channel and a stereo tone signal SLa for the left channel.

Further, in the first to third embodiments, the envelopes added to the musical tone waveform data (R + L) and the musical tone waveform data (RL) by the sound source 21 are the same as the envelopes based on the touch data. However, different envelopes may be added.

With this configuration, it is possible to obtain a musical tone whose spread varies differently according to the temporal change of the added envelope. In this case, the characteristics of the envelope can be determined according to the strength of key touch, the range of the musical tone to be produced, the tone color of the sound to be produced, and the like.

[0081]

As described in detail above, according to the present invention,
Music waveform data (R + L) and music waveform data (RL)
, It is possible to provide a tone generator capable of performing monaural and stereo performances and securing a large number of polyphonics during monaural performance.

Further, it is possible to provide a tone generator capable of arbitrarily controlling the sense of spaciousness with a simple configuration in which only tone signals generated based on tone waveform data (RL) are controlled.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an electronic musical instrument to which a first embodiment of a musical sound generator according to the present invention is applied.

FIG. 2 is a block diagram showing the configuration of a second embodiment of the musical sound generator according to the present invention.

FIG. 3 is a block diagram showing a configuration of a third embodiment of a musical sound generator according to the present invention.

FIG. 4 is a diagram for explaining a conventional tone generator having a monaural output.

FIG. 5 is a diagram for explaining a conventional tone generator having a stereo output and a monaural output.

[Explanation of symbols]

 Reference Signs List 10 CPU 11 ROM 12 RAM 13 Panel scan circuit 14 Operation panel 15 Key scan circuit 16 Keyboard 17 Musical sound generator 18 System bus 20a, 20b Waveform memory 21 Sound source 22a, 22b D / A converter 23a, 23b Adder 24 Multiplier

Claims (3)

(57) [Claims] 1. A musical tone generating apparatus having a maximum number of simultaneous tones of a predetermined number, wherein waveform data of musical tones which are the sum of musical tones to be produced in a right channel and musical tones to be produced in a left channel are stored. And second storage means for storing waveform data of a musical tone which is a difference between a musical tone to be produced on the right channel and a musical tone to be produced on the left channel. Reading the waveform data from the first storage means and storing the first envelope
Processing for adding and waveform data from the second storage means.
Read out a second envelope different from the first envelope
By executing the process of adding a rope in a time-division manner, a Japanese musical tone signal and a difference musical tone signal including a half of the predetermined number of sounds at the maximum are generated, respectively. By executing the process of reading the waveform data from the first storage means in a time-division manner,
Musical tone signal generating means for generating a musical tone signal containing the predetermined number of sounds at the maximum and outputting the same as a monaural signal; and outputting the musical tone signal and the difference musical tone signal generated by the musical tone signal generating means. An adder for calculating a sum and outputting the sum as a stereo signal of one channel; calculating a difference between the sum tone signal and the difference tone signal generated by the tone signal generator, as a stereo signal of the other channel. And a subtraction means for outputting. 2. A keyboard having a plurality of keys, A tone selection switch for designating a tone.
e, The tone signal generating means, when playing back stereo,
In response to the operation of the key on the board, from the first storage means
Read the waveform data and operate the keyboard keys
A first tone corresponding to the tone designated by the tone switch.
Processing for adding an envelope and the second storage means
Read the waveform data from the keyboard
And the tone corresponding to the tone designated by the tone switch.
Add a second envelope different from the first envelope
By executing each process in a time-sharing manner,
A half tone signal containing half of said predetermined number of sounds and
The method according to claim 1, wherein each of the sound signals is generated.
A musical sound generator as described. 3. The difference generated by said tone signal generating means.
Delay means for delaying a tone signal according to a predetermined control signal
Further comprising a step, The adding means may be configured to generate a sound signal generated by the tone signal generating means.
Between the recorded tone signal and the difference tone signal delayed by the delay means.
Calculate sum and output as stereo signal of one channel
And The subtraction means may be configured to generate the tone signal before
Between the recorded tone signal and the difference tone signal delayed by the delay means.
Calculate difference and output as stereo signal of other channel
The tone generator according to claim 1 or 2, wherein the tone generator generates the tone.