JPH11133973A - Device and method of generating musical sound - Google Patents

Abstract

PROBLEM TO BE SOLVED: To decide a tone independently of a pitch by reversing positiveness and negativeness of the impulse responsive signal to be repeatedly generated so as to change the frequency characteristic of the musical sound signal. SOLUTION: An impulse signal generating unit 50 repeatedly generates the impulse responsive signal having the predetermined length, and an acoustic output unit 60 outputs the sound. Repeating cycle of the impulse responsive signal is changed in response to the sound pitch information, and reading speed of the impulse responsive signal is changed in response to the musical factor information independent of the tone information or the pitch information, and these repeating cycle and the reading speed are separately changed. The impulse signal generating unit 50 generates plural musical sound signal at the same time with time dividing processing so as to generate the polyphonic sound. Furthermore, a timing generating unit 30 outputs the timing control signal for controlling cycle of all circuits of the musical sound generating device to each circuit.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tone generator, and more particularly, to a tone generator using an impulse response signal.

[0002]

2. Description of the Related Art Hitherto, in the field of musical tone generating devices, there has been almost no device for controlling an impulse response waveform signal. However, in some cases, the impulse response waveform signal itself is sampled and stored, and this is repeated and read out, and the repetition cycle is made in accordance with the designated pitch. In this case, if the designated pitch is high, the read repetition cycle is short, and if the designated pitch is low, the read repetition cycle is long. The reading speed of the impulse response waveform signal itself was constant, and the reading speed of the impulse response waveform signal itself did not change even if the pitch was high or low.

[0003]

However, in such a device, the impulse response waveform signal is simply read out and applied to a musical tone, and the contents such as the tone color of the musical tone cannot be changed in various ways. To change the tone color or the like of a normal tone, the frequency component (characteristic) of the tone is changed using a filter or the like.

However, the frequency characteristic (spectrum envelope) of a musical tone can be achieved only by changing the reading speed (generation speed) of the impulse response waveform signal itself. If the generation speed of the impulse response waveform signal is changed, the frequency characteristic expands or contracts on the frequency axis to change the frequency characteristic, and as a result, the timbre also changes. In this case, if the reading speed of the impulse response waveform signal itself is linked with the above-described repetition period of the reading, the tone cannot be determined independently, but the tone is determined according to the pitch, and is dependent on the pitch. You will end up with a toned sound.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and a first object of the present invention is to determine an independent timbre independent of a pitch, and a second object is to generate an impulse response waveform signal. To generate a novel tone signal using the same.

[0006]

In order to achieve the above object, according to the present invention, an impulse response signal having a predetermined length corresponding to the frequency characteristic of a tone signal to be generated is repeatedly generated,
The repetition period of the repetitively generated impulse response signal is changed according to a pitch determining factor, and the generation speed of the generated impulse response signal itself is determined according to a tone determining factor different from the pitch determining factor. Was changed independently of the repetition period.

[0007] Thus, the timbre of the tone signal generated from the impulse response signal is changed independently of the pitch, and the timbre can be freely changed without depending on the pitch. In addition, a desired tone signal is generated by repeatedly generating the impulse response signal, and a novel tone can be generated.

Further, in the present invention, an impulse response signal of a predetermined length corresponding to the frequency characteristic of a tone signal to be generated is repeatedly generated, and some of the repeatedly generated impulse response signals are inverted. As a result, the frequency characteristics of the tone signal change, and, for example, a specific overtone is eliminated / attenuated from the frequency characteristics of the tone, thereby generating a tone having only the remaining harmonic components or a tone having a relatively strong remaining harmonic component. can do.

Further, in the present invention, the waveform shape of the repeatedly generated impulse response signal is switched according to the generated musical factor. This allows the change in the waveform shape of the impulse response signal itself to be linked to the pitch change,
It can be linked to a tone change.

Further, according to the present invention, if the repetition period or reading speed of the impulse response signal changes, the power, energy or volume of the tone signal output based on the impulse response signal also changes. In the present invention, the magnitude of the generated impulse response signal changes based on the repetition period or readout speed of the impulse response signal. As a result, the power, energy, or volume of the output tone signal is kept constant, and does not change according to the repetition period or readout speed of the impulse response signal.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION

1. Principle of the Present Invention FIGS. 12 and 13 show the principle of the present invention. In FIG. 12, the repetition period of the impulse response signal ISj (t) is T1.
Or at T2, this impulse response signal ISj
FIG. 14 shows frequency characteristics (spectrum envelope (envelope), frequency spectrum component characteristics, and formant characteristics) of a musical tone synthesized and generated by the output of (t). This repetition period T determines the pitch of the generated musical tone. Therefore, the repetition period T is determined by pitch information,
It is taken in as the period coefficient f.

When the repetition period T of the impulse response signal ISj (t) is shortened and the pitch is increased, FIG.
As shown in (B1) and (B2), the frequency characteristics do not change much or at all, the density of each frequency component decreases, and the width of the formants does not change. Therefore, the repetition period T
Changes, the pitch changes, but the timbre (frequency component,
The formant characteristic itself does not change.

This impulse response signal ISj (t) is stored for each musical factor in an impulse signal storage section 51 (FIG. 2) in the impulse signal generation section 50 of FIG. This stored impulse response signal ISj
(T) is one of the two impulse response signals ISj (t) of FIG. 13 (A1) or (A1), and FIG. 13 shows the state of repeated reading.

FIG. 13 shows an impulse response signal ISj.
(T) has the same repetition period and the impulse response signal I
When the reading speed of Sj (t) is different, the frequency characteristics (spectrum envelope (envelope), frequency spectrum component characteristics, formant characteristics) of the musical tone synthesized and generated by the output of the impulse response signal ISj (t)
Is shown. The reading speed of the impulse response signal ISj (t) itself determines the timbre (frequency component, formant characteristics) of the generated musical tone. Therefore, the reading speed is determined by musical factor information that is not related to the pitch, for example, timbre information, and is taken in as the envelope coefficient r.

The reading speed of the impulse response signal ISj (t) is increased, and the impulse response signal ISj (t) is increased.
When the time length of (t) is shortened, FIG. 13 (B1) and (B2)
As shown in (1), the density of each frequency component does not change much or at all, the frequency characteristics (frequency spectrum component characteristics, formant characteristics) change, and the width of the formants is widened. Therefore, when the signal reading speed changes, the timbre (frequency component, formant characteristics) changes, but the pitch itself does not change.

The impulse response signal ISj (t) is
For a predetermined length of the tone signal to be generated, a linear prediction method,
It is generated and stored by applying a calculation method such as the cepstrum method. For example, in the cepstrum method, a tone signal having a predetermined length is subjected to a fast Fourier transform by a Fourier transformer and converted into a frequency power spectrum.

The converted power spectrum is logarithmically converted by a logarithmic converter, and further subjected to inverse fast Fourier transform by an inverse Fourier transformer to be converted into a cepstral in the time domain (Kefrange). This cepstrum is causally windowed from the multiplier and window function generator and converted to a complex cepstrum. This complex cepstrum is again subjected to fast Fourier transform by the Fourier transformer and returned to the frequency domain, and the spectrum envelope is obtained.

An example of this spectrum envelope is shown in FIG.
(B1) and (B2) and FIGS. 13 (B1) and (B2). This spectrum envelope is exponentially transformed by an exponential transformer, and is inversely fast-Fourier-transformed by the above-mentioned inverse Fourier transformer and returned to the time domain. As a result, sampling data of the impulse response signal of the minimum phase is generated, and this is stored in the impulse signal storage unit 51 as the impulse response signal ISj (t).

If the repetition period of the impulse response signal ISj (t) changes, this impulse response signal ISj
The power, energy or volume of the tone signal output based on (t) also changes. This impulse response signal I
The magnitude of the generated impulse response signal ISj (t) changes based on the repetition period of Sj (t). As a result, the power, energy or volume of the output tone signal is made constant, and the impulse response signal ISj
It does not change according to the repetition period of (t).

2. 1. Overall Circuit FIG. 1 shows an overall circuit of the musical sound generation device. The performance information generation section 10 generates performance information (tone generation information). The performance information (tone generation information) is information for generating a tone. The performance information generating unit 10 includes a sounding instruction device, an automatic performance device,
Various switches or interfaces.

The performance information (musical tone generation information) is musical factor (factor) information, such as pitch (tone range) information (pitch determining factor), sounding time information, performance field information, and number of sounds information. . The pronunciation time information indicates the elapsed time from the start of the tone generation. The performance field information indicates performance part information, tone part information, instrument part information, and the like.
It corresponds to accompaniment, chord, bass, rhythm, etc., or upper keyboard, lower keyboard, foot keyboard, etc.

The pitch information is fetched as key number data KN. The key number data KN includes octave data (sound range data) and note name data. The performance field information is fetched as part number data PN. The part number data PN is data for identifying each performance area, and is set according to the performance area from which the musical tone for which the sounding operation has been performed originates.

The sounding time information includes tone time data TM
And are based on time count data from key-on events or substituted in the envelope phase. This pronunciation time information is in Japanese Patent Application No. 6-2193.
This is shown in detail in the description and drawings of No. 24 as information on the elapsed time from the start of sounding.

The number-of-sounds information indicates the number of tones sounding simultaneously. For example, based on the number of tones whose on / off data in the assignment memory 42 is "1", this number is based on Japanese Patent Application No. Hei.
9 and FIG. 15 of Japanese Patent Application No. -242878, Japanese Patent Application No. 6-247.
8 and 18 of Japanese Patent Application No. 6855, Japanese Patent Application No. 6-276857.
9 and FIG. 20 of Japanese Patent Application No. 6-276858 of Japanese Patent Application No. 6-276858.
And the flowchart of FIG.

The pronunciation instruction device is a keyboard instrument, a string instrument, a wind instrument, a percussion instrument, a computer keyboard, or the like. The automatic performance device automatically reproduces stored performance information. The interface is MIDI
(Musical instrument digital interface) or the like, which receives and sends out performance information from a connected device.

Further, the performance information generating section 10 is provided with various switches. The various switches are a tone tablet, an effect switch, a rhythm switch, a pedal, a wheel, a lever, a dial, a handle, a touch switch, and the like. belongs to. These various switches generate tone control information. The tone control information is information for controlling the generated tone, which is musical factor (factor) information, tone color information (tone color determining factor), touch information (sound generation). (Speed / strength of instruction operation), number of sounds, effect information, rhythm information, sound image (stereo) information, quantization information, modulation information, tempo information, volume information, envelope information, and the like.

The musical factor information is also combined with the performance information (tone information) and input from the various switches, combined with the automatic performance information, or combined with the performance information transmitted and received by the interface. . The touch switches are provided for each of the sounding instruction devices, and generate initial touch data and after touch data indicating the speed and intensity of the touch.

The timbre information includes a keyboard instrument (such as a piano),
It corresponds to the type of musical instrument (producing medium / producing means) of wind instruments (such as flutes), string instruments (such as violins), and percussion instruments (such as drums), and is taken in as tone number data. The envelope information includes an envelope level, an envelope speed, an envelope phase, and the like.

Such musical factor information is sent to the controller 20, where various signals, data, and parameters, which will be described later, are switched to determine the content of the musical sound. The performance information (tone generating information) and tone control information are processed by the controller 20, various data are sent to the impulse signal generating section 50, and an impulse response signal ISj (t) is generated. The controller 20 includes a CPU, ROM, and R
AM etc.

The program / data storage unit 30 (internal storage medium / means) comprises a storage device such as a ROM or a writable RAM, a flash memory or an EEPROM, and an information storage unit 41 such as an optical disk or a magnetic disk.
The computer program stored in the (external storage medium / means) is copied and stored (installed / transferred). The program / data storage unit 30 also stores (installs / transfers) a program transmitted from an external electronic musical instrument or a computer via the MIDI device or the transmitting / receiving device. The storage medium of the program includes a communication medium.

This installation (transfer / copy) is automatically executed when the information storage unit 41 is set in the musical sound generating apparatus or when the power of the musical sound generating apparatus is turned on, or the operation by the operator is performed. Installed by The above-mentioned program is a program according to a flowchart described later for the controller 20 to perform various processes.

Note that another operating system, a system program (OS), and other programs are stored in the apparatus in advance, and the above-described program may be executed together with the OS and other programs. This program only needs to be able to execute the processes and functions described in the claims together with another program or alone when installed and executed in the present apparatus (computer body).

Further, part or all of the program is stored and executed in one or more other devices other than the present device, and data to be processed from now on is communicated between the present device and another device via communication means. The present invention may be executed by transmitting / receiving already processed data / programs and as a whole of this apparatus and another apparatus.

The program / data storage unit 30 includes:
The above-mentioned musical factor information, the above-mentioned various data and other various data are also stored. These various data include data necessary for time division processing, data for assignment to time division channels, and the like.

In the impulse signal generator 50, an impulse response signal ISj (t) having a predetermined length is repeatedly generated and output from the sound output unit 60. The repetition period of the repetitively generated impulse response signal ISj (t) is changed in accordance with the pitch information, and is changed to the above-mentioned timbre information or musical factor information irrelevant to the pitch. Accordingly, the reading speed (generation speed) of the generated impulse response signal ISj (t) itself is changed, and the repetition period and the reading speed are changed independently of each other.

The impulse response signal ISj (t) has a predetermined finite length L corresponding to the spectrum envelope of the tone signal to be generated. The impulse signal generator 50 generates a plurality of tone signals simultaneously by time-division processing and generates polyphonic sounds.

From the timing generator 30, a timing control signal for synchronizing all the circuits of the tone generator is output to each circuit. The timing control signal includes a clock signal of each cycle, a signal obtained by ANDing or ORing these clock signals, a signal having a cycle of the channel division time of the time division processing, channel number data j, and the like.

3. Assignment Memory 42 FIG. 2 shows the assignment memory 42 of the program / data storage unit 40. In the assignment memory 42,
A plurality (e.g., 16 or 32) of channel memory areas are formed, and data relating to musical tones assigned to a plurality of musical tone generating channels formed in the impulse signal generating section 50 is stored.

In each of these channel memory areas, a period coefficient f (or key number data KN) and an envelope coefficient r (tone number data T
N), waveform start address Sa, waveform end address Ea, and cycle end value Fmax, as well as on / off data, touch data TC, tone time data TM, part number data PN, power data PW, envelope phase data EF, and envelope speed. Data ES, envelope level data EL and the like are stored.

The on / off data indicates whether the assigned musical tone is being keyed on or sounding ("1"), keyed off or muted ("0"). The period coefficient f (key number data KN) indicates the pitch of a musical tone assigned and produced, and is determined according to the pitch information. The upper data of the period coefficient f indicates the range or octave. The frequency number data FN is supplied from the impulse signal generator 5 to the corresponding channel timing by the controller 20.
Sent to 0.

Envelope coefficient r (tone number data TN)
Indicates the timbre of the musical tone assigned and pronounced, and is determined according to the timbre information. The envelope coefficient r is sent by the controller 20 to the impulse signal generator 50 at the corresponding channel timing. The touch data TC indicates the speed or strength of the sounding operation, and is determined according to the touch information.

The power data PW indicates the power of the energy of the waveform of the impulse response signal ISj (t), the repetition period T of each impulse response signal ISj (t) stored in the impulse signal storage unit 51, It is determined based on the reading (generation) speed or waveform shape of ISj (t) itself.

For example, if the power data PW of a certain impulse response signal ISj (t) having a certain pitch is set as a reference to "1", the impulse response signal ISj (t) having the same pitch one octave higher becomes "1". “１ ／” for the impulse response signal ISj (t) having the same pitch two octaves above, “「 ”for the impulse response signal ISj (t) having the same pitch one octave below. For an impulse response signal ISj (t) having the same pitch two octaves below, the result is “4”,.

If the power data PW of the impulse response signal ISj (t) at a certain read speed is set as a reference to "1", "2" is obtained for the same impulse response signal ISj (t) at twice the read speed. For the same impulse response signal ISj (t) with a reading speed three times faster, "3",
.., “「 ”For the impulse response signal ISj (t) having the same reading speed of １ ／, and“ 1 / ”for the same impulse response signal ISj (t) having the reading speed of ３.
3 ", ...

Further, different impulse response signals ISj
Even during (t), the power data PW is set. The impulse response signal ISj (t) has a waveform that changes drastically. If the energy power of the waveform is large, the power data PW is reduced, and the impulse response signal ISj (t) is reduced.
Is a waveform that changes slowly. If the energy power is small, the power data PW is increased.

Of course, if the magnitude (amplitude) of each impulse response signal ISj (t) stored in the impulse signal storage unit 51 is adjusted to have the same energy power, such different impulse response signals ISj
There is no need to set the power data PW during (t).

The power data PW indicates, for different impulse response signals ISj (t), the integrated value of the waveform of the impulse response signal ISj (t) or the sum of the absolute values of the local maximum and minimum values of the waveform. Determined based on

As described above, the power data PW is determined in inverse proportion to the repetition period T, that is, the pitch frequency, between the same impulse response signals ISj (t), and is further inversely proportional to the set timbre, that is, the reading speed. Is determined. However, depending on the impulse characteristics of the tone generation (sound generation) circuit and the conversion characteristics from the electric energy of the speaker to the volume energy, the following is obtained. A, B,
C and D are constants. T is the above repetition period. If it is a pitch frequency, it is reciprocal and substituted into "T". S is the reading speed.

PW = A × (T / S) (n-INV)
(N = 1, 2, 3,...) PW = B × (log−c) (T / S) PW = D × (n−RAD) (T / S) (n = 1, 2,
(3,...)) (N-INV) indicates that the preceding numerical value is raised to the “n power”, and in this case, (T / S) is raised to the “n power”. (Log-
c) shows a logarithmic formula with a base "c". (N-RAD) indicates that the "n-th root" of the following numerical value is obtained. In this case, the "n-th root" of (T / S) is calculated.

The power data PW is converted from the pitch information (key number data KN) and timbre information (tone number data TN) by a table in the program / data storage section 40. Similarly, the pitch coefficient f is also converted from the pitch information (key number data KN) by a table in the program / data storage unit 40, and the envelope coefficient r is also converted to the program / data storage unit 4.
The tone color information (tone number data TN) is converted by the table in 0.

The envelope phase data EF indicates the attack, decay, sustain or release of the envelope, the envelope speed data ES indicates the step value of the operation per one cycle of the digital operation of the envelope, and the envelope level data EL indicates the end of each phase. Indicates a target value at which the envelope calculation value reaches.

Each data in each of these channel memory areas is written at the tone generation start timing, rewritten or read out at each channel timing, and sent to the impulse signal generator 50. The assignment memory 42 may be provided not in the program / data storage unit 40 but in the impulse signal generation unit 50 or the controller 20.

A method of assigning or truncating each tone to a plurality of tone generation systems for generating channels in parallel by the above time-division processing, that is, a plurality of tone generation systems, is described in, for example, Japanese Patent Application No. Hei. ,
Japanese Patent Application No. 1-305818, Japanese Patent Application No. 1-312175
No., Japanese Patent Application No. 2-2098978, Japanese Patent Application No. 2-4095
No. 77 and Japanese Patent Application No. 2-409578 are used.

4. FIG. 3 shows the impulse signal generating section 50 described above. Various impulse response signals ISj (t) are stored in the impulse signal storage unit 51, as shown in FIG. The waveform shapes of these impulse response signals ISj (t) are different, and the timbre when synthesized and output as a tone signal is also different. These impulse response signals ISj (t) are
It corresponds to each of the above musical factor information,
Touches, pitches (ranges) or sounding times, performance fields, envelope phases, etc. are stored in a multiplex manner.

For example, the impulse response signal ISj (t)
Is stored differently for each timbre, of which the impulse response signal ISj (t) of one type of timbre is stored differently for each touch, and the impulse response signal ISj (t) of one type of touch is Stored differently for each sounding time,... Stored differently for each pitch,... Stored differently for each performance field,... Stored differently for each envelope phase.

The musical factor information is stored in the controller 2
0, such various impulse response signals ISj (t)
, And the read address data is stored in the impulse signal selection section 52 and supplied to the impulse signal storage section 51 to select the impulse response signal ISj (t). If the musical factor information changes for each musical tone or during tone generation, the upper read address data is switched, and the read impulse response signal ISj
(T) is also switched.

If the musical factor information is related to the pitch, the change in the waveform shape of the impulse response signal itself is linked to the change in the pitch, and the tone color of the synthesized tone signal is also changed in the pitch. Can be linked. If the musical factor information is related to information other than the pitch, the change in the waveform shape of the impulse response signal itself is linked to the change in the timbre, touch, sounding time, performance field, or synthesized output. The tone of the tone signal
It can be linked to changes in touch, pronunciation time, and performance field.

The impulse signal selecting section 52 has memory areas corresponding to the number of time-division channels, and upper-order read address data corresponding to a musical factor of a musical tone assigned to each channel is stored in each memory area. , Are read out by the channel number data j from the timing generator and supplied to the impulse signal storage 51.

Each impulse response signal ISj (t) in the impulse signal storage section 51 is read by the lower read address data R1 and R2 from the impulse signal read section 53. This lower read address data R
1, R2 is incremented at a speed corresponding to the musical factor information other than the pitch information. Therefore, the reading speed of the impulse response signal ISj (t) is not determined by the pitch information. The impulse response signal ISj (t) is repeatedly read out, and the cycle of the repetition is changed according to the pitch information, and the repetition cycle and the readout speed are determined independently of each other.

Each impulse response signal ISj (t) read from the impulse signal storage section 51 is individually accumulated and synthesized for each channel by an impulse accumulation section 54, and a multiplier 55 outputs a signal from an envelope generator 56. The envelope signal is multiplied and synthesized for each channel, and the tone accumulating section 57 accumulates and synthesizes the tone signals of all channels, and outputs the sound from the sound output section 60.

The envelope generator 56 has the above-mentioned musical factor information (envelope information), that is, envelope speed data ES and envelope level data E.
L, envelope phase data EF
0, stored for each channel, and based on this musical factor information (envelope information),
The speed and level of each phase of the envelope of each channel are set, and the shape of each envelope is determined. This envelope signal is generated in a time-division manner for each channel and sent to the multiplier 55.

The power data PW of each channel is
The controller 20 controls the waveform power control RAM 58
Is stored in the corresponding channel area. Each of the power data PW is sent to the multiplier 55, and the tone signal (the impulse response signal ISj) from the impulse accumulating section 54
(T)) or the envelope data from the envelope generator 56 is multiplied. The waveform power control RAM 58 has a memory area corresponding to the time-division channel, and each power data PW is read in a time-division manner. This switching is performed by the timing generator 30.
Based on channel count data from.

Thus, the impulse response signal ISj
Even if the repetition period T of (t) changes according to the pitch, and the power of the waveform, that is, the volume, changes according to the pitch, this can be adjusted and eliminated. In addition, since the waveform shape of the impulse response signal ISj (t) is different, even if the power of the waveform, that is, the volume changes according to the pitch, it can be adjusted and eliminated.

FIG. 5 shows this impulse response signal ISj.
The relationship between the pitch at (t), that is, the repetition period T and the waveform power is shown. When the impulse response signal ISj (t) is read at a short cycle as shown in FIG. 5A, the waveform energy per unit time increases and the sound volume also increases. On the other hand, when the impulse response signal ISj (t) is read at a long cycle as shown in FIG. 5A, the waveform energy per unit time is reduced and the sound volume is also reduced.

Similarly, although not shown, when the impulse response signal ISj (t) is read out slowly, the waveform energy per unit time increases and the sound volume also increases.
On the other hand, when the impulse response signal ISj (t) is read out quickly, the waveform energy per unit time decreases and the sound volume also decreases.

On the other hand, by multiplying the power data PW, the output impulse response signal I
By controlling the level of Sj (t) (tone signal), it is possible to suppress an extra volume change (power) change due to a repetition period T, ie, a change in pitch or a readout speed, ie, a change in timbre.

The power data PW may be multiplied by the envelope level data EL stored in the assignment memory 42 and sent to the envelope generator 56. Further, the touch data TC stored in the assignment 41 is multiplied by the power data PW to obtain the waveform power control RAM.
58 may be stored. Further, the power data PW may be obtained by calculating the reciprocal of the periodic coefficient f and the envelope coefficient r.

5. FIG. 6 shows the impulse signal reading unit 53 in the impulse signal generating unit 50. The above controller (CP
U) The period coefficient f, envelope coefficient r, waveform start address Sa and waveform end address Ea from 20 are stored in the parameter RAM 501 for each time-division channel. In some cases, the cycle end value Fmax is also stored in the parameter RAM 501 for each time division channel. A memory area corresponding to the number of time-division channels is formed in the parameter RAM 501, and the coefficients f, r, addresses Sa, and Ea corresponding to musical sounds assigned to each channel are stored in the corresponding memory area. If the data f, r, Sa, and Ea are always sent from the assignment 42 in a time-sharing manner, the parameter RAM 501 may have one memory area.

The cycle coefficient f and the cycle end value Fmax
Determines the length of the repetition period T of the impulse response signal ISj (t), determines the pitch of the generated musical tone,
The cycle coefficient f is sequentially and repeatedly accumulated, and the cycle end value Fma
Each time x is reached, the impulse response signal ISj (t) is repeatedly read. The accumulated value of the periodic coefficient f becomes the periodic count value F. This cycle coefficient f and cycle end value F
max is determined by the pitch information (key number data) and is converted from the key number data. The length of the repetition period T determines the pitch of the tone signal generated.

Either the cycle coefficient f or the cycle end value Fmax may be fixed. In the embodiment of FIG. 3, the cycle end value Fmax is the maximum value that the cycle count value F can take (“1111... 11” or “111... 1100... 0”).
, And the cycle end value Fmax is not stored.

The envelope coefficient r determines the reading (generation) speed of the impulse response signal ISj (t), determines the frequency characteristic (formant shape) of the impulse response signal ISj (t), and generates a musical tone. Is determined, and the waveform start address Sa to the waveform end address E
a, the envelope coefficient r is repeatedly accumulated until the lower-order read address data R1, R2 are stored in the impulse signal storage unit 51.
Supplied as 2. When the lower read address data R1 and R2 reach the waveform end address Ea, the reading of the impulse response signal ISj (t) is waited until the cycle count value F reaches the cycle end value Fmax next.

The envelope coefficient r is determined by the musical factor information that is not related to the pitch. For example, the tone color information (tone number data), touch information (touch data), sounding time information (tone time data), performance It is converted from field information (part number data).

The envelope coefficient r or the cycle count f from the parameter RAM 501 is supplied to the FLX via the B register.
With or without passing through 503, the data is accumulated in the lower-order read address data R 1, R 2 or the cycle count value F by the adder 505 through the selector 504, through the accumulation register 506, and through the selector 507. It is stored in the arithmetic RAM 508. Memory areas corresponding to the number of time-division channels are formed in the arithmetic RAM 508, and the data R1, R2, and F corresponding to musical tones assigned to each channel are stored in the corresponding memory areas. The FLX 503 converts floating-point data to fixed-point data.

The data R1, R2, F are stored in the arithmetic RAM 5.
08 to the adder 505 via the selector 510 via the A register 509. The data R
1 and R2 are alternately selected by a selector 518 via an R1 register 511 and an R2 register 512 and sent to the impulse signal storage unit 51. Lower decimal data Fr or data “0” of the cycle count value F from the accumulation register 506 is supplied to the adder 505 via the selector 510. The selector 518 is switched by the clock signal φR1. One cycle of the clock signal φR1 is equal to a division time for one channel as shown in FIG.

The initial value of the lower read address data R1 is "0", the initial value of the lower read address data R2 is the waveform end address Ea, and the initial value of the cycle count value F is "0". The operation RAM 50 is provided by the controller 20 via the selector 507.
8 is stored.

The waveform end address value Ea (cycle end value Fmax) from the parameter RAM 501 is supplied to a comparator 516 via an Ea register and an AND gate group 514. The comparator 516 has lower read address data R1 from the adder 505,
R2 or the cycle count value F is also supplied, and when the lower read address data R1, R2 reaches the waveform end address value Ea, or when the cycle count value F reaches the maximum value “111”.
.. 11 or the maximum approximate value "111... 1100... 0" (cycle end value Fmax), the detection signal is set in the flip-flop 517, and the controller (CPU)
Sent to 20.

The carry-out signal Cout from the adder 505 is supplied as an upper bit group of the comparator 516, and the gate signal of the AND gate group 514 is inverted by an inverter 515 and supplied as an upper bit group of the comparator 516. And the number of bits is matched.

The waveform start address Sa and the waveform end address Ea are also determined by the musical factor information. For example, the pitch information (key number data), timbre information (tone number data), touch information (touch data), It is converted from sounding time information (tone time data), performance field information (part number data), and the like, and stored in the corresponding channel memory area of the parameter RAM 501. The waveform start address Sa and the waveform end address Ea correspond to the various impulse response signals ISj.
Select one of (t). In this case, the impulse signal selection section 52 can be omitted.

6. Overall Process FIG. 7 is a flowchart of the overall process executed by the controller (CPU) 20. The whole process is started by turning on the power of the musical tone generating apparatus, and is repeatedly executed until the power is turned off.

First, various initialization processes such as initialization of the program / data storage unit 40 are performed (step 01). Based on a manual performance or an automatic performance by the sounding instruction device or the automatic performance device of the performance information generating unit 10, A sound generation process is performed (step 02).

In this tone generation process, a tone related to the key-on event is assigned to the searched empty channel. The contents of the musical tones include the performance information (tone generation information) from the performance information generating unit 10, the musical factor information of the musical tone control information, and the program / data storage unit 4 at this time.
0 is determined by the musical factor information already stored.

Next, a mute (attenuation) process is performed based on a manual performance or an automatic performance of the tone generation device or the automatic performance device of the performance information generating section 10 (step 0).
3). In this silencing (attenuation) processing, a channel to which a tone related to the key-off event is assigned is searched, and the tone is attenuated and muted. In this case, the envelope phase of the musical tone related to the key-off event is released, and the envelope level gradually becomes “0”.

Further, if various switches of the performance information generating section 10 are operated, musical factor information corresponding to the switches is taken in, stored in the program / data storage section 40, and the musical factor information is changed. (Step 04). Thereafter, other processes are executed (Step 05), and the processes from Step 02 to Step 05 are repeated.

7. FIG. 8 shows a flowchart of the sound generation process of step 02 performed by the controller (CPU) 20.
In this process, an impulse response signal ISj (t) is generated. The flowchart of FIG. 5 is performed for all time division channels.

First, when a key-on event (sound generation event) based on a manual performance or an automatic performance is transmitted from the sound generation instruction device or the automatic performance device of the performance information generation unit 10 to the controller 20 (step 11), an empty channel is searched. In the area of the assignment memory 42 of the searched empty channel, ON / OFF data of "1", a period coefficient f corresponding to a pitch, an envelope coefficient r corresponding to a timbre, touch data TC, part number data PN,
The tone time data TM of "0", the power data PW corresponding to the pitch, the envelope speed ES, the envelope level EL, the envelope phase EF of "1", and other flags and data Sa, Ea, Fmax to be described later,
n, ΔLad, and WS are written. The period coefficient f and the envelope coefficient r will be described below.

Further, the lower-order read address data R1 of "0", the lower-order read address data R2 set to the waveform end address Ea, and the cycle count value F of "0" are stored in the corresponding channel memory area of the arithmetic RAM 508. The corresponding channel area of the superimposed channel counter (program / data storage unit 40) is reset to "0" (step 12).

Next, the cycle coefficient f and the cycle end value Fmax
Is converted from the key number data (pitch information) KN and stored in the corresponding channel memory area of the parameter RAM 501, and the envelope coefficient r is the tone number data (tone color information) TN, touch data (touch information) TC, tone time data (Sounding time information) TM or part number data (performance field information) PN is converted and stored in the corresponding channel memory area of the parameter RAM 501 (step 13), and other processing is executed (step 14).

The waveform start address Sa and the waveform end address Ea include key number data (pitch information), tone number (tone color information), touch data (touch information),
The parameter R is converted from tone time data (toning time information) or part number data (performance field information).
The data is stored in the corresponding channel memory area of the AM 501 (step 13). The waveform start address Sa and the waveform end address Ea select one of the various impulse response signals ISj (t). In this case, the impulse signal selection section 52 can be omitted.

Further, if there is a musical tone at the start of key-on (start of sound generation) or during key-on (during sound generation) (step 1)
5) The cycle coefficient f is added (accumulated) to the cycle count value F (step 16), and the added value (accumulated value) is the cycle end value Fmax (“1111... 11” or “111.
1100... 0 ") or more (step 17), the cycle end value Fmax is subtracted from the cycle count value F, and the fraction of the cycle count value F is corrected (step 18).

The superimposed channel is switched (steps 18, 21, 22), the lower decimal data Fr of the period count value F is added to the switched waveform head address Sa (step 23), and the lower read is performed. The initial value of the address data R1 or R2 is corrected.

In this superimposed channel, two impulse response signals ISj (t) are alternately read out in a time-division manner and output as one musical tone. As described above, a plurality of musical tones are made polyphonic through additional time-division channels. Is output. The value of this superimposed channel (c
h = 0, 1), the two impulse response signals IS
Reading j (t) is distinguished.

The time length L for reading out one impulse response signal ISj (t) depends on the impulse response signal Ij (t).
If it is longer than the time length T of the repetition period of Sj (t),
The previous impulse response signal ISj (t) and the next impulse response signal ISj (t) overlap. Therefore, if the two impulse response signals ISj (t) are individually read out by channel division, the two impulse response signals ISj (t) are read out and superimposed in parallel. Of course, this number of channels may exceed two.

Next, the lower read address data R1
Is added to the waveform end address Ea (steps 24, 25, 26), and is added to the lower read address data R2 until the envelope coefficient r becomes the waveform end address Ea (steps 27, 28, 29). ). As described above, the two lower read address data R1 and R2 allow the two impulse response signals ISj
(T) is an impulse response signal ISj (t) signal storage unit 5
1 and are superimposed in the impulse accumulator 54 in parallel. The above processing from step 15 to step 29 is repeated over all time division channels (step 30), and other processing is executed (step 3).
1).

8. FIG. 9 shows a time chart of the operation of each unit of the impulse signal reading unit 53. As described above, writing / reading to / from the parameter RAM 501 and the operation RAM 508, switching of the selectors 504, 507, 510, and registers 502, 5096, 509, 511, 5
12, store to 513, strike to flip-flop 517, and open / close of AND gate group 514 are controlled. As these switching control signals, various timing control signals from the above-described timing generator are used.

The cycle end value Fmax is the parameter RA
When stored in M501, the cycle end value Fma
Writing / reading of x is also performed. Of the waveforms in this time chart, those whose high level / low level are indicated by dotted lines are set to a high level or a low level by detection / non-detection of the comparator 516 when write data is present / absent.

9. Reading State FIG. 10 shows a reading state of the impulse response signal ISj (t) from the impulse signal storage unit 51. When the sound starts (key-on), the first impulse response signal I
Reading of Sj (t) is started by the lower read address data R1 (step 24). This lower-order read address data R1 starts incrementing at the speed of the envelope coefficient r.

At the same time, the cycle count value F starts to be incremented at the speed of the cycle coefficient f (steps 15 and 1).
6). When the cycle count value F reaches the cycle end value Fmax (step 17), even if the first impulse response signal ISj (t) is still being read, the second impulse response signal ISj (t) becomes lower. Reading is started by the read address data R2 (step 27). The lower read address data R2 also starts incrementing at the speed of the envelope coefficient r.

When the second period T has elapsed since the start of sound generation (step 17), even if the second impulse response signal ISj (t) is still being read out,
The reading of the third impulse response signal ISj (t) is started by the lower read address data R1 (step 24).

Further, when the third cycle T has elapsed from the start of sound generation (step 17), even if the third impulse response signal ISj (t) is still being read out,
Reading of the fourth impulse response signal ISj (t) is started by the lower read address data R2 (step 27).

As described above, two identical impulse response signals ISj (t) are alternately read by the two lower read address data R1 and R2. Therefore, the length L of the impulse response signal ISj (t) itself
Is longer than the cycle T of repetition, the generation of the previous impulse response signal ISj (t) is continued at the end of each cycle T, and the next impulse response signal ISj (t)
Can be generated repeatedly. These impulse response signals ISj (t) are synthesized and output as one tone signal.

The number of impulse response signals ISj (t) read out in a time-division manner as one tone signal is "2".
May be exceeded. Accordingly, the number of lower-order read address data also increases to R1, R2, R3, R4,..., And the number of steps 24-26, 27-29 also increases.

The number of impulse response signals ISj (t) read out in a time-division manner as one tone signal is "1".
May be. In this case, the impulse response signal ISj (t)
The length L itself becomes shorter than the repetition period T. Therefore, it is determined whether or not the length L of the impulse response signal ISj (t) itself is shorter than the repetition period T. If it is shorter, the processing of steps 27 to 29 is omitted, and the time-division reading system of the impulse response signal ISj (t) becomes one. The length L of the impulse response signal ISj (t) itself is obtained by dividing the difference between the waveform end address Ea and the waveform start address Sa by an envelope coefficient r. Similarly, the repetition cycle T is obtained by dividing the cycle end value Fmax by the cycle count f.

10. Processing of Tone Time Data TM FIG. 11 is a flowchart of the interrupt processing executed by the controller 20 at regular intervals. In this process, the tone time data TM is incremented.

In this processing, each channel area of the assignment memory 42 (steps 41 and 4)
4, 45), for tone data whose on / off data is "1" and a tone is being produced (step 42), the tone time data TM is incremented by "+1" (step 43), and other periodic processing is performed. (Step 46). In this way, the elapsed sounding time of the musical tone of each channel is counted and stored, and is used as described above.

11. FIG. 14 shows a second embodiment of the impulse signal generator 50. In this embodiment, an alternate inversion circuit 66 as shown in FIG. 14 is inserted between the impulse signal storage unit 51 and the impulse accumulator 54. In this embodiment, two channels are assigned to one musical tone. The periodic coefficient f of one of the first channels is in accordance with the specified pitch, and the periodic coefficient of the other second channel is not in accordance with the specified pitch, but is the periodic coefficient of the specified pitch. f
Is set to a period coefficient nf (2f) which is n times (twice) the following.
The power data PW is (n-1) / n further from the set value,
(1/2) or the envelope level data EL is further increased by (n-1) / n, (1/1) from the set value.
2). Others are the same as the above embodiment.

The first impulse response signal ISj (t) read in the first channel is as shown in FIG. 16 (A1), and the first frequency characteristic (frequency spectrum component, formant characteristic) is as shown in FIG. 16 (B1). For example, the second impulse response signal ISj (t) having the frequency n times (doubled) read by the second channel is as shown in FIG. 16A2, and the second frequency characteristic (frequency spectrum component, formant characteristic) is obtained. Is as shown in FIG. 16 (B2). Here, “n = 2”. The interval between the frequency components of the second frequency characteristic of n = 2 times the frequency of FIG. 16 (B2) is n = 2 times the interval of each frequency component of the first frequency characteristic of FIG. 16 (B1). The second frequency characteristic (see FIG. 16 (B
2)) corresponds only to the even-order harmonic of the first frequency characteristic (FIG. 16 (B1)).

Here, the first impulse response signal ISj
(T) From the waveform of (A1), the second impulse response signal IS
If 1 / n (1/2) of j (t) (FIG. 16A2) is subtracted and difference synthesis is performed, only even-order harmonics are subtracted, and a combined impulse response signal ISj (t) (FIG. 16A3) is generated. The synthesized frequency characteristic (FIG. 16B3) is only odd harmonics. The waveform of FIG. 16 (A3) shows that the impulse response signal ISj (t) is (n-1) out of n (2).
(1) The tone is output with its polarity inverted (every other alternate) and output according to the designated pitch.

It is also possible to set n = 3, 4, 5, 6, 7,..., Whereby as shown in FIG. Is inverted and output, and the non-inverted impulse response signal ISj
The level of (t) is (n-1) / n, and the level of the inverted impulse response signal ISj (t) is 1 / n.

The frequency characteristic of this tone signal is nth, 2n
, 3n, 4n, 5n, 6n, 7n
.., Only the frequency components of... Are eliminated / attenuated, and a musical tone having no specific overtone component can be generated. For example, if n = 2, only the second harmonic, the fourth harmonic, the sixth harmonic, the eighth harmonic,... Can be eliminated / attenuated, and this musical tone is suitable for the sound of a closed instrument. Further, for example, if n = 3, only the third harmonic, the sixth harmonic, the ninth harmonic, the twelfth harmonic,... Can be erased / attenuated. For example, if n = 7, the seventh harmonic, the 14th harmonic, the 21st harmonic, the 28th harmonic,...
Can be eliminated / attenuated, and this musical tone is suitable for piano sound.

The two impulse response signals ISj (t) successively read from the impulse signal storage section 51
Is sent directly to the impulse accumulator 54, multiplier 55, and tone accumulator 57 via the selector 63, the selector 59 and the OR gate group 61, and the other
3. Inverters are inverted by the inverter group 65 via the selector 59 and are multiplied by 1 / (n-1) and (1/2) by the multiplier 62, and are stored in the impulse accumulator 54, the multiplier 55 and the musical tone accumulator. It is sent to 57 and accumulated (added) and synthesized (difference synthesized).

The selector 59 is switched by the lower bit of the channel count data CHNo.
The first impulse response signal ISj of the first channel
(T) is output as it is, and the second channel of the second channel is output.
The impulse response signal ISj (t) is inverted in the positive / negative direction and 1 /
It is output as (n-1) times and (1/2 times).
A tone signal as shown in (B3) is generated and output. The frequency characteristic (frequency spectrum component, formant characteristic) of this musical tone signal is composed of harmonics in which only integer harmonics of n have been deleted / attenuated, and if n = 2, only harmonics of odd-order harmonics. The channel count data CHNo is sent from the timing generator 30.

The data of 1 / (n-1) and (1/2) are calculated by the controller 20, stored in the register 82, and supplied to the multiplier 62. This 1 / (n
The thinning order data n for determining the value of -1) is stored in the assignment memory 42 for each channel, and the thinning harmonic order in the frequency characteristics is selectively switched. The decimation order data n and the timbre information (tone number data T
N), and is determined by tone color information from the performance information generator 10.

A thinning flag is sent to the selector 63 as a select signal, and a normal impulse response signal ISj (t) that does not perform the odd harmonic control is sent to the OR gate group 61 via the selector 63. Cumulative (addition) synthesis is performed as shown in FIG. This thinning flag is stored in the assignment memory 42 for each channel.
It is selectively switched whether to generate a musical tone of a specific overtone that has been erased / attenuated or an odd harmonic, or a musical tone that does not have this erase / attenuate or that contains an even harmonic. The thinning flag forms a part of the tone color information (tone number data TN), and is determined by the tone color information from the performance information generating unit 10.

As described above, the above-described impulse response signal ISj used for generating such odd-numbered overtones is used.
If (t) is normally read as shown in FIG. 10, a musical tone without erasure / attenuation of specific harmonics or including even harmonics is generated. Therefore, one impulse response signal IS
From j (t), it is possible to selectively generate a musical tone without elimination / attenuation of specific harmonics or including even-order harmonics and a musical tone with elimination / attenuation or no specific harmonics.

12. FIG. 15 shows a third embodiment of the impulse signal generator 50. In this embodiment, an alternate inversion circuit 66 as shown in FIG. 15 is inserted between the impulse signal storage unit 51 and the impulse accumulating unit 54. In this embodiment, the periodic coefficient f stored in the memory area of the assigned channel of the assignment 42 does not correspond to the designated pitch, but is n times (2 times) the periodic coefficient f of the designated pitch.
X) period coefficient nf (2f). The power data PW is (n-1) / n, (1/2) further from the set value.
Or the envelope level data EL is further set to (n-1) / n, (1/2) from the set value. Others are the same as the above embodiment.

When the periodic coefficient is n times (twice) “nf (2
f)), the impulse response signal ISj (t) read out per unit time becomes n times (2 times). As shown in FIG. 15 (A3), this is output with (n−1) (1) out of n (2) inverted (positively and alternately) inverted and output to the designated pitch. It becomes the musical tone according to. In this case, since the level of the impulse response signal ISj (t) must be set to (n-1) / n, (1/2), the power data PW is further changed from the set value by (n-1) as described above. ) / N, (１ ／) or the envelope level data EL is further set to (n−1) / n, (１ ／) from the set value.

From the impulse signal storage section 51, the above 2
The impulse response signals ISj (t) alternately read by the two lower read address data R1 and R2 are:
One is the selector 63, the selector 59 and the OR gate group 6
1 is sent to the impulse accumulator 54 as it is, and the other is inverted by the inverter group 65 via the selector 63 and the selector 59 and sent to the impulse accumulator 54 to be accumulated (added) and synthesized.

The selector 59 is switched by n-ary data from the n-ary programmable counter 81, and one of the n impulse response signals ISj (t) read out by the lower-order read address data R1 and R2 remains unchanged. The other (n-1) impulse response signals ISj (t) are output after being inverted in sign and output, and a tone signal as shown in FIG. 16 (A3) is generated and output. The frequency characteristic (frequency spectrum component, formant characteristic) of this tone signal is composed of overtones in which only integer overtones of n have been eliminated / attenuated as shown in FIG. 16 (B3). Only. The selector 63 and the thinning flag are the same as those in the second embodiment.

The data “n” is set in the n-ary programmable counter 81 by the controller 20 and incremented by the clock signal 2φR1. The clock signal 2φR1 corresponds to the clock signal φR.
This is a clock signal of twice the frequency of 1. The n-ary programmable counter 81 detects the occurrence of one impulse response signal ISj (t) and the (n-1) inverted impulse response signals ISj (t) out of the n non-inverted signals. I have.

The odd-numbered overtones generated by deleting / attenuating only the integer overtones of n thus generated are optimal as the tone signals of the wind (wind) instrument shown in FIG. One end of this tube is closed and the other is open, odd harmonics are much easier to resonate than even harmonics, and each frequency component of the frequency characteristic is almost an odd multiple (1) of the fundamental wave.
Times, 3 times, 5 times, 7 times ...).

13. Variations of Odd-Order Overtone Configuration FIG. 16 shows variations of the odd-order overtone configuration in which only integer harmonics of n have been eliminated / attenuated. The level of the first impulse response signal ISj (t) (FIG. 16A1) is (n−
When the level of the second impulse response signal ISj (t) of (1) / n, (1/2) level becomes relatively large with respect to the level of the second impulse response signal ISj (t) (FIG. 16A2), a differential composite waveform as shown in FIG. The frequency characteristic is n as shown in FIG.
The characteristic has a characteristic that even-numbered overtones, which are integer overtones, are included.

The first impulse response signal ISj
(T) The second impulse response signal ISj (t) having the 1 / n (1/2) level (FIG. 16A1)
When it becomes relatively small with respect to the level of 2), FIG.
A difference synthesized waveform as shown in (A2) is obtained, and the frequency characteristic becomes a characteristic in which even harmonics, which are integer harmonics of n, are negative values as shown in FIG. 18 (B1). It is possible to obtain such a musical tone waveform in which a part of frequency components which cannot be found in the natural world becomes negative.

In this case, a multiplier or a shifter is provided at the two output terminals of the selector 59, and the level of the other is relatively increased or decreased with respect to one. The level of the impulse response signal ISj (t) is set to (n-1) /
Alternatively, the envelope level data may be changed to (n-1) / n, (1/2).

The present invention is not limited to the above embodiments, but can be variously modified without departing from the spirit of the present invention. For example, the setting of the cycle end value Fmax may be omitted, and the cycle count value F may be fixed to the maximum possible value. In this case, the pitch of the tone signal is determined only by the period coefficient f.

The one impulse response signal ISj
Although the first half and the second half of (t) have the same shape, they may have different shapes. Further, the impulse response signal ISj
Only the first half of (t) may be stored, and this first half may be read back and reversed to generate the second half signal. The impulse response signal ISj (t) may be a signal obtained by sampling and storing an external sound and converting it by the cepstrum method, the linear prediction method, or the like, or may be a signal artificially created by a user.

Further, the present invention can be implemented in an electronic musical instrument, a computer, or the like. The functions of the circuits in the above-described drawings may be implemented by software (flowcharts), and the functions of the flowcharts in the above-described drawings may be implemented by hardware (circuits).

In the impulse response signal ISj (t), the former half waveform and the latter half waveform are often symmetric. In this case, only the first half waveform or the second half waveform is stored in the impulse signal storage unit 51, and after reading this half waveform, the same half waveform is read in reverse and the impulse response signal ISj (T) The whole may be generated. Thereby, the storage amount of the impulse signal storage unit 51 decreases.

The control of the volume power by the power data PW is not limited to the case where the reading (generation) speed S and the repetition period T of the impulse response signal ISj (t) are controlled independently, and one is linked to the other or It is also executed when it depends. In this case, the period coefficient f and the envelope coefficient r are determined according to the same musical factor, for example, pitch, timbre, touch, and sounding time, or one of the data is obtained.
An operation is performed on one of the data to obtain the other.

(1) An impulse response signal of a predetermined length corresponding to the frequency characteristic of the tone signal to be generated is repeatedly generated, and the repetition period of the repeatedly generated impulse response signal is changed according to the pitch determining factor. Let
A computer for generating a musical tone for causing a computer to change at least a generation speed of the generated impulse response signal itself independently of the repetition period in accordance with a tone determinant different from the pitch determinant. Medium storing program / communication method of computer program / musical sound generation device (method).

(2) An impulse response signal having a predetermined length corresponding to the frequency characteristic of the tone signal to be generated is generated, and the generated impulse response signal is controlled to be repeatedly generated at a predetermined cycle. Even if the length of the signal itself is longer than the cycle of the repetitive generation, generation of the impulse response signal is continued at the end of the cycle, and the computer generates the next impulse response signal by superimposing the impulse response signal. Medium for storing computer program for communication / communication method of computer program / musical sound generation device

(3) The pitch determining factor is a factor for determining the pitch of the tone signal, the timbre determining factor is a factor for determining the tone of the tone signal, and the impulse response signal is stored in the storage means. 3. The musical tone generation device according to claim 1, wherein a reading speed of the impulse response signal is determined according to the timbre determining factor, and a repetition period of repetitive reading of the impulse response signal is determined according to the pitch determining factor. Medium for storing computer program for communication / communication method of computer program / musical sound generation device

(4) An impulse response signal of a predetermined length corresponding to the frequency characteristic of the tone signal to be generated is repeatedly generated, and the repetition period of the repeatedly generated impulse response signal is changed according to the pitch determining factor. The generation speed of the generated impulse response signal itself according to a tone determinant different from the pitch determinant,
A medium storing a computer program for generating a musical tone for causing a computer to change the waveform shape of the repetitively generated impulse response signal in accordance with the generated musical factor while changing the repetition period independently of the repetition period. / Communication method of computer program / Musical sound generation device (method).

(5) An impulse response signal of a predetermined length corresponding to the frequency characteristic of the tone signal to be generated is generated, and the generated impulse response signal is controlled to be repeatedly generated at a predetermined cycle. Even if the length of the signal itself is longer than the period of the repetitive generation, the generation of the impulse response signal is continued at the end of the period, and the next impulse response signal is superimposed by a plurality of generating means (reading means). A medium storing a computer program for generating a musical tone for causing a computer to switch the waveform shape of the repeatedly generated impulse response signal in accordance with the generated musical factor / communication method of computer program / Musical sound generator (method).

(6) The pitch determining factor is a factor for determining the pitch of the tone signal, the timbre determining factor is a factor for determining the tone of the tone signal, and the impulse response signal is stored in the storage means. The reading speed of the impulse response signal is determined in accordance with the timbre determining factor, the repetition period of the repetitive reading of the impulse response signal is determined in accordance with the pitch determining factor, and the musical factor is the musical tone signal. 6. A medium storing a computer program for generating a musical tone according to claim 4 or 5, wherein said factor is a factor determining a pitch or a tone determinant different from said pitch determining factor.
Musical sound generator (method).

(7) An impulse response signal having a predetermined length corresponding to the frequency characteristic of the tone signal to be generated is repeatedly generated, and the repetition period of the repeatedly generated impulse response signal is changed. Changing the generation speed of the signal itself, and changing the magnitude of the generated impulse response signal based on the repetition period of the changed impulse response signal or based on the generation speed of the changed impulse response signal itself A medium storing a computer program for generating a musical sound to cause a computer to execute the program / communication method of the computer program / musical sound generating apparatus (method).

(8) The magnitude of the impulse response signal is also changed in accordance with the power of the waveform of the impulse response signal or the speed or strength of the sounding operation. The generation speed of the impulse response signal itself is changed according to the timbre determinant, and is changed independently of the repetition period. The pitch determinant is a sound of the tone signal. A factor that determines the tone, the tone color determining factor is a factor that determines the tone color of the tone signal, and the impulse response signal is stored in storage means,
8. The tone generating apparatus according to claim 7, wherein a reading speed of the impulse response signal is determined according to the tone determining factor, and a repetition period of the repetitive reading of the impulse response signal is determined according to the pitch determining factor. Medium storing computer program / communication method of computer program / musical sound generation device (method).

[0137]

As described in detail above, according to the present invention, an impulse response signal of a predetermined length corresponding to the frequency characteristic of a tone signal to be generated is repeatedly generated, and some of the repetitively generated impulse response signals are generated. Was inverted. Therefore, the frequency characteristics of the musical tone signal change, and, for example, a specific second harmonic is eliminated / attenuated from the frequency characteristics of the musical tone, thereby generating a musical tone having only the remaining harmonic components or a musical tone having a relatively strong residual harmonic component. It has effects such as being able to do.

[Brief description of the drawings]

FIG. 1 shows an overall circuit of a musical sound generation device.

FIG. 2 shows an assignment memory 42.

FIG. 3 shows an impulse signal generator 50.

FIG. 4 shows various impulse response signals ISj (t) stored in an impulse signal storage unit 51.

FIG. 5 shows a difference in waveform power (volume) due to a change in the repetition period T of the impulse response signal ISj (t).

FIG. 6 shows an impulse signal reading section 53 in the impulse signal generating section 50.

FIG. 7 shows a flowchart of the entire processing.

FIG. 8 shows a flowchart of a sound generation process in step 02.

FIG. 9 shows a time chart of the operation of each unit of the impulse signal reading unit 53.

FIG. 10 shows a state in which an impulse response signal ISj (t) is read from an impulse signal storage unit 51.

FIG. 11 shows a flowchart of an interrupt process.

FIG. 12 illustrates the principle of the present invention.

FIG. 13 illustrates the principle of the present invention.

FIG. 14 shows an alternate inversion circuit 66 (50).

FIG. 15 shows another embodiment of the alternate inversion circuit 66 (50).

FIG. 16 shows a waveform obtained by inverting every other impulse response signal by positive and negative and a frequency characteristic.

FIG. 17 shows the resonance principle of a wind (wind) instrument.

FIG. 18 shows waveforms and frequency characteristics obtained by inverting the polarity of every other impulse response signal and changing the level.

[Explanation of symbols]

10: Performance information generator, 20: Controller (CP
U), 30: time generation unit, 40: detour / data storage unit, 41: information storage unit, 42: assignment memory,
50 ... Impulse signal generator, 60 ... Sound output unit, 51
... Impulse signal storage section, 52 ... Impulse signal selection section, 53 ... Impulse signal reading section, 54 ... Impulse accumulation section, 58 ... Waveform power control RAM, 59, 63 ...
Selector, 61 ... OR gate group, 62 ... Multiplier, 64 ...
Latch, 65: Inverter group, 66: Alternating inversion circuit, 8
1 ... Programmable n-ary counter, 501 ... Parameter RAM, 508 ... Operation RAM, 505 ... Adder

Claims (4)

[Claims] An impulse response signal having a predetermined length corresponding to the frequency characteristic of a tone signal to be generated is repeatedly generated, and some of the repetitively generated impulse response signals are inverted between positive and negative. A musical sound generation device characterized by changing frequency characteristics. 2. An impulse response signal having a predetermined length corresponding to a frequency characteristic of a tone signal to be generated is repeatedly generated, and some of the repetitively generated impulse response signals are inverted in positive and negative directions. A tone generation method characterized by changing frequency characteristics. 3. An impulse response signal having the same waveform and n
, One repetition cycle is 1 / n times the other repetition cycle, and one level is lower than the other level or one level is 1 / n of the other level.
These two impulse response signals are differentially synthesized and output, whereby (n-1) impulse response signals of the n number of impulse response signals are inverted and generated, or the impulse response signals themselves are generated. Even if the length of the impulse response signal is longer than the cycle of the repetitive generation, the generation of the impulse response signal is continued at the end of the cycle, and the next impulse response signal is superimposed and generated by a plurality of generation means. The occurrence of the response signal is detected, and based on the detection result, the (n-1) impulse response signals which are repeatedly generated are inverted (n-1) positive and negative, and the level of the impulse response signal which is not inverted is changed to (n- 1) / n, the level of the inverted impulse response signal is 1 / n, and the impulse response signal is stored in the storage means. 2. The musical tone generation according to claim 1, wherein the read speed of the impulse response signal is determined according to a timbre determining factor, and a repetition period of the repeated reading of the impulse response signal is determined according to a pitch determining factor. apparatus. 4. The repetition period of the repeatedly generated impulse response signal is changed according to a pitch determining factor, and the repetition period is 1 / n of the set pitch. The generation speed of the impulse response signal itself is changed according to a tone determining factor, and the pitch determining factor is a factor for determining the pitch of the tone signal. The tone determining factor determines the tone of the tone signal. The impulse response signal is also repeatedly generated without being inverted, and the tone signal generated by the impulse response signal is
The tone signal is output as a tone signal different from the tone signal by (n-1) positive / negative inversion of the n signals, the output of both tone signals is switched, and at least two tone signals are converted from one impulse response signal. 4. The musical sound generating device according to claim 1, wherein the musical sound is generated.