JPH11161270A - Musical sound producing device and method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable change of tone color without changing the shape of musical sound waveform signals by changing the phase of the musical sound waveform signals generated repeatedly, and enable the musical sound waveform signals changed in its phase to be switched from the musical sound waveform signals generated repeatedly and outputted continuously. SOLUTION: In a musical sound signal generation unit 5, musical sound waveform signals having a specified length are generated repeatedly and outputted from a surround system 6. According to sound pitch information the generation speed of the repeatedly generated musical sound waveform signal varies while the waveform of the repeatedly generated musical sound waveform signal is changed over according to musical factor information. The phase of musical sound waveform signal read out is changed according to harmony length data. Since the harmony length data is changed for each repeating area, the phase of musical sound waveform signal for each respecting area is changed differently, the musical sound waveform signals with the different phases are changed over sequentially, and they are outputted continuously.

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 an apparatus for changing the phase of a tone waveform signal that is repeatedly generated.

[0002]

2. Description of the Related Art Conventionally, in a tone generator, a plurality of tone waveform signals are stored, selected according to a designated tone color, the selected tone waveform signals are repeatedly read out, and the tone data is multiplied by envelope data. Is output as
The stored tone waveform signal has one wavelength, and the tone waveform signal of one wavelength is repeatedly read from the beginning to the end.

[0003]

With such an apparatus, 1
To change the timbre of one musical tone, it is conceivable to switch or filter a musical tone waveform signal stored and repeatedly read out to another different musical tone waveform signal. An object of the present invention is to change the timbre by a different method.

[0004]

In order to achieve the above object, according to the present invention, the phase of a tone waveform signal that is repeatedly generated is changed, and the tone waveform signal whose phase has been changed is replaced by one.
Of the two musical tones, the tone waveform signal repeatedly generated was switched and continuously output.

[0005] Thus, by changing the phase of the tone waveform signal in one tone, the tone changes, and the tone can be changed without changing the shape of the tone waveform signal.
The timbre changes due to the phase change because, even if the tone waveform signal of the same waveform shape has a different phase, its frequency characteristics (spectrum envelope (envelope), frequency spectrum component,
This is because the formant shape) changes.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION 1. Overall Circuit FIG. 1 shows an overall circuit of the musical sound generation device. The performance information generating section 1 generates performance information (tone generation information). The performance information (tone generation information) is information for generating a tone. The performance information generating section 1 is a sounding instruction device, an automatic performance device, various switches or interfaces played by manual operation.

The performance information (musical tone generation information) is musical factor (factor) information, and includes pitch (tone range) information (pitch determining factor), sounding time information, performance field information, number of sounds, resonance degree. Information. The pronunciation time information indicates the elapsed time from the start of the tone generation. The performance field information indicates performance part information, musical tone part information, instrument part information, and the like, and corresponds to, for example, a melody, accompaniment, chord, bass, rhythm, or the like, or an upper keyboard, a lower keyboard, a foot keyboard, and the like.

[0008] The pitch information is taken in 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 is the 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 that are sounding simultaneously. For example, the number is based on the number of tones whose ON / OFF data of the waveform control memory 11 is "1".
9 and 15 of Japanese Patent Application No. 2878, Japanese Patent Application No. 6-247785.
5 and 8, FIGS. 9 and 20 of Japanese Patent Application No. 6-276857, and FIGS. 9 and 21 of Japanese Patent Application No. 6-276858.

The resonance degree information indicates the degree of resonance between one musical tone being produced and another musical tone. The pitch frequency of this one tone and the pitch frequency of the other tone are 1: 2, 2: 3, 3:
If the ratio is a small integer multiple such as 4, 4: 5, 5: 6, the value of the resonance degree information is large, and 9: 8, 15: 8, 15:16,
If the ratio is a large integer multiple such as 45:32 or 64:45, the value of the resonance degree information becomes small. This resonance degree information is read from the resonance correlation table 53 or the resonance ratio table 54 in FIG. 7 of Japanese Patent Application No. 1-314818.

The sounding instruction device is a keyboard instrument, a string instrument, a wind instrument, a percussion instrument, a keyboard of a computer, 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 1 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 pronunciation information, resonance degree information, 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 2, where various signals, data, and parameters, which will be described later, are switched, and the content of the musical tone is determined. The performance information (tone generation information) and tone control information are processed by the controller 2, various data are sent to the tone signal generator 5, and a tone waveform signal MW is generated. Controller 2
Is composed of a CPU, a ROM, a RAM, and the like.

The program / data storage unit 4 (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 7 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 4 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.

The installation (transfer / copy) is automatically executed when the information storage unit 7 is set in the musical tone generating apparatus or when the power of the musical tone generating apparatus is turned on. Installed by The above-mentioned program is a program according to a flowchart described later for the controller 2 to perform various processes.

It should be noted 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, a part or all of the program is stored and executed in one or more other apparatuses other than the present apparatus, and data to be processed is communicated between the present apparatus and another apparatus via a 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 section 4 also stores the above-mentioned musical factor information, the above-described various data, and other various data. These various data include data necessary for time division processing, data for assignment to time division channels, and the like.

In the tone signal generator 5, a tone waveform signal MW having a predetermined length is repeatedly generated and output from the sound system 6. The generation speed of the repeatedly generated tone waveform signal MW is changed according to the pitch information. Also, according to musical factor information such as the above pitch color information,
The waveform shape of the tone waveform signal MW repeatedly generated is switched. The tone signal generator 5 generates a plurality of tone signals simultaneously by time-division processing and generates polyphonic sounds.

From the timing generator 3, a timing control signal for synchronizing all the circuits of the musical 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 a channel division time of the time division processing, channel number data CHNo, and the like.

2. FIG. 2 shows the waveform control table 41 of the program / data storage unit 4. The following waveform control data group is stored in the waveform control table 41 in a multiplexed manner for each musical factor, and if the designated musical factor is changed, the content of the following waveform control data group is also changed. The waveform control data group of one musical factor includes a plurality of sets of data groups, and one set of waveform control data groups includes a frequency number ratio FNR,
Start address SA, harmonic length HL, end address E
A, the number of repeats RN, and the number of crossfades CN. The musical tone waveform in one repeat section in FIG. 4 is controlled by this set of waveform control data groups.
In one tone, a plurality of repeat sections are sequentially switched as shown in FIG. The plurality of sets of waveform control data correspond to the plurality of repeat sections.

The frequency number ratio data FNR indicates a correction ratio with respect to the designated pitch, and the designated pitch is finely adjusted and changed. Although shown as frequency number data FN in FIG. 2, actually frequency number ratio data FN
NR. The start address data SA indicates the head address of one tone waveform signal MW stored in the waveform memory 13 as shown in FIG. The end address data EA indicates the end address of one tone waveform signal MW stored in the waveform memory 13 as shown in FIG.

The harmonic length data HL is one tone waveform signal MW stored in the waveform memory 13 as shown in FIG.
Shows the read start address of the read. This harmonic length data HL
Thus, the phase of the read tone waveform signal MW is changed. The repeat number data RN indicates the number of times that the tone waveform signal MW is repeatedly generated (read) in the repeat section of FIG. The cross-fade number data CN indicates the number of repetitions of the tone waveform signal MW in the cross-fade section shown in FIGS.

A plurality of sets of these data are stored for a plurality of repeat sections. The values of these data are different or the same for each repeat section. Therefore, the length of the repeat section, the length of the crossfade section, and the frequency number ratio, that is, the pitch, may or may not change within one musical tone.

Since the harmonic length data HL is also changed for each repeat section, the tone waveform signal M for each repeat section is changed.
The phases of W are changed and changed, and the respective tone waveform signals MW having different phases are sequentially switched and connected, and subsequently output. Note that the harmonic length data HL may be the same in all or some of the repeat sections.

If the start address data SA and the end address data EA are different for each repeat section, the tone waveform signal MW read from the waveform memory 13 is switched. As a result, the tone waveform signal M for each repeat section is changed.
The waveform shape of W also switches. Note that the start address data SA and the end address data EA may be the same in all or some of the repeat sections.

3. FIG. 6 shows the tone signal generator 5 described above. Waveform control memory 1
The controller 2 copies (transfers) the waveform control data group from the waveform control table 41 of the program / data storage unit 4 to 1. This copy is performed for each waveform control data group of one musical factor. The waveform control memory 11 has a plurality of (16, 32 or 64, etc.) channel memory areas formed therein. As shown in FIG. 2, the tone signals assigned to the plurality of tone generation channels formed in the tone signal generator 5 are shown. The waveform control data group corresponding to the musical factor is written.

The pitch of the musical tone assigned to each channel is multiplied (calculated) by the frequency number ratio data FNR of the waveform control table 41, and the waveform control memory 11
Is obtained. Of course, the frequency number data FN corresponding to the pitch of the musical sound assigned to each channel may be written as it is. Pitch (key number data KN) according to the tone of each channel above
Is converted into each frequency number data FN by a frequency number table (not shown).

On / off data is stored in each channel memory area of the waveform control memory 11. The on / off data indicates whether the assigned musical tone is being keyed on or sounding ("1"), keyed off or muted ("0"). This on / off data is not shown in FIG.

Each channel memory area of the waveform control memory 11 is addressed by the channel number data CHNo from the timing generator 3.
One set of waveform control data groups in one channel memory area, that is, “0”, “1”, “2”, “3”, “4” in FIG.
The group of waveform control data in the vertical column is addressed by the count value from the repeat switching control unit 19.

Each waveform control data group in each channel memory area is written at the start of sound generation, rewritten or read out at each channel timing, and sent to the waveform reading section 12. The waveform control memory 11 may be provided in the program / data storage unit 4 or the controller 2 instead of in the tone signal generation unit 5.

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 disclosed 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.

Each waveform control data group is stored in the waveform readout unit 12.
And the read address data AD is generated in a time-division manner. This read address data AD is stored in the waveform memory 1
3, the tone waveform signal MW is read out in a time-division manner, and the cross-fade synthesis unit 14 weights and synthesizes each cross-fade section.

As shown in FIG. 10A, the waveform memory 13 stores one tone waveform signal MW having a plurality of different waveform shapes.
Wavelength or multiple wavelengths are stored. The switching selection of these tone waveform signals MW is based on the above musical factors. As described above, if the start address data SA and the EN address data EA are switched by the musical factor, the selection of the tone waveform signal MW is switched.

Further, the musical tone waveform signal MW is multiplied by the envelope data EN (envelope waveform) from the envelope generator 18 in the multiplier 15, and the musical tone waveform signal MW of each channel is accumulated and synthesized in the channel accumulating section 16, and The sound is output from the sound system 6.
The crossfade synthesizing section 14 and the repeat switching control section 19 are controlled based on data from the crossfade control section 20.

The envelope generator 18 also performs time division processing to generate envelope data EN for each channel. One musical tone waveform signal MW is multiplied and synthesized by one envelope data EN and output as one musical tone. The envelope generator 18 performs an envelope calculation based on the envelope speed data and the envelope level data. This calculation is performed for each envelope phase EF to form an envelope phase such as attack, decay, sustain, release, etc., and data indicating this phase is output as envelope phase data EF.

4. Waveform Readout Unit 12 FIG. 7 shows the waveform readout unit 12. The start address data SA and the harmonic data HL from the waveform control memory 11 are added and synthesized by an adder 23, and
4. In the loop of the adder 25 and the read address memory 26, the frequency number data FN is repeatedly added and accumulated, and is supplied to the waveform memory 13 as read address data AD. The read address memory 26 has a memory area corresponding to twice the number of channels, and each area has the channel number data CHN.
o and the clock signal φ. One cycle of the clock signal φ is equal to one channel time of the time division channel.

As a result, as shown in FIG. 3, the tone waveform signal MW is read from a position shifted from the start address SA by the harmonic HL. This shift in the degree of harmony HL is a shift in the (initial) phase of the tone waveform signal MW. FIG. 3 (B
1) As shown in (B2) and (B3), the harmonic data H
When the size of L is changed, FIG. 3 (C1) (C2) (C
As shown in 3), the phase of the tone waveform signal MW is also shifted.
The reading speed of the musical tone waveform signal MW depends on the frequency number data FN, that is, the pitch.

The read address data AD and the end address data EA from the waveform control memory 11 are sent to the comparator 27.
When D becomes equal to or exceeds the end address data EA, an end address detection signal is output, and the AND gate group 28 is opened. The read address data AD is inverted plus / minus by the inverter group 29 and sent to the adder 23 through the AND gate group 28. As a result, the excess fraction when the read address AD exceeds the end address EA is corrected.

This end address detection signal is supplied to the selector 24 via the OR gate 30 as a selection switching signal. An on-event signal is also supplied via this OR gate 30 as a selection switching signal. As a result, the read address data AD is reset to the initial address value from the adder 23 at the start of sound generation and when the end address EA is reached.

The read address data AD and the read start address SA + HL from the adder 23 are sent to the comparator 46, and the read address data AD
Is equal to the read start address SA + HL, a one-wavelength detection signal is output. The adder 23 is actually divided into two parts. The first adder determines the read start address SA + HL, and the second adder determines the fraction SA + HL-AD of the return address.

5. Crossfade Control Unit 20 FIG. 8 shows the crossfade control unit 20. The one-wavelength detection signal from the waveform reading unit 12 is input to the repeat counter 31 and incremented, that is, +1. The number-of-repeats counter 31 counts the number of repetitive readings of one tone waveform signal MW from the start address SA to the end address EA. The repeat number counter 31 is provided with a counter corresponding to the number of time-division channels. Only the counter designated by the channel number data CHNo is enabled, and only the designated counter is incremented or reset. .

The cross-fade count data CN from the waveform control memory 11 is plus / minus inverted by an inverter group 33 and sent to an adder 32. The repeat number data RN from the waveform control memory 11 is
, The cross-fade number data CN is subtracted and supplied to the comparator 34. The comparator 34 has a repeat count value RC from the repeat number counter 31.
When the repeat count value RC becomes equal to or exceeds the data RN-CN from the adder 32, a cross-fade start detection signal is output. This crossfade start detection signal is sent to the repeat counter 31 as a reset signal.

FIG. 5 shows the detection state of the crossfade start. The head of the crossfade section is a point where the crossfade number data CN is subtracted from the repeat number data RN. This point is the end of (1) in FIG. 5, that is, the beginning of (2). To this point the tone waveform signal MW
Is reproduced by the comparator 34.

The repeat count value RC and the cross-fade number data CN are sent to a divider 35, where an increase weighting ratio RC / CN is obtained. This increased weighting ratio R
The C / CN is input to the multiplier 44 of the crossfade synthesizing unit 14 via the selectors 36 and 37, and is multiplied and synthesized with the tone waveform signal MW. Thereby, the weight of the tone waveform signal MW is gradually increased as shown by MW1 in FIG. 5 (2).

The increasing weighting ratio RC / CN is
Through the inverter group 39 and the adder 40, the reduction weighting ratio (1-RC / CN) is obtained. The reduced weighting ratio (1-RC / CN) is also input to the multiplier 44 of the crossfade synthesizing unit 14 via the selectors 36 and 37, and is multiplied and synthesized with the musical tone waveform signal MW.
As a result, the weight of the tone waveform signal MW is gradually reduced as shown by MW2 in FIG.

The two tone waveform signals MW weighted by the increase weight and the decrease weight are accumulated (added) by the crossfade accumulator 45 of the crossfade synthesizer 14 and sent to the multiplier 15. The cross-fade accumulator 45 performs a cumulative calculation for each cycle of the clock signal φ, and selection of the selector 36 is switched by the clock signal φ. One cycle of the clock signal φ is equal to one channel time of the time division channel.

The repeat count value RC and the clock count data CN are sent to the comparator 42. If the repeat count value RC becomes equal to or exceeds the clock count data CN, a cross-fade end detection signal is output. The cross-fade end detection signal is sent to the selector 37 via the OR gate 43, and the data of level "1" is switched and selected and sent to the multiplier 44 of the cross-fade synthesizer 14. Thereby, as shown in FIG. 5 (3), the cross-fade section ends, and the weighting ends.

Due to such a cross-fade, at the joint between two tone waveform signals MW whose phases are shifted,
There is no discontinuity from one side to the other, and the timbre changes smoothly. In this case, the frequency spectrum characteristic shown in FIG. 4 does not change abruptly at the joint of the musical tone waveform signals MW, but changes gradually.

An on-event signal is sent to the selector 37 via the OR gate 43. Therefore, as shown at the beginning of the weighted synthesized waveform in FIG. 4, at the start of sound generation, cross-fade, that is, weighted synthesis is not performed.

6. FIG. 9 shows the repeat switching control unit 19 described above. The crossfade start detection signal is input to the repeat switching counter 47 and incremented, that is, +1. The repeat switching counter 47 counts the number of executions of a repeat section from the beginning in one musical tone shown in FIG. The repeat section at the time of the first ON event is not counted. The repeat switching counter 47 is provided with a counter corresponding to the number of time-division channels. Only the counter designated by the channel number data CHNo is enabled, and only the designated counter is incremented or reset. .

The repeat switching counter 47 is reset by an on-event signal output from the performance information generator 1 at the time of an on-event. Each bit data of the section count value ZC of the repeat switching counter 47 is output via the NAND gate 48 as the on-event signal. The on-event signal is at a high level when the section count value ZC is "0", and is at a high level from the start of sound generation to the beginning of the first crossfade section as shown in FIG.

The section count value ZC is sent as a read address to the waveform control memory 11 via the selector 49 together with the channel count data CHNo. The section count value ZC is calculated by the adder 50 as −
1 through the selector 49 and the waveform control memory 1
1 together with the channel count data CHNo as a read address. The clock signal φ is supplied to the selector 49 via the OR gate 51 as a selection switching signal.

Thus, when one set of waveform control data of a certain repeat section is read out in one channel time, one set of waveform control data of the immediately preceding repeat section is also read out in a time-division manner. The tone waveform signals MW of the two repeat sections are cross-fade, that is, weighted and synthesized.

When the cross fade section ends,
Since the cross-fade end detection signal is supplied to the selector 49 via the OR gate 51, the waveform control data in the two repeat sections is not read out in parallel. Further, since the repeat switching counter 7 is incremented at the beginning of the crossfade section, the waveform control data that has been read in the first half of one channel time at this time is switched so as to be read in the second half of the same channel time. .

The repeat count data RN in the last repeat section of each set of waveform control data is set to the maximum possible value, and the cross fade count data CN is set to "0". As a result, the last repeat section does not end before the tone is silenced or before the envelope release ends. The last repeat section is continued until the end of sound generation.

Further, the selector 49 may be supplied with envelope phase data EF from the envelope generator 18 instead of the section count value ZC from the repeat switching counter 47. Thus, each envelope phase (attack, decay, sustain, release) matches each repeat section.

7. FIG. 4 shows the change of the (initial) phase of the tone waveform signal MW read in each repeat section. If the tone waveform signal MW stored in the waveform memory 13 has a sine waveform as shown in FIG. 3, the frequency characteristics (spectral envelope, frequency spectrum component, formant shape) are as shown in FIG.
It is represented by a single simple spectrum as shown in (1a). On the other hand, if the (initial) phase of the read musical tone waveform signal MW increases due to the harmonic data HL, the harmonic component increases and the frequency spectrum component becomes (1b) (1
It changes as shown in c).

A sine wave whose phase is shifted with respect to a sine wave whose phase is not shifted as shown in FIG. 3 is obtained by combining a sine wave whose phase is not shifted with another sine wave having a small amplitude. Therefore, the timbre can be changed by changing the harmonic components of the generated musical tone only by changing the phase of such one musical tone waveform. This applies to waveforms other than sine waves and complicated waveforms.

The frequency of the sine wave having another small amplitude to be synthesized can be an integral multiple or a non-integer multiple of the frequency of the sine wave having no phase shift.
If it is an integer multiple, the degree of harmony is high, and if it is a non-integer multiple, the degree of harmony is low. The harmonic data H for determining the phase shift
The degree of harmony can be controlled by the value of L. The harmony data HL represents the harmony of the changing timbre in one musical tone. The value of the harmony degree data HL is changed according to the musical factor as described above.

FIG. 10A shows a tone waveform signal MW other than a sine wave. Even in such a musical tone waveform, tone color change and harmony control can be performed by controlling the phase.
Also, the start address SA and the end address EA
Is switched for each repeat section, so that FIG.
As shown in (1), the tone waveform signal MW in each repeat section in one tone can be switched.

FIG. 11 shows an example in which the length of the repeat section and the length of the cross-fade section match. In this case, the waveform control table 41 and the waveform control memory 11
And the cross-fade number data CN coincide with each other. In this case, the selector 37 in FIG.
The OR gate 43, the comparator 42, and the OR gate 51 in FIG. 9 can be omitted. In the example shown in FIG. 4, the length of the repeat section is longer than the length of the cross fade section.

8. FIG. 12 shows a flowchart of the entire processing executed by the controller (CPU) 2. 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 4 are performed (step 0).
1) If an on-event (key-on event, sounding event) is generated 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 1 (step 02), the sounding process is performed. (Step 03).

In this tone generation process, an empty channel is searched, and a tone related to the ON event is assigned to the searched empty channel. The contents of the musical tones are the above-mentioned performance information (musical tone generation information) from the performance information generating section 1,
It is determined by the musical factor information of the musical tone control information and the musical factor information already stored in the program / data storage unit 4 at this time.

In this case, the on / off data of "1", the frequency number data FN, the start address data SA, the end address data EA, the harmony degree data HL,
Repeat count data RN, crossfade count data C
N, other touch data TC, part number data P
N, the tone time data TM of "0", the envelope speed ES, the envelope level EL, the envelope phase EF of "0", and the like are written.

Next, if an off event (key-off event, mute event) is generated based on a manual performance or an automatic performance by the sounding instruction device or the automatic performance device of the performance information generating section 1 (step 04), the mute ( Attenuation) processing is performed (step 05). In this mute (attenuation) process, a channel to which a tone related to an off event (key-off event, mute 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 1 are operated, musical factor information corresponding to the switches is fetched, and the program / data storage section 4 is operated.
The musical factor information is changed (step 06). Thereafter, other processes are executed (Step 07), and the processes from Step 02 to Step 07 are repeated.

9. FIG. 13 shows a flowchart of the tone waveform signal MW reading process in the tone generation process 03. This flowchart is a second embodiment. First, the frequency number data FN is determined according to the input pitch, and the start address data SA, the end address data EA, the harmony data HL, the repeat number data RN, and the cross fade number data according to the input musical factors. The CN is read from the waveform control table 41 and written in the corresponding channel area of the waveform control memory 11. The read address data AD is set to the start address SA + harmonicity HL, the repeat count value RC, the section count value Z
C, the channel number data CHNo is reset to "0" (step 11).

Next, the tone waveform signals MW from the start address SA to the end address EA according to the section count value ZC are sequentially read (steps 12 and 13).
When the data is read up to the end address EA (Step 1)
4) The read address data AD is reset to the start address SA + harmonicity HL (step 15).

When the data is read to the read start position SA + HL (step 16), the repeat count value R
C is incremented by 1 (step 17). Further, when the repeat count value RC reaches the repeat number data RN (Step 18), the repeat count value RC is cleared (Step 19), and the section count value ZC is incremented by 1 (Step 20).

The above processing of steps 12 to 19 is executed by switching for each channel (steps 21 to 2).
3). In this process, a cross-fade process may be performed. In this case, the repeat count value RC is RN-CN
To RN, two tone waveform signals MW are read out in parallel in the same manner as in steps 12 and 13, and the increase weight ratio (RC / CN) and the decrease weight ratio (1-R) are respectively obtained.
C / CN), and are added and synthesized and output. This crossfade processing is executed after the above-mentioned step 19.

10. Processing of Tone Time Data TM and Number of Simultaneous Sounds FIG. 14 is a flowchart of an interrupt processing executed by the controller 2 at regular intervals. In this process, the tone time data TM is incremented and the number of simultaneous sounds is counted.

In this processing, each channel area of the waveform control memory 11 is processed (steps 41, 46, 4).
7) For tone data whose on / off data is "1" and a tone is being produced (step 43), the tone time data T
M is incremented by "+1" (step 44).

Similarly, for each channel area of the waveform control memory 11 (steps 41, 46, 47), after the data of the number of tones is cleared once (step 4).
2) Count those whose on / off data is "1" and a tone is sounding (step 43), and the number of simultaneous sounds is "+"
"1" is performed (step 45).

Then, other periodic processing is performed (step 48). In this way, the elapsed sounding time of the musical tones of each channel is counted and stored and used as the above-mentioned sounding time information. The number of musical tones during the sounding of all the channels at that time is counted and stored and used as the above-mentioned simultaneous sounding number information. .

The present invention is not limited to the above embodiment, but can be variously modified without departing from the spirit of the present invention. For example, the tone waveform signal MW may be sent from the outside or may be generated by calculation. In this case, the instantaneous value of the waveform is calculated and output based on the arithmetic expression representing the sine wave, the triangular wave, and other waveforms. At the start of the calculation, the harmony degree data HL is corrected.

The waveform memory 13 stores a plurality of tone waveform signals MW having the same waveform and sequentially shifted phases.
By sequentially switching the start address SA, the tone waveform signal MW having a phase shift may be reproduced in each repeat section.

Further, two or more tone signal generators 5 may be provided, and the tone waveform signals MW generated from each tone signal generator 5 may be cross-fade, that is, weighted and synthesized. The value of the cross-fade number data CN may be longer than the repeat number data RN. That is, the crossfade section may be longer than the repeat section.
In this case, more than two tone waveform signals MW are read out in parallel and weighted, that is, cross-fade. Note that the crossfade need not be performed.

The present invention can be implemented in an electronic musical instrument or a computer. 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).

(1) A tone waveform signal is repeatedly generated,
By changing the phase of the repetitively generated musical sound waveform signal,
A medium storing a computer program for generating a musical tone for causing a computer to at least execute switching and outputting the musical tone waveform signal of which phase is changed from the repetitively generated musical tone waveform signal in one musical tone. / Communication method of computer program / Musical sound generation device (method).

[0085]

As described above in detail, in the present invention, the phase of a tone waveform signal that is repeatedly generated is changed, and the tone waveform signal whose phase is changed is repeatedly generated in one tone. The tone waveform signal was switched and output continuously. Therefore, by changing the phase of the tone waveform signal in one tone, the timbre changes, and the timbre can be changed without changing the shape of the tone waveform signal. The timbre changes due to the phase change because the frequency characteristics (spectrum envelope (envelope), frequency spectrum component, formant shape) change even if the tone waveform signals having the same waveform shape have different phases.

[Brief description of the drawings]

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

FIG. 2 is a waveform control table 41 and a waveform control memory 11;
Is shown.

FIG. 3 shows a read state in which the phase of the musical tone waveform signal MW is shifted.

FIG. 4 shows the mutual relationship of each tone waveform signal MW out of phase in one tone.

FIG. 5 shows weighting synthesis, that is, cross-fading at a joint between two tone waveform signals MW having different phases.

FIG. 6 shows a tone signal generator 5;

FIG. 7 shows a waveform reading section 12 in the musical sound signal generating section 5.

FIG. 8 shows a crossfade controller 20 in the tone signal generator 5;

FIG. 9 shows a repeat switching control section 19 in the tone signal generating section 5;

FIG. 10 shows musical tone waveform signals MW having different waveform shapes stored in the waveform memory 13 and a reproduction state thereof.

FIG. 11 shows a reproduction state of the tone waveform signal MW when the length of the repeat section is equal to the length of the cross fade section.

FIG. 12 shows a flowchart of the entire processing.

FIG. 13 shows a flowchart of reading out a musical tone waveform signal MW.

FIG. 14 shows a flowchart of an interrupt process.

[Explanation of symbols]

1 ... performance information generating unit, 2 ... controller (CPU), 3
... timing generator, 4 ... program / data storage,
415: musical tone signal generator, 6: sound system, 7:
Information storage unit, 11: Waveform control memory, 12: Waveform readout unit, 13: Waveform memory, 14: Crossfade synthesis unit, 18: Envelope generator, 19: Repeat switching control unit, 20: Crossfade control unit, 26 ...
Read address memory, 27, 34, 42, 46 comparator, 31 repeat counter, 47 repeat switch counter, 35 divider, 41 waveform control table.

Claims (4)

[Claims] 1. A musical tone waveform signal that is repeatedly generated, a phase of the musical tone waveform signal that is repeatedly generated is changed, and the musical tone waveform signal whose phase is changed in one musical tone is repeatedly generated. A tone generator which switches from a waveform signal and outputs it continuously. 2. A musical sound waveform signal is repeatedly generated, the phase of the repeatedly generated musical sound waveform signal is changed, and in one musical sound, the musical sound waveform signal of which phase is changed is repeatedly generated. A tone generation method characterized by switching from a waveform signal and outputting continuously. 3. The tone waveform signal is stored in one or more wavelengths, and is repeatedly read out, and the phase is changed by changing the start position of the readout or generation. Each tone waveform signal whose phase is changed is repeated for a predetermined number of wavelengths, and this predetermined number can be set or changed. The amount of the phase change is determined by a musical factor, 2. The musical tone generating apparatus according to claim 1, wherein the tone waveform signal generated repeatedly has a waveform shape or a pitch changed in accordance with the repetition. 4. A tone waveform signal before switching when each tone waveform signal whose phase is changed is synthesized with one envelope and output, and when the tone waveform signal is switched to a tone waveform signal whose phase is changed. Is gradually reduced, the weight of the switched tone waveform signal is gradually increased, and the weighted tone waveform signals are combined and output. The length of the weighting and combining section can be set or changed. 4. The tone generating apparatus according to claim 1, wherein the length of the section for weighting and combining and the length of a repetition section of each tone waveform signal whose phase is changed are the same or different. .