JPH11305775A - Key-on delay effect adding device for electronic musical instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To place a load on none of a microcontroller, a sound source, etc., to secure as many sound generation channels as possible, and to reduce the storage capacity that a waveform memory needs to have. SOLUTION: This device has a control means 1, a waveform storage means 2 for musical sound waveforms, a musical sound signal generating means 3 which reads musical sound waveform data out of the waveform storage means 2 and gives an envelope to the waveform data to generate a musical sound signal, and a musical sound generating means 4 based upon generated musical sound signals by the musical sound generation channels. The control means 1 transfers as control parameters an envelope coefficient having a phase wherein an envelope value can be set to nearly zero and a waveform read address equivalent to a time equal to the envelope phase to the musical sound generating means 3 by the musical sound generation channels.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a key-on delay effect adding device for an electronic musical instrument.

[0002]

2. Description of the Related Art As one method for obtaining a so-called ensemble effect capable of producing musical sounds as if performing ensemble,
There is a process called key-on delay. In this key-on delay processing, normally, a tone having the same pitch and timbre is generated in two streams, and the tone of one stream at this time is generated later than the tone of the other stream, so that both streams are generated. In this case, the transfer of the musical sound waveforms of the two series is made different to produce the effect of the ensemble by making the transfer of the musical sound waveforms of the two series different.
No. 81795).

As one of such configurations, in the configuration disclosed in Japanese Patent Application Laid-Open No. Hei 2-181595, a microcontroller counts the delay time for each tone generation channel, and generates a waveform for starting sound generation at different timings. A control parameter including a read address and an envelope coefficient is transmitted to obtain a key-on delay effect.

As a configuration for obtaining the same effect,
In the configuration disclosed in JP-A-5-216479, the microcontroller activates a plurality of tone generation channels at once, shifts the respective waveform read addresses, and sets the read waveform corresponding to the delay time as the read waveform corresponding to the delay time. By storing zero, a key-on delay effect is obtained.

[0005]

Problems to be Solved by the Invention
In the configuration of No. 5, a tone generation system such as a tone generator LSI for generating a tone is not loaded and a simple configuration is required. However, a load is imposed on a microcontroller, and even if a high-speed type is used, the tone is generated. There is a problem that the number of musical tone generating channels that can be generated is limited.

In the configuration of Japanese Patent Application Laid-Open No. Hei 5-216479, no load is applied to the microcontroller and the tone generator LSI, but the storage capacity required for the waveform memory for storing the waveform data increases. In addition, it leads to high costs.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and includes a microcontroller and a sound source LS.
A key-on-delay effect adding device for an electronic musical instrument which does not impose a load on I and the like, thereby ensuring as many musical tone generation channels as possible, and requiring only a small storage capacity for the waveform memory. Things.

[0008]

Therefore, a key-on delay effect adding device for an electronic musical instrument according to the present invention has a structure in which a plurality of tone generation channels are controlled based on one key-on information, including a waveform read address and an envelope coefficient. Control means for simultaneously transferring parameters, waveform storage means for storing an arbitrary tone waveform, and tone waveform data from the waveform storage means based on control parameters transferred from the control means and allocated to a plurality of tone generation channels. And a tone signal generating means for generating a tone signal by applying an envelope to the waveform data, and generating a tone based on the tone signal generated for each tone generating channel by the tone signal generating means. At least musical tone generating means, wherein the control means includes an envelope as a control parameter. An envelope coefficient capable of forming an envelope having a phase whose value can be set to substantially 0, and a waveform readout using a start address that is an address retroactive from the top of an original readout waveform by an amount equivalent to a time equivalent to the envelope phase. The basic feature is that the address is transferred to the tone signal generating means for each tone generating channel.

In the above configuration, the control means transfers the envelope coefficient to the tone signal generating means for each tone generating channel, and increases the phase of the envelope generated by one from that of the prior art.
hase is provided. If the envelope value of the pre-read phase is set to be approximately 0, the waveform data read during that period will have the above-mentioned envelope value (approximately 0).
As a result, the output is substantially zero.
Also, during the pre-read phase, it is just equivalent to the delay time, so that the tone waveform to be multiplied by the envelope value also has an address that goes back from the top of the original read waveform by an amount equivalent to the time equivalent to the envelope phase. Is read as a start address, any tone waveform data read out during the pre-read phase is output as approximately 0 by the above multiplication.
Thus, the delay time can be set for the musical tone waveform without storing zero in the readout waveform corresponding to the delay time as in the signal. In addition, there is no need to set a delay time by a control means such as a CPU, and the load is reduced accordingly.

[0010]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a block diagram of an electronic musical instrument to which a configuration of an embodiment of a key-on delay effect adding apparatus according to the present invention is applied. This electronic musical instrument reads predetermined waveform data according to a selected timbre and emits sound. This is an electronic musical instrument of a waveform memory reading system.

This configuration comprises a control unit 1 and a waveform storage unit 2
And a tone signal generating means 3 and a tone generating means 4. These components are connected to the bus 100 and are incorporated as components of the electronic musical instrument. Further, a configuration required as a configuration of the electronic musical instrument is connected to the bus 100. That is, the keyboard interface 1
01a via the panel interface 102a and the panel switch 102 via the panel interface 102a.
M103 and ROM 104 are connected to the bus 100. In addition, a MIDI interface 105 and a disk drive 106 are connected to the bus 100.

The keyboard interface 101a is a keyboard 1
By scanning 01, each event of key press (key on) and key release (key off) is detected, and the key code of the key having the event is output.

The panel switch 102 includes a tone selection switch for selecting a desired tone from a plurality of types of tone and other switches. The panel interface 102a detects an event of each switch operation of the panel switch 102.

The RAM 103 temporarily stores data necessary for executing a program, and functions as a working memory.

The ROM 104 stores tone color data for specifying a tone color, address information for specifying a read address of waveform data, an envelope coefficient for generating an envelope waveform, a control program, and the like in the tone signal generating means 3. The control unit 1 exchanges various kinds of information via the bus 100 and controls the operation of the entire electronic musical instrument based on a control program in the ROM 103 using registers and the like set in the RAM 103.

The control means 1 is constituted by a CPU for performing overall control and arithmetic processing. In this configuration, when the key-on delay assigner mode is activated, the key-on delay effect adding device functions. Based on one key-on information, control parameters including a waveform read address and an envelope coefficient are assigned to 64 tone generation channels.
Plays the function of transferring at the same time.

The waveform storage means 2 is composed of a ROM, and as shown in FIG. 2, waveform data consisting of time-series amplitude information obtained by sampling a musical tone waveform is stored in succession for a plurality of types of musical tones. It is stored continuously. FIG.
Shows the relationship between the stored contents of the waveform ROM and the read address, and the strings, strings,
There are organs, pianos, etc.
It consists of a head part and a loop part. A, B, and C indicate read start addresses, LT indicates a loop top address, and LE indicates a loop end address.

The tone signal generating means 3 is composed of a sound source LSI capable of simultaneously generating 64 sounds by time division multiplexing processing, and is transferred from the control means 1 to the assignment memory 30 for 64 channels via the bus. Based on the control parameters assigned to the tone generation channels, the tone waveform data is read from the waveform storage means 2 and an envelope is added to the waveform data to generate a digital tone signal. The detailed configuration will be described later.

The tone generator 4 comprises a digital / analog converter 40 and a sound device 41 comprising an amplifier and a speaker. The digital tone signal output from the tone generator 3 is converted by the digital / analog converter 40 into a digital signal. / A conversion is performed, and a tone is generated by the sound device 41.

In this configuration, a digital signal processor DS is provided between the tone signal generating means 3 and the tone generating means 4.
P5 is provided, and various sound effects such as reverb can be applied to the digital musical tone signal based on the coefficient and the like sent by the control means 1.

As shown in FIG. 3, the tone signal generating means 3 comprises an assignment memory 30 for 64 channels,
A timing generator 31 for supplying a clock necessary for performing time-division processing, and an F-number accumulator 32 for generating a waveform read address for reading waveform data
A sampling interpolation filter 33 for performing an interpolation process on the waveform data read from the waveform storage means 2 and a filter process for adjusting harmonic components, and an envelope accumulator 34 for generating an envelope composed of a plurality of phases.
A first multiplier 35 for multiplying the read-out waveform subjected to the interpolation processing and the filter processing by an envelope, a second multiplier 36 for further multiplying the read-out waveform multiplied by the envelope by two's complement, And a sequence accumulator 37 for accumulating the resulting 64 channels of tone signals.

In the above configuration, the F-number accumulator 32 obtains the result of accumulating the F-number addition value (N) with respect to the start address in order to read out the waveform data stored in the waveform storage means 2. The calculated read-out accumulative value (FACC) is added to determine a waveform read address, and these are further generated in a time division manner for 64 channels. The integer part of the waveform read address is supplied to the waveform storage means 2, and the decimal part thereof is output to the sampling interpolation filter 33. The sampling interpolation filter 33 calculates a waveform sampling value corresponding to the decimal part of the waveform address based on the waveform data read from the waveform storage means 2 by interpolation, and further performs a filtering process for adjusting harmonic components. And output. The envelope accumulator 34 accumulates the speed data (SPD) (including the case of addition and subtraction) and obtains the envelope accumulate value (EACC) and the phase end value data (PEP), and increases or decreases the envelope. An amplitude envelope signal for 64 channels is generated in a time-sharing manner from − / + flag data (− / +) for determining whether to perform the processing. These SPD data, PEP data or-/ +
The flag data is a control parameter such as an envelope coefficient for generating an envelope waveform, which is read from the ROM 104 to the control means 1 and given. First multiplier 35
Multiplies the waveform sample value output from the sampling interpolation filter 33 by the amplitude envelope signal. Further, the second accumulator 36 further multiplies the read waveform multiplied by the envelope by the two's complement supplied from the assignment memory 30 so that the waveform output can be started by shifting the phase by 180 °. By doing so, a predetermined loudness can be obtained even if the relative amplitude is small (without requiring a large dynamic range).
The sequence accumulator 36 accumulates tone signals of 64 channels that are time-divisionally output, and synthesizes outputs of all channels.

The envelope accumulator 34 is a phase division type envelope generator. In this configuration, the envelope generated by the envelope accumulator 34 is converted into a p-value at the time of key-on.
4 phases from h0 to ph3, ph4 to ph at key-off
7 is also divided into four phases. As shown in FIG. 4, the assignment memory 30 includes, for each channel, an area for reading waveform data of the waveform storage unit 2, an area for envelope control, an area for loudness,
Control flags such as CC clear, ph clear, and EACC clear are divided into storage areas for filter coefficients and the like.

The area for reading the waveform data includes a start address (STa, STa) for reading the waveform data.
b, STc), an F-number addition value (N), a loop top address (LT), and a loop end address (LE) are stored. In the area for envelope control, the speed data (SPD), the phase end value data (PEP), and / or ph0 to ph3 at the time of key-on, and the phase end value data (PEP) at the phases of ph4 to ph7 at the time of key-off.
+ Flag data (− / +) is stored. In the loudness area, a value indicating how much the envelope loudness is applied is stored as a two's complement. In this configuration, by using the two's complement, a waveform having an opposite phase can be included, thereby increasing loudness without increasing the dynamic range. FACC clear, ph clear, EACC
The clearing is performed by setting the value to 1 by the control means 1, and when the musical sound signal generating means 3 recognizes the value, the register storing the FACC, the phase, and the EACC is cleared, and the FACC and the EACC become 0. And the phase is ph0.

Here, the speed data (S) in each phase stored in the envelope control area is set.
PD) and phase end value data (PEP) and-/ + flag data (-/) to determine whether the envelope rises (indicated by +) or decays (indicated by-).
+), And how the envelope waveform is generated from the relationship with the envelope accumulated value (EACC) which is the accumulated value of the SPD will be described below.

FIG. 5 (a) is an explanatory diagram showing these relationships. The operation in the envelope accumulator 34 is performed in accordance with the floating point, and the phase data of the envelope has an exponent part of 4 bits, The mantissa consists of 12 bits. SP
The D data is composed of 8 bits of a mantissa, and is added or subtracted according to the above-mentioned +/- signal. The EACC data consists of an exponent part of 4 bits and a mantissa part of 12 bits. When the − / + signal is 0,
That is, when "+", SPD data is added to the EACC data in a time slot time-divided for each channel. The PEP data corresponds to the upper 7 bits of the above EACC data, is composed of 4 bits for the exponent part and 3 bits for the mantissa part, and is compared with the upper 7 bits of the EACC data (4 bits for the exponent part and 3 bits for the mantissa part). . As a result of the comparison, if EACC data ≧ PEP data, the phase shifts from the current phase to the next phase. The above is the case where the − / + signal is “0”, that is, “+”. However, when the − / + signal is “1”, that is, “−”, the EAC
The SPD data is subtracted from the C data and the EAC
C data and PEP data are compared, and as a result of comparison, E
If ACC data ≦ PEP data, the phase shifts from the current phase to the next phase. The transition of this phase forms an envelope waveform. Also-
The SPD data is left-shifted so that the / + signal has an exponential shape on the linear axis when it is "1" and the linear shape when the-/ + signal is "0". As a result, FIG.
The shape is as shown in FIG.

These envelope parameters consist of four phases ph0 to ph3 when the key is on and four phases ph4 to ph7 when the key is off. When the clear becomes 1, as described above, the previous phase register is cleared, ph = 0, and p
The parameter of h0 or ph4 is adopted. The phase register of each channel is cleared by key-on by setting ph clear = 1 by the control means 1, but the contents of ph0 to ph3 are rewritten to the values of ph4 to ph7 which are the key-off phase also at key-off. After being cleared, and stored in the area corresponding to ph0.
Will be adopted.

In this configuration, the preread p of ph0 is increased by increasing the phase of the envelope by one.
a pre-read phase
In order to substantially create a delay time by e, the envelope value is set to substantially zero. In that case, the phase data of the envelope is Power
(Exponent) is represented by 2 ^P-16 and Mantissa (mantissa) is represented by 1 + M / 2 ^12.
In order to make the envelope value of phase substantially zero, p
The power of the PEP in the read phase may be set to P ≦ 8 in any of a plurality of channels for which sound generation should be started simultaneously. Assuming that the value of Mantissa is temporarily 0, the envelope value at the time of P = 8 is as shown in the following equation (1).

[0029]

## EQU1 ## Env = 2 ^P-16 * (1 + M / 2 ¹² ) = 2 ^-8 * (1 + 0) = 2 ^-8 = 48 db

This value is a very small value, and is a level that does not matter when the envelope rises. However, if the tone to be generated contains almost no harmonics like the flute sound and the rise is not too early, pr
The power of the PEP of the e read phase is P ≦
If it is 6, there is no problem in any case.

As described above, the pre read phas
Since e corresponds to the delay time, the tone waveform to be multiplied by the envelope value is also referred to as the start address from the top of the original readout waveform by the time equivalent to the time equivalent to the envelope phase. (The waveform read during that time is referred to as a pre-read waveform). Thereby, whatever the tone waveform data read during the preread phase,
By multiplying the envelope value by approximately 0 during the read phase, the output is output as approximately 0, and the delay time can be set for the musical sound waveform.

That is, the delay time is determined by the pre
Determined by the SPD data and PEP data of the read phase (EACC in which the SPD data is accumulated)
At the same time, as shown in FIG. 2, the reading speed of the waveform based on the key depression, that is, the F-number added value (N) and the pre-read waveform It is also determined by length, that is, start address (STa, STb, STc) to loop top address (LT),
In the present configuration, they must be equal.

For example, if the delay time is 10 ms,
If the system clock frequency of the envelope accumulator 34 is 4
0 KHz, that is, the operation cycle per channel is 2
Assuming that the time is 5 μs, it is necessary to set such that 400 operations are required from Equation 2 below in order for the EACC data of ph0 to reach the PEP data in 10 ms.

[0034]

## EQU2 ## 10 × 10 ³ μs ÷ 25 μs = 400 (times)

Referring to FIG. 5, the PEP data Po
wer = 6, Mantissa = 0, − / + = 0 (+)
If EACC = 6 × 2 ¹² , the phase transition point is reached. Therefore, as SPD data,
The value is obtained by dividing the value by the above-mentioned number of operations 400.

[0036]

[Equation 3] SPD = 6 × 2 ¹² ÷ 400

With such values, the calculation of ph0 is completed in about 10 ms, and thereafter, the process shifts to ph1, and the normal attack phase is started. The waveform level of the result of the multiplication by the first multiplier 35 that multiplies the waveform by the envelope also increases.

On the other hand, as described above, when reading out the waveform data, the F number added value (N) and the pre area
d In consideration of the length of the waveform, the waveform must be read by using the address which is retroactive from the top of the original read waveform for the delay time as the start address. In that case, the waveform R
FIG. 2 showing the relationship between the storage contents of the OM and the read address.
An example in which the ensemble effect of the piano shown in FIG. 6 is obtained will be described with reference to FIG.

FIG. 6 shows that, based on one key-on information, the control means 1 simultaneously transfers control parameters including a waveform read address and an envelope coefficient to three tone generation channels, and the tone signal generation means 3 Based on the control parameters allocated to each tone generation channel, a state in which the tone waveform data is read from the waveform storage means 2, a state in which an envelope waveform to be multiplied by the waveform data is generated, and FIG. 7 is an explanatory diagram of transition of waveform data indicating a state of a generated musical sound waveform in a time series. (A) at the top of the drawing shows the timing of key-on and key-off by a player's keyboard operation.
The following (b) shows the readout waveform, envelope waveform, and first multiplier of the piano in the tone generation channel TGch1, (c) shows the tone generation channel TGch2, and (d) shows the tone generation channel TGch3. 35 shows the transition of the waveform output.
The key-on / off timing shown in FIG. 7A is common to all channels, and the load on the control unit 1 is reduced.

In TGch1, the delay time of Delay0 is almost 0, and therefore, the reading of the waveform data of the piano is performed from the address A in FIG. Also, preread p of ph0 constituting the envelope waveform
occupancy time of the Hase (envelope value is almost 0) is also almost 0
Therefore, the operation shifts to the attack phase of ph1 almost simultaneously with the key-on. Also, the key-off shifts to the release phase of ph4. The multiplied output of the read waveform and the envelope waveform is as shown in the drawing, and a musical tone is generated simultaneously with key-on.

In TGch2, there is a delay time of Delay1, and therefore, the reading of the piano waveform data is performed from the address B in FIG. Also, a pre-read phase of ph0 constituting the envelope waveform
The occupation time of (envelope value is almost 0) is also the same as the delay time of Delay1, so that the delay shifts from the key-on to the attack phase of ph1. At the same time as the key-off, the process shifts to the release phase of ph4. The multiplied output of the read waveform and the envelope waveform is as shown in the drawing, and a tone is generated with a delay of the delay time from key-on.

In TGch3, there is a delay time of Delay2. Therefore, the reading of the waveform data of the piano is performed from the address C in FIG. Also, a pre-read phase of ph0 constituting the envelope waveform
The occupation time of (envelope value is almost 0) is also the same as the delay time of Delay2, so that the delay time elapses from key-on and shifts to the attack phase of ph1. At the same time as the key-off, the process shifts to the release phase of ph4. The multiplied output of the read waveform and the envelope waveform is as shown in the drawing, and a tone is generated with a delay of the delay time from key-on.

In order to make the transition of the waveform data as described above, the SPD data of the pre-read phase of ph0 must be different among the tone generation channels of TGch1 to TGch3. Ph0 pre
It is necessary for the PEP, which is the target value of the read phase, to have a value that allows the envelope value of the phase to be substantially zero. In this configuration, the PEP POW
As described above, the value of ER is set to 8 or less.

FIGS. 7 and 8 are flowcharts showing the processing flow by the control means 1 when the processing according to the present configuration is performed. When the power switch is turned on, the bus 10
0, the control means 1, the tone signal generation means 3,
The tone generator 4, the keyboard interface 101a, the panel interface 102a, and the RAM 103 are initialized (step S101). At this time, the assigner mode is changed to the normal assigner mode (ASN =
Normal), all assignment memories 30 are cleared, and programs and necessary coefficients are transferred to the DSP 5.

Next, an ON event of the panel switch is detected (step S102), and the ensemble is turned ON therein.
It is detected whether or not there is an event (step S1).
03). If an ensemble ON event is detected (step S103; Yes), the assignment memory 3
0 corresponding channel area is cleared (step S10).
4) Activate the key-on delay assigner mode by operating the key-on delay effect adding device of the present invention (step S105). If the ensemble ON event is not detected (step S103; N
o), it is detected whether or not there is an ensemble OFF event (step S106). Ensemble OFF
When an event is detected (step S106; Ye
s), the corresponding channel area of the assignment memory 30 is cleared (step S107), and the normal assigner mode is activated (step S108). When no ensemble OFF event is detected (step S1
06; No), a process corresponding to other panel switches is performed (step S109).

Step S105, 108 or 109
Thereafter, the keyboard data and MIDI data are stored in the key input buffer (step S110). Then, a key-on event of the keyboard 101 is detected (step S11).
1) If this key-on event is detected (step S111; Yes), one of the tone generation channels is determined (TGch0), and the start address shown in FIG. STa, F number added value (N), loop top address (LT), loop end address (LE), ph0
Speed data (SPD), phase end value data (PEP) and − / + flag data (− /
+), FACC clear = 1, ph clear = 1, E
A control flag such as ACC clear = 1 and a filter coefficient are written (step S112).

Further, it is checked whether the assigner mode is a key-on delay (step S113). If the key-on delay is a key-on delay (step S113; Yes), two tone generating channels other than the above-mentioned channel (TGch0) are determined (TGch1, TGch2). ), The above-mentioned parameters other than the start address STa, the SPD data of the envelope ph0, and the filter coefficient are copied to the corresponding assignment memories 30 of those channels, and the start address STb, the SPD data of the envelope ph0, the filter coefficient And T
Gch2 has a start address STc and an envelope p
The SPD data of h0 and the filter coefficient are obtained by calculation and written respectively (step S114). In step S113, if it is not a key-on delay (step S113).
113; No), and proceeds to FD interface control described later (step S119).

On the other hand, if the key-on event is not detected (step S111; No), a key-off event of the keyboard 101 is detected (step S115). When this key-off event is detected (step S11)
5; Yes), the key-off phase p shown in FIG. 4 is stored in the assignment memory 30 of the corresponding tone generation channel.
Speed data (SPD), phase end value data (PEP) and − / + flag data (−
/ +), And further writes ph clear = 1 (step S)
116).

Further, it is checked whether or not the assigner mode is the key-on delay (step S117). If it is the key-on delay (step S117; Yes), two tone generating channels other than the above-mentioned channel (TGch0) are detected (TGch1, TGch1). TGch2), the speed data (S) for the key-off phases ph4 to ph7 are stored in the assignment memories 30 corresponding to those channels.
PD), phase end value data (PEP), − / + flag data (− / +), and ph clear = 1 are written (step S118). In step S117, if it is not a key-on delay (step S117; N
o), the process proceeds to FD interface control described later (step S119).

In addition, if the key-off event is not detected in the detection of the key-off event in step S115 (step S115; No), if it is not the key-on delay in step S113 (step S113; No), step S1 is performed.
17 is not a key-on delay (step S11
7; No), and further steps S114 and S11
After writing 8, the process shifts to FD interface control (step S119), and finally returns to step S102.

In the configuration of the present embodiment described above, the envelope coefficient is transferred to the musical sound signal generating means 3 for each musical sound generating channel by the control means 1, and the phase of the envelope generated thereby is increased by one in comparison with the prior art.
An ead phase is provided. That pre read
Since the envelope value of the phase is set to approximately 0, the waveform data read during that period is output as approximately 0 as a result of being multiplied by the above-described envelope value (substantially 0).

Also, during the pre read phase,
The waveform corresponding to the delay time is multiplied by the envelope value, and the waveform is read with the start address as the start address from the top of the original read waveform by an amount equivalent to the time equivalent to the envelope phase. I have. Thereby, pre read ph
Whatever tone waveform data is read out during ase, the multiplication is output as substantially zero by the above multiplication, and even if zero is not stored in the readout waveform corresponding to the delay time as in JP-A-5-216479, The delay time can be set for the tone waveform. Further, it is not necessary to set the delay time by the control means 1 such as a CPU, and the load is reduced accordingly.

[0053]

According to the configuration of the key-on delay effect adding apparatus of the present invention described in detail above, a waveform memory having a small storage capacity is required, and a load is not applied to a microcontroller, a sound source LSI, etc., and as much as possible. , The number of musical tone generation channels can be ensured, and thereby, a key-on delay effect that can obtain a wonderful ensemble effect can be obtained.

[Brief description of the drawings]

FIG. 1 is a block diagram of an electronic musical instrument to which a configuration of an embodiment of a key-on delay effect adding device according to the present invention is applied.

FIG. 2 is an explanatory diagram showing a relationship between storage contents of a waveform ROM and read addresses.

FIG. 3 is a block diagram of an electronic musical instrument to which the configuration of the key-on delay effect adding device mainly showing a tone signal generating means is applied.

FIG. 4 is an explanatory diagram showing an example of the contents stored in an assignment memory.

FIG. 5 is an explanatory diagram showing a relationship between an envelope coefficient and what kind of envelope waveform is generated by the envelope coefficient.

FIG. 6 is an explanatory diagram showing transition of waveform data indicating a state in which musical tone waveform data is read from a waveform storage unit, a state in which an envelope waveform is generated, and a state of a musical tone waveform generated by multiplying these in a time series manner.

FIG. 7 is a flowchart illustrating a processing flow by a control unit when processing according to the present configuration is performed.

FIG. 8 is a flowchart showing a continuation of the processing flow by the control means.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 control means 2 waveform storage means 3 tone signal generation means 4 tone generation means 5 DSP 30 assignment memory 31 timing generator 32 F number accumulator 33 sampling interpolation filter 34 envelope accumulator 35 first multiplier 36 second Multiplier 37 Series accumulator 40 Digital / analog converter 41 Sound device 100 Bus 101 Keyboard 101a Keyboard interface 102 Panel switch 102a Panel interface 103 RAM 104 ROM 105 MIDI interface 106 Disk drive

Claims (3)

[Claims] 1. A control means for simultaneously transferring control parameters including a waveform read address and an envelope coefficient to a plurality of tone generation channels based on one key-on information, and a waveform storage means for storing an arbitrary tone waveform. Based on the control parameters transferred from the control means and allocated to a plurality of tone generation channels, the tone waveform data is read from the waveform storage means, and an envelope is added to the waveform data to generate a tone signal. A tone signal generating means for generating a tone based on a tone signal generated for each tone generating channel by the tone signal generating means, wherein the control means includes: An envelope capable of forming an envelope having a phase in which the envelope value can be set to approximately 0 Transfer to the tone signal generation means for each tone generation channel, the loop coefficient and a waveform read address starting from an address which is retroactive from the top of the original read waveform by an amount equivalent to the time equivalent to the envelope phase. A key-on delay effect adding device for an electronic musical instrument, characterized in that: 2. An envelope coefficient transferred by the control means to a plurality of tone generation channels can form one envelope by a plurality of divided phases, and at least the speed data of the first phase includes the tone data. 2. The key-on delay effect adding device for an electronic musical instrument according to claim 1, wherein the generation channels are different. 3. An envelope coefficient transferred by the control means to a plurality of tone generation channels can form one envelope by a plurality of divided phases, and is a target value of at least the first phase. P
3. The key-on delay effect adding device for an electronic musical instrument according to claim 1, wherein the envelope value of the envelope phase in the EP is set to a value that can be set to substantially zero.