JPH0546957B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention provides two
The present invention relates to an electronic musical instrument in which different types of waveforms are prepared in a waveform memory, and readout waveforms from both memories are interpolated and synthesized at a ratio according to a timbre change parameter.

[Conventional technology]

The entire waveform from the start to the end of the sound, or the entire waveform at the rising edge and part of the subsequent waveforms are stored in the waveform memory, and if the former is stored, the entire waveform can be read out in one go to create a high-quality musical waveform signal. Recently, when the latter is stored, a high-quality musical waveform signal can be generated by reading out the entire waveform of the rising part and then repeatedly reading out part of the waveform after that ( Japanese Unexamined Patent Publication 1972-
No. 121313). Although this method of storing multi-cycle continuous waveforms in advance in the waveform memory can provide high-quality musical waveform signals, it requires a huge amount of memory capacity, so it is possible to It was unsuitable for realizing significant timbre changes.
In other words, key scaling control that changes the timbre according to the pitch and range of the musical sound to be generated, touch response control that changes the timbre according to the operation state of the performance keys (operation speed, operation strength), and various controls. (e.g. soft pedals and brilliance controls)
If you want to perform operator control that changes the tone depending on the operating state of the controller, the simplest way is to provide multiple waveform memories for each control content and select and read out one of them. Yes, but
This has the disadvantage that the configuration becomes complicated and at the same time the capacity of the waveform memory becomes enormous.

[Problem that the invention seeks to solve]

This invention attempts to solve the problems of complicating the configuration when performing tone change control such as key scaling control, and the problem of the waveform memory having an enormous capacity. The present invention aims to provide an electronic musical instrument that can apply timbre changes such as key scaling control using a capacitive waveform memory configuration.

[Means for solving problems]

A waveform memory that stores waveform data of the entire waveform from the start of the sound to the end, or a part of it, continuous or discrete waveforms of multiple frequencies, is stored in two types of waveforms (first waveform and second waveform). ), and a synthesis processing means for synthesizing the first and second waveform signals obtained based on the readout outputs of both waveform memories at a ratio according to the timbre change parameter. This timbre change parameter is based on a first parameter for independently controlling timbre change for each musical tone to be generated, and a second parameter for controlling timbre change commonly for each musical tone to be generated. Set. Here, the second waveform corresponds to a difference waveform between the first waveform and the desired waveform. The synthesis processing means includes means for generating a filter characteristic parameter according to the timbre change parameter, a digital filter that controls the second waveform signal with a characteristic according to the filter characteristic parameter, and a digital filter that controls the second waveform signal according to the filter characteristic parameter. means for controlling the level of the second waveform signal to be controlled or that has been controlled according to a level coefficient according to the timbre change parameter; and calculation means for adding or subtracting the two waveform signals.

[Effect]

By interpolating and synthesizing two types of waveform signals based on the readout outputs of two waveform memories at a ratio according to the timbre change parameter, a musical waveform signal showing a desired timbre change according to the timbre change parameter is obtained. In this case, the timbre change parameter is set based on both the first parameter and the second parameter, so both an independent timbre change for each musical tone to be generated and a timbre change for each musical tone are applied to the musical tone signal. can do. Furthermore, since the second waveform is a differential waveform of the first waveform with respect to the desired waveform, its storage capacity can be reduced. Moreover, since a digital filter is provided that controls the second waveform signal with characteristics according to the filter characteristic parameter corresponding to the timbre change parameter, the second waveform signal can be further changed and controlled in accordance with the timbre change parameter. This makes it possible to realize even more complex timbre change control and to smooth out the waveform corresponding to the error.

As an example, the first parameter corresponds to a key touch, in which case a timbre change (that is, timbre touch control) corresponding to each key touch is realized for each key press.

As another example, the first parameter corresponds to the pitch or range of the musical tone (key pressed) to be generated, in which case the timbre changes depending on the pitch or range for each key pressed. (In other words, timbre key scaling) is realized.

Further, as an example, the second parameter corresponds to the operation image of the soft pedal operator,
In that case, the timbre change of each musical tone is commonly controlled according to the pedal operation state. The soft pedal operator is used to control the control amount in the touch control.

As another example, it corresponds to the operation state of the brilliance operator of the second parameter, and in that case as well, the timbre change of each school tone is commonly controlled according to the state of this operator.

According to an embodiment of the present invention, in order to prevent the phases of the first and second waveforms stored in the two waveform memories from being too much different and to ensure interpolation synthesis, the following advance preparation is performed. Create first and second waveforms by waveform processing, and
are stored in the respective waveform memories. (1) Prepare two types of original waveforms consisting of multiple cycles produced by the same type of natural instrument with mutually different timbre and volume characteristics.
(2) By manipulating the phase of the prepared original waveform, the phase is corrected in the direction of reducing the mutual phase shift so that the mutual phase relationship does not deviate too much, and as a result, the first and second waveforms consisting of multiple periods Obtain the original waveform of Furthermore, in order to simplify the storage contents of the waveform memory, the difference between each sample point of the two current waveforms whose phases have been corrected as described above is obtained to obtain a differential waveform between the two waveforms, and the difference waveform between the two waveforms is obtained. One waveform is stored in the first waveform memory, and the difference waveform is stored in the second waveform memory. Since each sample point data of the differential waveform can be represented by smaller bits than normal waveform sample point amplitude data, the capacity of the second waveform memory can be reduced.

〔Example〕

FIG. 1 is an electrical block diagram showing an example of an electronic musical instrument related to the implementation of the present invention. The touch detection device 11 added thereto detects the touch, and this touch detection data is used as a first parameter for timbre change control to generate a musical tone signal having timbre and level characteristics controlled according to the intensity of the touch. be.
It also includes a soft pedal operator 16 and a brilliance operator 17, and the outputs of these operators are used as a second parameter for tone change control.

The first waveform memory 12 stores in advance a waveform of a certain characteristic (temporarily referred to as a first waveform) from the rising edge of sound generation to the end thereof. The second waveform memory 13 stores a waveform with characteristics different from the first waveform (temporarily stores it as a second waveform).
(referred to as the waveform), all waveforms from the rising edge of sound generation to the end are stored in advance. In this embodiment, the first waveform is a waveform with a characteristic corresponding to the strongest key touch, and the second waveform is a waveform with a characteristic corresponding to the weakest key touch.

An address data generation circuit 14 provided between the keyboard 10 and the waveform memories 12 and 13 is connected to the keyboard 10.
Waveform memory 12, 13 according to the pitch specified by
This is a reading means for reading out all the waveforms from the start to the end of sound generation. The first and second waveform signals are respectively read out from the derived memories 12 and 13 in accordance with the address data generated by the address data generation circuit 14 and inputted to the interpolation means 15. The interpolation means 15 synthesizes the output signals of both waveform memories 12 and 13 at a ratio according to the timbre change parameter given from the timbre change parameter establishment means 23, and shows the timbre change characteristics according to key touches and other timbre change parameters. It is used to obtain musical tone signals.

In the timbre change parameter setting means 23, the pair of interpolation coefficient memories 24a and 25a have previously stored interpolation coefficients K _1a and K _2a which have opposite characteristics with respect to the key touch intensity with a relatively gentle curve.
The harm interpolation numbers K _1a and K _2a are read out according to the touch detection data. Another pair of interpolation coefficient memory 2
4b and 25b store in advance interpolation coefficients K _1b and K 2b that have relatively steep curves and opposite characteristics with respect to the key touch strength, and read out the interpolation coefficients K _1b and _{K 2b according} to the touch detection data. .

The interpolation coefficients K _1a and K _{2a read from the interpolation coefficient memories 24a and 25b} are given to the inputs "1" of the selectors 26 and 27, respectively, and are input to the memories 24b and 25b.
The interpolation coefficients K _1b and K _2b read from are given to inputs "0" of selectors 26 and 27, respectively. The switch output signal of the soft pedal operator 16 is given to the selection control inputs of the selectors 26 and 27, and when the operator 16 is in the on state, the input "1" is changed by the switch output signal "1". coefficient
K _1a and K _2a are selected respectively, and when the switch is in the off state, the coefficient of the input "0" is determined by the "0" of the output signal of the switch.
Select K _1b and K _2b respectively. Selector 26, 27
The output of
The signals are input to multipliers 18 and 19 of No. 5, respectively, and are used as timbre change parameters for setting the timbre for setting the interpolation synthesis ratio. multiplier 18,
The readout outputs of the first and second waveform memories 12 and 13 are individually given to other inputs of the waveform memory 19.
The outputs of the multipliers 18 and 19 are added by an adder 20 to obtain an interpolated and synthesized musical waveform signal. This musical waveform signal is sent to the digital-to-analog converter 21.
After analog conversion, the sound system 22
given to.

The interpolation coefficient K _1a or K _1b given to the multiplier 18 via the selector 26 has a level that increases as the touch strength increases, and the interpolation coefficient K 1a or K 1b is given to the multiplier 18 via the selector 26, and the level increases as the touch intensity increases, and the waveform corresponding to the strongest touch read out from the first waveform memory 12 The level of the signal is determined by this interpolation coefficient in the multiplier 18.
Controlled according to K _1a or K _1b . Selector 27
The interpolation coefficient K _2a is given to the multiplier 19 via
The level of K _2b increases as the touch intensity becomes weaker, and the level of the waveform signal corresponding to the weakest touch read from the second waveform memory 13 is determined by the interpolation coefficient K _2a or K in the multiplier 19. Controlled according to _2b . Therefore, both multipliers 18, 19
The musical waveform signal obtained by adding and synthesizing the outputs of the keys in the adder 20 is obtained by interpolating the second waveform corresponding to the weakest touch and the first waveform corresponding to the strongest touch according to the key touch strength. This shows different timbre changes (waveform changes) depending on the key touch intensity.

By the way, the interpolation coefficients given to the multipliers 18 and 19 of the interpolation means 15, that is, the timbre change parameters, are determined not only by the key touch but also by the soft pedal operator 16.
and the output of the brilliance operator 17 as well. When the soft pedal operator 16 is in the OFF state, the interpolation coefficients K _1b and K _2b read from the memories 24b and 25b are selected by the selectors 26 and 27, and are sent to the multipliers 18 and 1 via the multipliers 28 and 29.
given to 9. When the soft pedal operator 16 is in the on state, the interpolation coefficients K _1a and K _2a read from the memories 24a and 25a are applied to the selectors 26 and 27.
is selected and applied to multipliers 18 and 19 via multipliers 28 and 29. When interpolation is performed using the interpolation coefficients K _1b and K _2b , the change in the value of the interpolation coefficient with respect to a touch change is relatively large, so touch response control is performed with relatively high sensitivity. On the other hand, when interpolation is performed using the interpolation coefficients K _1a and K _2a , the change in the value of the interpolation coefficient with respect to a touch change is relatively large, so touch response control is performed with relatively suppressed sensitivity. In this way, the sensitivity of the touch response control is adjusted according to the operating state of the soft pedal operation 16, and the degree of sensitivity adjustment is the same for all musical tones.

On the other hand, brilliance control data is generated from the brilliance control data generation circuit 30 in accordance with the operating state of the brilliance operator 17, and interpolation coefficients K ₃ and K ₄ for brilliance control are generated from the interpolation coefficient memories 31 and 32 in accordance with this control data. is now being read out. The interpolation coefficient memories 31 and 32 store interpolation coefficients K ₃ and K ₄ in advance as functions that have opposite characteristics to each other with respect to the value of the brilliance control data. Interpolation coefficient K ₃ read from memory 31
is given to the multiplier 28, and after being multiplied by the interpolation coefficient K _1a or K _1a from the selector 26, the multiplier 18
be given to. The interpolation coefficient K ₄ read from the memory 32 is given to the multiplier 29 and the selector 27
After being multiplied by the interpolation coefficient K _2a or K _2a from , it is given to the multiplier 19. In the interpolation using the interpolation coefficients K ₃ and K ₄ , the larger the brilliance control amount set by operating the brilliance controller 17, the more the interpolation coefficient K ₃ decreases and the interpolation coefficient K ₄ increases. As the ratio becomes higher and the brilliance control amount becomes smaller, the interpolation coefficient K ₃ increases, the interpolation coefficient K ₄ decreases, and the ratio of the first waveform becomes higher. In this way, the musical waveform signal obtained via the interpolation means 15 exhibits different timbre changes depending on the operating state of the brilliance operator 17. This brilliance operator 17 commonly applies timbre change control to any musical tone.

The first and second waveforms to be stored in the first and second waveform memories 12 and 13 are created by the following preprocessing.

Process 1: A predetermined natural musical instrument (for example, a piano) is played with a weak touch, and an original waveform A of multiple cycles from the start to the end of the sound as shown in FIG. 2a is obtained. The same natural instrument is played with a strong tut, and the original waveform B shown in Fig. 2b is obtained. Note that both original waveforms A and B have the same pitch.

Process 2... The phases of the original waveforms A and B prepared as described above are manipulated to correct the phases in a direction that reduces the mutual phase shift so that the mutual phase relationship does not shift too much. This phase operation is carried out by the following process 2a as an example:
As shown in 2c to 2c, one of the original waveforms B is subjected to a filter operation to obtain a waveform that approximates the other original waveform A.

Processing 2a... Divide the entire waveform section of original waveforms A and B into a plurality of frames (time frames), and perform spectrum analysis of both waveforms for each frame. This frame division is not limited to equal time intervals, but is set at appropriate intervals depending on the characteristics of the waveform change. In the illustrated example, the frame is divided into seven frames numbered 0 to 6. To show an example of spectrum analysis results for a certain frame, the original waveform A is
The original waveform B is as shown in Figure 3b.

Processing 2b... The deviation between both spectra in the same frame analyzed in Processing 2a is determined for each frame. For example, the spectral deviation in FIGS. 3a and 3b is c.

Processing 2c...Filter characteristic parameters for each frame are determined based on the spectral deviation for each frame obtained in Processing 2b, and the filter is applied to the original waveform B corresponding to the strong touch for each frame according to this filter characteristic parameter. Perform operations. This filter operation makes it possible to obtain a waveform that approximates the original waveform A corresponding to a weak touch.

After the above process 2c, the original waveform B corresponding to the strong touch that was the target of the filter operation is stored in the first waveform memory 12, and approximated to the original waveform A corresponding to the weak touch obtained by the filter operation. The second waveform
The waveform memory 13 of FIG. In this way, the waveform stored in the second waveform memory 13 approximates the original waveform A, but since it was obtained by operating the filter on the original waveform B, its phase differs from the original waveform B. There is no significant deviation. Therefore, it is possible to prevent the phases of the shapes stored in both waveform memories 12 and 13 from shifting too much.

As another example of the phase operation in the process 2,
The method shown in the following process 2' may also be used.

Process 2'... By shifting the phase of one or both of the original waveforms A and B by an appropriate amount for each predetermined phase interval, the phase is corrected in a direction in which the phases of both waveforms A and B match in each phase interval. In this way, the phase-corrected original waveform A,
B is stored in waveform memories 13 and 12, respectively. Even with such phase operation, both waveform memories 12,
It is possible to prevent the phase of the waveform stored in 13 from shifting too much.

As described above, the waveform memories 12 and 13 store the waveform corresponding to the strong touch and the waveform corresponding to the weak touch, respectively, whose phases are manipulated so that the phases of the two do not deviate too much. Therefore, the interpolation means 15
When the outputs of both waveforms 12 and 13 are interpolated and synthesized in , the synthesis can be performed without any inconvenience (without generating beats or the like due to phase shift).

FIG. 4 shows an electronic block diagram of an electronic musical instrument according to another embodiment of the present invention, only with respect to changes from FIG. 1.
Among the original waveforms whose phase has been corrected as in the above-mentioned processes 2a to 2c or 2', the waveform corresponding to the weak touch is stored. In this example, the above-mentioned processes 1 and 2 (2a to 2a)
After 2c, 2'), the following process 3 is added.

Processing 3: The difference between one of the phase-corrected original waveforms obtained as a result of the phase manipulation in Processing 2 and the local area is determined for each sample point, and as a result, the difference waveform between both waveforms whose phase has been corrected is obtained. get.

In this way, the difference waveform obtained in process 3 is stored in the second waveform memory 34. The timbre change parameter setting means 23A is provided with memories 24aA and 24bA similar to the above-mentioned memories 24a and 24b as interpolation coefficient memories for limit touch, and one of their outputs is sent to a selector 26A according to the output of the soft pedal operator 16. select. Further, the outputs of the interpolation coefficient memories 31 and 32 for brilliance are input as they are to the multiplication coefficients 18 and 19 of the interpolation means 15A. On the other hand, a new multiplier 35 is provided between the second waveform memory 34 and the multiplier 19, and the interpolation coefficient K _1a ′ or K _1b ′ selected by the selector 26A is input thereto.

In the interpolation means 13A, the interpolation coefficient _K1a ' or _K1b ' read out from the memories 24aA and 24bA according to the touch detection data is transferred to the second waveform memory 3.
4 (multiplier 35), and the multiplication result and the first waveform memory 3 are
The readout outputs of No. 3 (weak touch compatible waveforms) are added by an adder 20A. Note that the interpolation coefficient memory 24
bA reads "1" as the coefficient K _1b ' when the key touch is the strongest, and "0" as the coefficient K _1b ' when the key touch is the weakest.
0<< according to the touch intensity during that time.
A coefficient K _1b ′ that satisfies the condition K _1b ′<1 is read out.
Furthermore, the interpolation coefficient memory 24aA reads out "0" as K _1a ' when the key touch is the weakest, and in other cases, reads out a coefficient K _1a ' that follows a function whose slope is gentler than that of the coefficient K _1b '. read out. In this way, the addition ratio of the difference waveform data to the soft touch compatible waveform read from the memory 33 is controlled according to the key touch strength (also controlled with the sensitivity according to the operating state of the soft pedal operator 16), and A musical waveform signal having corresponding timbre change characteristics is synthesized. On the other hand, control according to the operating state of the brilliance operator 17 is performed by multiplying the outputs of both waveform memories 33 and 34 by interpolation coefficients K ₃ and K ₄ , respectively, as described above.

By the way, since the difference waveform stored in the memory 34 is the difference in amplitude value for each sample point between the strong touch corresponding waveform and the weak touch corresponding waveform, it contains many harmonics.
It has a spiky, wavy shape. If this spiky difference waveform is added, even at a small level, to the weak touch compatible waveform, there is a risk that the summed and synthesized waveform will suddenly look different from the weak touch compatible waveform read out from the memory 33. There is a possibility that the waveform will be different from that of the other performer. Therefore, as shown in FIG. 5, in the interpolation means 15A, a digital filter (low-pass filter) 36 is provided on the output side of the second waveform memory 34, and a filter characteristic parameter memory 36 is provided in accordance with the touch detection data.
It is preferable that the filter characteristic parameters corresponding to the key touches are read out from 7a and 37b, and selected by the selector 38 in accordance with the output of the soft pedal operator 16, thereby controlling the filter 36. In this filter control, when the soft pedal operator 16 is off, the weaker the key touch, the more rounded the differential waveform is output from the filter 36, and the stronger the key touch, the less rounded the differential waveform is output from the waveform memory 34. The filter 36 outputs a differential waveform that is close to the original differential waveform. When the strongest touch is reached, the waveform memory 34
The filter 36 outputs the output waveform without making any changes. Further, when the soft pedal operator 16 is on, the above-mentioned change in filter characteristics in response to a touch change is suppressed more than when it is off. By such control, when the touch is relatively weak, the difference waveform added to the waveform corresponding to the weakest touch (output of the memory 33) can be made smooth with less harmonic content, and as described above. defects will be removed.

Note that the first waveform memory 33 may store the strongest touch-compatible waveform, and the adder 20A may be used as a subtracter.

In each of the above embodiments, the waveform memories 12, 1
3, 33, and 34 assume that all waveforms from the start to the end of sound generation are stored, but the invention is not limited to this.
The waveform at the rising edge and part of the waveform thereafter may be stored. In that case, the address data generation circuit 14 reads out the entire waveform at the rising edge and then repeatedly reads out a portion of the waveform (this is also a multi-cycle waveform), thereby generating the entire waveform from the start of sound generation to the end. Read out. Incidentally, the amplitude envelope of the repeatedly read out waveform signal is provided by a suitable envelope providing means.

In addition, the multi-frequency waveform stored in the waveform memory is
It may consist not only of a plurality of continuous periods but also of a plurality of discrete periods. For example, the period from the start to the end of a musical tone is divided into multiple frames, and for each frame only the waveform information of one or two representative periods of the waveform is stored, and this waveform information is sequentially switched and read out repeatedly. Furthermore, if necessary, when switching the waveform, interpolation calculation may be performed between the previous waveform and the next new waveform to form waveform information that changes smoothly. Furthermore, as disclosed in Japanese Patent Application Laid-Open No. 142396/1983, only waveform information of a plurality of cycles of musical sound waveforms may be stored in a waveform memory, and this waveform information may be repeatedly read out. In this way, the capacity of the waveform memory can be further reduced.

In addition, the waveform from the start of sound generation to the point at which the sound attenuation reaches a predetermined level is stored in the waveform memory with an amplitude envelope, and only a portion of the subsequent waveform is stored in the waveform memory with a flat amplitude value maintained at the predetermined level. You may also do so. in this case,
After reading out the entire waveform from the start of sound generation until it reaches a predetermined level, the waveform portion that is maintained at a flat amplitude value at a predetermined level is repeatedly read out, and an appropriate envelope is applied to the repeatedly read waveform signal. A damping envelope beyond the predetermined level is provided by the means. This improves the S/N ratio in the attenuated portion.

In addition, the waveform memories 12, 13, and 33 do not store the musical waveform amplitude sample data as is (in other words, do not use the PCM method), but store difference data between adjacent sample amplitude values, and when reading out the data, the difference data is stored. A method (that is, a differential PCM method) may be used in which original amplitude sample data is obtained by cumulatively adding and subtracting data. Further, waveform data encoded according to any other appropriate waveform encoding method such as a delta modulation (DM) method or an adaptive delta modulation (ADM) method may be stored in the waveform memory.

In addition, when key scaling control of timbre is performed using the pitch or range of the pressed key as the timbre change parameter, the key touch strength or touch detection data in the description of each of the above embodiments can be read as the pitch or range of the pressed key. It can be implemented in exactly the same way.

〔Effect of the invention〕

As described above, according to the present invention, a musical tone signal exhibiting desired voice change characteristics is obtained by interpolating and synthesizing two types of waveform signals obtained based on the readout outputs of two waveform memories according to voice change parameters. As a result, even if there are only two types of high-quality waveforms stored in the waveform memory, similarly high-quality waveforms can be created with various timbre changes (pitch or pitch of a key touch or key press) based on these stored waveforms. Tone change according to various tone change factors such as the operation status of the controller)
This has the excellent effect of making it possible to realize such high-quality timbre changes with a relatively small-scale and low-cost configuration. The timbre change parameters used for interpolation synthesis include a first parameter for independently controlling timbre change for each musical tone to be generated, and a second parameter for controlling timbre change common to each musical tone. Since the settings are made based on the above, it is possible to diversify the controllable timbre change modes. In addition, since the second waveform corresponds to the difference waveform between the first waveform and the desired waveform, the storage capacity is relatively small, which contributes to simplifying the configuration and reducing costs. Furthermore, since a digital filter is provided that controls this second waveform signal with characteristics according to a filter characteristic parameter corresponding to the timbre change parameter, the second waveform signal can be further changed according to the timbre change parameter. By being controlled,
It is possible to realize even more complex timbre change control, to control the manner of timbre change even more complicatedly, and to perform processing to smooth the second waveform consisting of the difference waveform. play.

[Brief explanation of the drawing]

Fig. 1 is an electrical block diagram of an electronic musical instrument according to an embodiment of the present invention, and Fig. 2 a and b are diagrams illustrating two types of original waveforms produced by a natural musical instrument with mutually different timbre and volume characteristics. , Figures 3a and 3b are diagrams each showing an example of the spectrum in one frame of the waveforms in Figures 2a and b, Figure 3c is a diagram showing the spectral deviation between a and b, and Figure 4 is a diagram showing this example. An electrical block diagram showing an electronic musical instrument according to another embodiment of the invention with respect to changes from FIG. 1, and FIG.
FIG. 4 is a block diagram showing a modification of the interpolation means shown in the figure. 10...Keyboard, 11...Touch detection device, 1
2, 13, 33, 34... Waveform memory, 14...
Address data generation circuit, 15, 15A...Interpolation means, 16...Soft pedal operator, 17...Brilliance operator, 23, 23A...Tone change parameter setting means, 24a, 24b, 25a, 2
5b, 24aA, 24bA, 31, 32... interpolation coefficient memory, 37a, 37b... filter characteristic parameter memory.

Claims (1)

[Scope of Claims] 1. Pitch specifying means for specifying the pitch of a musical tone to be generated; and Concerning the first waveform, continuous control of the entire waveform or a part thereof from the rising edge of sound generation to the end. A first waveform memory that stores waveform data for multiple cycles of waveforms that are continuous or discrete; a second waveform memory that stores waveform data for a plurality of cycles of waveforms, the second waveform corresponding to a difference waveform of the first waveform with respect to a desired waveform; reading means for reading out waveform data from the first and second waveform memories, respectively, according to the pitch designated by the designation means; The second waveform signal is synthesized according to a timbre change parameter.
a digital filter that controls the second waveform signal with a characteristic corresponding to a filter characteristic parameter corresponding to the timbre change parameter; and a digital filter that controls the second waveform signal to be controlled or controlled by the digital filter at a level according to the timbre change parameter. a synthesis processing means including means for controlling the level according to a coefficient, and an arithmetic means for adding or subtracting the filter-controlled and level-controlled second waveform signal and the first waveform signal; A first parameter for independently controlling timbre change for each musical tone and a second parameter for controlling timbre change common to each musical tone to be generated are respectively generated, and the synthesis process is performed based on both parameters. An electronic musical instrument comprising: timbre change parameter setting means for setting the timbre change parameter used by the means. 2. The electronic musical instrument according to claim 1, wherein the first parameter corresponds to the intensity of a touch applied to a key pressed on a keyboard serving as the pitch specifying means. 3. The electronic musical instrument according to claim 1, wherein the first parameter corresponds to a pitch specified by the pitch specifying means or a range thereof. 4. The timbre change parameter setting means includes means for generating a plurality of series of the first parameters, and means for selecting one of the first parameters according to the second parameter. Electronic musical instruments as described in Scope 1.