JPS61204698A - Tone signal generator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a musical tone signal generating device capable of generating a musical tone signal having a controlled timbre in response to a key touch or other timbre control factors, and particularly relates to In a musical tone signal generation device that appropriately weights and synthesizes a plurality of series of waveform signals having different characteristics, the weighting function can be switched according to the type of selected timbre. Regarding.

[Conventional technology]

The entire waveform from the start to the end of the sound, or the entire waveform at the rising edge and a portion of the subsequent waveform, is stored in the waveform memory, and if the former is stored, the entire waveform can be read out in order to create a high-quality musical waveform signal. If the latter is stored, a high-quality musical waveform signal can be generated by reading out the waveform at the rising edge and then repeatedly reading out part of the waveform after that ( Unexamined Japanese Patent Publication 1972
-121313). Although this method of storing multi-cycle continuous waveforms in the waveform memory in advance can provide high-quality musical waveform signals, it requires a huge amount of memory capacity, so it is possible to It was unsuitable for achieving significant tonal 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. When trying to perform operator control that changes the tone depending on the operation status of a soft pedal or brilliance operator (for example, a soft pedal or brilliance operator), the simplest method is to create multiple waveform memories for each control content and select one of them. However, this would complicate the configuration and increase the capacity of the waveform memory, making it impractical. Therefore, one method is to prepare two types of continuous waveforms in the waveform memory, for example, in the case of touch response control, a continuous waveform corresponding to the strongest touch and a continuous waveform corresponding to the weakest touch. It is possible to obtain a waveform corresponding to the timbre change parameter (touch intensity) by reading out and interpolating both waveforms according to the timbre change parameter (touch intensity), which is disclosed in Japanese Patent Application No. 58-163336. disclosed inside.

[Problem that the invention seeks to solve]

By the way, in general, with natural instruments, the characteristics of timbre changes depending on touch intensity or the characteristics of timbre changes depending on pitch and range are not uniform for all natural instruments, but rather vary depending on the type of instrument. Each instrument is different, and in addition to the constant timbre of the instrument, these timbre change characteristics, together with the characteristics unique to that instrument, characterize the timbre unique to that instrument.

However, in the prior art including the above-mentioned prior application,
Function characteristics for interpolation have not been determined in consideration of the timbre change characteristics unique to each natural musical instrument. Therefore, there is no choice but to use a common interpolation weighting function l for numbers unrelated to the timbre type selected in the electronic musical instrument (which typically corresponds to various natural musical instruments such as pianos and guitars). Therefore, it is difficult to say that the conventional methods can faithfully imitate the timbre change characteristics of various natural musical instrument sounds in accordance with the unique characteristics of each.

This invention has been made in view of the above-mentioned points, and by making it possible to set the timbre change characteristics of musical sounds in response to key touches, key scaling, etc. to unique characteristics corresponding to each timbre type. The purpose is to make it possible to realize the rich timbre change characteristics seen in natural musical instruments.

[Means for solving problems]

The present invention includes a waveform storage means that stores waveform data relating to a plurality of series of waveforms having different characteristics, and a waveform signal obtained based on the waveform data of each series read from the storage means in accordance with weighted control data. A unique function of the weighted control data can be generated corresponding to each possible tone color by appropriately weighting the weighted control data based on the function corresponding to the selected or determined tone color. The present invention is characterized in that it includes weighting control data generation means for generating weighting control data.

Further, the second feature of the present invention is that two
A plurality of periods of waveform data regarding one series of waveforms among the series of waveforms is stored as first waveform data in the storage means, and a plurality of periods of waveform data regarding a differential waveform corresponding to the difference between the waveforms of both series is stored as second waveform data. The second waveform data is stored in the storage means as waveform data, and the waveform signal obtained based on the second waveform data is combined with the waveform signal obtained based on the waveform data of the rear cylinder 1 weighted appropriately according to the weighting control data. In a musical tone signal generating device that generates a musical tone signal whose timbre is controlled according to the weighting,
The present invention is provided with a weighting control data generating means similar to that described above.

A function of the weighting control data exhibiting a unique characteristic corresponding to the selected or predetermined timbre is selected, and weighting control data is generated based on this function.

The waveform signals are weighted according to this weighting control data, and the weighted waveform signals are finally synthesized to obtain a musical tone signal. The timbre of this musical tone signal is subtly variably controlled depending on the content of this weighting, and the timbre change characteristics realized thereby also differ depending on the type of timbre. Therefore, it becomes possible to more faithfully imitate, for example, the timbre change characteristics of various natural musical instrument sounds in response to key touches, key scaling, etc., in accordance with the respective unique characteristics.

As an example, the weighting content of each series of waveform signals is determined in response to a key touch. As another example, the weighting content is determined depending on the pitch or range of the musical sound to be generated. As yet another example, this weighting content may be
It is determined according to the operating state of the IJ angle operator or other operators. As a result, timbre change control is performed in response to key touching, key scaling, or operation of the operator.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail based on the accompanying drawings.

FIG. 1 is an electrical block diagram showing an embodiment of an electronic musical instrument to which a musical tone signal generating device according to the present invention is applied, and a keyboard is used as a means for specifying the pitch of a musical tone to be generated. The address signal generation circuit 11 corresponds to a reading means for reading waveform data from the waveform memory 12.13 in accordance with the pitch specified on the II board, and sends a key code KC indicating the pressed key to the keyboard. Input from circuit 10.

An address signal AD that changes at a rate corresponding to the pitch of the key indicated by this key code KC is generated.

The first waveform memory 12 stores waveform data of a plurality of periods consisting of an attack part and a sustain part regarding a waveform having the following characteristics (hereinafter referred to as a first waveform). The second waveform memory 13 stores waveform data of multiple periods consisting of an attack part and a sustain part regarding a waveform (temporarily referred to as a second waveform) having characteristics different from the first waveform. . Regarding the phase relationship between the waveform data stored in both waveform memories 12 and 13, for example, the attack part does not need to be particularly aligned in phase, but the sustain part can be adjusted in advance so that the phases of both series are matched as much as possible. The phases may be aligned, or the sustain section may not be particularly phase aligned, or both the attack section and the sustain section may be phase aligned.

In response to the key-on signal KOH given from the keyboard circuit 10, the address signal generation circuit 11 first generates an address signal AD for reading out the waveform data of the attack section, and then generates an address signal AD for reading out the waveform data of the sustain section. Generates address signal AD. Waveform data is read out in parallel from the first and second waveform memories 12.13 and applied to multipliers 16 and 17 of the weighting circuit 15. The weighting circuit 15 weights the waveform data of each series according to the weighting coefficients (weighting control data) TKI, TK2 generated corresponding to each series from the weighting coefficient generating circuit 18. That is, the coefficient TKI is input to the multiplier 16 to weight the waveform data read from the first waveform memory 12, and the coefficient TK2 is input to the multiplier 16.
7 and read out from the second waveform memory 13. The two series of weighted waveform data are additively combined by an adder 19.

The touch detection device 21 detects the touch of a key pressed on the keyboard, and provides touch detection data TD to the weighting coefficient generation circuit 18. The weighting coefficient generation circuit 18 generates a weighting coefficient TK1 that instructs different weighting contents depending on the strength of the key touch indicated by the touch detection data TD.
．． Generates TK2.

In this embodiment, the first waveform memory 12 stores a waveform having characteristics corresponding to the strongest key touch, and the second waveform memory 13 stores a waveform having characteristics corresponding to the weakest key touch. is memorized. Therefore, the weighting circuit 15 uses weighting coefficients TKI, TK according to the key touch.
2, interpolation is performed between the waveform data corresponding to the strongest touch and the waveform data corresponding to the weakest touch, and as a result, a musical waveform signal having characteristics corresponding to the strength of the key touch at that time is obtained. It will be done.

The waveform data output from the weighting circuit 15 is sent to the multiplier 2.
4 and is multiplied by the amplitude envelope waveform data generated from the envelope generator 25. Multiplier 24
The output of is given to the digital/analog converter 26,
After being converted into an analog signal, it is applied to the sound system 27.

Next, specific examples of waveforms stored in the waveform memories 12 and 13 will be described.

FIG. 2 shows an example of the waveform (original waveform) of an actual piano sound played with a strong touch. Figure 3 shows an example of the waveform (original waveform) of the same piano sound played with a weak touch.For convenience of illustration, temporally continuous waveforms (a), (b), ( It is shown divided into four parts, C) and (d). In general, it is difficult to determine exactly where in a musical sound waveform the attack part begins and where the sustain part begins, but the attack part is from the beginning of the sound to the point where the waveform shape and amplitude are stabilized, and the part after that is the sustain part. Department. Therefore, in Figures 2 and 3,
Generally, parts (a) and (b) are the attack part, and parts (c) and (
The part d) is the sustain part. Of course, this varies from person to person.

The part up to the middle of (b) may be used as the attack part, or (
The part a) may be an attack part, and the parts after (b) may be a sustain part. Although not shown, the sustain section continues after (cl).

The first waveform memory 12 stores waveform data of a waveform consisting of multiple cycles of an attack part corresponding to a strong touch as shown in FIGS. 2(a) and 2(b) in a storage area corresponding to a piano tone. Subsequently, waveform data of a waveform consisting of a plurality of cycles of a sustain portion corresponding to a strong touch as shown in FIGS. 2(c) and 2(d) is stored. The second waveform memory 13 stores waveform data of a waveform consisting of multiple periods of attack parts corresponding to weak touches as shown in FIGS. 3(a) and 3(b) in a storage area corresponding to a piano tone. Subsequently, waveform data of a waveform consisting of a plurality of cycles of a sustain portion corresponding to a weak touch as shown in FIGS. 3(C) and 3(d) is stored.

The waveform of the sustain section stored in both memories 12 and 13 is as follows:
It may be all of the remaining waveforms following the waveform of the attack section stored in the same memory 12.13, but it may not be open to that, but may be a multiple-cycle waveform extracted as appropriate, or a representative single-cycle waveform. If you want to store all the remaining waveforms up to the end of one Moyoi sound in the waveform memory 12.13,
According to the address signal AD generated from the address signal generating circuit 11, control is performed so that only one waveform data of the attack section and the sustain section stored in the memory 12.13 is read out. On the other hand, if the sustain part waveform of a limited number of cycles or one cycle is stored in the memory 12.13,
After the waveform data of the attack section stored in the memory 12, 13 is read out once in accordance with the address signal AD, the waveform data of the sustain section is controlled to be repeatedly read out.

Since such single read control or repeated read control of a series of waveform data can be easily performed by a well-known method, details thereof will not be particularly shown.

As shown in FIGS. 2 and 3, each waveform memory 12.13 encodes the original waveform itself with a natural amplitude envelope in a predetermined encoding format (for example, PCM: pulse code modulation method), and stores the resulting waveform. Data may also be stored. In that case, the envelope generator 25 generates envelope waveform data, as shown in FIG. 4(a), which maintains a constant level during key depression and attenuates in response to key release. As is well known, the attenuation envelope waveform at the time of key release is used to perform dump control at the time of key release if the musical sound waveform in the sustain section has attenuation envelope characteristics with a percussive volume. This is to attenuate the pronunciation when the key is released if it has a sustained tone envelope characteristic (or if it actually has a sustained tone envelope characteristic due to repeated reading).

On the contrary, each waveform memory 12.13 does not store the original waveform itself with a natural amplitude envelope, but performs data manipulation that normalizes the amplitude level (peak level of each wave) of this original waveform to a constant level. (Of course, even if you do so, the characteristics of each wave will not be impaired), and convert the waveform with the standardized amplitude level into a predetermined encoding format (
For example, the waveform data may be stored by encoding it using the PCM method. In that case, the envelope generator 2
In step 5, envelope waveform data showing appropriate amplitude envelope characteristics as shown in FIG. , adds amplitude envelopes such as sustain. The waveform data with the standardized amplitude level is stored in the waveform memory 12.1.
The advantage of storing data in 3 is that for waveforms whose actual amplitude levels are relatively small, the number of bits in the data representation can be increased by increasing the apparent level, thereby increasing the resolution in waveform reproduction. This is something that can be done. Moreover, this can be achieved by efficiently utilizing memory without particularly increasing the memory capacity.

Each of the waveform memories 12 and 13 stores waveform data of the above-mentioned attack portion and sustain portion for each type of timbre that can be selected or specified by the timbre selection device 128. The timbre selection device 28 outputs timbre selection information TC indicating the selected or designated timbre.

This is supplied to the waveform memory 12, 13 and other circuits. The waveform memory 12.13 makes it possible to read the waveform corresponding to the timbre specified by the applied timbre selection information TC, and reads out the waveform data of this waveform in accordance with the address signal AD, as described above.

The timbre selection information TC is also given to the weighting coefficient generation circuit 18, and the weighting coefficient TKI for the touch intensity,
The function characteristics of TK2 are made to vary depending on the selected tone color type. An example of this is shown in FIG. 5, where (a) shows the function of the weighting coefficient TKI of one series for the touch detection data TD, and (b) shows the function of the weighting coefficient TK2 of the other series. , and the solid line shows an example of these functions corresponding to a piano tone.

The dashed line shows an example of these functions corresponding to a guitar tone.The slope of the function is steeper for a piano tone, which means that the degree of tone change in response to a key touch is greater. By changing the weighting function characteristics according to the timbre, it becomes possible to more faithfully imitate the timbre change characteristics of various natural musical instrument sounds in accordance with the respective characteristics.

The weighting coefficient generation circuit 18 may be configured, for example, by a memory that stores the weighting function characteristics corresponding to various tones, or may be configured to generate a selected tone by using the touch detection data TD as a variable. It may be configured by an arithmetic circuit that calculates a weighting function characteristic equation corresponding to , or it may be configured by a combination of a memory and an arithmetic circuit. Note that the timbre selection information TC may also be provided to the touch detection device 21 so that the characteristics of the touch detection data are varied depending on the timbre.

The timbre selection information TC is also given to the envelope generator 25 to control the characteristics of the envelope waveform to be generated (curves such as attack, decay, sustain, dump, etc., level, time, etc.) according to the selected timbre. Touch detection data TD is also provided to the envelope generator 25, which controls the maximum level of the envelope waveform according to the strength of the key touch.

FIG. 6 shows a modification of the embodiment shown in FIG. The first waveform memory 12A stores waveform data of a plurality of periods of attack and sustain parts of a waveform corresponding to a weak touch (for example, a waveform as shown in FIG. 3). Second
The waveform memory 13A contains a waveform (
For example, the waveform shown in FIG. 2) and the first waveform memory 12A
The waveform data of the difference waveform from the waveform corresponding to the weak touch stored in is stored. The weighting circuit 15A includes a multiplier 29 that multiplies the waveform data of the differential waveform read from the second waveform memory 13A by a weighting coefficient TK, and a first
The 0 weighting coefficient generating circuit 18A, which includes an adder 30 that adds the waveform data corresponding to a weak touch read out from the waveform memory 12A of the key touch and the output of the multiplier 29, generates a weighting coefficient when the key touch is the strongest. ``1'' is generated as TK, ``0'' is generated as TK when the TK is the weakest, and a weighting coefficient TK that satisfies the condition O<TK<1 is generated according to the touch intensity during that time according to a predetermined function. It is preferable that the functional characteristics of this weighting coefficient TK also vary depending on the selected timbre. In the example of FIG.
The addition ratio of the differential waveform data to the weak touch compatible waveform read from A is controlled according to the key touch strength, and as a result, the waveform data having characteristics according to the touch strength is weighted as in the embodiment of FIG. It is output from the attaching circuit 15A.

According to this configuration, since one waveform memory 13A is a differential waveform memory, the storage capacity of the memory can be further reduced. Note that the waveform data of the attack portion and sustain portion of the waveform corresponding to the strongest touch may be stored in the first waveform memory 12A, and the adder 30 may be changed to a subtracter.

By the way, since the difference waveform stored in the memory 13A is the difference in amplitude value for each sample point between the strong touch compatible waveform and the weak touch compatible waveform, it is a spiky waveform with a large harmonic content. When this thorny difference waveform is added to the waveform that supports weak touch even at a small level, the waveform that has been added and synthesized will be
There is a possibility that the waveform may suddenly become different from the weak touch compatible waveform read from 2A, and may also be different from the waveform of the actual sound of a natural musical instrument performance. Therefore.

6 is changed as shown in FIG. 7, the second waveform memory 13
Digital filter (low pass filter) on the output side of A
31 is provided, and reads out the filter characteristic parameters corresponding to the key touch from the filter characteristic parameter memory 32 according to the touch detection data TD.
It is a good idea to control the In this filter control, the weaker the key touch, the more rounded the difference waveform becomes in the filter 31.
The filter 31 outputs a differential waveform that is close to the original differential waveform output from the waveform memory 13A and becomes less rounded as the touch becomes stronger. Then, when the touch is the strongest, the output waveform of the waveform memory 13A is outputted from the filter 31 without making any changes. Through such control, when the touch is relatively weak, the difference waveform added to the waveform corresponding to the weakest touch (output of the memory 12A) can be made smooth with less harmonic content, thereby eliminating the above-mentioned disadvantages. is removed.

Note that the tone color selection information TC is input into the memory 32.

The filter characteristic parameters may be read out not only in response to a key touch but also in response to a selected timbre, and the digital filter 31 may be provided on the output side of the multiplier 29.

Note that when performing timbre change control (i.e. key scaling) according to the pitch or range of the musical tone to be generated, the 1 weighting coefficient generation circuit 18.18A (Figs. 1, 6, 7)
Instead of the touch detection data TD, the key code KC may be input as shown by the dotted line as the input data in FIG.

The key code KC is also input to the envelope generator 25 to control the maximum level, decay time, etc. of the envelope waveform according to the pitch or range.

In addition, when performing tone change control according to the operating state of a predetermined operator 33 (FIG. 1), the weighting coefficient generation circuit 18
．． As input data of 18A, instead of touch detection data TD or key code KC, the operator 33 is used as shown by the dotted line.
All you have to do is input the output of

Of course, when applying the circuit of FIG. 1, FIG. 6, or FIG. 7 to key scaling or control according to operator operation, the first and second waveform memories 12.12A, 13.
The waveforms stored in 13A do not correspond to strong and weak touches, but correspond to high and low pitches, or to large and small amounts of operation of the operator.

Furthermore, tone color change control may be performed by combining any one or more of key touching, key scaling, and the operation state of the operator 33. FIG. 8 is a diagram partially showing one example, in which the first, second, and second waveform memories 12.
13 and the weighting circuit 15. In the waveform memory 12H, waveform data of a plurality of periods of musical waveforms having tone characteristics corresponding to strong key touches and high pitches are stored for each tone in the same manner as described above.

In the waveform memory 12L, waveform data of a plurality of periods of musical waveforms having tone characteristics corresponding to strong key touches and low pitches are stored for each tone in the same manner as described above. In the waveform memory 13H, waveform data of a plurality of periods of musical waveforms having tone characteristics corresponding to weak key touches and high pitches are stored for each tone in the same manner as described above. In the waveform memory 13L, waveform data of a plurality of periods of musical waveforms having tone characteristics corresponding to a weak key touch and a low pitch are stored for each tone in the same manner as described above.

These waveform memories 12H to 13L are as described above.
The tone color corresponding to the tone color type selected according to the tone color selection information TC can be read out, and is read out at an appropriate pitch frequency according to the address signal AD.

The waveform data corresponding to a strong key touch read from the waveform memo 1J12H112L is input to multipliers 33 and 34 for weighting for key scaling, respectively. The other inputs of the multipliers 33 and 34 are input with two series of key scaling coefficients Sl and KS2 generated by the key scaling coefficient generation circuit 35 in accordance with the key code KC. Weighting according to the pitch of the tones is applied to both waveform data for strong touch.

The outputs of the multipliers 33 and 34 are added by an adder 36, and then provided to the multiplier 16, where they are multiplied by a weighting coefficient TKI corresponding to the key touch similar to that described above.

Similarly to the above, the output of waveform memory 13H113L is applied to multipliers 37 and 38, and multiplied by key scaling coefficients KS3 and KS4 generated from key scaling coefficient generation circuit 39 in accordance with key code KC. As a result, both waveform data for weak touch are weighted according to the pitch of the musical tone to be generated. The outputs of the multipliers 37 and 38 are added by an adder 40, and then provided to a multiplier 17, where they are multiplied by a weighting coefficient TK2 corresponding to the key touch similar to that described above.

The outputs of the multipliers 16 and 17 are added together by an adder 19 and applied to a 1 multiplier 24 (FIG. 1). In this way, the four series of waveform data having different characteristics read from the waveform memories 1jH to 1.3L are weighted according to both the pitch of the musical tone to be generated and the key touch, and these timbre control factors are weighted. The weighting circuit 15B outputs waveform data to which a timbre change is applied in accordance with the timbre change.

Tone selection information TC is input to the key scaling coefficient generation circuits 35 and 39, respectively. As mentioned above, the function characteristics of the key scaling coefficients differ depending on the tone type (for example, as shown in Figure 5), and the function characteristics of the key scaling coefficients KSI to KS4 to be generated depend on the selected tone. It is determined. Note that the key scaling coefficient generation circuits 35 and 39 may not be provided separately, but one may be shared.

Note that in the example of FIG. 8, weighting calculations for key scaling are performed and then weighting calculations are performed according to key touches, but this may be reversed. Further, when combining the tone color change control according to the operating state of the operator with the tone color change control according to key touching or key scaling, the same configuration as shown in FIG. 8 may be used. Furthermore, it is also possible to combine all three of key touch, key scaling, and operator control, and in that case, the structure may be configured according to FIG. 8.

In the above embodiments, a case has been described in which a musical tone signal of a scale tone is generated by specifying the pitch of a musical tone to be generated using a keyboard, but the musical tone signal generating device according to the present invention can also be applied to a rhythm sound source. can do. In that case, the weighting control data is based on data that simulates the strength when operating a rhythm instrument (for example, data based on the operation of a controller, data included in rhythm pattern data, or data input externally). All you have to do is make it happen.

Further, in the above embodiments, the case of monophonic pronunciation is explained, but it can also be implemented in the case of polyphonic pronunciation. In that case, for example, a waveform memory, a weighting circuit, etc. may be time-divisionally shared among a plurality of musical tone generation channels.

In the above embodiment, two series of waveform memories are provided for one timbre control factor, but the number of waveform memories may be three or more series. In that case, three or more series of waveform data may be weighted simultaneously, or two series may be selected and weighted from among them.

Furthermore, in the above embodiment, it has been explained that the waveform memory that stores waveforms corresponding to predetermined timbre control states such as 1. strong touch or weak touch is constituted by a separate memory in terms of hardware. It may be a common memory device. For example, the waveform data of the attack section corresponding to a strong touch corresponding to a tone is stored in the memory area of address A-B, and the waveform data of the attack section corresponding to a weak touch is stored in the memory area of addresses B+1 to C. , the waveform data of the sustain section corresponding to a strong touch is stored in the memory area from address C+1 to D, and the waveform data of the sustain section corresponding to a weak touch is stored at addresses D+1 to D+1.
(However, A, B, C, D, and E are predetermined address values with the relationship of A<B<C (D (E). In that case, each waveform from each memory area Data reading is controlled in a time-division manner.

In FIG. 1, a digital filter may be provided after the weighting circuit 15 to further change the timbre according to timbre control factors such as key touch and key scaling.

Further, the encoding format of the waveform data stored in the waveform memory is not limited to the above-mentioned PCM method, but may also include a differential PCM method, an adaptive differential PCM method, a delta modulation (DM) method, an adaptive delta modulation (ADM) method, etc.

Other suitable waveform encoding formats may be used. In that case,
It is preferable to provide a decoding circuit suitable for the encoding format after the waveform memory so as to return (decode) the encoding format of the waveform data read from the memory to the PCM format.

Alternatively, the weighted waveform signals of each series may not be electrically added and synthesized by an adder, but instead generated as separate series and spatially added and synthesized.

Furthermore, the multi-period waveform stored in the waveform memory may consist not only of continuous plural periods but also of discontinuous plural periods. For example, the period from the start to the end of a musical tone is divided into multiple frames, and each frame is divided into one representative frame.
It is also possible to store only the waveform data of a period or two periods of waveforms, and read out the waveform data repeatedly while switching sequentially. Furthermore, if necessary, when switching the waveform, the previous waveform and the next new waveform can be read out. It is also possible to perform interpolation calculations to form waveform data that changes smoothly.

In the above embodiment, waveform data consisting of a plurality of cycles of the attack part and the sustain part is stored in the waveform memory for each series, and both the waveform signals of the attack part and the sustain part obtained based on reading of this waveform memory are stored. Both waveform signals are weighted appropriately, but the waveform signal to be weighted may be either the attack portion or the sustain portion. For example, by storing multiple series of waveform data of multi-cycle waveforms of the attack section, reading them out and weighting them, a musical tone signal of the attack section with timbre changes according to key touches, key scaling, etc. is generated. However, on the other hand, only one series of sustain section waveform data is stored, and the read-out sustain section waveform data is not weighted (therefore, no timbre change is applied to the sustain section in response to key touches, etc.). It's okay. The above is the same for the embodiments shown in FIGS. 6 and 7, and the waveform memory 13A stores waveform data representing a difference waveform only for the attack portion, and does not store waveform data for the sustain portion. You can do it like this.

Furthermore, in the case where only one sequence of waveform signals is generated for the sustain section and weighting is not performed, the device for generating the waveform signal for the sustain section is the one described in the above embodiment. The present invention is not limited to a waveform memory, but other tone waveform generating means, such as a harmonic synthesis method or a tone waveform synthesis method using frequency modulation calculations, may be used.

〔Effect of the invention〕

As described above, according to the present invention, waveform data of a plurality of periods regarding a plurality of series of waveforms having different characteristics are respectively stored in a memory, and a waveform signal obtained based on the waveform data of each series read from the memory is weighted. By weighting appropriately according to the weighting control data, timbre change control is performed according to the weighting, so it is possible to obtain a high-quality musical tone signal and to change the timbre of this high-quality musical tone signal in various ways. It is possible to perform delicate control according to various timbre control factors, and furthermore, this timbre change control can be realized by a reduced waveform memory configuration. In particular, according to this invention,
Since the function of the weighting control data exhibits unique characteristics depending on the selected or specified timbre type, the timbre change characteristics realized thereby also differ depending on the timbre type. Therefore, it becomes possible to more faithfully imitate, for example, the timbre change characteristics of various natural musical instrument sounds in response to key touches, key scaling, etc., in accordance with the respective unique characteristics.

According to the second feature of the invention, only one of the two series of waveform data is stored in the memory, and the waveform data of the difference waveform of both series is stored in the memory, and the waveform of the difference waveform read from the memory. Since the musical tone signal is obtained by appropriately weighting the waveform signal obtained based on the data and combining it with the waveform signal obtained based on one series of waveform data read from the memory, in addition to the above-mentioned effects, Furthermore, compared to the case where two series of waveform data are stored as they are, memory capacity can be saved by storing the difference waveform.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the overall configuration of an electronic musical instrument according to an embodiment of the present invention, FIG. 2 is a waveform diagram showing an example of the musical sound waveform of an actual piano sound played with a strong touch, and FIG. A waveform diagram showing an example of the musical sound waveform of an actual piano sound played with a weak touch, Fig. 4 is a diagram showing an example of the amplitude envelope waveform, Fig. 5 is a graph showing an example of the weighting coefficient function, Fig. 6 The figure is a block diagram showing a modification example of the waveform memory and weighting circuit in Figure 1, Figure 7 is a block diagram showing a modification example of Figure 6, and Figure 8 is a timbre change by combining multiple timbre control factors. FIG. 2 is a block diagram showing a modification example of the waveform memory and weighting circuit of FIG. 1 in the case of adding a . 10... Keyboard circuit, 11... Address signal generation circuit, 12.12A, 12H112L, 13, 13A. 13H113L...Waveform memory, 15.15A, 1
5B...Weighting circuit, 18.18A...Weighting coefficient generation circuit, 21...Touch detection device, 33...
Operator, 35.39...Key scaling coefficient generation circuit.

Claims (1)

[Scope of Claims] 1. A timbre selection means for selecting or specifying the timbre of a musical sound to be generated, and each timbre that can be selected or specified by the timbre selection means from waveform data regarding a plurality of series of waveforms having different characteristics. waveform storage means that stores the plurality of series of waveform data corresponding to the selected or designated timbre, respectively, and is capable of outputting the plurality of series of waveform data corresponding to the selected or designated timbre; and a reading means that reads out the plurality of series of waveform data from the waveform storage means. and weighting means for weighting the waveform signals of the plurality of series of waveforms obtained based on the read waveform data according to weighting control data, and a timbre selectable or designable by the timbre selection means. weighting control data generating means capable of generating a unique function of the weighting control data corresponding to each timbre, and generating the weighting control data based on the function corresponding to a selected or specified timbre; A musical tone signal generator equipped with 2. The weighting control data generating means is configured to control the weighting control for instructing different weighting contents depending on the intensity of the touch applied to the key pressed on the keyboard for specifying the pitch of the musical tone to be generated. A musical tone signal generating device according to claim 1, which generates data. 3. The weighting control data generating means generates the weighting control data that instructs different weighting contents depending on the pitch or range of the musical tone to be generated. musical tone signal generator. 4. The weighting control data generating means generates the weighting control data that instructs different weighting contents depending on the operation state of a predetermined timbre control operator. musical tone signal generator. 5. A musical tone signal of a rhythmic sound is generated, and the weighting control data instructs different weighting contents depending on data simulating the strength when operating a rhythm instrument. The musical tone signal generating device according to scope 1. 6. A timbre selection means for selecting or specifying the timbre of a musical tone to be generated, and storing waveform data of a plurality of cycles regarding one series of waveforms of two series of waveforms having different characteristics as first waveform data. In addition, waveform data of a plurality of cycles regarding a difference waveform corresponding to the difference between the waveforms of the two series is stored as second waveform data, and the first and second waveform data can be selected or specified by the timbre selection means. a waveform storage means which is stored corresponding to each tone color and is capable of outputting the first and second waveform data corresponding to the selected or designated tone color; reading means for respectively reading second waveform data; and the first waveform read after weighting a waveform signal obtained based on the read second waveform data according to weighting control data. weighting synthesis means for synthesizing with a waveform signal obtained based on the data and outputting it as a musical tone signal; and generating a unique function of the weighting control data corresponding to each tone that can be selected or specified by the tone selection means. weighting control data generating means for generating the weighting control data based on the function corresponding to the selected or specified tone color. 7. The musical tone signal according to claim 6, wherein the weighting synthesis means includes means for suppressing harmonic components of the waveform signal that is weighted or weighted according to the weighting control data. Generator.