JPS61204697A - 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 The present invention relates to a musical tone signal generating device that appropriately weights and synthesizes a plurality of series of waveform signals having different characteristics.

[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 operating state of a soft pedal or ans control (for example, a soft pedal or an IJ/IJ anth operator), the simplest method is to provide multiple waveform memories for each control content, and to It would be possible to select one and read it out, but this would complicate the configuration and at the same time increase the capacity of the waveform memory, making it impractical. Therefore, one method is to use two types of continuous waveforms, for example, in the case of touch response 7 control.
Prepare a continuous waveform corresponding to the strongest touch and a continuous waveform corresponding to the weakest touch in the waveform memory, read out both waveforms at the same time, and interpolate both waveforms according to the timbre change parameter (touch intensity). Tone change parameters (
It is possible to obtain a waveform corresponding to the touch intensity), and this is disclosed in Japanese Patent Application No. 163336/1982.

In that case, when storing each of the above-mentioned waveforms in the waveform memory, it is preferable to perform a phase matching operation so that the phases of the waveforms to be stored are substantially matched in order to perform the above-mentioned interpolation processing without any trouble. However, in general, the two
Since various types of waveforms are copies of actual performance sound waveforms, it has not always been easy to match the phases of such waveforms.

[Problem that the invention seeks to solve]

This invention has been made in view of the above points, and is a musical tone signal generator that generates a musical tone signal having a controlled tone according to key touches, key scaling, etc. by weighting multiple series of waveforms. It is an object of the present invention to enable a device to simplify phase matching of waveforms between each series without significantly deteriorating the sound quality of the obtained musical tone signal.

[Means for solving problems]

Generally, the attack part of a musical tone tends to have a fluctuating pinch and also has a lot of noise components, so it is quite troublesome to adjust the phase of the waveform. On the other hand, in the part after the attack part where the waveform is stable, that is, in the sustain part, there is little pitch variation, making it easier to perform phase adjustment. In addition, it is important that the phases of the waveforms of each series match in this sustain section, so that the steady timbre and volume of the musical tone signal obtained by interpolating the waveforms of each series are not impaired. be.

Therefore, the present invention includes a waveform storage means that stores waveform data of multiple periods each consisting of an attack portion and a sustain portion regarding multiple series of waveforms having different characteristics,
A musical tone signal generating device capable of generating a musical tone signal with timbre change by suitably weighting and synthesizing waveform signals obtained based on each series of waveform data read from the waveform storage means, The waveform data of the sustain part to be stored in the waveform storage means is phase-manipulated in advance so that the phases of each series are almost matched, and the waveform data of the sustain part of each series in the phase-manipulated state is stored in the waveform storage means. It is characterized by being memorized.

Further, the second feature of the present invention is that two
Waveform data of multiple cycles consisting of an attack part and a sustain part regarding one series of waveforms among the series of waveforms is first
The second waveform data is stored in the storage means as second waveform data, and the second waveform data is stored as second waveform data in the second waveform data. By combining the waveform signal obtained based on the waveform data of the rear cylinder 1 with the waveform signal obtained based on the waveform data of the rear cylinder 1 which has been appropriately weighted according to the weighting control data, the timbre is controlled according to the weighting. In a musical tone signal generating device for generating a musical tone signal, the phase of a multi-cycle waveform of a sustain portion of at least one of two series of original waveforms having different characteristics including an attack portion and a sustain portion is manipulated. By adjusting the phase in the direction of reducing the mutual phase shift using Waveform data of a differential waveform corresponding to the difference between the two series of waveform data is prepared in advance, and waveform data of one series of the two series of waveform data prepared is stored in the storage means as the first waveform data. The waveform data of the prepared difference waveform is stored in the storage means as the second waveform data.

[Effect]

A plurality of series of waveform signals are weighted, and the weighted waveform signals are finally synthesized to obtain one musical tone signal. The timbre of this musical tone signal is controlled according to the content of this weighting.

Since the waveform signals of each series are almost phase-aligned in the sustain section, problems such as waveform cancellation due to phase shift do not occur in the sustain section of the resulting musical tone signal, which would impair steady tone and volume. Never.

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 means for specifying the pitch of a musical tone to be generated. The address signal generating circuit 11 corresponds to a reading means for reading waveform data from the waveform memory 12.13 according to the pitch specified on the keyboard, and sends a key code KC indicating the pressed key to the keyboard circuit. Enter from 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. . What is the phase relationship between the waveform data stored in both waveform memories 12 and 13?

The attack part does not need to be particularly phase-aligned, but the sustain part should be phase-aligned in advance so that the phases of both series match as much as possible.

In response to the key-on signal KON applied 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 161 to weight the waveform data read from the first waveform memory 12, and the coefficient TK2 is input to the multiplier 161.
7 and read out from the second waveform memory 13 is weighted. 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 TKI that instructs different weighting contents depending on the strength of the key touch indicated by the touch detection data TD.
, TK2 is generated.

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 explained.

FIG. 2 shows an example of the waveform (original waveform) of an actual piano sound played with a strong touch. FIG. 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 are shown in (a).

It is shown divided into four parts (b), (c), and (d). In general, in a musical sound waveform, where does the attack section end?
It is difficult to determine exactly where the sustain part begins, but the attack part is from the beginning of the sound until the waveform shape and amplitude stabilize, and the part after that is the sustain part. Therefore, in Figures 2 and 3, approximately (a) and (b)
) is the attack part, and parts (C) and (d) are the sustain part. Of course, there is a wide range in this respect, (b)
In the middle of , the part may be used as an attack part, or the part (a) may be made an attack part, and the part after (b) may be made a sustain part. Note that, although not shown, the sustain section continues after (d).

In the first waveform memory 12, waveform data of a waveform consisting of multiple cycles of the attack part corresponding to a strong touch as shown in FIG. 2(a') and (b) is stored in the storage area corresponding to the piano tone. Memorize and then continue with Figures 2 (C) and (d).
Waveform data of a waveform consisting of a plurality of cycles of a sustain portion corresponding to a strong touch as shown in FIG. Second waveform memory 13
3 (a) in the memory area corresponding to the piano tone.
), storing waveform data of a waveform consisting of multiple cycles of the attack part corresponding to a weak touch as shown in (b),
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 after being subjected to phase matching processing as described later.

The phase matching process of the waveform data of the sustain section to be stored in the waveform memory '12.13 is performed, for example, as follows.

Two types of original waveforms played at the same pitch but with different touches (for example, the waveforms shown in Figures 2 and 3)
, the multi-period waveform of the part to be stored as the sustain part (for example, Fig. 2 (C), (d) and Fig. 3 (c), (d)
)) respectively.

Next, the phase of the waveform data in the two cut out sustain part original waveforms is manipulated to correct the mutual phase shift in the direction of reduction and contraction so that the mutual phase relationship does not shift too much. This phase matching operation.

For example, by dividing the sustain part original waveform into multiple frames,
This is preferably carried out by performing phase correction on a frame-by-frame basis. Furthermore, a digital filter, spectrum analysis, or the like may be used to correct the phase on a frame-by-frame basis.

In other words, each sustain part original waveform corresponding to a strong touch and a weak touch (Fig. 2 (c), (d) and Fig. 3 (c)
) and (d)) are analyzed for each frame, and the deviation between both spectra in the same frame is determined for each frame based on the spectrum analysis results of each original waveform. Then, a filter characteristic parameter for each frame is determined based on the determined spectral deviation for each frame, and a filter operation is performed for each frame on the sustain part original waveform corresponding to a strong touch according to this filter characteristic parameter. Through this filter operation, it is possible to obtain a waveform that approximates the sustain part original waveform corresponding to a weak touch.

After the above processing, the sustain part original waveform corresponding to the strong touch that was the target of the filter operation is stored in the first waveform memory 12.
The second waveform memory 13 stores a waveform that approximates the sustain part original waveform corresponding to the weak touch obtained by the filter operation. In this way, the waveform stored in the second waveform memory 13 is similar to the sustain part original waveform corresponding to a weak touch, but it is obtained by filtering the sustain part original waveform corresponding to a strong touch. Therefore, its phase does not deviate too much from the sustain part original waveform corresponding to a strong touch. Therefore, it is possible to prevent the phases of the waveforms stored in the frequency waveform memories 12 and 13 from shifting too much.

The phase-manipulated sustain part waveform stored in both memories 12.13 may be the entire remaining waveform following the attack part waveform stored in the same memory 12.13, but is not limited to this, and may be extracted as appropriate. It may also be a waveform with multiple cycles. When storing all remaining waveforms up to the end of sound generation in the waveform memory 12.13, the attack and sustain portions stored in the memory 12.13 are stored in accordance with the address signal AD generated from the address signal generation circuit 11. Controls the waveform data to be read only one way. On the other hand, the sustain part waveform of a limited number of cycles is stored in the memory 12.
．． 13, the waveform data of the attack section stored in the memory 12, 13 is read out once and then the waveform data of the sustain section is repeatedly read out in accordance with the address signal AD. 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. The decay envelope waveform when the key is released is.

As is well known, if the musical sound waveform in the sustain section has percussive volume attenuation envelope characteristics, this is to perform damp control when the key is released, while on the other hand, the musical sound waveform in the sustain section has envelope characteristics for sustained sounds. In this case (or when repeated readout results in a de facto sustained-tone envelope characteristic), the purpose is to attenuate the sound when the key is released.

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 encoded using the PCM method and stored. In that case, 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 using memory without particularly increasing the memory capacity.

Each of the waveform memories 12, 13 stores waveform data of the above-mentioned attack section and sustain section for each type of timbre selectable by the timbre selection device 28. The timbre selection [28] outputs timbre selection information TC indicating the selected timbre, and supplies this 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 the fifth ryI, 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. Also, the solid line shows an example of these functions corresponding to a piano tone,
The broken line shows an example of a stiffness function 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.

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, which controls 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 (1) corresponding to a strong touch.
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. To explain this point in a little more detail, the first and second waveform memories 12゜13 (
The same two series of waveform data (that is, the waveform data consisting of multiple periods of waveforms including an attack part without phase correction and a sustain part with phase correction) that were stored in the same way as described above (Fig. 1) are A phase matching operation is performed to prepare in advance, and one series of waveform data (for example, waveform data corresponding to a weak touch) is stored in the first waveform memory 12A.
to be memorized. Further, waveform data of a differential waveform corresponding to the difference between two series of waveform data prepared in advance is obtained by the phase operation as described above, and this is stored in the second waveform memory 13A.

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 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 The 0 weighting coefficient generating circuit 18A, which includes an adder 30 that adds the corresponding waveform data and the output of the multiplier 29, generates "1" as the weighting coefficient TK when the key touch is the strongest, and when the key touch is the strongest, When "0" is generated as TK, O<TK depending on the touch intensity during that time.
A weighting coefficient TK satisfying the condition <1 is generated according to a predetermined function. It is preferable that the functional characteristics of this weighting coefficient TK differ depending on the selected tone. In the example of FIG. 6, the addition ratio of the differential waveform data to the weak touch compatible waveform read from the first waveform memory 12A is The weighting circuit 15A is controlled according to the key touch strength, and as a result, similar to the embodiment shown in FIG. 1, waveform data having characteristics according to the touch strength is output from the weighting 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.

Incidentally, since the difference waveform stored in the memory 13A is the difference in amplitude value for each sample point between the waveform corresponding to a touch and the waveform corresponding to a weak touch, it is a spiky waveform with a large harmonic content. If this thorny difference waveform is added to the weak touch compatible waveform even at a small level, the resulting waveform may suddenly look different from the weak touch compatible waveform read from the memory 12A. There is a possibility that the waveform will be different from the waveform of the musical instrument performance sound. 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 This filter control is 1
%The weaker the touch, the rounder the difference waveform becomes in filter 3.
1, and 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 tone color. Furthermore, 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 musical tones to be generated, weighting coefficient generation circuits 18.18A (Figs. 1, 6, 7)
Instead of the touch detection data TD as the input data in the figure), the key code KC may be input as shown by the dotted line.

The key code KO 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 operation state of a predetermined operator 33 (FIG. 1), the 1 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, and the first and second waveform memories 12 and 13 in FIG.
and the weighting circuit 15.

In the waveform memory 12°H, 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 a strong key touch and a low pitch 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 weak key touches and low pitches 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 a desired pitch frequency according to the address signal AD.

Incidentally, among the waveform data stored in each waveform memory 12H112L, 13H, 13L, the waveform data of the sustain portion is phase-aligned between each series in the same manner as described above.

The waveform data corresponding to a strong key touch read out from the waveform memory 12H112L are respectively input to multipliers 33 and 34 for weighting for key scaling.

The other inputs of the multipliers 33 and 34 are input with two series of key scaling coefficients KSL and KS2 generated from the key scaling coefficient generation circuit 35 in accordance with the key code KC. Both waveform data for strong touch are weighted according to the pitch. The outputs of multipliers 33 and 34 are summed in adder 36, and then
It is applied to the multiplier 16, where it is 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 given to multipliers 37, 38, and key scaling coefficients KS3. Each is multiplied by KS4. 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 both multipliers 16, 17 are summed in adder 19 and applied to multiplier @24 (FIG. 1). In this way, the four series of waveform data having different characteristics read out from the waveform memories 12H to 13L are weighted according to both the pitch and key touch of the musical tone to be generated, and are weighted according to these timbre control factors. Waveform data to which a timbre change has been added is output from the weighting circuit 15B.

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.

In the example of FIG. 8, the weighting calculation for key scaling is performed and then the weighting calculation according to the key touch is performed, but this may be reversed. Furthermore, when combining timbre change control according to the operation state of the operator and timbre change control according to key touch or key scaling, the configuration may be similar to that shown in Fig. 8. It is also possible to combine all three of the child controls, and in that case, the configuration may be made 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.6 In the above embodiment, two series of waveform memories are provided for one timbre control factor. However, the number is not limited to this, and it may be three or more series. In that case, three or more series of waveform data may be weighted at the same time, but two series may be selected and weighted from among them. Good too.

Furthermore, in the above embodiment, it has been explained that the waveform memory that stores waveforms corresponding to predetermined timbre control states such as 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.
E (however, A, B, C, D, and E are predetermined address values in the relationship A<B<C<D<E). In that case, reading of each waveform data from each memory area 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.

Furthermore, the encoding format of the waveform data stored in the waveform memory is not limited to the above-mentioned PCM method, but also includes other methods such as differential PCM method, adaptive differential PCM method, delta modulation (DM) method, adaptive delta modulation (ADM) method, etc. An appropriate waveform encoding format may be used. In that case, a decoding circuit suitable for the encoding format is provided in the subsequent stage of the waveform memory, and the encoding format of the waveform data read from the memory is returned to the PCM format (decoding). It is better to do this.

Further, the multi-period waveform of the attack portion stored in the waveform memory may consist not only of continuous plural periods but also of discontinuous plural periods.

For example, the attack part of a musical tone may be divided into multiple frames, and only one or two representative periods of waveform data may be stored for each frame, and this waveform data may be read out repeatedly while being sequentially switched. Furthermore, if necessary, at the time of this waveform switching, the previous waveform and the next new waveform may be interpolated to form waveform data that changes smoothly.

〔Effect of the invention〕

As described above, according to the present invention, waveform data of a plurality of periods consisting of an attack part and a sustain part regarding a plurality of series of waveforms having different characteristics are stored in a memory, and based on the waveform data of each series read from the memory. Since the obtained waveform signals are appropriately weighted and synthesized according to the weighting control data, timbre change control is performed according to the weighting, so that it is possible to obtain a high-quality musical tone signal, and The timbre of this high-quality musical tone signal can be delicately controlled 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 the present invention, when waveform signals based on weighted multiple series of waveform data are synthesized, each series is Since phase manipulation was performed in advance to match the phase of the waveform data in the sustain section as much as possible, and the phase-manipulated waveform data was stored in memory, problems caused by this are particularly noticeable when synthesized with a phase shift. This can eliminate such inconveniences that often occur in the sustain section. Furthermore, the phase matching operation of waveform data between a plurality of series in the sustain section can be performed relatively easily, which is also advantageous in this respect.

According to a second feature of the present invention, only one of the two series of waveform data whose phase has been manipulated in advance regarding the sustain portion is stored in the memory, and the waveform data of the difference waveform of both series is stored in the memory, A musical tone signal is obtained by suitably weighting the waveform signal obtained based on the waveform data of the differential waveform read from the memory and combining it with the waveform signal obtained based on one series of waveform data read from the memory. Therefore, in addition to the above-mentioned effects, the memory capacity can be saved by storing the difference waveform, compared to the case where two series of waveform data are stored as they are.

[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 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. 51! l is a graph showing an example of a function of a weighting coefficient; FIG. 6 is a block diagram showing a modification of the waveform memory and weighting circuit in FIG. 1; FIG. 7 is a block diagram showing a modification of FIG. 6; FIG. 8 is a block diagram showing an example of a modification of the waveform memory and weighting circuit of FIG. 1 when a plurality of timbre control factors are combined to create a timbre change. 10...Keyboard circuit, 11...Address signal generation circuit, 12.12A, 12H112L, 13.13A, 13
H513L...Waveform memory, 15.15A, 15B.
...Weighting circuit, 18.18A... Weighting coefficient generation circuit, 21... Touch detection device, 33... Operator, 35.39... Key scaling coefficient generation circuit.

Claims (1)

[Claims] 1. With respect to a plurality of series of waveforms having different characteristics, waveform data of a plurality of periods each consisting of an attack part and a sustain part are stored, and the waveform data of the sustain part is approximately equal between each series. a waveform storage means in which at least one series is stored in a phase-manipulated state so that the phases match; a readout means for reading out the waveform data regarding the plurality of series of waveforms from the waveform storage means; weighting synthesis means for weighting and synthesizing waveform signals of the plurality of series of waveforms obtained based on the waveform data according to weighting control data and outputting the synthesized signals as musical tone signals; and generating the weighting control data. A musical tone signal generating device, comprising: weighting control data generating means for generating weighted control data; 2. The weighting control data generation means is configured to control the weighting control for instructing different weighting contents depending on the intensity of a touch applied to a key pressed on a keyboard for specifying a pitch of a 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. The musical tone signal is a musical tone signal of a rhythm tone, 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. For at least one of two series of original waveforms having different characteristics including an attack part and a sustain part, the phase of the multi-period waveform of the sustain part is manipulated in the direction of reducing the mutual phase shift. In this way, waveform data consisting of a multi-cycle waveform including an attack part without phase correction and a sustain part with phase correction is prepared, and a difference waveform corresponding to the difference between the two prepared waveform data series is prepared. a waveform storage for preparing waveform data, storing one series of waveform data of the two prepared series of waveform data as first waveform data, and storing the waveform data of the difference waveform as second waveform data; means for reading out the first and second waveform data from the waveform storage means, and weighting a waveform signal obtained based on the read out second waveform data according to weighting control data. weighting synthesis means for synthesizing the signal with a waveform signal obtained based on the first waveform data read out after weighting and outputting the signal as a musical tone signal; and weighting control data generation for generating the weighting control data. A musical tone signal generating device comprising means. 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.