JPS6361296A - Electronic musical instrument - Google Patents

Abstract

(57) [Abstract] 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 an electronic musical instrument in which a desired musical sound waveform is obtained by controlling the level of harmonic coefficients and synthesizing them, and in which the harmonic coefficients can be easily controlled. .

[Conventional technology and problems]

Conventionally, electronic musical instruments have been widely used to obtain a desired musical sound waveform by performing Fourier synthesis calculations based on harmonic coefficients.

In this case, there are two methods for scaling the harmonic coefficients, that is, controlling the level of the harmonic coefficients.

The first method is to temporally change the formant filter characteristics that form formants. A scaling method is used. The first method controls the components of the desired musical tone as a total combination, so
The overall characteristics of the desired musical tone can be expressed. However, the details are not enough. In other words, although it is suitable for musical tones that match the characteristics of the 7-ormantic characteristics, it is insufficient for musical sounds that do not match the characteristics of the 7-ormantic characteristics. For example, it is unsuitable for musical tones in which only certain harmonic components are particularly emphasized.

On the other hand, since the second method controls each harmonic component, the waveform synthesized thereby is sufficiently close to the desired musical tone. However, this method requires an envelope generator to control each of the harmonic components, which increases configuration, control and processing time and is very uneconomical.

Figure 4 shows the patent application filed in 1986-737 filed by the present applicant.
An example of a proposal for No. 00 "Electronic Musical Instruments" is shown, in which Fourier synthesis calculations are performed based on harmonic coefficients, and the above-mentioned first 7-ormant filter characteristics are used as a method of scaling these harmonic coefficients. be.

A musical tone generation system 100 shown in the figure shows an embodiment that generates a desired musical tone using a general Fourier synthesis method.

The key/tablet assigner 102 scans the key/tablet switch #101, detects ON/OFF of the switches included in the key/tablet switch group 101, touch response of the key switch, etc. contains information about each switch. The information is then sent to the control circuit 103 that controls the system 100.

The control circuit 103 receives the information sent from the key/tablet assigner 102 and calculates the Fourier synthesis equation (1) shown below. v! 4-wave coefficient FQ * 9th-order wave coefficient 2; A synthesized waveform is stored in the main memory 110 based on the sampling value. To explain the procedure tl-i, the control circuit 103
The harmonic coefficient Cq of the desired timbre is read out from the harmonic coefficient memory 108 using the following signal. On the other hand, the harmonic order is The scaling value generator 1 generates a scaling value Fq which is indicated as a level control value of the harmonic coefficient corresponding to q.
Output from 05. Then, a multiplier 107 multiplies the harmonic coefficient Cq and the scaling value Fq to obtain a harmonic coefficient Cq' scaled by the scaling value Fq. A sine wave function table 10 is created using the harmonic coefficient Cq' obtained from the multiplier 107 and the signal from the control circuit 103.
The multiplier 106 multiplies the 9th order sine wave value 5IN-;- read from 4.

The main memo is that the multiplied value from the multiplier 106 is accumulated by the accumulator 109 and the synthesized waveform shown in equation (1) is shown! 7110(
/c The cultivated soil is lifted and stored.

Next, the synthesized waveform stored in the main memory 110 is stored in the tone memories 112-1 to 112-m corresponding to the keys (m means there are multiple ones, but it is clear that they can be time-divided into one configuration. a tone frequency information generator 11 that is transmitted to at least one of the keys) through a transfer selection circuit 111 and similarly generates tone frequency information corresponding to the key.
The tone frequency information from No. 3 is read out from the corresponding tone memory without affecting waveform synthesis. The data read out corresponding to the scale from the tone memories 112-1 to 112-m is an envelope output waveform from an envelope generator 115 that outputs an envelope waveform in response to a key press, and an envelope output waveform from the multipliers 114-1 to 114-m. 114-? It is multiplied by X and becomes musical waveform data with an envelope added. The musical sound waveform data from the multipliers 114-1 to 114-m are converted into analog musical sound waveforms by the organ converters 116-1 to 116-m, and then supplied to the sound system 117, from which a desired musical tone is obtained. It will be done.

The main part of the proposed example related to the present invention is the scaling value generator 105. The harmonic order q, cutoff order qa, and filter level Hα necessary for waveform configuration are set and inputted from inputs such as ADSR, touch information, and timbre information to obtain desired formant filter characteristics.

Since such formant filter characteristics have the disadvantage that they do not necessarily match the characteristics of musical tones as described above, the inventors of the present invention have made the function of scaling harmonic components one by one common to the proposed example, and the second We considered simplifying the configuration using the following method.

That is, if we focus on the temporal changes of each harmonic (harmonic overtone) forming a musical tone, that is, the corresponding envelope, we can see that several harmonics change in the same way over time. Therefore, by grouping (grooving) these things that change in the same way over time, we can generate fewer envelopes than the number of harmonic orders, select the envelope for each harmonic order, and select We considered using the resulting envelope as the scaling value of the harmonic component.

SUMMARY OF THE INVENTION An object of the present invention is to provide an electronic musical instrument that has a function of scaling harmonic coefficients and generates an envelope smaller than the harmonic order as a scaling value.

[Means for solving problems]

To achieve the above object, the electronic musical instrument of the present invention is an electronic musical instrument that synthesizes each Oka harmonic component for each harmonic order by controlling the level to obtain a desired musical tone waveform. an envelope forming means for forming an envelope, a means for generating a selection code set according to timbre information for each of the harmonics and orders, and generating an envelope from the envelope forming means in accordance with the selection code from the selection code generation means. Means (i
l-It is equipped with.

[For production]

With the above configuration, fewer envelopes than the number of harmonic orders are generated, and therefore a common envelope is selected for some harmonic orders and output as a scaling value. As a result, a musical tone close to the desired one can be obtained, and the number of envelope generators can be reduced, thereby simplifying the configuration and control.

〔Example〕

FIG. 1 is an explanatory diagram of the configuration of an embodiment of the present invention.

The difference between the figure and FIG. 4 is that, in place of the scaling value generator 105, a harmonic envelope generator 200 for inputting touch information and timbre information is provided. That is, it inputs touch information indicating initial and aftertouch responses and tone color information indicating a selected tone, and outputs a harmonic envelope coefficient HEq for scaling the harmonic coefficient. and the harmonic coefficient C and the harmonic envelope coefficient HEqt-multiplier 10
7 to obtain the harmonic coefficient Cq' scaled by the harmonic envelope coefficient HEq. This is the understatement explained in the configuration of FIG. 4 below.

FIGS. 2(α) to 2(C) are detailed explanatory diagrams of main parts of the embodiment.

Figure 2 (α) is the harmonic envelope generator 20 of Figure 1.
0 is a detailed explanatory diagram of 0. Envelope Mesori 201-1
~ 201-p uses a read address signal from a read address signal generator (not specified) that generates a read address signal depending on the state from key depression to key release.
This is the memory from which the envelope curve is read out at the same time.

Here, p means that there is a plurality of harmonics, and the value of p is smaller than the harmonic order (number) W. Envelope memo! The outputs of J 201-1 to 201-p are each input to the data selection circuit 202. Data selection circuit 202
is a selection code memory 20 whose address is the harmonic order.
Based on the group code signal (GC) read from 6, envelope memo I) 201-1 to 201-7
) is selected and output as one input of the multiplier 205. The other input of multiplier 205 is the output from gate 204. The output of gate 204 is sent to multiplier 205
, the pEpTH signal for scaling the envelope selected by the data selection circuit 202 is gated by the DEP 0N10FF signal from the selection code memory 203 whose address input is the harmonic order. When Tsumushi, Dk:, P0N10FF is ON, the selected envelope curve is the envelope curve of the amount scaled to the DEPTH signal.
In the case of FF, the selected envelope curve remains unchanged without being scaled by the DEPTH signal. This is shown in FIG. 2Cb). ■ in the same figure is the envelope curve selected by the data selector 202, p, ■ in the same figure,
■ is the output of the multiplier 205 when DEP is ON and DEP
It is shown that the envelope level changes when it is OFF. Further, if the DEPTH signal for scaling the selected envelope is, for example, a signal from key touch information, a touch response can be given to any envelope. This means that each harmonic coefficient Cq is scaled by the harmonic envelope signal HEq from the multiplier 205 in the multiplier 107 in FIG. Cq can be scaled.

Select code memo! / 203, although only one is disclosed in Figure 2 (cL), as shown in Figure 2 d (c), one
~I have plural selection code memo I) 401
-1 to 401-(data selector 40 whose input is the output of
In step 2, a signal for selecting an envelope can be generated by selecting based on the tone information of the selected tablet. Further, as shown in FIG. 2 (α), even if only one is disclosed, 5A can be easily realized if there is a means (not explicitly shown) for rewriting the contents using the timbre fW information.

FIG. 6 is an explanatory diagram of another circuit example of the harmonic envelope generator 200 of FIG. 4. A control signal from the harmonic emperof calculation control 304 causes p (
The envelope amplitude value that changes over time from the envelope of the envelope (p here has the same meaning as that in Figure 2 (α), so it is assumed to be the same) is stored in the harmonic envelope memory device 6.
Calculate the envelope amplitude using 01 and then calculate the envelope amplitude using
Velope memo') Store in 302. Harmonic envelope memo! , l 302 is the area indicated by the address signal WA of the harmonic envelope calculation control 504 color supplied via the address selector 503. Here, it is 01, WAlp-1 (assuming it starts at address 10''.Harmonic envelope memo')
The envelope stored in D 302 is read out using the same configuration with the same number as in FIG.
It is multiplied by EPTH'e and becomes an input to the multiplier 107 shown in FIG.

As disclosed above in FIG. 2 (α) and FIG. 3, the present invention has fewer envelopes than the number of harmonics, and selects an arbitrary one for each harmonic order to calculate the harmonic coefficient. It is used as a scaling value for scaling.

〔Effect of the invention〕

As explained above, according to the present invention, a method of scaling harmonic coefficients is used, and an envelope smaller than the number of harmonic orders is generated, and this is selected in the high and A wave order ranges to obtain a scaling value. Output as . This p
It is possible to obtain a tone close to the original musical tone, and also to reduce the number of envelope generators, thereby simplifying the configuration and processing.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of the configuration of an embodiment of the present invention, Fig. 2 (cL)
~(c) is a detailed explanatory diagram of the main part of the embodiment, FIG. 3 is an explanatory diagram of another circuit example of the main part of the embodiment, and FIG. 4 is an explanatory diagram of the configuration of the conventional proposed example. A musical sound generation system, 101 is a key/tablet switch group, 102 is a key/tablet retainer, 103 is a control circuit, 104 is a sine wave function table, 10 (5, 107 is a multiplier, 108 is a harmonic coefficient memory, 200 is a High 14 wave F to C1-Near' J1 [, 201-1 to 201-7) is envelope memory, 202 is data selection circuit, 203 is selection code memory, 204 is gate, 205 is multiplier, 301 is harmonic envelope 302 is a harmonic envelope memory, 303 is an address selector, and 304 is a harmonic envelope calculation control. Patent Applicant: Kawai Musical Instruments Urasakusho Co., Ltd. Agent Patent Attorney 1) Yoshishige Saka (b) DEP Tl (Explanatory Diagram (・) Multiple Choice - Tonomori (Detailed Explanatory Diagram of the Main Parts of the 2031 Implementation Test) Figure 2 Harmonics Other circuit side explanatory diagram of the main part of the actual order examples Fig. 6

Claims (2)

[Claims] (1) An electronic musical instrument that synthesizes each harmonic component for each harmonic order by level control to obtain a desired musical sound waveform, comprising an envelope forming means for forming a number of envelopes smaller than the number of harmonic orders, and each of the harmonic orders. and means for generating an envelope from the envelope forming means in accordance with the selection code from the selection code generation means, and generating a high pitch with the generated envelope. An electronic musical instrument characterized by scaling each wave order and controlling each harmonic component value. (2) Claim (1) characterized in that the envelope forming means comprises means for calculating an envelope of a number smaller than the harmonic order, and a memory means for storing the envelope from the calculating means. Electronic musical instruments listed in section.