JPS6044674B2 - Musical sound data processing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a musical tone data processing device that detects a change in the state of a tone selection (control) switch such as a tablet or drawbar that selects or controls musical tones in an electronic musical instrument, and obtains a musical sound waveform according to the state. There are things.

Conventionally, tone color selection switches used have the function of a gate circuit, which opens and closes a musical sound waveform formed into a predetermined waveform.

However, in recent years, with the development of electronic musical instruments using digital processing, the present applicant and others have proposed a method of calculating a musical sound waveform in response to changes in the state of a tablet, drawbar, etc. For example, the method is to detect a change in the state of a tablet switch, and when a change occurs, add the tone waveforms of each tablet switch that is on according to the new state of the tablet switch to obtain a synthesized tone waveform. . In the case of drawbars as well, a synthesized musical sound waveform is obtained by multiplying and adding the sine waveform by level coefficients corresponding to each level of the drawbars. However, in such a method, as the number of tablet switches or drawbars increases, the calculation time becomes longer, and the response of changes in musical waveforms to changes in these tone selection (control) switches becomes slower. In addition, calculations are performed using information processing equipment (C
If the calculation is executed on a CPU (PU), the calculation will occupy the CPU for a long time, and other processing will be delayed.

SUMMARY OF THE INVENTION An object of the present invention is to provide a musical tone data processing apparatus capable of processing music/sound waveforms synthesized in a short time in response to changes in the status of switches for selecting or controlling tone colors.

In order to achieve the above object, the musical tone data processing device of the present invention includes a switch for selecting or controlling a tone color (hereinafter referred to as a tone color switch).

), the musical tone data processing device recalculates the musical sound waveform of each tone switch to obtain a synthesized musical sound waveform in response to a change in the state of the tone switch, and a memory for storing data of the state before the change in response to a change in the state of the tone switch. The present invention is characterized by comprising a circuit and a device that calculates a waveform of a data difference due to the change in the state and adds or subtracts it to or from the musical sound waveform that is being produced. The present invention will be described in detail below with reference to examples.

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

In the figure, a tone color selection (control) switch 1 is divided into several programs depending on the tone color series of the tablet switch and the drawbar. This tone color selection (control) switch 1 and various memories 5, 6, 71 to 73 are connected to a common bus 8, and the on/off information of the switches is transmitted from the tone color selection (control) switch 1 to the information processing section (CP).
The input/output is controlled by U) 3 according to the control program 4. In this case, addresses are assigned to each section other than the CPU 3 by the address designation circuit 2. The program data memory 5 is a memory that stores the old data before the change in the state of each program of the tone selection (control) switch 1. Detected by comparison. The musical tone waveform memory 6 is a memory for storing musical tone waveforms assigned to each switch of the tone color selection (control) switch 1. Waveform readout memories A7l, B72, C73 are block A,
There is a memory for storing new waveforms of musical tone waveforms synthesized according to the states of switches B and C. In this configuration, the status of the switches in each block of the tone selection (control) switch 1 is constantly checked by the CPU 3, and new data due to a change in status within a certain program is transferred from old data stored in the program data memory 5. When a change in the state of the switch is detected by comparing with the state of the switch, a new waveform corresponding to the state of the switch is calculated, and the new waveform is transferred and stored in the waveform readout memories 71 to 73 corresponding to the link, and is synthesized. You can read out musical sound waveforms.

FIG. 2 shows a tablet switch which has two states, on and off, among the timbre selection switches, and FIG. 3 shows a drawbar one circuit which has nine levels among the timbre control switches.

If the number of parallel processing bits of the CPU 3 in FIG. 3 in correspondence with logic level signals
It is connected via a state gate circuit 12.

In the case of a tablet switch, the programs are divided according to the tone series, but here the tone series is a grouping of the same type of tones on an electronic musical instrument, for example, flute, string, lead, plus. There are various classification methods, types, and names. These musical tones of the same tone color series are produced as one synthesized musical sound waveform. 1 for each tone series.
The address of a certain block is assigned to line 11 by the addressing circuit 2 of FIG.
When readout is specified, the on/off signal of the tablet switch of the program is transmitted to the CP via the common bus bar 13.
Read by U3. In the case of one drawer in FIG. 3, one block is assigned to all the drawers 21,
Signals of ゜゜1゛, ゜“0゛, which indicate the level of each drawbar ←, are specified by an address designation signal via a 3-state gate circuit 12, and are connected to a common bus bar 13, and are connected to a CPU.
3.

Now, if we assume that the addresses of the seven blocks of the tone selection (control) switch 1 shown in FIGS. The data of each block is stored in addresses <130> to <150> according to the address.

FIG. 4 is a flowchart showing the operation of the CPU 3, which is the main part of this embodiment.

This will be explained below with reference to FIG. First, after start 1, in event check programs 2 to 5, address 100> is read out, and address 130> is read out.
data is read out, both data are compared, and if they match, then address <101> and address <131> are read out and compared, and if they match, then address <102> and address <132> are read out. Read and compared.

In this way, the data in addresses 100> to 120> and the data in addresses 130 to 150> are sequentially compared, and the comparison is repeated.
If there is data that does not match as a result of the comparison, it is detected that a change has occurred in the state of the timbre selection switch 1 in the block at the address. Then, in instruction 6, it is detected from the address whether the program in question is a tablet switch block or a drawer 1 block, and if it is a tablet block, the program advances to instruction 7 and below, and if it is a drawbar 1 block, it advances to instruction 16 and below. First, in the case of a tablet, in instruction 7, data (hereinafter referred to as old data) in the block data memory 5 of FIG. 1 corresponding to the block in question is executed.

) and the data of tone selection switch 1 corresponding to the program (hereinafter referred to as new data), by calculating the exclusive OR (EXOR) for each bit, the bits that do not match, that is, the bits that have changed, are Detected.
In instruction 8, the changed bits are sequentially converted into tablet codes for the tablet switches corresponding to the bits and stored in a general-purpose register in the CPU 3. Under normal usage conditions, it is unlikely that two or more tablet switches change in exactly the same way, but if two or more tablet switches change, the CPU
The tablet codes in the third general-purpose registers are processed one by one in order. The musical waveform memory 4 stores waveforms for each tablet using the respective tablet codes as addresses.

In addition, waveform readout memories 71 to 7 provided for each block.
3, the musical sound waveform being produced is added and stored.
In instruction 9, the waveform readout memory 7 of the relevant block is
At instruction 10, the tone waveforms are read out from the tone waveform memory 6 using the tablet code in the general-purpose register. Instruction 11 checks the bits of new data that have changed in the detection of changed bits in instruction 7. "1" indicates that the tablet switch has changed from off to on, and "0" indicates that the tablet switch has changed from on to off. As a result, if it is ゜゜1゛, the process goes to instruction 12, and if it is ``゜0゜, it goes to instruction 13.In command 12, the tone waveforms from the waveform readout memories 51 to 53 are inputted to the corresponding tablet code from the tone waveform memory 6. The corresponding tone waveforms are added. Also, in instruction 13, the tone waveform corresponding to the tablet code read from the tone waveform memory 6 is subtracted from the tone waveforms stored in the waveform reading memories 71 to 73. Alternatively, the subtracted waveform is transferred to and stored in the waveform read memories 71 to 73 of the relevant block by instruction 14. Then, by instruction 15, it is checked whether the tablet code of the changed bit still remains in the general-purpose register. If so, the same type of processing as the instruction 9 and subsequent instructions is repeated.
If there is no tablet code, the program proceeds to instruction 24, writes new data to the address of the old data in the block data memory 5, and then returns to the first event check program. Next, moving to the case of one drawbar, in instruction 16,
The old data is subtracted from the new data for the data at the address where the change occurred in the first drawbar block.

As shown in Figure 3, the drawbar lines 12 and busbar lines 13 are connected in an array with the higher level toward the MSB and the lower level toward the LSB, so the result is correct when subtracting data. If the level is negative, it indicates that the level has increased; if the level is negative, it indicates that the level has decreased. In instruction 17, the code resulting from the subtraction is changed to the value of the difference in volume level, and in instruction 18, the difference is multiplied by the sine waveform. In command 19, musical sound waveforms are read out from the waveform readout memories 71 to 73 corresponding to the seven blocks of the first drawbar. In instruction 20, it is determined whether the result of the data subtraction in instruction 16 is positive or negative. Based on this result, if it is positive or increment, instruction 2
1, and if negative or decrement, go to instruction 22. command 2
1, the sine waveform multiplied by the difference is added to the musical tone waveform from the waveform reading memories 71 to 73 of the first drawbar read out in command 19. Further, in instruction 22, the sine waveform multiplied by the difference is subtracted from the musical tone waveform read out in instruction 19 from the waveform reading memories 71 to 73 of the first drawbar.

- The musical tone waveform added or subtracted by instruction 21 or 22 is transferred to the waveform reading memories 71 to 73 of the first drawbar in instruction 23, and new data is written to the address of the old data in instruction 24, resulting in a new synthesized musical tone waveform. is converted to ) The advantages of the musical tone data processing device according to the present invention will be explained using a tablet as an example. For example, among the eight switches T1 to T8 belonging to a certain block, Tl, T2, T3, T5, T7 are on, T4, T6
, T8 are off and T6 is newly turned on. Each tablet switch T1 to T8
If the musical sound waveforms corresponding to D1 to D8 are D1 to D8, conventionally, the first
Stage D1 2nd stage D1+D2 3rd stage D1+D2+D3 4th stage D1+D2+D3+D5 5th stage D1+D2+D3+D5+D6 6th stage D
Addition was performed in six steps: 1+D2+D3+D5+D6+D7.

However, according to the invention, the first stage D1+D2+D3+
D5+D7 2nd stage D1+D2+D3+D5+D7+
It can be added in two steps of D6.

As another example, among tablet switches, Tl, T
2, T3, T5, T7 are on, T4, T6, T8
Conventionally, if T3 changes to the off state when T3 is off, the first
Four stages are required: stage D1, second stage D1+D2, third stage D1+D2+D, and fourth stage D1+D2+D5+D7, but according to the present invention, the first stage D
1+D2+D3+D5+D7 2nd stage D1+D2+D
The process is completed in two steps: 3+D5+D7-D3 (=D1+D2+D5+D7).

In this way, the calculation time is shortened because the calculation is completed in two stages for a change in one tablet.

A similar effect is obtained in the case of one drawbar. Conventionally, changes in musical waveforms in response to changes in the state of a timbre switch in a musical sound data processing device have been calculated for all waveforms, but in the present invention, calculations are made only for the program that includes the timbre switch whose state has changed. Since it is only necessary to perform the calculation in two steps, the calculation time can be further reduced in this respect as well.

Also, since it does not affect the waveforms of other blocks, it has the advantage of allowing smooth changes in musical tones. As described above, according to the present invention, the apparatus includes a device that calculates the difference waveform between old and new data when the state of the tone selection (control) switch changes, and adds or subtracts it from the musical sound waveform currently being produced. In this embodiment, this device is realized by a CPU.

Therefore, the use of a CPU is not a necessary condition, but it is easily possible to extend equivalent functions by changing the program, and with the recent development of microcomputers, miniaturization and large-scale integrated circuits ( Since it can be easily implemented as an LSI, it is possible to obtain a musical tone data processing device that has a wide range of applications and is inexpensive.

[Brief explanation of drawings]

FIG. 1 is a schematic explanatory diagram showing the configuration of an embodiment of the present invention, and FIG.
3 is a detailed explanatory diagram of the main part of the embodiment shown in FIG.
The figure is a flowchart showing the operation of the main parts of the embodiment of FIG.
In the figure, 1 is a tone selection (control) switch, 2 is an address designation circuit, 3 is an information processing unit (CPU), 4 is a control program memory, 5 is a program data memory, and 6 is a musical waveform memo (871 to 73). . . . indicates a waveform read memory, and 8 indicates a common bus.

Claims (1)

[Claims] 1. A musical sound data processing device that recalculates the musical sound waveform of each timbre switch in response to a change in the state of a switch that selects or controls a timbre (hereinafter referred to as a timbre switch) and obtains a synthesized musical sound waveform, A storage circuit that stores data in a state before the change in the state of the tone switch, and a device that calculates a waveform of a difference in data due to the change in state and adds or subtracts it to or from the musical sound waveform that is being produced. A musical sound data processing device characterized by: 2. The scope of claims characterized in that the tone switch is divided into blocks for each tone color series with a specified address, and means is provided for deforming the musical waveform of only the block including the tone switch whose state has changed. 1st
The musical sound data processing device described in Section 1.