JPH0926788A - Device and method for setting parameter of musical sound synthesizing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a parameter setting device and method for musical sound synthesizing device which can obtain a maximum output within a range wherein an overflow does not occur when parameters determining a timbre are changed. SOLUTION: When the timbre parameters are changed and an instruction for overflow check is given, the gain parameter ODGAIN determining the level of a waveform signal inputted to an excitation waveform processing part 13 is lowered in value to an extent where no overflow can be caused, and then increased by a specific quantity and an adder 15 checks whether or not an overflow has been caused over the hole pitch range of sound generation. If the overflow has been caused, the value right before that is stored as determined value of the gain parameter ODGAIN.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a musical tone synthesizing apparatus used for electronic musical instruments, game machines, computers and its applied equipment, and more particularly to musical tone synthesizing having a loop portion for delaying a musical tone signal and adding it to the original signal. The present invention relates to a device parameter setting device and method.

[0002]

2. Description of the Related Art A tone synthesizer for generating a desired tone signal by using a loop circuit including a delay circuit and adding a delayed signal subjected to a predetermined process and an original signal has been known. (For example, Japanese Patent Publication No. 58-48109). In such a musical sound synthesizing device, a musical tone signal that changes in a complicated manner with time can be easily obtained by appropriately changing the musical tone parameters.

[0003]

However, in the above-mentioned conventional tone synthesizer, variation in volume occurs even if the parameter for determining the tone color is changed, and overflow occurs in the addition operation of the delay signal and the original signal. There was an occasion. When such an overflow increases, the sound quality is adversely affected, but it is difficult to predict the occurrence of the overflow because the frequency characteristics of the input signal and the parameters of the loop circuit affect each other in a complicated manner.

On the other hand, if the gain of the tone synthesizer is set so that overflow will never occur, the S / N ratio of the finally obtained tone will deteriorate.

The present invention has been made by paying attention to the above-mentioned points, and a parameter setting device of a musical tone synthesizing device capable of obtaining a maximum output in a range in which overflow does not occur when a parameter for determining a tone color is changed. And to provide a method.

[0006]

In order to achieve the above object, the present invention provides a parameter of a tone synthesizer having tone signal generating means for performing a predetermined arithmetic processing based on a plurality of tone parameters to generate a tone signal. In the setting device, the value of a predetermined musical tone parameter is sequentially changed and supplied to the musical tone signal generating means, and the control means for instructing the generation of the musical tone signal, and the overflow in the arithmetic processing in the musical tone signal generating means are generated. A detection means for detecting and a storage means for storing the value of the predetermined tone parameter supplied to the tone signal generation means immediately before the detection as a determined value when the overflow is detected. It was done.

Further, according to the present invention, in a parameter setting method of a musical tone synthesizing apparatus having a musical tone signal generating means for performing a predetermined arithmetic processing based on a plurality of musical tone parameters to generate a musical tone signal, a predetermined musical tone parameter value is set. When the overflow is detected, when the overflow is detected in the arithmetic processing in the tone signal generating means, the overflow detection is detected, and the detection is performed when the overflow is detected. The value of the predetermined tone parameter supplied to the tone signal generating means immediately before is stored as a determined value.

According to the present invention, the value of a predetermined tone parameter is sequentially changed to generate a tone signal, and when an overflow is detected, the parameter value immediately before the detection is stored as a decision value. .

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of a musical sound synthesizing apparatus according to an embodiment of the present invention.
The performer performs a performance operation, for example, a performance operator 1 such as a keyboard, a setting operator 2 for performing a tone color setting, a tone parameter editing operation, an overflow check execution instruction to be described later, and the like of the entire apparatus. CPU3 for controlling and C
A ROM 4 in which programs executed by the PU 3 and tables necessary for executing the programs are stored, a display unit 5 for displaying timbres, timbre parameters, overflow check results described later, and the like, and a working area of the CPU 3 and editing of timbre parameters. RAM6 which is used as an edit buffer to store the tone color parameters
And a micro program memory, CPU3 or R
A DSP (Digital Signal Processor) 7 for generating a tone signal corresponding to a tone parameter supplied from the AM 6,
DSP connected to DSP7 and used for signal delay
A RAM 8 and a DA converter 9 for converting a digital musical tone signal output from the DSP 7 into an analog musical tone signal;
A multiplier 10 that multiplies the output signal of the DA converter 9 by the volume parameter VOL supplied from the CPU 3 and outputs the product, and a bus 21 that interconnects the above-described components 1 to 7 and 10 are provided.

As shown in FIG. 2, the RAM 6 includes a CPU working area 6a, an edit buffer 6b used for editing tone color data, and tone color data VOICEDATA.
Area 6c for storing 1, VOICEDATA 2 ,. In the CPU working area 6a, for example, control parameters GAINCOMP, TESTKC, etc., which will be described later, are stored.

FIG. 3 is a functional block diagram of the DSP 7 and the DSP-RAM 8, in which the excitation waveform generator 1 is shown.
1 is a pitch parameter PITCH that represents a pitch, and a touch parameter TO that represents a touch (for example, the key pressing speed of the keyboard).
Waveform parameter WAVE that specifies UCH and excitation waveform
Is entered. The excitation waveform generator 11 generates a waveform signal according to these parameters and inputs it to the first multiplier 12. The first multiplier 12 applies the first gain parameter ODGAI to the waveform signal input from the excitation waveform generator 11.
It is multiplied by N and input to the excitation waveform processing unit 13.

The excitation waveform processing unit 13 has a pitch parameter PITCH, a touch parameter TOUCH, and other musical tone parameters (for example, parameters representing nonlinear input / output characteristics as shown in the figure, filter coefficients, etc.) PARAM
ETER1 is input, and the excitation waveform processing unit 13 processes the input waveform signal according to these tone parameters and inputs it to the second multiplier 14. The second multiplier 14 multiplies the waveform signal input from the excitation waveform processing unit 13 by the second gain parameter INGAIN, and inputs the result to the adder 15.

The delay signal is input to the adder 15 from the third multiplier 18, and the adder 15 performs addition processing on the signals from the second multiplier 14 and the third multiplier 18 to process the loop cyclic signal. Input to the section 16. The overflow check, which will be described later, checks whether or not an overflow has occurred in the adder 15, and is determined by the presence or absence of a carry (OVRFLW) of the most significant digit of the adder 15, for example.

The loop cyclic signal processing unit 16 includes a pitch parameter PITCH, a touch parameter TOUCH, and other musical tone parameters (for example, a parameter representing a nonlinear input / output characteristic, a filter coefficient, etc.) PARAMETER
2 is input, the loop cyclic signal processing unit 16 processes the input waveform signal according to these musical tone parameters, outputs the processed waveform signal as the output waveform signal of the DSP 7, and inputs it to the delay unit 17. .

The delay unit 17 has a pitch parameter PITC.
H and a modulation parameter M for modulating the delay time
ODURATION is input, and the delay unit 17 delays the input signal according to these parameters,
Input to the third multiplier 18. The third multiplier 18 is a loop gain parameter LPGAIN representing the gain of the delayed signal.
Is multiplied by the input signal and input to the adder 15.

Of the musical tone parameters described above, except for the pitch parameter PITCH and the touch parameter TOUCH, which are the performance parameters that change depending on the performance operation of the performer, the CPU 3 directly or from the edit buffer 6b of the RAM 6 in response to an instruction from the CPU 3. Supplied.

DSP composed of the functional blocks described above
According to 9, the generation of the waveform signal, the gain adjustment and the primary processing are performed in the preceding stage of the loop portion, and the secondary processing and the pitch of the musical tone are determined in the loop portion. Here, the pitch is determined by changing the delay time of the delay unit 17.

FIG. 4 is a flow chart of the main program executed by the CPU 3.

First, when the power is turned on, various parameters are initialized (step S1), and then a performance or setting operation event for the performance operator 1 or the setting operator 2 is detected (step S2). Then, it is confirmed whether the set mode is the normal mode or the edit mode (step S3), and it is determined whether the mode is the edit mode (step S4). As a result, in the normal mode, the tone color selection processing according to the setting state of the setting operator 2 is performed, and the selected tone color data VOICEDATA
Ax is transferred to the edit buffer 6b (step S
6), and proceed to step S7.

On the other hand, in the edit mode, parameter edit processing shown in FIGS.
5), and proceeds to step S7.

In step S7, the edit buffer 6
Sound generation processing is performed based on the tone color data VOICEDATAx stored in b. More specifically, the CPU
In accordance with the instruction of 3, the musical tone parameters in the edit buffer 6b are transferred to the DSP 9 and sounded in accordance with the performance event. Then, other processing is performed (step S
8) Return to step S2, and then repeat steps S2 to S8.

FIG. 5 is a flow chart showing in detail the procedure of the parameter editing process in step S5 of FIG. In the figure, first in step S11, it is checked whether or not a parameter change operation event has occurred, and then, as a result of the check, it is determined whether or not there is a change event (step S12). Then, if there is no change event, this process is immediately terminated and the process returns to the process of FIG. 4. On the other hand, when there is a change event, the parameters of each part shown in FIG. 3 are changed and changed according to the editing operation. A parameter changing process of storing the parameter in the corresponding address of the edit buffer 2b is performed (step S13).

In a succeeding step S14, it is determined whether or not an overflow check mode for checking whether or not an overflow occurs in the adder 15 of FIG. 3 with the changed parameter setting is turned on, and if it is not turned on, immediately. This process ends and the process returns to the process of FIG.

When the overflow check mode is turned on, the correction amount GAINCOMP of the first gain parameter ODGAIN is set to "0", the first gain parameter ODGAIN is decreased by a predetermined amount β, and the multiplier of FIG. Volume parameter VOL supplied to 10
Is increased by a predetermined amount β (step S15). As a result, the first gain parameter ODGAIN is set to a small value so that overflow does not occur regardless of other parameter settings, and the volume parameter VOL is increased to compensate for the decrease.

In the following step S16, the overflow check mode is confirmed, and then it is determined whether or not the overflow check mode is still turned on. This is because after execution of step S24 described later, the process returns to step S16 and the process is repeated. Here, when the overflow check mode is turned off, this process is immediately terminated and the process returns to the process of FIG. 4. If not turned off, the test key code TESTKC is set to "0" (step S18), It progresses to step S19 of FIG.

In step S19, the test key code T
With the pitch of ESTKC, the touch parameter TOUCH is set to the maximum value, and the tone is sounded for a predetermined time based on the changed tone color parameter stored in the edit buffer 6b. Next, the adder 15 checks whether an overflow has occurred, and the check result is stored in the RAM 6 (step S20). Then, the test key code TESTKC is incremented by "1" (step S21), and it is determined whether or not the TESTKC value exceeds "127" (step S22). TESTKC ≦ 12
If it is 7, the process returns to step S19 and TESTKC = 12.
When it becomes 8, the process proceeds to step S23, and it is determined whether or not the overflow is detected for all the test key codes TESTKC.

If the answer to step S23 is affirmative (YES), that is, if the overflow is not detected, the first
Gain parameter ODGAIN and correction amount GAINCO
MP is increased by a predetermined amount α and volume parameter VOL is decreased by a predetermined amount α, and the process returns to step S16.

In this way, the first gain parameter O
If DGAIN is gradually increased from a small value at which overflow does not occur and an overflow check is performed each time, overflow occurs at some point and the answer to step S23 becomes negative (NO). In that case, the process proceeds to step S25, where the first gain parameter ODGAIN,
Both the correction amount GAINCOMP and the volume parameter VOL are returned to the values immediately before the overflow occurs, and these are stored as parameter determination values. The parameter determination value obtained in this way is a value within the range in which overflow does not occur with respect to the changed parameter setting.
The output of P9 can be maximized and optimal gain settings can be achieved.

In the following step S26, the fact that an overflow has occurred and the overflow check mode has ended is displayed on the display unit 5, and the process of FIG. 4 returns.

As described above, according to the processing of FIGS. 5 and 6, the gain parameter ODGA input to the multiplier 12 of FIG.
The IN value is gradually increased from a small value, and every time the IN value is increased, the overflow check is performed over the entire pitch range to be sounded. When an overflow occurs at any of the pitches, the ODGAIN value and GAI immediately before that overflow occur.
The NCOMP value and the VOL value are stored as the determined values.
Therefore, the gain parameter O thus obtained
DGAIN is DS within the range where overflow does not occur.
The output of P7 becomes the maximum value, and a good S / N tone signal can be obtained while preventing the adverse effect of overflow.

In step S19 of the above-described processing, the actual pronunciation is made in consideration of the convenience of the performer, but of course the overflow check is possible without actually producing the sound, and it is not always necessary to produce the sound. There is no.

In the determination in step S23, for example, when the number of overflowed key codes is within a predetermined number (for example, 5), it is determined that there is no overflow, and the first gain parameter ODGAIN is further increased to generate the overflowed key code. May exceed the predetermined number, the process may proceed to step S25.

Further, as a result of the check in step S20, if an overflow occurs, the process may immediately proceed to step S25 to determine the gain parameter.

Further, the correction amount GAINCOMP of the first gain parameter ODGAIN may be displayed in step S26, and the GAINCOMP value may be stored in association with another parameter setting value to set the same or similar parameter. For the above, the stored value may be used to determine the first gain parameter ODGAIN and the volume parameter VOL. Here, the similar parameter setting means that the parameter setting value is within a predetermined range centered on the stored setting value.

Further, in the above-described embodiment, the control and tone synthesis are divided into the CPU and the DSP.
All processing may be performed by one processor.

[0037]

As described in detail above, according to the present invention, when a predetermined tone parameter value is sequentially changed to generate a tone signal and an overflow is detected in the arithmetic processing of the tone signal generating means. Since the parameter value immediately before the detection is stored as the determined value, it is possible to obtain the musical tone parameter having the maximum output in the range in which the overflow does not occur even if the parameter for determining the tone color is changed.

[Brief description of drawings]

FIG. 1 is a block diagram illustrating a configuration of an electronic musical instrument according to an embodiment of the present invention.

FIG. 2 is a diagram showing a usage state of the RAM of FIG.

FIG. 3 is a functional block diagram of the DSP and DSP-RAM shown in FIG.

4 is a flowchart of a main program executed by the CPU of FIG.

5 is a flowchart showing a procedure of a parameter editing process of FIG.

FIG. 6 is a flowchart showing a procedure of parameter editing processing of FIG.

[Explanation of symbols]

 1 Performance Operator 2 Setting Operator 3 CPU 4 ROM 6 RAM 7 DSP 8 DSP-RAM

Claims (2)

[Claims] 1. A parameter setting device of a musical tone synthesizer comprising a musical tone signal generating means for generating a musical tone signal by performing a predetermined calculation process on the basis of a plurality of musical tone parameters, and sequentially changing the value of a predetermined musical tone parameter. Control means for supplying to the tone signal generating means and instructing the generation of the tone signal, a detecting means for detecting occurrence of overflow in the arithmetic processing in the tone signal generating means, and a detecting means for detecting the overflow. A parameter setting device for a musical tone synthesizing device, comprising: storage means for storing, as a determined value, the value of the predetermined musical tone parameter supplied to the musical tone signal generating means immediately before the detection. 2. A parameter setting method of a musical tone synthesizer comprising a musical tone signal generating means for generating a musical tone signal by performing a predetermined arithmetic processing on the basis of a plurality of musical tone parameters, wherein the value of the predetermined musical tone parameter is sequentially changed. And instructing the generation of a tone signal while supplying the tone signal to the tone signal generating means, detecting that an overflow has occurred in the arithmetic processing in the tone signal generating means, and when the overflow is detected, immediately before the detection. A parameter setting method for a musical tone synthesizing apparatus, characterized in that the value of the predetermined musical tone parameter supplied to the musical tone signal generating means is stored as a determined value.