JPH08328560A - Program generating device for signal processor and sound effect addition system using relevant device - Google Patents

Abstract

PURPOSE: To provide a program for DSP for easily realizing a required characteristic by beforehand defining components required for sound effect addition processing as a command word, describing a source program with the command word, inputting it to a program generating device and assembling. CONSTITUTION: A computer 2 forms a DSP(digital signal processor) program to transfer it. An effecter 1 is a signal processor using the DSP, and inputs an analog signal from a microphone 3 or an electronic instrument 4, and adds a required sound effect to output it to an amplifier 5. In the program generating device, the components required for the sound effect addition processing such as e.g. a filter and a mixer, etc., are defined beforehand as the command words respectively, and the source program is described using the command words to be inputted to the program generating device and to be assembled. Thus, a user obtains easily the program for the DSP for realizing the required characteristic.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a program generating device and a sound effect providing system using the device, and more particularly to D
The present invention relates to a sound effect providing system that uses an SP (digital signal processor) and that allows a user to easily program a DSP.

[0002]

2. Description of the Related Art Conventionally, as a signal processing device using a DSP, a reverberation effect, a delay effect, and a modulation effect are applied to an analog or digital musical tone signal or voice signal input from the outside, for example, by processing based on a DSP program. There has been proposed an acoustic effect imparting device that imparts an acoustic effect such as. The apparatus was able to change the effect imparting characteristics by externally changing the processing parameters.

[0003]

In the conventional signal processing apparatus as described above, the effect imparting characteristic can be changed to some extent by changing the parameter, but the program itself is created by the manufacturer in advance. However, there is a problem in that the user cannot create or change the DSP program in order to obtain a desired effect imparting characteristic. Further, even if it can be done, it is very difficult to describe a source program that realizes desired characteristics by a mnemonic code in machine language when creating a DSP program. It is an object of the present invention to provide a sound effect imparting system by which the above problems of the prior art can be improved and a user can easily create a sound effect function or characteristic.

[0004]

SUMMARY OF THE INVENTION The present invention is a program generation having a source program input means for a DSP used in a signal processing device and an assemble means for generating a machine language based on the input source program. In the apparatus, extraction means for extracting a specific command word from the source program, means for converting the extracted command word into a command word or command word string corresponding to a predetermined signal processing function, and assembled machine language data And sending means for sending. Further, in the sound effect imparting system including the program generating device and the signal processing device connected to the device, the sending means of the program generating device includes the MIDI converting means for converting the machine language data into the MIDI message, and the signal processing device. Is M
IDI message receiving means, machine language detecting means for detecting that the received MIDI message contains machine language information, machine language converting means for converting a MIDI message containing machine language information into machine language data, and DSP And a transfer unit for transferring a machine language to the storage unit.

[0005]

According to the present invention, in a program generation device having a source program input means and an assemble means, a specific command word is extracted and converted into a command word or a command word string corresponding to a predetermined signal processing function, Sends the assembled machine language data. Therefore, for example, the constituent elements necessary for the sound effect imparting processing, such as a filter and a mixer, are defined as command words, the source program is described using these command words, and the program is input to the program generation device and assembled. As a result, the user can easily obtain the DSP program for realizing the desired characteristics. Further, in the sound effect imparting system including the program generating device and the signal processing device connected to the device, the transmitting means of the program generating device converts the machine language data into the MIDI message and transmits it, and the signal processing device, By converting the received MIDI message into machine language data and transferring the machine language to the storage means for storing the DSP program, the user can arbitrarily rewrite the DSP program in a short time. Therefore, it is possible to add a completely different sound effect by changing the DSPN processing program during the performance.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 2 is a block diagram showing an example of the configuration of a sound effect imparting system to which the present invention is applied. The effector 1 is a signal processing device using a DSP as described later, and inputs an analog signal from the microphone 3 or the electronic musical instrument 4, imparts a desired acoustic effect, and outputs it to the amplifier 5. The amplifier 5 amplifies the signal and is output from the speaker 6. The computer 2 as a control device is for controlling the effector 1. For example, an ordinary personal computer to which a well-known MIDI interface circuit is added can be used. The processing will be described later.

FIG. 1 is a block diagram showing the configuration of the effector 1. The CPU 10 is a central processing unit that controls the entire effector based on a control program stored in the ROM 11. The RAM 12 is used as a work area and a buffer, and may be backed up by a battery. The MIDI interface circuit 13
Sends and receives messages with external MIDI equipment. The panel circuit 14 includes various switches and liquid crystal or LE.
It is composed of a display device for displaying characters and figures by D or the like.

The A / D converter 15 converts an analog tone signal input from the microphone 3 or the electronic musical instrument 4 into a digital signal. The DSP 16 has the configuration described below.
The digital tone signal is processed, and filtering or effects such as reverberation, delay, and modulation are performed. DSP-RA
M17 stores a DSP program or tone signal data being processed. The D / A converter 18 converts the digital musical tone signal processed by the DSP into an analog signal. The A / D converter 15 and the D / A converter 18 are controlled by a timing control circuit (not shown) to control the CPU 1
A / D, D / at a predetermined sampling cycle without going through 0
Performs A conversion and data transfer with the DSP. Bus 1
Reference numeral 9 connects each circuit in the effector 1.

FIG. 3 is a block diagram showing an example of the configuration of a DSP usable in the present invention. The configuration of the DSP 16 can be divided into three parts: a data storage and input / output unit, a calculation unit, and a control unit. The data RAM 30, which is a data storage unit, is connected to the data bus 37,
A memory having a storage capacity of word × 24 bits,
Ring buffer control is performed in which the data stored in each sampling cycle moves to the previous address. The coefficient RAM 39 is connected to the coefficient bus 38 by 1
It is a memory having a storage capacity of 28 words × 16 bits. The coefficient RAM stores parameters for effect imparting processing, envelope parameters for level control, and the like.

The delay RAM 34 is a built-in or externally attached RAM having a relatively large capacity, and has a structure of, for example, 64 kilowords × 24 bits. It is functionally the same as the data RAM 30, and the data moves to the previous address in each sampling cycle in the ring buffer format. If the sampling cycle is set to about 44 kHz, the delay RAM 34 can delay the signal for about 1.5 seconds at the maximum. The address buffer 31 comprises a plurality of registers, and the delay RAM writing circuit 3
2. The delay RAM read circuit 33 uses address buffers to control writing and reading of the delay RAM 34. The input circuit 35 and the output circuit 36 respectively input data from the bus 19 to the data bus 37 in the DSP and output data in the reverse direction.

The multiplier 40, which is an arithmetic unit, is provided in the data bus 3
The data on 7 is multiplied by the coefficient on the coefficient bus 38. The bit shift circuit 41 shifts the output data of the multiplier rightward and leftward by a predetermined number of bits (multiplies by a power of 2). Adder 4
2 adds the output of the bit shift circuit 41 and the output of the accumulator 44 and outputs the output to the accumulator 44.
Alternatively, it is output to the register 43. DSP that is the control unit
The internal CPU 45 is an instruction ROM 46 or an instruction RAM 47.
Take out the DSP programs one by one, decode them,
Each block in the DSP is controlled via the control bus 48. The instruction ROM 46 and the instruction RAM 47 may be internal or external (corresponding to the DSP-RAM 17), and the instruction RAM 47 has a path (not shown) for writing the DSP program from the external bus 19.

Next, in the present invention, a function which is a specific instruction word defined in advance will be described. FIG. 4 is a functional block diagram of the function “IIR1” and an explanatory diagram showing a program. FIG. 4A is a functional block diagram showing a first-order IIR filter which is a signal processing function of the function.
50 and 53 may be considered as tags indicating the storage locations of the memory or the memory itself, and the data RAM 30 of FIG.
Indicates that data is written in or read out from the storage address described above the tag. In FIG. 4A, first, data is read from the address D1 of the data RAM 30, and the multiplier 51 counts RA.
The count read from the C1 address of M39 is multiplied.
The delay circuit 54 is a circuit that delays (stores) a signal by one sampling period, and uses the data RAM 30.

The signal read out from the delay circuit one sampling cycle before is multiplied by the multiplier 55 with the count read out from the address C2 of the counting RAM 39. The outputs of the two multipliers 51 and 55 are added by the adder 52,
The data is written in the address D2 of the data RAM 30 and delivered to the next process. The data RAM 30 is controlled by the ring buffer as described above, and the content written in the address D2 moves to the address D1 in the next cycle. Therefore, the data is read from the delay circuit 54 in the data RAM 30.
It will be read from address D1. FIG. 4B shows a notation example of the function “IIR1”. The parameters in parentheses are the counting RAM 3 corresponding to the same symbols in FIG.
9 or the value of the address of the data RAM 30.

FIG. 4C is a program example in which the program corresponding to FIG. 4A is described by a mnemonic code corresponding to a machine language, and is stored in advance in correspondence with the function. "ADD" in the first row is the multiplier 40 (41)
Is a mnemonic code of an instruction for adding the multiplication output of the above and the output of the accumulator 44, and outputting the result to the accumulator. "[C (C1) x D (D1)]" is the address It indicates that the contents are multiplied by the contents of the address D1 of the data RAM and output. "ADR" in the second line is a mnemonic code of an instruction for adding the multiplication output of the multiplier and the output of the accumulator and outputting the result to the register 43, which is "[C (C2)
XD (D2-1)] "indicates that the multiplier multiplies the contents of address C2 of the coefficient RAM and the contents of address (D2-1) of the data RAM and outputs the result. “OUT” on the third line sets the value of register 43 to D2 of the data RAM.
It is an output instruction to be stored in the address.

When using this function, the counting RAM
Filter parameters corresponding to desired characteristics are set in advance at addresses C1 and C2 of 39. In addition, by changing this parameter or changing the values of C1 and C2 itself and referring to the coefficient of different address, II
The frequency characteristic of the R filter can be changed.

FIG. 5 is a functional block diagram of the function "IIR2" and an explanatory diagram showing a program. Figure 5 (a) shows
It is a functional block diagram which shows the 2nd-order IIR filter which is the signal processing function of this function, and the meaning of each symbol is the same as FIG.4 (a). FIG. 5B shows a notation example of the function “IIR2”. FIG. 5C is an example of a program in which the program corresponding to FIG. 5A is described by a mnemonic code corresponding to a machine language. Similar to IIR1 described above, C1 ~
The frequency characteristic of the IIR filter can be changed by changing the parameter which is the contents of the address C5.

FIG. 6 is a functional block diagram of the function "ALLP" and an explanatory diagram showing a program. FIG. 6A shows
It is a functional block diagram which shows the all-pass filter which is the signal processing function of this function, and the meaning of each symbol is the same as that of FIG. The delay circuit DL60 is a circuit that delays (holds) a signal for a relatively long time, and the delay RAM 34 is used. Then, the write address and the read address to the RAM are stored in the counting RAM at the addresses C1 and C2, respectively. Since the delay RAM is also controlled by the ring buffer, the signal is delayed by the difference between the contents of the addresses C1 and C2.

FIG. 6B shows a notation example of the function "ALLP". FIG. 6C is an example of a program in which the program corresponding to FIG. 6A is described by a mnemonic code corresponding to a machine language. "DLR" is the delay RAM3
4 is a mnemonic code representing a data read instruction from 4, and "C (C1) → R" indicates that the data is read from the address of the delay RAM read from the address C1 of the coefficient RAM 39 and stored in the register. Also,
Similarly, "DLW" represents a write command to the delay RAM.

FIG. 7 is a functional block diagram of the function "MIX3" and an explanatory diagram showing a program. FIG. 7A shows
It is a functional block diagram which shows the 3 input mixer which is the signal processing function of this function, and the meaning of each symbol is the same as FIG.4 (a). FIG. 7B shows a notation example of the function “MIX3”. FIG. 7C is an example of a program in which the program corresponding to FIG. 7A is described by a mnemonic code corresponding to a machine language. In this function, the level of each input signal to be mixed can be changed by changing the parameter which is the contents of the addresses C1 to C3.

When a user creates a program having desired characteristics, first, the functional blocks of the above-mentioned functions are combined to create a functional block diagram for achieving a desired function. FIG. 8 is a functional block diagram showing a signal processing function for giving a delay effect which is a sound effect that can be realized in the present invention. In this delay effect imparting process, three all-pass filter blocks J, K, L and a 3-input mixer circuit M are used. Then, the used addresses in the coefficient memory 39 and the data memory 30 are determined. In addition,
The coefficient value set in the coefficient memory 39 is also decided at this time. In determining the coefficient, for example, frequency characteristics corresponding to a plurality of different coefficient values are obtained in advance for each function, and a table is prepared. Then, the coefficient is determined with reference to the coefficient value close to the desired characteristic. Then, the effect is actually added, and if the desired characteristic is not obtained, the coefficient value is changed.

FIG. 9 is an explanatory diagram showing a program example in which the program corresponding to the functional block diagram of FIG. 8 is described by using the above-mentioned function. The "ALLP" instruction on the first line corresponds to the functional block J in FIG. 8, and the numbers in parentheses of the parameters are the actual address data. That is, the input data is written in the address 01 of the data RAM 30, and the data processed by this instruction is stored in the address 02. Then, the processing data of the three ALLP instructions are stored at addresses 02, 03, and 04, respectively, and 02, 03, and
The data at address 04 are mixed at a ratio corresponding to the parameter and stored at address 05. This data is read by a subsequent process (not shown) or output to the outside. Thus, using the function, for example, FIG.
Can be expressed in four lines. At this time, an instruction word corresponding to a normal machine language and a function may be mixed in the program.

FIG. 10 shows the DS in the computer 2.
7 is a flowchart showing a main processing procedure for creating and transferring a P program. In step S31, a DSP source program using a function is input and edited. To this end, as described above, the user first creates a functional block diagram that achieves a desired signal processing function as shown in FIG. 8, and as shown in FIG. Describe the source program to be realized. Then, the program is input to the computer 2.

The variable L is reset to 0 in step S32, and 1 is added to L in step S33. In step S34, the Lth line of the input source program is read, and in step S35, it is determined whether or not the read mnemonic code is a specific command word corresponding to any of a plurality of registered functions. To be judged. If the result is affirmative, the process proceeds to step S36. In step S36, an instruction word string corresponding to the specific instruction word described by the mnemonic code corresponding to the machine language (for example, FIG. 4C).
Read out.

In step S37, the parameter set in the specific command word is transferred to the corresponding position in the command word string. In step S38, the line in which the specific command word is written is deleted from the source program,
The read command string is inserted at the same position. Then, the increased number of rows is added to L. In step S39, it is determined whether or not the end of the source program has been reached. If the result is negative, the process returns to step S33 to process the next line, but if affirmative, the process proceeds to step S40. Through the above processing, the function expression in the source program is converted into the expression by the mnemonic code corresponding to the machine language.

In step S40, the source program is assembled and converted into a machine language. As the assembler program for DSP, for example, one supplied from a DSP maker can be used. In step S41, it is determined by the assembler program whether or not the assemble processing is completed normally. If the assembly process is abnormal, the process starts over from step S31.
Move to 42. In step S42, the generated machine language is converted into a MIDI message file. The machine language may include all bit patterns, whereas a specific bit pattern cannot be directly transmitted when data is transmitted using the system exclusive message in the MIDI message. Therefore, the machine language data is converted so as not to include a bit pattern that cannot be transmitted by the MIDI message.

Since bit 7 (MSB) of the data byte of the MIDI message must be 0, the machine language is first divided into 4 bits (1 digit in hexadecimal) and 0 for 4 bits is added to the upper part. . When this data string is viewed in byte units, all the upper 4 bits are 0. This is inserted into the data part of a known MIDI exclusive message to generate a MIDI message file. In order to simplify the transmission control, the program has a maximum length (eg 1
If it is shorter than 92 words x 32 bits), extra "0" is added to make the length uniform, and the data portion of the MIDI message has a fixed length. In step S43,
The generated MIDI file is transmitted to the effector 1.
By the same method, fixed-length coefficient data set in the coefficient RAM is also transferred.

FIG. 11 is a flowchart showing the main processing of the CPU of the effector 1. In step S10, it is determined whether or not there is a change in the state of the panel of the effector. If a change in the state of a switch or the like is detected, the process proceeds to step S11 and the corresponding panel processing is performed.
For example, when the acoustic effect parameter is changed, the coefficient data corresponding to the new parameter is changed to the coefficient RA of the DSP.
Transfer to M and update coefficient. In step S12, it is determined whether or not a MIDI message is received from the outside. If the result is affirmative, the process proceeds to step S13, and the received message is an exclusive message for information (program or coefficient) transfer. It is determined whether or not, and if the result is affirmative, step S14
Move to If the received message is any other message, the process corresponding to each message is performed.

In step S14, it is determined whether the received message is a program (that is, coefficient data),
If the result is positive, the process proceeds to step S15, but if the result is negative, the process proceeds to step S16. Step S1
In 5, the predetermined number of bytes for the program in the received data is stored in the receive buffer. Also, step S1
In 6, the predetermined number of bytes corresponding to the coefficient data of the received data is stored in the receiving buffer. In step S17, the inverse conversion on the transmitting side is performed to restore the machine language program data or coefficient data. In step S18, the machine language or coefficient data is transferred to the DSP via the bus.

FIG. 12 is a flowchart showing the processing of the CPU 45 in the DSP. In step S20, the in-DSP CPU 45 executes the program stored in the instruction RAM only once based on the activation signal input from the outside every sampling cycle. This processing is executed in a time shorter than the sampling cycle. Step S2
In No. 1, it is determined whether or not there is a program or coefficient data transfer request from the effector CPU, and if the result is affirmative, the process proceeds to step S22. In step S22, it is determined whether or not the data to be transferred is a program, and if the result is affirmative, the process moves to step S23 to receive a predetermined number of bytes of program data from the outside (bus), and execute an instruction. It is stored in the RAM 47.
In step S24, a predetermined number of bytes of coefficient data are received from the outside and stored in the coefficient RAM 39. With the above-described configuration and processing, a program arbitrarily generated by the user is converted into a machine language to convert the DSP in the effector.
, And signal processing can be performed.

Although the embodiment has been described above, the following modifications are also possible. The function needs to be registered in the system in advance, but the user may register an arbitrary function created by the user in the system by inputting an instruction word string corresponding to the function description. Although the address data of the coefficient memory and the data memory, which are the parameters of the function, has been disclosed as an example of directly specifying the absolute address, for example, it is described using a label or a relative address for the label,
The system may automatically assign a vacant address.

[0031]

As described above, according to the present invention, the components necessary for the acoustic effect imparting process, such as a filter and a mixer, are defined as command words, and the source program is created using these command words. By describing the above, inputting it into the program generation device, and assembling, the user can easily obtain the DSP program for realizing the desired characteristics. Further, in the sound effect imparting system including the program generating device and the signal processing device connected to the device, the user can arbitrarily rewrite the DSP program in a short time. It is also possible to modify the processing program to add completely different sound effects. In terms of hardware, the signal processing device is, for example, a DSP effector having a MIDI function, and the system can be configured by including the effector and a personal computer, so that it can be implemented at low cost without requiring special hardware.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an effector 1 of the present invention.

FIG. 2 is a block diagram showing a configuration of a sound effect imparting system to which the present invention is applied.

FIG. 3 is a block diagram showing an example of the configuration of a DSP.

FIG. 4 is a functional block diagram of a function IIR1 and an explanatory diagram showing a program.

FIG. 5 is a functional block diagram of a function IIR2 and an explanatory diagram showing a program.

FIG. 6 is a functional block diagram of a function ALLP and an explanatory diagram showing a program.

FIG. 7 is an explanatory diagram showing a functional block diagram and a program of a function MIX3.

FIG. 8 is a functional block diagram showing a signal processing function for giving a delay effect.

9 is an explanatory diagram showing a program example in which a program corresponding to the functional block diagram of FIG. 8 is described by using a function.

FIG. 10 is a flowchart showing main processing of the computer 2.

FIG. 11 is a flowchart showing a main process of the effector CPU.

FIG. 12 is a flowchart showing processing of the CPU 45 in the DSP.

[Explanation of symbols]

1 ... effector, 2 ... computer, 3 ... microphone, 4 ...
Electronic musical instrument, 5 ... Amp, 6 ... Speaker, 10 ... CPU,
11 ... ROM, 12 ... RAM, 13 ... MIDI interface, 14 ... Panel, 15 ... A / D converter, 16 ...
DSP, 17 ... DSPRAM, 18 ... D / A converter, 1
9 ... Bus

Claims (3)

[Claims] 1. A program generation device having a source program input means for a digital signal processor used in a signal processing device, and an assemble means for generating a machine language for the digital signal processor based on the source program. Extraction means for extracting a specific command word from the program, conversion means for converting the extracted command word into a command word or command word string corresponding to a predetermined signal processing function, and an output source program of the conversion means is assembled. And a sending means for sending the machine language data described above. 2. The specific plurality of command words respectively correspond to a plurality of signal processing functions required for sound effect addition processing, and as a parameter, at least one of an input signal and an output signal of the processing is used. The program generation device according to claim 1, further comprising storage address instruction information. 3. A sound effect imparting system including a signal processing device using a digital signal processor and the program generating device according to claim 1 connected to the device, wherein the sending means in the program generating device comprises: MIDI signal converting means for converting machine language data into a MIDI message, wherein the signal processing device detects MIDI message receiving means, and detects that the MIDI message received from the control device includes machine language information. Means, machine language conversion means for converting a MIDI message containing machine language information into machine language data, storage means for storing a program of a digital signal processor, transfer means for transferring the machine language to the storage means A sound effect imparting system comprising: