JP3383474B2 - Sound effect giving device and sound effect giving system - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sound effect imparting apparatus and system, and more particularly to a sound effect imparting system which uses a DSP (digital signal processor) and which allows a user to program a DSP. .

[0002]

2. Description of the Related Art Conventionally, a sound effect imparting apparatus using a DSP has been proposed. For example, an analog or digital tone signal or voice signal input from the outside is processed by a DSP program to produce a reverberation effect, It was possible to add acoustic effects such as delay effect and modulation effect. Moreover, the effect imparting characteristics could be changed by changing the parameters related to the processing.

[0003]

In the conventional sound effect imparting apparatus as described above, the effect imparting characteristics can be changed to some extent by changing the parameters, but the program itself is created in advance by the manufacturer. In order to obtain the desired effect imparting characteristics, the DSP
There was a problem that the program of could not be created or changed. It is an object of the present invention to provide an acoustic effect imparting apparatus and system which can improve the above-mentioned problems of the prior art and allow a user to freely create an acoustic effect function or characteristic.

[0004]

The present invention relates to a sound effect imparting apparatus using a digital signal processor, in which M
IDI message receiving means, machine language detecting means for detecting that the received MIDI message contains the machine language information of the digital signal processor, and machine language conversion for converting the MIDI message containing the machine language information into machine language data Means, storage means for storing the program of the digital signal processor, and transfer means for transferring a machine language to the storage means. Further, in the sound effect imparting system including the effect imparting device and the control device for the device, the controller is a DSP source program input means for realizing a desired processing function, and the input program is a machine language. And a MIDI conversion unit for converting the converted machine language data into a MIDI message and transmitting the MIDI message.

[0005]

According to the present invention, in a sound effect imparting system including a sound effect imparting device using a DSP and a controller connected to the device, the controller inputs a DSP source program and converts it into a machine language. The MIDI effect message is transmitted after being converted into a MIDI message, and the sound effect imparting apparatus receives the MIDI message.
When it is detected that the message includes machine language information, the MIDI message is converted into a machine language and transferred to the storage means of the DSP, so that the user can freely program any sound effect function or characteristic. It becomes possible, and it becomes possible to realize the function which the conventional effect imparting device does not have.

[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 sound effect imparting device using a DSP as will be described later, which inputs an analog signal from the microphone 3 or the electronic musical instrument 4, imparts a desired sound 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.

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,
The ring buffer is controlled so that the data stored in each sampling cycle moves to the previous address. The coefficient RAM 39 is connected to the coefficient bus 38.
It is a memory having a storage capacity of 8 words × 16 bits, and is also configured so that the data stored in each sampling cycle moves to the previous address.

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 right and left 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.
And output to the register 43.

The CPU 45 in the DSP, which is a control unit, issues an instruction R
The DSP programs are fetched one by one from the OM 46 or the instruction RAM 47, decoded, and each block in the DSP is controlled via the control bus 48. The instruction ROM 46 and the instruction RAM 47 are external (DSP-R
(Corresponding to AM17), and the instruction RAM 47 has a path (not shown) for writing the DSP program from the external bus 19.

FIG. 4 shows a DSP in the computer 2.
6 is a flowchart showing a main processing procedure for creating and transferring a program. In step S1, DSP
Input and edit the source program for. For this purpose, the user first creates a functional block diagram for achieving a desired signal processing function as shown in FIG. The functional block diagram of FIG. 7 shows an example of the all-pass filter. In creating the functional block diagram, blocks such as an adder, a multiplier, and a delay circuit corresponding to the functions of the DSP such as addition of signals, multiplication of a signal and a coefficient, and delay of a signal are used. Note that C (n) in FIG. 7 is a coefficient RAM (n
Is the address) and D (n) is the content of the data RAM. A delay RAM 34 is used as the delay circuit 54.

Next, the user determines a source code string (source program) representing a DSP instruction for sequentially executing each function of the functional block diagram and inputs it to the computer 2. FIG. 8 is an explanatory diagram showing an example of source code corresponding to the filter shown in FIG. In FIG. 8, "DLR"
Is a memonic code indicating a data read command from the delay RAM, and the next “C (04) → D (03)” is data from the delay RAM address stored in advance at address 04 of the coefficient RAM 39. Read, data RAM 30
It is shown that the data is stored in the address 03. Further, "ADD" in the next line is a memonic code of an instruction for adding the multiplication output of the multiplier and the output of the accumulator and outputting the result to the accumulator, which is "[C (03) x D (0
1)] ”indicates that the content of address 03 of the coefficient RAM is multiplied by the content of address 01 of the data RAM in the multiplier. Similarly, “ADR” is a multiplication / addition instruction for outputting the result to the register 43, “OUT” is an output instruction, and the like.
“DLW” represents a delay RAM write command. When the program shown in FIG. 8 is executed, it is necessary that predetermined coefficient data is set in the coefficient RAM in advance.

Returning to FIG. 4, in step S2,
Assemble the input source program and convert it to machine language. The assembler program for DSP is, for example, DS
It is possible to use the one supplied from the P maker. In this embodiment, as shown in FIG. 8, one instruction is converted into a 32-bit machine language. The maximum length of the machine language program is 192 words. In step S3, 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 S1. If the assembly process is normal, step S4 is executed.
Move to.

In step S4, the generated machine language is converted into a MIDI message file. Machine language may include all bit patterns, while M
When transmitting data using the system exclusive message in the IDI message, it is not possible to directly transmit a specific bit pattern. Therefore, the machine language data is converted so as not to include a bit pattern that cannot be transmitted by the MIDI message.

FIG. 9 is an explanatory diagram showing a process of converting a machine language into a MIDI message. FIG. 9A is a hexadecimal representation of the machine language of FIG. Since bit 7 (MSB) of the data byte of the MIDI message must be 0, first, the machine language is 4 bits (1 in hexadecimal).
Each digit) is divided, and 0 for 4 bits is added to the upper part to generate the data string of FIG. 9B. 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 as shown in FIG. 9 (c).

The maximum length of the data in FIG. 9B is 4 bytes x
Since 2 × 192 steps = 1536 bytes, the data portion of the MIDI message has a fixed length of 1536 bytes in order to simplify transmission control. If the program is shorter than 192 steps, extra "0" is added to make the lengths uniform. In the data ID part, a code indicating that this data is a DSP program (for example, 0
0) is inserted. Returning to FIG. 4, in step S5, 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. In this case, a code (eg 01) indicating that this data is coefficient data is inserted in the data ID portion.

FIG. 5 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 parameter of the acoustic effect is changed, the coefficient data corresponding to the new parameter is stored in the coefficient RAM of the DSP.
And update the coefficient. In step S12, it is determined whether or not a MIDI message is received from the outside, and if the result is affirmative, the process proceeds to step S13, and the received message is used for information transfer as shown in FIG. 9C. It is determined whether the message is an exclusive message. If the result is affirmative, the process proceeds to step S14. 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 (1536 bytes) for the program in the reception data is stored in the reception buffer.
Further, in step S16, a predetermined number of bytes (512 bytes) corresponding to the coefficient data of the received data is stored in the receiving buffer. In step S17, the inverse conversion of the conversion method shown in FIG. 9 is performed to restore the program data or the coefficient data in machine language. In step S18, the machine language or coefficient data is transferred to the DSP via the bus.

FIG. 6 is a flow chart 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 S21
At, it is determined whether or not there is a program or coefficient data transfer request from the CPU of the effector. If the result is affirmative, the process proceeds to step S22. In step S22, it is determined whether the data to be transferred is a program, and if the result is affirmative, step S22.
23, the program data of a predetermined number of bytes is received from the outside (bus) and stored in the instruction 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 configuration and processing as described above, it becomes possible to convert a program arbitrarily generated by the user into a machine language, transfer it to the DSP in the effector, and execute signal processing.

Although the embodiment has been described above, the following modifications are also possible. MI between the control device and the signal processing device
Although connected by the DI interface, any other transmission method such as RS232C can be used. As a machine language code conversion method when MIDI is used, a method of transmitting using only lower 4 bits is disclosed, but for example, all data is divided into 7 bits and 0 is added to the upper side. You may transmit what was made into 8-bit data. Further, an error detection or error correction code such as a parity bit or a CRC check code may be added to the data. In the embodiment, the program and the coefficient data are transferred independently, but when the program is transferred, the corresponding coefficient data is always required. Therefore, when the program is transferred by the computer, it is always supported. The coefficient data may be continuously transferred.

[0023]

As described above, if the acoustic effect imparting system is constructed using the acoustic effect imparting apparatus of the present invention,
The user can freely program an arbitrary sound effect function or characteristic, and it is possible to realize a signal processing function which the conventional effect imparting device does not have. In terms of hardware, the sound effect imparting device is a DSP effector having a MIDI function, and since the system can be configured with the effector and a personal computer, it can be implemented at low cost without requiring special hardware. There is also an effect.

[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 flowchart showing a main processing procedure in the computer 2.

FIG. 5 is a flowchart showing a main process of a CPU of an effector.

FIG. 6 is a flowchart showing the processing of the CPU 45 in the DSP.

FIG. 7 is a functional block diagram of a filter.

8 is an explanatory diagram showing an example of source code corresponding to the filter of FIG. 7. FIG.

FIG. 9 is an explanatory diagram showing a process of converting a machine language into a MIDI message.

[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

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) G10H 1/00-7/12

Claims (3)

(57) [Claims] 1. A sound effect imparting apparatus using a digital signal processor, a MIDI message receiving means, a machine language detecting means for detecting that the received MIDI message includes machine language information of the digital signal processor, and a machine. A machine language conversion means for converting a MIDI message containing word information into machine language data; a storage means for storing a program of a digital signal processor; and a transfer means for transferring a machine language to the storage means. Characteristic sound effect imparting device. 2. A sound effect imparting system including a sound effect imparting device using a digital signal processor and a controller connected to the device, wherein the controller is a digital signal processor for realizing a desired signal processing function. A source program input means for converting, a converting means for converting the input source program into a machine language, and a MIDI converting means for converting the converted machine language data into a MIDI message and transmitting the MIDI message. A MIDI message receiving means, a machine language detecting means for detecting that the MIDI message received from the control device contains machine language information, and a machine for converting a MIDI message containing machine language information into machine language data. It stores the word conversion means and the digital signal processor program. And a transfer unit for transferring a machine language to the storage unit. 3. The control device further includes parameter input means for a digital signal processor for realizing a desired signal processing characteristic, and MIDI conversion means for converting the converted parameter into a MIDI message and transmitting the MIDI message. The acoustic effect imparting device includes a parameter detecting unit that detects that the MIDI message received from the control unit includes parameter information, and a parameter converting unit that converts the MIDI message including the parameter information into parameter data. The sound effect imparting system according to claim 2, further comprising a second storage unit for storing parameters of the digital signal processor, and a parameter transfer unit for transferring the parameters to the second storage unit.