KR960007126B1 - Effect tone adding circuit and method of tone revival system - Google Patents

Abstract

The circuit comprises an effective sound adding unit for checking whether the effective sound is added to the original signal; an external waveform detecting unit; a control unit for interfacing with the effective sound adding unit and a filter constructing part; an internal waveform detecting unit; a multiplication unit for multiplying output signals from both of the internal waveform detecting unit and the external waveform detecting unit, and transferring data suitable for the right and left channels; a multiplexing unit for providing the output signal from the multiplication unit to a data output unit; and a register unit.

Description

Circuit and method of sound effect of sound regeneration system

1 is a block diagram of a general sound reproduction system.

2 is a schematic block diagram of an effect sound adding circuit of the sound reproducing system of the present invention.

3 is a block diagram of a waveform reproducing apparatus during the second.

4 is a detailed block diagram of the waveform reproducing apparatus of the present invention.

5 is a signal flow diagram of the present invention.

* Explanation of symbols for main parts of the drawings

11: Keyboard part 12: Function selector

13: address decoder 14, 100A: microcomputer

15: ROM 16: Waveform playback unit

17: external ROM 18: D / A converter

19: main amplifier 20: internal data storage

30: external program memory 40: effect sound

50: internal waveform detector 60: external waveform detector

70: register section 80: internal data RAM section

90: multiplication unit 100: interface unit

110: filter configuration 120: multiplexer

130: data output unit 20: internal data storage unit

30: external program memory 40: sound effect determination unit

50: internal waveform detector 60: external waveform detector

70: register section 80: internal data RAM section

90: multiplication unit 100: interface unit

110: filter configuration 120: multiplexer

130: data output unit

The present invention relates to a voice reproducing system capable of digital filtering, and more particularly, to a sound reproducing system and an effect sound adding circuit and a method for facilitating the imposition and chorus of an effect sound and reducing noise by blocking unwanted frequency bands.

1 is a block diagram of a general sound reproducing system, as shown therein, a keyboard unit 1 for outputting various sound selection signals, and an address decoder 2 for decoding the output signals of the keyboard unit 1. And a function selector 3A for accepting various functions selected by the user, an output adjuster 3B for outputting a level adjustment signal for a sound output signal, and a program stored in the RAM 5 to control the entire system. A microcomputer 4, a sound source integrated device 6C for generating analog sound commonly used in the output data of the microcomputer 4, and an external ROM for storing data for operation control of the sound source integrated device 6C. 7), an A / D converter 6B for converting and outputting the output analog signal A of the sound source integrated device 6C into a digital D signal, and an output digital signal of the digital effect circuit 6A. An A / D converter 8 for converting into an analog signal, and the A / D converter 8 The main signal amplifier 9 is configured to amplify an output signal of a) to an appropriate level and output the same to a speaker SP.

First, the microcomputer 4 receives the keyboard and function data from the address decoder 2, the function selector 3A, and the output adjuster 3B, and confirms which key is pressed to what degree of strength from this data. .

Thereafter, the microcomputer 4 outputs various control data to the sound source integrated device 6C on the basis of the input data, so that the sound source integrated device 6C is supplied from the microcomputer 4. The analog sound corresponding to the data is output, which is converted into the corresponding digital signal through the A / D converter 6B and then supplied to the digital effect circuit 6A.

Accordingly, the digital effect circuit 6A determines the amount and type of the effect sound under the control of the microcomputer 4, and then adds it to the original signal supplied from the A / D converter 6B and outputs it. This is converted into an analog signal through the A / D converter B and the main amplifier 9, amplified to an appropriate level, and then output to the speaker SP to generate a corresponding sound selected by the player.

However, in such a conventional system, a digital effect circuit A / D2 transducer and a sound source integrated element are additionally added to the outside to generate digital effect sound, and thus, the cost of the product is increased, and the A / D converter and As the A / D converter is used together, the S / N ratio is lowered, and there is a problem in that the function cannot be solved when adding different effect sounds to the synthesized sound and the sampling sound.

The present invention has been made to reduce the cost of the product, to improve the S / N ratio, and to give an effect sound for each of the synthesized sampling and sampling sound in order to solve such a conventional problem described in detail by the accompanying drawings do.

2 is a schematic block diagram of an effect sound adding circuit of the sound reproducing system of the present invention, as shown therein, an address decoder 13 receiving and decoding a selection signal from the keyboard unit 11 and the function selecting unit 12; ), A microcomputer 14 for controlling the entire system, a RAM 15 in which a predetermined program for controlling the microcom 14 is stored, and an output signal of the microcomputer 14 are read and waveform reproduction is performed. A waveform reproducing unit 16 for outputting a digital signal for a digital signal, an external ROM 17 storing a predetermined program for controlling the waveform reproducing unit 16, and an output to the waveform reproducing unit 16; A / D converter 18 for converting a digital signal to an analog signal, and a main amplifier 19 for amplifying the output signal of the A / D converter 18 to an appropriate level for driving by a speaker SP11. It was.

3 is a block diagram of the waveform reproducing unit 16, and FIG. 4 is a block diagram of the effect sound adding circuit of the sound reproducing system of the present invention. As shown therein, it is determined whether to add an effect sound to the original signal. It is composed of an effect sound addition determining unit 40, a microcomputer 100A, RAM 100B and the microcomputer interface unit 100, the external waveform detection unit 60, the sound effect addition determination unit 40 and the filter configuration unit 80 And a control unit 100 for interfacing with the control unit 100, an X register 90A, a Y register 90B, and a multiplier 90C to multiply the output signals of the internal waveform detector 50 and the external waveform detector 60. A multiplier 90 for transmitting data suitable for left and right channels, and a multiplex 120 and a register 70 for supplying the output signal of the multiplier 90 to the data output unit 130. 5, to which the operation and effect of the present invention configured as described above are attached Detailed description with reference to the following.

First, data selected from the keyboard section 11 and the function selection section 12 are decoded through the address decoder 13 and supplied to the microcomputer 14, and the data stored in the RAM 15 of the microcomputer 14. After decoding, the control signal is output to the waveform reproducing unit 16.

Accordingly, the waveform reproducing unit 16 accumulates the resultant values recorded in the A register 70A and the B register 70B by the accumulator 70C by the instruction signal of the microphone, and then outputs them to the bus to calculate the memory address. The output signal of the accumulator 70 is supplied to a WF (Wave Form) register 70D for controlling the address and a PHI (Phase Index) register 70E for controlling a lower address, and the internal and external waveforms are supplied thereto. The interface for playback is stored.

On the other hand, the X register 90A holding the sampling data and the output of the Y register 90B generating coefficients to be supplied to the sample data via the bus are supplied to a 12x12 multiplication key 90C where X After the Y input decoder is multiplied, this value is passed to a value suitable for the left and right channel sides, and after the bit reduction is performed to prevent data overfluiding through the attenuators 130A and 130B, this data is transmitted. Are again output to the adders 130C and 130D, and the outputs of the adders 130C and 130D are finally delivered through the 32-bit shift register 130E and the A / D converter 18. Is supplied.

The output of the multiplier 90C constitutes a finite impulse (FIR) filter according to the delays 110A, 100B, and 110C, and a multiplication factor, where the number of delay circuits indicates a filter order. The coefficient of is the value (①.②, ③) given from the microcomputer 100A.

The internal waveform data storage unit 20 stores data for reproducing internal waveforms, that is, sine and sawtooth waves, and the internal table access logic unit 50A receives the clock and address information through the multiplexer 40A to receive the internal waveform. After interpreting the data, it is output to the internal waveform regenerator 50B, and the internal waveform regenerator 50B calculates and outputs the internal waveform data, which is multiplied by the amplitude value in the multiplier 90C.

In addition, the external waveform detection unit 60, which is an external memory interface logic unit, receives data from the external program memory 30 and supplies it to the X register 90A in the multiplier 80, and externally in the external program memory 30. The sampled data is stored, and the parameter RAM 80A stores data such as sampling rate information, phase information, address information, and gain for the output signal, which determine whether or not the reading ratio should be read.

On the other hand, Figure 5 shows the signal flow of the present invention will be described as follows.

In the initialization state of the microcomputer 14, the output data of the keyboard unit 11 and the function selection unit 12 are supplied through the address decoder 13 to decode the key to determine the pressed state and the tone of the key, and to reproduce the waveform. After the parameter value algorithm is transmitted to the unit 16, the access state of the internal data is determined.

If the internal data is in the access state, the data is read out from the internal data, and if the external data is in the access state, the parameters and algorithms are extracted by processing the data through the accumulator 70C and the multiplier 90, If it is necessary to check whether the effect sound needs to be added, the FIR filter is passed through, and the filter coefficients and the filter dimensions are determined by the microcomputer 100A.

The final output is then shifted through the adders 130C, 130D and 32-bit shift register 130E, and then supplied to the D / A converter 18, and the signal output therefrom is the main amplifier. The speaker SP11 is driven through 19.

As described in detail above, the present invention has a digital sound effect function externally and enables the function to be provided inside a sound source integrated device without using an expensive dedicated integrated device, thereby reducing the cost of the product and synthesizing sound and sampling. The sound effects can be added separately to the sound, and the filter coefficients and orders can be easily varied, so that the sound effects can be reproduced in various ways.

Claims (2)

Control unit 100 for interfacing with the sound effect addition determination unit 40, the external waveform detection unit 60, the effect sound addition determination unit 40 and the filter configuration unit 80 to determine whether to add the effect sound to the original signal. ), A multiplier 90 for multiplying the output signals of the internal waveform detector 50 and the external waveform detector 60 to transmit data suitable for the left and right channels, and the output signal of the multiplier 90. An effect sound adding circuit of a sound reproducing system, comprising a multiplexer (120) and a register (70) supplied to a data output unit (130). After the output data of the keyboard section 11 and the function selection section 12 are decoded to determine the pressed state and the tone of the key, the parameters and algorithms are transmitted to the waveform reproducing section 16 to determine the access status of the internal data. When the internal data is in the access state, the data is decoded from the internal data when the external data is in the access state, and the parameters and algorithms are extracted. The data is processed through the accumulator 70C and the multiplier 90. When the effect sound needs to be added, the FIR filter is passed, and the final output is shifted through the adders 130C and 130D and the 32-bit shift register 130E, and then the D / A A method for adding an effect sound to a sound reproducing system, characterized by supplying a converter (18) and driving a signal (SP11) through the main amplifier (19).