KR950007857B1 - Reverse sound generating device of electron musical instruments - Google Patents

Abstract

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Description

Reverse sound generator of electronic musical instrument

1 is a block diagram of a conventional electronic instrument.

2 is a waveform diagram of the PCM sound data of an electronic musical instrument, (b) a waveform diagram of the static data of an electronic musical instrument, and (c) a waveform diagram of the reverse sound data of an electronic musical instrument.

3 is a block diagram of the electronic musical instrument of the present invention.

4 is a circuit diagram of the reverse sound generation unit of the electronic musical instrument of the present invention.

5 is a code table of the enable block provided in the reverse sound generating unit of the present invention.

* Explanation of symbols for main parts of the drawings

11: sound processor 12: PCM sound data storage unit

13: D / A conversion unit 14: low pass filter

15: reverse sound generation unit 16: reverse address calculation unit

17: enable brom 18: address clear part

The present invention relates to a reverse tone generator of an electronic musical instrument suitable for generating various sounds by converting sequentially increasing addresses when reading PCM sound data through the sound processor of the electronic musical instrument to reverse addresses and sequentially decreasing them.

As shown in FIG. 1, a conventional electronic musical instrument is a digital form in which a sound processor 1 for processing sound by reading sound data by a control coder and a musical instrument sound to be sounded are sampled by a pulse code modulation (PCM) method. PCM sound data storage unit (2) and stored. D / A converter 3 for converting the digital sound data output from the sound processor 1 into analog sound data, and a low pass filter 4 for filtering the converted analog sound data to output sound. .

As shown in FIG. 1, the conventional electronic musical instrument configured as shown in FIG. 1 transmits the address of the musical instrument 1 to the PCM sound data storage unit 2, by means of a gear signal, to the PCM sound data storage unit 2. The sound data output from the storage unit 2 is sequentially read to process various sounds.

The processed various sounds are converted to analog sound data by the D / A converter 3, filtered through the low pass filter 4, and the sound is output.

At this time, the sound processor 1 reads the sound data in the forward direction while sequentially increasing the address in which the instrument sound to be outputted is stored, and the PCM sound data storage unit 2 as shown in FIG. Generates only static waveforms, such as PCM sound data waveforms.

However, since the conventional electronic instruments only generate the sound by reading the PCM sound data in the forward direction, there is a problem in that a large amount of storage is required because the sound must be sampled and stored in the PCMD sound data storage unit 2 to produce various effects such as wind noise.

The present invention is provided with a reverse sound generator between the sound processing unit and the PCM sound data storage unit to solve such a problem, when the sound processing unit reads the PCM sound data of the PCM sound data storage unit, the sound is output from the sound processing unit It is possible to generate various effect sounds using limited sound data by changing the sequentially increasing stored addresses to sequentially decreasing reverse addresses, and to reduce the amount of storage of the PCM sound data storage through this. Referring to the configuration and effect of the present invention by the accompanying drawings as follows. First. As shown in FIG. 3, the electronic instrument of the present invention includes a sound processor 11 for processing sound by reading sound data according to a control signal, and an address in which an instrument sound for outputting sound from the sound processor 11 is stored. A reverse sound generator 15 for converting and outputting the signal to a reverse address, a PCM sound data storage unit 12, which is sampled and stored in a digital form in a pulse code manner, and outputs the sound from the sound processor 11; A D / A change section 13 for converting and outputting digital sound data into analog sound data, and a low pass filter 14 for outputting sound by filtering the changed analog sound data.

On the other hand, the reverse tone generator for changing the address stored in the instrument sound to be a reverse address as shown in Figure 4 the reverse address for calculating the address stored the instrument sound to be sounded by the reverse control signal input as the reverse address The calculation unit 16 calculates the reverse address by using the enable signal (17) for generating a signal for enabling the reverse address calculated according to the table length, and the enable signal output from the enable (17). It consists of an address clearing section 18 for clearing an address for clearing the address calculated in section 16. Unexplained numerals 16-1 to 16-16 are EXOR gates and 18-1 to 18-11 are AND gates. .

As shown in FIG. 3, the sound processor 11 reading the sound data by the control signal outputs an address in which the instrument sound to be sounded is stored.

The output forward address is converted into the reverse address by the reverse tone generator 15 and input to the PCM sound data storage unit 12.

That is, the static waveform output from the sound processor 11 as shown in (b) of FIG. 2 is output by the inverse sound generator 15 as an inverted waveform as shown in (c) of FIG.

At this time, if the control signal input to the reverse tone generator 15 is "1", the address (Addψ-Add15) output from the sound processor 11 is provided in the reverse address calculator 16 as shown in FIG. All bits are inverted by the EXOR gates 16-1 to 16-16 to be output to the reverse addresses RAddφ-RAdd15.

That is, when the input address (Addψ-Add15) is inputted as 0000000000000000b, the output is reversed to the 1111111111111111b by the EXOR gates 16-1 to 16-16. ) Is output to the last address.

Thereafter, when the next address is inputted as 0000000000000000b, it is outputted to 1111111111111110b by the EXOR gates 16-1 to 16-16 to become the address before the last address.

In this way, the address which is sequentially increased by the reverse address calculation unit 16 is converted into a reverse address which is sequentially decreased.

The converted output address is 32 bits when the table length output terminal TLEN of the enable block 17 into which the table length is input is 65 bits when the table length output terminal TLEN is 0000b, and 65K bits when 1011b outputs the output terminal (Enψ-En10). The enable signal outputted to the address clear unit 18 is input.

Therefore, when the table length is 32 bits, when the input address (Addψ-Add15) is input as 00000000000000000b, the enable block is outputted to 1111111111111111b by the EXOR gates 16-1 to 16-16 of the reverse address calculator 16 and then the enable block. (17) A reverse address (RAdd? -RAdd15) of 0000000000011111 is outputted through the address clearing unit 18 to which this enable signal is input.

That is, since the table length is 32 bits, when the table output terminal TLEN is 0000b, the enable block 17 outputs 000000000000b and is inputted to the AND gates 18-1 to 18-11 of the address clearing unit 18 to output the address. The output is again inverted to (RAdd5-RAdd15).

Therefore, when the input address (Addψ-Add15) is sequentially increased, the output address (RAddψ-RAdd15) is sequentially decreased from 0000000000011111b, and a reverse tone is generated.

On the other hand, if the reverse control signal input to the reverse tone generator 15 is " (psi) ", then the stationary data is outputted to the reverse address calculator 16 as a steady state, thereby generating static data that increases sequentially.

As described above, the reverse sound generation unit provided between the sound processing unit and the PCM sound data storage unit converts and outputs an inverse address for sequentially decreasing the sequentially increasing address in which the instrument sound output from the sound processing unit is stored. There is an effect that can generate sound effects of various electronic instruments using sound data.

Claims (2)

A sound processor 11 for processing sound by reading sound data according to a control signal, and a reverse sound generator 15 for converting and outputting an address in which an instrument sound for outputting sound from the sound processor 11 is converted into a reverse address; The D / A converts and outputs the digital sound data output from the PCM sound data storage unit 12 and the sound processor 11 stored in the digital form by sampling the instrument sound to be sounded in a pulse number method. The reverse sound generator of the electronic musical instrument comprising a conversion unit (13) and a low pass filter (14) for outputting the sound by filtering the converted analog sound data. 2. The reverse address generator according to claim 1, wherein the reverse tone generation unit enables a reverse address calculation unit (16) for calculating an address in which an instrument sound to be sounded by the input reverse control signal is stored as a reverse address, and a reverse address calculated according to a table length. And an address clearing unit 18 for clearing the address calculated by the reverse address calculator 16 by the enable signal outputted from the enable block 17. Reverse sound generator of electronic musical instrument.