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Patent No. 4924744 Apparatus for generating sound through low frequency and noise modulation

 

Patent No. 4924744   Apparatus for generating sound through low frequency and noise modulation (Yamamura, May 15, 1990)

Abstract

In an apparatus for generating sound, there are provided a plurality of channels for generating sounds. Each of the channels includes a memory for storing waveform data, and at least one of the channels includes a noise generator so that various kinds of sounds including rhythm sound-effects sound, effects sound-vibrato etc. are generated. There is further provided a controller by which voice sound signal is passed through the channels so that artificial sound, voice sound etc. are generated. There is still further provided a circuit for adjusting an amplitude level of a whole sound which is obtained by mixing output sounds of the channels so that far and near sound is produced. Further, each of the channels includes left and right attenuators which divide a channel sound into left and right channel sounds. Still further, the apparatus comprises a low frequency oscillator for controlling a depth of frequency modulation, and a controller for writing sampling data of a predetermined waveform into serial addresses of a memory.

Notes:

FIELD OF THE INVENTION

The invention relates to an apparatus for generating sound, and more particularly to an apparatus for generating sound in which sound is generated in accordance with waveform data stored in registers.

BACKGROUND OF THE INVENTION

In one of conventional apparatuses for generating sound, musical sounds are synthesized by using higher harmonics which are produced in frequency-modulation. One of the frequency-modulation methods is a feedback frequency-modulation method in which a sinusoidal wave produced in a sinusoidal table is fed back with a predetermined feedback ratio, and the sinusoidal wave thus fed back is controlled to have a predetermined phase difference to provide a sinusoidal wave having a predetermined waveform. The synthesized wave thus obtained is further controlled to have a predetermined envelope by an envelope generator.

In the conventional apparatus for generating sound, however, there are resulted in following disadvantages.

Firstly, it is difficult to generate various kinds of sounds. Especially, it is not easy to generate sounds such as rhythm sound-effects sound or effects sound-vibrato.

Secondly, it is difficult to change a waveform of output sound and store data of predetermined waveforms into a register. Further, a construction of the apparatus or software program becomes complicated in a case where a voice signal is produced in addition to an artificial sound produced by waveform data.

Thirdly, it is difficult to adjust a depth of modulation in frequency-modulation of output sound

Fourthly, it is difficult to generate far and near sound in accordance with simple software program.

Fifthly, it is difficult to generate sound of a predetermined waveform, although this is concerned with the second disadvantage.

Finally, it is difficult to divide a channel sound into left and right stereo sounds.

SUMMARY OF THE INVENTION

Accordingly, it is a first object of the invention to provide an apparatus for generating sound in which various kinds of sounds including rhythm sound-effects sound or effects sound-vibrato are generated.

It is a second object of the invention to provide an apparatus for generating sound in which a waveform of output sound is changed, data of predetermined waveform is stored into a register, and a voice signal is produced without inviting the complication of a construction or software program by waveform data.

It is a third object of the invention to provide an apparatus for generating sound in which a depth of frequency-modulation of output sound can be adjusted.

It is a fourth object of the invention to provide an apparatus for generating sound in which far and near sound is generated without inviting the complication of software program.

It is a fifth object of the invention to provide an apparatus for generating sound in which sound of a predetermined waveform is generated.

It is a sixth object of the invention to provide an apparatus for generating sound in which a channel sound is divided into left and right stereo sound.

According to a feature of the invention, an apparatus for generating sound comprises,

a plurality of sound generating channels each including means for storing waveform data at predetermined addresses,

means for mixing output sounds of said plurality of sound generating channels, and

means for controlling said means for storing to be accessed by a predetermined frequency whereby waveform data for generating one of said output sounds are read therefrom,

wherein said output sounds are generated in channels selected from said plurality of sound generating channels, and then mixed in said means for mixing to provide mixed sound.

-------------------------------------------------------------

Although the invention has been described with respect to specific embodiment for complete and clear disclosure, the appended claims are not to thus limited but are to be construed as embodying all modification and alternative constructions that may occur to one skilled in the art which fairly fall within the basic teaching herein set forth.

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