Digital sound generating system permitting a shared use of a har

Details Digital sound generating system permitting a shared use of a har Digital sound generating system permitting a shared use of a har

1997-01-16

1999-03-30

Hudspeth, David R.

Data processing: speech signal processing, linguistics, language

Speech signal processing

Synthesis

84603, 84604, G10L 918, G10H 700

Patent

active

058901191

ABSTRACT:
A digital sound generating system is provided which is capable of, in addition to generating a tone (first waveform data), recording or reproducing PCM sound data representing a human voice or sound of a music piece lasting for a relatively long time (second waveform data). To this end, in the tone generating process, tone waveform sample data is read out from a waveform RAM on the basis of address data given from an address calculating section and is then output as an analog signal via an interpolating section and D/A converter. In reproduction of PCM sound data, the PCM sound data supplied via a CPU interface is transferred using the waveform RAM as a buffer and is then supplied outside of the system through a same channel as in the tone generating process. In recording of PCM sound data, a high-frequency-component removing process is performed, by a filtering calculating section, on PCM sound data received via an A/D converter so as to prevent unwanted aliasing noise. The resultant filtered PCM sound data is then transferred using the waveform RAM as a buffer and output via the CPU interface.

REFERENCES:
patent: 5087043 (1992-02-01), Billings et al.
patent: 5121668 (1992-06-01), Zegan et al.
patent: 5209665 (1993-05-01), Billings et al.
patent: 5247130 (1993-09-01), Suzuki
patent: 5389729 (1995-02-01), Hiramatsu
patent: 5430242 (1995-07-01), Morita

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