Proceedings of the Acoustical Society of Korea Conference (한국음향학회:학술대회논문집)
- 1994.06a
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- Pages.957-962
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- 1994
IMPLEMENTATION OF REAL TIME RELP VOCODER ON THE TMS320C25 DSP CHIP
Abstract
Real-time RELP vocoder is implemented on the TMS320C25 DSP chip. The implemented system is IBM-PC add-on board and composed of analog in/out unit, DSP unit, memoy unit, IBM-PC interface unit and its supporting assembly software. Speech analyzer and synthesizer is implimented by DSP assembly software. Speech parameters such as LPC coefficients, base-band residuals, and signal gains is extracted by autocorrelation method and inverse filter and synthesized by spectral folding method and direct form synthesis filter in this board. And then, real-time RELP vocoder with 9.6Kbps is simulated by down-loading method in the DSP program RAM.
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