The Journal of the Acoustical Society of Korea (한국음향학회지)
- Volume 1 Issue 1
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- Pages.54-59
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- 1982
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- 1225-4428(pISSN)
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- 2287-3775(eISSN)
A 4800 BPS LPS Vocoder with Improved Exitation
개선된 여기신호의 4800BPS LPC 보코우터
Abstract
We present an improved 4800 bps LPC vocoder system that virtually eleminates the buzzy effect from synthetic speech. Excitation signal in the new system is formed by adding high-pass filtered pitch pulses or random noise to a baseband residual signal that has been coded by pitch predictive PCM. Since the baseband residual is used as a part of excitation, the system is also robust to V/UV and pitch errors. According to our informal listening tests, the synthetic speech of the new system does not have the buzzy effect. As a result the vocoder speech quality is more natural than that of a conventioinal LPC vocoder.
Keywords