Feedback-controlled speech processor normalizing peak level over vocal tract glottal pulse response waveform impulse and decay portions
US6067512A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 31, 1998 |
| Grant date | May 23, 2000 |
| Priority date | — |
| Expiry date | Mar 31, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L25/75
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A speech processor for processing speech signals in a manner that minimizes the peak to average ratio of a vocal tract response waveform of the speech signal with minimal loss of intelligibility of speech reproduced from the processed waveform. This is accomplished, in general terms, by providing a speech processor for providing an approximately constant peak level within periods of a vocal tract response waveform. The speech processor may include a feedback-controlled signal compressor multiplier and an input signal delay means. The attack, hang and decay parameters of the speech processor are determined in accordance with typical vocal tract response characteristics to optimize the balance between compression of the vocal tract response waveform and introduction of harmonics into the resulting signal. The gain of the speech processor is controlled in accordance with the input signal representing the vocal tract response waveform and is limited to prevent signal distortion when little or no signal is present. The input to the speech processor signal multiplier is delay compensated by an amount determined in accordance with the attack time and the sample rate of the input signal, s…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.