Low bit rate speech signal transmitting system using an analyzer and synthesizer with calculation reduction
US5734790A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 25, 1996 |
| Grant date | Mar 31, 1998 |
| Priority date | — |
| Expiry date | Jul 25, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L25/06
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
In a speech signal encoding system comprising a maximum similarity series extracting unit (50) for producing a series of excitation pulses appearing at an equidistant time interval and an identical amplitude, the maximum similarity series extracting unit sums up, as a waveform, a series of autocorrelation coefficients to produce a series of summation result coefficients. The autocorrelation coefficients correspond to polarized pulses which are equal to one another in pulse interval and pulse amplitude. The polarized pulses form a plurality of pulse sequences which have phases different from one another. The maximum similarity series extracting unit extracts a polarity of each of the polarized pulses by the use of a dynamic programming method using a degree of an accumulated similarity as an evaluation measure and selects, as the excitation pulse series, one of the pulse sequences which has a maximum waveform similarity between the summation result coefficient series and a series of cross correlation coefficients.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.