Method and apparatus for speech coding
US4964169A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 15, 1989 |
| Grant date | Oct 16, 1990 |
| Priority date | — |
| Expiry date | Feb 15, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L19/10
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A low bit rate speech coding method and implementing apparatus in which a linear predictive coding (LPC) speech synthesizer receives an excitation sequence comprised of pulses having selected amplitudes at predetermined positions within a frame to minimize the weighted mean square error between the synthetic speech produced by the LPC synthesizer and the input speech. Pulse locations and the pulse amplitudes at the respective locations are determined by a sequential processing technique in which the amplitude and location of each pulse are determined in accordance with the previously determined amplitudes and locations of the pulses preceeding the present pulse in the same frame; and specifically by determining the amplitude g.sub.k and location l.sub.k of a new pulse in a frame from selected pulses S at locations k-1 through k-S close to location l.sub.k. The number S of preceeding pulses used to determine the pulse at location l.sub.k is selected such that the distance between the Sth pulse preceeding the pulse at location l.sub.k affects the determination of the pulse at l.sub.k while pulses prior to the Sth pulse have no appreciable effect on the determination of the pulse at l…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.