Low bit-rate pattern coding with recursive orthogonal decision of parameters
US4724535A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 16, 1985 |
| Grant date | Feb 9, 1988 |
| Priority date | — |
| Expiry date | Apr 16, 2005 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L19/10
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Instead of an excitation pulse sequence producing circuit which is used according to prior art in calculating locations of excitation pulses and pulse amplitudes thereof, an excitation pulse sequence parameter producing circuit is used in a low bit-rate pattern coding device in recursively giving delays of the respective pulse locations to a discrete impulse response sequence to provide a system of delayed impulse responses and in transforming the delayed impulse response system into an orthogonal set of set elements. Meanwhile, the pulse locations are determined with element amplitudes or factors calculated for the respective system elements by the use of the system elements and each segment of a discrete pattern signal sequence. The pulse locations and the element amplitudes are used as parameters descriptive of the excitation pulses. Alternatively, the pulse locations are determined one at a time after quantization of each of the recursively determined element amplitudes. Preferably, the discrete impulse response sequence and the segment are weighted in consideration of auditory or like sensual effects. In a counterpart decoder, the pulse amplitudes are calculated by the use of …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.