Method device and system for an efficient noise injection process for low bitrate audio compression
US5692102A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 26, 1995 |
| Grant date | Nov 25, 1997 |
| Priority date | — |
| Expiry date | Oct 26, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L19/028
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
The present invention provides a device, method and system of noise injection to maximize compressed audio quality while enabling bitrate scalability. It includes at least one of an encoder and a decoder. The encoder includes a zero detection unit, coupled to receive a frequency domain quantized signal, for determining a control signal that indicates whether noise injection is implemented and a normalization computation unit, coupled to receive at least unquantized signal values and the control signal, for determining a normalization term in accordance with the control signal. The decoder includes a zero detection unit, coupled to receive a frequency domain quantized signal, for determining a control signal that indicates when noise injection is active and a noise generation and normalization unit, coupled to receive a normalization term and the control signal, for generating, normalizing, and injecting a predetermined noise signal where indicated by the control signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.