Audio coding and quantization method
US6725192B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 15, 1999 |
| Grant date | Apr 20, 2004 |
| Priority date | — |
| Expiry date | Jun 15, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L19/002
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
In an audio coding and quantization method, each of spectral subband components of an audio signal is quantized whereby a quantizer step size for a related one of spectral subbands is obtained from a bit allocation. The bit allocation is controlled for each subband by using a psychoacoustic model. During the controlling, a quantization of frequency domain values of a related one of blocks is calculated through a first control loop, the first control loop being repeated until a bit rate requirement is met. A quantization noise for each subband, produced within the first control loop, is calculated through a second control loop, the second control loop being repeated until a masking requirement is met. The first control loop and the second control loop are alternately performed for the related block such that both the requirements are met, and, thereafter, an output vector of quantized frequency domain values is finally produced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.