Apparatus for adaptively encoding input digital audio signals from a plurality of channels
US5627937A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 23, 1995 |
| Grant date | May 6, 1997 |
| Priority date | — |
| Expiry date | Feb 23, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B1/665
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A novel apparatus, capable of adaptively encoding input digital audio signals from N number of channels, comprises N number of filters for filtering the input digital audio signals, respectively; a first estimator for estimating a first parameter for each of the input digital audio signals; a second estimator for estimating perceptual entropies of the respective frames for each of the input digital audio signals based on the first parameter, to thereby derive a mean and a standard deviation of a first frame group, and for generating second frame groups including F number of frames for each of the N number of channels; a first bit allocation unit for determining bits for each of the second frame groups based on the perceptual entropies for the second frame groups and mean and standard deviation parameters and for generating bit allocation information corresponding to the determined bits for the second frame groups; a second bit allocation unit for determining bits for the respective subbands of each frame included in each of the second frame groups based on the first parameter and the generated bit allocation information; N number of quantizers for quantizing the filtered audio sign…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.