Audio signal coding with a signal adaptive filterbank
US5732189A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 22, 1995 |
| Grant date | Mar 24, 1998 |
| Priority date | — |
| Expiry date | Dec 22, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B1/665
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An audio coding technique is presented, which utilizes a time varying non-uniform filterbank in conjunction with a Perceptual Audio Coder. The non-uniform filterbank is formed from a plurality of uniform filter bank sections, and a transition filter. Each uniform filterbank section covers a portion of a predetermined frequency axis, and the transition filter is utilized to cover the remainder of the predetermined frequency axis. Aliasing terms introduced at the band edges of the transition filter are cancelled to obtain an overall transfer function for the non-uniform filterbank, which has linear phase and is approximately flat. Use of the non-uniform filterbank permits an increase in temporal resolution, which results in an improved coding technique over a wide range of frequencies.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.