Method and apparatus for controlling the transition of an audio signal converter between two operative modes based on a certain characteristic of the audio input signal
US6766291B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 18, 1999 |
| Grant date | Jul 20, 2004 |
| Priority date | — |
| Expiry date | Jun 18, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04J3/17
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
The invention relates to a method and apparatus for controlling the transition of a bypass capable codec between operative modes, based on a certain characteristic of the audio data signal processed by the codec. The apparatus relies on a control signal to determine when the codec will switch from one mode to another. This control signal reflects a characteristic of the audio data signal received at the apparatus, such as the type of speech activity or the format of the audio data signal. When in the active (non-bypass) mode, the apparatus relies on an additional control signal to switch to the inactive (bypass) mode. This additional control signal is received from a control unit at a remote codec that indicates that the remote codec is also bypass capable, hence the decoder at the first codec and the encoder at the remote codec can switch to the inactive mode to pass between them the compressed data frames.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.