Method and apparatus for asymmetric communication of compressed speech
US6324515A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 2, 1998 |
| Grant date | Nov 27, 2001 |
| Priority date | — |
| Expiry date | Jun 2, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L19/00
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
This invention relates to a method and an apparatus for processing digital audio signals that may reduce the signal degradation occurring when the signal is exchanged between two communication terminals equipped with vocoders in a communication network. The solution proposed by this invention is to provide a communication terminal with a vocoder including a decoder section provided with a plurality of decoding units. A switch activates a selected one of the decoding units in dependence of the format of the compressed audio signal data frames received from a remote communication terminal. This system allows the communication terminal to support a number of different speech compression formals. In order to achieve simplicity and low cost, the communication terminal is provided with a single encoding unit. This results in an asymmetric arrangement where the communication terminal has a large number of decoding units than encoding units. The great majority of the speech compression algorithms deployed in wireless and Internet telephony standards have the property that their speech decoders are of far less computational complexity than their respective speech encoder. Therefore, a low-c…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.