Digital circuit transmission device
US7546238B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 4, 2002 |
| Grant date | Jun 9, 2009 |
| Priority date | — |
| Expiry date | Sep 10, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L47/38
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A digital line transmission unit can carry out switching between speech codecs during the same call to achieve balance between making effective use of a line and a high sound quality without bringing about a feeling of discomfort in a user by the switching. It includes in an encoder a first speech codec 7 with a high sound quality and a high bit rate, a second speech codec 8 with a reasonable sound quality but a low bit rate. It carries out switching between these speech codecs in response to the control information an operation monitoring controller 4 obtains by making a decision as to the traffic volume of the bearer line 111. The switching between the speech codecs is made during a speech pause a speech burst detector 31 in a signal detector 3 detects in an input speech signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.