Vocoder by-pass for digital mobile-to-mobile calls
US6272358A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 4, 1998 |
| Grant date | Aug 7, 2001 |
| Priority date | — |
| Expiry date | Jun 4, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M2207/18
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
Apparatus for performing a smooth by-pass of extra Vocoders in a mobile station to mobile station connection. Vocoders are used in mobile stations using digital signals to communicate with base stations. When the vocoded signals are to be transmitted over the public switched telephone network, they are normally converted into the kinds of signals such as 64 Kb per second pulse code modulation (PCM), used in the public switched network. In accordance with one preferred embodiment of this invention, when a connection is made between two mobile units, the connection is made via a separate asynchronous transfer mode (ATM) network. Arrangements are also available to switch between the ATM network and Vocoders connected to the public switched telephone network when it is necessary to transmit a PCM signal to a land based station, or other equipment. Advantageously, this arrangement allows switches between by-pass mode and non/by-pass mode to be made seamlessly without requiring a synchronous operation of that switch in the two switching systems involved in a connection, and therefore, further improves the voice quality during Vocoder by-pass because there is no disruption of the voice pa…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.