Digital mobile telephone communication method, communication channel switching method, and mobile station and base station for implementing same methods
US5740531A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 7, 1995 |
| Grant date | Apr 14, 1998 |
| Priority date | — |
| Expiry date | Jul 7, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W92/10
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
Data signals such as a pseudo noise pattern and character data are transmitted along with voice signals over one voice signal channel, thereby allowing an accurate measurement of communication channel quality during communication or enabling concurrent transmission of both voice and character information over one communication channel. At the transmitting end, a silence interval is detected by a voice detector, and a selector is controlled so that a PN pattern, with a start signal and an end signal appended at the start and end thereof, is substituted in the silence interval. At the receiving end, the start signal and end signal are detected by a silence notification frame detector, and a selector is controlled so that background noise is substituted in the intervening period.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.