Buffering speech signals in a TASI system
US4382296A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 22, 1980 |
| Grant date | May 3, 1983 |
| Priority date | — |
| Expiry date | Dec 22, 2000 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04J3/177
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A time assignment speech interpolation (TASI) system includes a speech buffer comprising storage packets which are assigned to the individual channels as required for the storage of the signals of each off-hook channel. For each inactive channel, the signals are stored sequentially and cyclically in one packet. When the channel becomes active, the sequential storage of signals continues in this and in further packets as required, signals stored before detection that the channel had become active being retained in the first packet to accommodate the response time of a speech detector of the system. Clipping of speech signals is thereby avoided. The channel is assigned a transmission facility and channel-to-facility assignment information is transmitted, following which the signals of the relevant channel are read sequentially from the buffer packets and transmitted via the facility. Freeze-out of speech signals is reduced because there is a variable delay between storage of signals in the buffer and reading therefrom; reading takes place only after a transmission facility has become available and has been assigned to the channel. At the end of each speech burst an end-of-record sign…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.