Transmultiplexer
US4237551A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 22, 1978 |
| Grant date | Dec 2, 1980 |
| Priority date | — |
| Expiry date | Dec 22, 1998 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04J4/005
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A transmultiplexer and method for use in a telephone system for translating information between time division and frequency division multiplexed formats. The transmultiplexer includes discrete cosine transform processor means connected to receive a linearly coded time division multiplexed signal representing a plurality of information channels for transforming the time division signal into a frequency division multiplexed signal and also includes weighting network means for weighting the transformed signal with predetermined real coefficients thereby forming a frequency division multiplexed signal corresponding to said time division multiplexed signal. The weighting network means are connected to receive a second multi-channel frequency division multiplexed signal for weighting the frequency signal with predetermined real coefficients thereby forming a weighted signal. An inverse discrete cosine transform processor transforms the weighted signal into a multi-channel time division multiplexed signal corresponding to the frequency division multiplexed signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.