Band-by-band full duplex communication
US6963642B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 30, 1999 |
| Grant date | Nov 8, 2005 |
| Priority date | — |
| Expiry date | Dec 30, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M9/082
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A telephone includes a first channel having a microphone input and a line output, a second channel having a line input and a speaker output, and each channel having a plurality of band pass filters with their outputs coupled to a multiplex circuit. The multiplex circuit selects subsets of the signals in each channel in accordance with the magnitudes of the signals in each band. Thus, full duplex operation is provided in accordance with the spectral content of each channel. In one embodiment of the invention, the multiplex circuits initially allocate alternate bands within each channel and complementary bands between the channels, thereby emulating a complementary comb filter. Thereafter, bands are allocated according to spectral content.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.