Telecommunications – Transmitter and receiver at separate stations – With control signal
Patent
1997-12-10
2000-03-14
Chin, Wellington
Telecommunications
Transmitter and receiver at separate stations
With control signal
455 43, 455 72, H04B 100
Patent
active
060384301
ABSTRACT:
A method and apparatus are provided that improve data transmissions in a wireless network, optimized for the transmissions of voice signals, by companding data signals electrically about a spectral shaping module in data handling devices, preferably modems, at both the transmitting and receiving ends of the wireless network. At the transmitting end, the companding is performed by a compressor, electrically preceding a data de-emphasis module, and an expander, electrically succeeding the data de-emphasis module. At the receiving end, the companding is performed by a compressor, electrically preceding a data pre-emphasis module, and an expander, electrically succeeding the data pre-emphasis module. At both ends of the wireless network, companding better serves to facilitate the transmission of data across the wireless network because complimentary functions are performed symmetrically at both ends and because data streams are more complimentarily coupled to, and from, wireless transceivers that similarly perform companding electrically about voice and data streams between the transmitting and receiving ends. Such wireless transceivers being spectrally optimized for voice signal transmissions wherein spectral advantages occurring for voice signals causes spectral disadvantages for data signals within the same transceiver.
REFERENCES:
patent: 4661851 (1987-04-01), Muterspaugh
patent: 4704726 (1987-11-01), Gibson
patent: 5058202 (1991-10-01), Leveque
patent: 5226178 (1993-07-01), Eastmond et al.
patent: 5507033 (1996-04-01), Dolan
Alelyunas Carl
Buxton Bert
Thomson Larry Steve
3Com Corporation
Chin Wellington
Jackson Blane J.
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