Digital subchannel transceiver for transmitting data

Details Digital subchannel transceiver for transmitting data Digital subchannel transceiver for transmitting data

2003-10-15

2010-02-16

Hoang, Thai D (Department: 2416)

Multiplex communications

Communication techniques for information carried in plural...

Combining or distributing information via frequency channels

C375S272000

Reexamination Certificate

active

07664142

ABSTRACT:
A system for transmitting subchannel data over the same media as high speed data, especially DC balanced high speed data. A digital transmitter receives subchannel data and modulates it onto a subchannel carrier as the host signal in the preferred embodiment using frequency shift keying. The FSK subchannel carrier is added by superposition to the high speed data signal. Because of the ability to have very narrow bandwidths for the passbands of digital IF filters, the receiver is more sensitive and less susceptible to the need for tuning to accommodate manufacturing variations in the rise times of the high speed data signals.

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