Modem communication system having main and secondary channels

Details Modem communication system having main and secondary channels Modem communication system having main and secondary channels

H - Electricity

04

L

363/8

H04L 27/00 (2006.01) H04L 1/24 (2006.01) H04M 11/06 (2006.01)

Patent

CA 1297599

MODEM COMMUNICATION SYSTEM HAVING MAIN AND SECONDARY CHANNELS Abstract of the Disclosure A data modem communication system includes a data modem transmitter adapted to transmit data on a main channel at a relatively high bit rate and to transmit data at a relatively low bit rate on a secondary channel. At the receiver, a single analog- to-digital converter (54) supplies digital signals via a notch filter (58) to the main channel receiver (60) and to the secondary channel receiver (62) wherein a single IIR low-pass digital filter (110) is utilized for processing at three different sample rates to eliminate the main channel signal with frequency conversion taking place between processing at the first and second sample rates. The invention enables the provision of a reliable secondary channel while using a minimum amount of circuitry for complex-valued digital signal processing.

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