H - Electricity – 04 – B
Patent
H - Electricity
04
B
325/16, 379/5
H04B 1/40 (2006.01) H04L 1/00 (2006.01) H04L 5/14 (2006.01) H04L 27/00 (2006.01)
Patent
CA 1232021
Digital Signal Processor Modem Abstract of the Disclosure A dual speed, full duplex modem for transmitting and receiving data on a dialed-access telephone line includes a signal processor for storing samples corresponding to a sinusoidal waveform, for selecting samples at intervals determined by the mode in which the modem is operating to synthesize a signal for modulating by data for transmission, and for autocorrelating a received signal at a frequency determined by the mode In which the modem is operating to recover data from the received signal. The signal processor includes configuring input ports, and a microcomputer receivers instructions related to the mode in which the modem is to operate to output a mode-configuring word to the configuring Inputs. Conversion from the signal processor's digital output to the analog signal to the line and from the line's analog signal to the signal processor's digital input takes place through two time-division multiplexed coder-decoders. The stored sinusoid is mu-law compressed. The modem can dual tone, multiple frequency dial. The DTMF pair requires a different amplitude from the amplitude of the synthesized signal for modulating by data for transmission. A power series expansion of the required amplitudes of the DTMF tone pair permits both the synthesized signal for modulating by data for transmission and the tones of the DTMF pair to be calculated from the mu-law compressed sinusoid.
462458
Leung Tommy Y.
Waldron Mark A.
Cts Corporation
Riches Mckenzie & Herbert Llp
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