Modem with low part count and improved demodulator

Details Modem with low part count and improved demodulator Modem with low part count and improved demodulator

H - Electricity

04

M

379/5

H04M 11/06 (2006.01) H04L 27/10 (2006.01) H04L 27/30 (2006.01)

Patent

CA 1186080

"MODEM WITH LOW PART COUNT AND IMPROVED DEMODULATOR" Abstract of the Disclosure An FSK modem for coupling a standard data port (50) to a telephone line (45) in which the signal path between the phone line and the data port passes through a processor (55). The same frequency detection apparatus (83, 192, 180) is used to both demodulate FSK encoded signals and detect the presence of a telephone ringing signal on the line. A pair of impedances (161, 162) provide alternate paths either through an input filtering network (167) or bypassing the network (135, 69) in a manner which allows the ring signals to pass directly to the input (69) of the frequency detector while assuring that only filtered FSK signals reach the input. Also shown is the use of the same frequency synthesizing apparatus (86, 253, 259) for generating FSK output signals and high group DTMF signals with appropriate switchable attenuation (88) provided in this signal path.

404513

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