Apparatus and method for a modem for detecting a call waiting si

Details Apparatus and method for a modem for detecting a call waiting si Apparatus and method for a modem for detecting a call waiting si

1993-03-15

1994-02-15

Chan, Wing F.

Telephonic communications

Telephone line or system combined with diverse electrical...

Having transmission of a digital message signal over a...

379 97, 379 93, 379215, H04M 1100, H04M 342

Patent

active

052874010

ABSTRACT:
A method for having a modem detect a call waiting signal from a telephone network is described. A first signal detector generates a first signal when detecting a carrier signal from the telephone network, and generates a second signal when not detecting the carrier signal. If the first signal detector generates the second signal for a first predetermined time interval and if the first signal detector generates the first signal for a second predetermined time interval subsequent to the first predetermined time interval a second signal detector is connected to the telephone network to detect if energy is present from the telephone network for a third predetermined time interval subsequent to the second predetermined time interval. The call waiting signal is detected when (1) the second signal detector detects the energy from the telephone network throughout the third predetermined time interval, and (2) the second signal detector does not detect the energy from the telephone network after the third predetermined time interval. The apparatus in the modem for detecting the call waiting signal from the telephone network is also described.

REFERENCES:
patent: 4431867 (1984-02-01), Heatherington
patent: 4841561 (1989-06-01), Hill
patent: 4852151 (1989-07-01), Dittakavi et al.
patent: 4868863 (1989-09-01), Hartley et al.
patent: 4995074 (1991-02-01), Goldman et al.

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