Modem apparatus comprising ringing signal detector for outputtin

Details Modem apparatus comprising ringing signal detector for outputtin Modem apparatus comprising ringing signal detector for outputtin

1996-02-09

1998-05-26

Kuntz, Curtis

Telephonic communications

Telephone line or system combined with diverse electrical...

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

379 28, 375222, H04M 1100

Patent

active

057578931

ABSTRACT:
In a modem apparatus including a modem circuit, operatively connected to a computer and a communication line, a ringing signal detector detects a ringing signal received through the communication line, generates a detection signal, and then, outputs the detection signal to the modem circuit. A register receives from the host computer instruction data for instructing the ringing signal detector to output the detection signal, and then, stores therein the instruction data. Then, the ringing signal detector outputs the detection signal to the modem circuit when the instruction data is stored in the register. A pseudo ring signal generator outputs a pseudo ring signal in response to instruction data being stored in the register by the host computer. A signal frequency selection circuit instructs and controls the pseudo ring signal generator, in response to the instruction data to select the signal frequency of the pseudo ringing signal. A timing chart controller may also be used to control the pseudo ringing signal generator according to instruction data being written into the register by the host computer.

REFERENCES:
patent: 4841561 (1989-06-01), Hill
patent: 5003573 (1991-03-01), Agah et al.

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