Ring signal discriminator

Details Ring signal discriminator Ring signal discriminator

1987-03-09

1988-01-19

Dwyer, James L.

Telephonic communications

Special services

Call diversion

H04M 354

Patent

active

047208538

ABSTRACT:
An improvement to automatic answering and call forwarding features used in telephone communications which allows a user to remotely activate, modify, and deactivate these features. The improvement describes a transformerless means for coupling signals to and from the telephone line without compromising the operation of the telephone line. The apparatus employs a microprocessor controller (11) with memory (12), a tone encoder (15), a tone decoder (14), a voice synthesizer (16), a timer (13), a cassette interface (17), an RS232C interface (20), a switching matrix (21), and a line interface (22). Audio, pulse dial, and tone signals are routed among the components and the telephone line (51) by the switching matrix (21) and line interface (22). The line interface (22) provides a transformerless means for coupling signals to and from the telephone line (51) and also analyzes the status of, and signals present on, the telephone line (51).

REFERENCES:
patent: 4049916 (1977-09-01), Danner
patent: 4475009 (1984-10-01), Rais et al.

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