Communications terminal apparatus capable of detecting wide rang

Details Communications terminal apparatus capable of detecting wide rang Communications terminal apparatus capable of detecting wide rang

1998-03-25

2000-08-01

Woo, Stella

Telephonic communications

Telephone line or system combined with diverse electrical...

To produce visual-graphic copy

379386, H04M 1100

Patent

active

060977965

ABSTRACT:
A communications terminal apparatus capable of detecting a busy tone by measuring time periods of a periodic tone state and off-tone state is provided. The apparatus includes a data transmitter and receiver, memory for storing first and second reference time ranges, first and second timers for measuring tone and off-tone state time periods of a signal on a telephone line, respectively, and a busy tone detector. The busy detector detects a busy tone by determining whether the measured tone and off-tone state time periods are within the first and second reference time ranges, respectively, and determining whether the signal alternately includes the measured tone and off-tone time periods.

REFERENCES:
patent: 5101428 (1992-03-01), Koue
patent: 5479501 (1995-12-01), Lai
patent: 5483593 (1996-01-01), Gupta et al.
patent: 5642406 (1997-06-01), Gahang

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