Ringback detection circuit

Details Ringback detection circuit Ringback detection circuit

2006-08-01

2006-08-01

Tran, Sinh (Department: 2615)

Telephonic communications

Supervisory or control line signaling

Using line or loop condition detection

C379S386000

Reexamination Certificate

active

07085370

ABSTRACT:
A ringback detector determines whether ringback by comparing measurements of a characteristic of the received signal, such as the energy of the received signal, to a threshold. The threshold is set initially to a low value and then updated based on the measurements of received signal. The measurements are then compared to the threshold to determine whether ringback is present. An output signal indicative of ringback is generated when ringback is present.

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