Patent ID: 6925170
Filing Date: 2005-08-02
Classification: H04M

Abstract:
1. A wire-bound telecommunication device comprising: terminals for coupling the device to a subscriber line of a telecommunication network, a transmission circuit, and a signal energy detecting arrangement that is configured to determine a time domain signal representing signal energy of a substantial entirety of the signal on the subscriber line in a predetermined time interval, wherein the signal energy detecting arrangement comprises, a first comparator, the first comparator comparing the signal on the subscriber line with an amplitude reference signal, and generating a signal at a first comparator output; an integrator, the integrator integrating the signal at the first comparator output at the predetermined time interval and generating an integrated output; and a second comparator, the second comparator comparing the integrated output with an energy reference signal, and generating a control signal at a second comparator output; wherein the telecommunication device operates according to a give signal protocol, the signal energy being determined during a least one predetermined expected signal interval; and wherein the signal protocol is a caller identification signal protocol and the expected signal interval comprises a tone alerting signal.