Device and method for hum signal compensation in analog telephony signals

摘要

A device comprises an interface for transferring an analog telephony signal. Further, the device comprises a compensation circuit which detects a hum signal in the analog telephony signal, generates a compensation signal opposite in phase with the hum signal, and combines the compensation signal with the analog telephony signal.

主权项

1. A network termination device in which a hum signal is generated from power mains, the network termination device comprising:
a Plain Old Telephony System, POTS, interface configured to transfer an analog telephony signal, a digital broadband interface for transferring digital audio signals with a digital communication network; a signal processing circuit configured to accomplish signal conversion between the analog telephony signal and the digital audio signals; and a compensation circuit configured to detect the hum signal in the analog telephony signal, to generate a compensation signal which is opposite in phase with the hum signal, and to combine the compensation signal with the analog telephony signal.