Telephone signal cancellation circuit, digital broadcasting...

Details Telephone signal cancellation circuit, digital broadcasting... Telephone signal cancellation circuit, digital broadcasting...

2006-11-30

2010-02-16

Nguyen, Simon D (Department: 2618)

Telecommunications

Wireless distribution system

C455S067130, C455S278100, C455S283000, C455S296000

Reexamination Certificate

active

07664455

ABSTRACT:
A telephone signal cancellation circuit, a digital broadcasting reception circuit and a portable digital broadcasting reception apparatus is provided. The telephone signal cancellation circuit, includes a signal coupler for separating a part of a reception signal, a telephone signal selection filter for passing a telephone signal among signals from the signal coupler, a phase shifter for performing phase inversion on the telephone signal among the signals from the telephone signal selection filter, and a combiner for combining the signal from the phase shifter and the reception signal, and canceling the telephone signal included in the reception signal.

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