Patent ID: 7218357

Claim:
An NTSC rejection filter comprising: a frequency shifter to shift the spectrum of a digital television (DTV) input signal, respectively, by a video carrier frequency offset, a color subcarrier frequency offset, and an audio carrier frequency offset, thereby creating a video carrier basebanded signal, a color subcarrier basebanded signal, and an audio carrier basebanded signal; a lowpass filter to estimate video carrier signal strength, color subcarrier signal strength, and audio carrier signal strength, respectively, from the video carrier basebanded signal, the color subcarrier basebanded signal, and the audio carrier basebanded signal; an interference signal synthesizer to create video carrier, color subcarrier, and audio carrier interference rejection signals, based respectively on the estimated video carrier, color carrier, and audio carrier signal strengths; and an adder to subtract the video carrier, color subcarrier, and audio carrier interference rejection signals from the DTV input signal.