Patent ID: 7593065

Claim:
A method for channel filtering of an analog or digitally modulated TV signal ( 125 ), comprising: receiving the TV signal that includes a video signal component, a sound signal component, and a video carrier signal at a video carrier frequency; bandshifting the TV signal ( 125 ) to an intermediate frequency at the video carrier frequency (f BT ), generating an intermediate frequency signal (S IF ), where the intermediate frequency signal (S IF ) is I/Q-demodulated with a signal (S(f BT ; 0°)) at a video carrier frequency (f BT ) into an in-phase signal (I), and with a signal (S(f BT ; 90°)) shifted in phase by a phase angle π/2 relative to the signal (S(f BT ; 0°)) and at a video carrier frequency (f BT ) into a quadrature signal (Q); filtering the in-phase signal (I) in a first Hilbert filter (HF-I) of a Hilbert filter pair (HF-I, HF-Q) having an even symmetrical impulse response (h 1 (L−n)=h 1 (n)) in order to obtain a Hilbert-filtered in-phase signal (I H ); filtering the quadrature signal (Q) in a second Hilbert filter (HF-Q) of the Hilbert filter pair (HF-I, HF-Q) having an uneven symmetrical impulse response in order to obtain a Hilbert-filtered quadrature signal (Q H ); and adding the Hilbert-filtered quadrature signal (Q H ) to the Hilbert-filtered in-phase signal (I H ) in order to obtain a video output signal (S Video ) and/or subtracting the Hilbert-filtered quadrature signal (Q H ) from the Hilbert-filtered in-phase signal (I H ) in order to obtain a sound output signal (S Sound ′).