Method and circuit arrangement for filtering analog or digital modulated TV signals

The Invention relates to a method and a Schaltungsanordnungg for channel filtering of analog or digitally modulated TV signal (125) comprising an image signal (125b), a sound signal (125a) and an image carrier signal (BT) with a picture carrier frequency (fBT) At which the TV signal (125) to a Intermediate frequency (2ndIF), an intermediate frequency signal (SIF) Is making, implemented. to interference adjacent TV channels to suppress, the invention provides, the intermediate frequency signal (SIF) with a Signal (S (fBT; 0 °)) at the picture carrier frequency (fBT) In an in-phase signal (I) and with a to the signal (S (fBT; 0 °)) to a Phase angle of π / 2 phase shifted signal (S (fBT; 90 °)) with the picture carrier frequency (fBT) Into a quadrature signal (Q) z. B. to demodulate by means of an I / Q demodulator (3). The in-phase signal (I) is by means of a first, a straight symmetrical impulse response (HI(Ln) = hI(N)) having the Hilbert filter (HF-I) of a Hilbert filter pair (HF-I, HF-Q) gefilte, a Hilbert-filtered in-phase signal (IH) to receive. Similarly Way, the quadrature signal (Q) by means of a second, a odd symmetric impulse response (hQ(Ln) = - hQ(N)) having the Hilbert filter (HF-Q) the Hilbert filter pair (HF-I, HF-Q) filtered to produce a filtered hilbert Quadrature signal (QH) to obtain. The Hilbert filtered Quadrature signal (QH) Is z. B. by an adder (21) to the ...