Circuit configuration for intermediate frequency demodulation an

Details Circuit configuration for intermediate frequency demodulation an Circuit configuration for intermediate frequency demodulation an

1995-07-31

1997-07-15

Lee, Michael H.

Television

Receiver circuitry

Demodulator

348737, 329327, 455337, H04N 5455

Patent

active

056488238

ABSTRACT:
A circuit configuration for intermediate frequency demodulation for a video signal processing device includes an intermediate frequency filter to which an input signal converted to an intermediate frequency is delivered, and a mixer for demodulation with a simulated video carrier. In a further branch, the video carrier is eliminated from the input signal by a bandpass and converted in an oscillator into reference signals being mutually phase offset by 90.degree.. A phase tracker ensures that the phase and frequency of the simulated video carrier are correct relative to the signal to be demodulated. The phase tracker contains in each of two branches a mixer and a low pass, through which a component separation of the video signal to be demodulated is carried out. The reference signals are weighted in further mixers with determined equisignal components and combined into the simulated video carrier.

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IEEE Publ. on Transactions on Consumer Electronics, vol. 37, No.4, Nov. 30, 1991, pp. 783-792, Brilka et al., "An Advanced 5V VIF-/SIF PLL for Signal Detection in TV Sets and VTRS".

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