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Tuner with switched analog and digital demodulators

  • US 6,348,955 B1
  • Filed: 02/23/1998
  • Issued: 02/19/2002
  • Est. Priority Date: 02/23/1998
  • Status: Expired due to Term
First Claim
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1. A method of operating a television receiver for receiving either analog or digital signals comprising:

  • providing an analog demodulator and a digital demodulator;

    providing RF switching means for selectively switching the tuner signal between the analog demodulator and the digital demodulator;

    developing an AGC signal from the selected one of the analog and digital demodulators;

    multiplexing the AGC signal with the tuner signal through the RF switching means;

    developing the AGC signal from the selected one of the demodulators; and

    wherein the multiplexing step is performed on the basis of the frequency difference between the tuner signal and the AGC signal;

    developing a first signal indicative of the type of tuner signal; and

    controlling the RF switching means with the first signal.

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