TV/FM receiver for multimedia applications

TV/FM receiver for multimedia applications

  • CN 1,284,360 C
  • Filed: 12/17/1996
  • Issued: 11/08/2006
  • Est. Priority Date: 01/10/1996
  • Status: Active Grant
First Claim
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1. receive the receiver of the received signal of the received signal of the first kind and second type, this receiver comprises:

  • The importation, the response received signal provides the frequency mixer input signal, and described importation comprises band pass filter, and is tunable in the frequency range that the described first and second type received signals occur;

    Frequency mixer, response frequency mixer input signal provides intermediate-freuqncy signal;

    First signal process unit of intermediate frequency when receiving described first kind received signal, is connected to described frequency mixer to handle described intermediate-freuqncy signal;

    AndSecond signal process unit of intermediate frequency when receiving the described second type received signal, is connected to described frequency mixer handling described intermediate-freuqncy signal,It is characterized in that;

    described band pass filter comprises tunable first resonant circuit, one tunable second resonant circuit, be used to switch in the device of the coupling between first and second resonant circuits, like this, described band pass filter is switchable, so that described first kind received signal is done different filtering with the received signal of described second type;

    Mutual inductance between first and second resonant circuits is switchable, with the coupling of change between subcritical state and supercriticality, if band pass filter switches to the described received signal of the described first kind is carried out filtering, then coupling is in subcritical state, if band pass filter switches to the described received signal of described second type is carried out filtering, then coupling was in critical condition.

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