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Receiver for multicarrier signals protected from unwanted signals

  • US 4,509,206 A
  • Filed: 05/02/1983
  • Issued: 04/02/1985
  • Est. Priority Date: 05/04/1982
  • Status: Expired due to Fees
First Claim
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1. A multicarrier signal receiver comprising a high frequency circuit for receiving a plurality of modulated carrier signals and having an output providing a corresponding plurality of modulated intermediate frequency carrier signals, a circuit for the preselection and selective attenuation of the intermediate frequency carrier signals comprising a plurality of filters tuned to the intermediate frequency carrier signals, whose inputs are connected to the output of the high frequency circuit and whose outputs are connected to respective attenuators, each having a control input and an output, an adder responsive to said attenuator outputs and having a sum output, an intermediate frequency amplification circuit having an input connected to the output of the adder, and an output, a demodulation circuit comprising a plurality of signal demodulation paths have one path for each modulated intermediate frequency carrier signal respective, each path including a filter connected to the output of the intermediate frequency amplification circuit, in series with a detector-amplifier and a demodulator, each path further including an elementary detection circuit for detecting an unwanted or interfering signal having an input connected to the output of a respective demodulator and an output supplying a control signal characteristic of an appearance or disappearance of an unwanted signal for the corresponding carrier signal, the output of the detection circuit associated with a particular carrier signal being coupled to the control input of the corresponding attenuator.

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