Receiving apparatus and integrated circuit for receiving

Receiving apparatus and integrated circuit for receiving

  • CN 100,359,894 C
  • Filed: 08/03/2001
  • Issued: 01/02/2008
  • Est. Priority Date: 08/04/2000
  • Status: Active Grant
First Claim
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1. receiving equipment, be used to receive a signal that is re-used, wherein having one first aggregate of signal of one first many programme contents and one second aggregate with signal of one second many programme contents is carried out frequency division multiplexing and is sent out, and the signal that this receiving equipment is used for receiving from this extracts one described more than first programming content signal and described more than second programming content signal, and described receiving equipment comprises:

  • A circuit is used to form first and second local oscillated signals, and the frequency of these two local oscillated signals all is the centre frequencies between described first aggregate and described second aggregate, and its phase place has 90 °

    difference;

    One first mixer is used for according to described first local oscillated signal, is one first intermediate-freuqncy signal with the received signals frequency inverted;

    One second mixer is used for according to described second local oscillated signal, is one second intermediate-freuqncy signal with the received signals frequency inverted;

    One first phase-shift circuit, wherein said first intermediate-freuqncy signal is provided on it;

    One second phase-shift circuit, wherein said second intermediate-freuqncy signal is provided on it, and the phase-shift phase of its phase shift momentum and described first phase-shift circuit has 90 °

    difference;

    WithAn addition/subtraction circuit is used for carrying out an operation of addition and subtraction between the output signal of the output signal of described first phase-shift circuit and described second phase-shift circuit,Wherein by the processing in the described addition/subtraction circuit is switched to described addition or described subtraction, optionally from described addition/subtraction circuit, extracted with the corresponding intermediate-freuqncy signal of described first signal or with the corresponding intermediate-freuqncy signal of described secondary signalThis receiving equipment further comprises;

    An intermediate-frequency filter, the output signal of described addition/subtraction circuit is provided on it;

    WithA demodulator circuit, the output signal of described intermediate-frequency filter is provided on it,Wherein, by the processing in the described addition/subtraction circuit is switched to described addition or described subtraction, the signal of described more than first programme content or the signal of described more than second programme content are optionally extracted from described demodulator circuit,In wherein said first aggregate and described second aggregate each has a terrestrial radio ripple signal and satellite radio electric wave signal that is carried out frequency division,Described intermediate-frequency filter comprises first and second intermediate-frequency filters,Described demodulator circuit comprises first and second demodulator circuits,The output signal of described addition/subtraction circuit is provided on each of described first and second intermediate-frequency filters, the intermediate-freuqncy signal of the intermediate-freuqncy signal of described thus terrestrial radio ripple signal and described satellite radio electric wave signal from described first and second intermediate-frequency filters, extracted andIntermediate-freuqncy signal as the output signal of described first and second intermediate-frequency filters is provided to described first and second demodulator circuits respectively.

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