Over-sampling digital analogue converter with variable sampling frequency

Over-sampling digital analogue converter with variable sampling frequency

CN
  • CN 1,201,491 C
  • Filed: 12/31/2001
  • Issued: 05/11/2005
  • Est. Priority Date: 12/31/2001
  • Status: Active Grant
First Claim
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1. A variable sampling frequency cross the sampling digital analogue converter, it is characterized in that:

  • can handle the input signal of different sampling frequencies, this is crossed the sampling digital analogue converter and comprises;

    One upconverter with fixing multiplying power M raising frequency, produced sampled signal with aforementioned input signal;

    One wave digital lowpass filter, the radio-frequency component of crossing sampled signal of the aforementioned upconverter of filtering, and with first rate output data;

    One data buffer receives the output data of aforementioned wave digital lowpass filter with aforementioned first rate, and with one second speed output data;

    One modulator reads data with aforementioned second speed from the aforesaid data buffer, and carries out modulation;

    One digital analogue converter converts the output signal of aforementioned modulator to anaiog signal;

    AndOne analogy low pass filter with the radio-frequency component filtering of aforementioned anaiog signal, produces output signal.

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