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Symbol generator for phase modulated system

  • US 4,745,628 A
  • Filed: 04/15/1986
  • Issued: 05/17/1988
  • Est. Priority Date: 04/15/1986
  • Status: Expired due to Fees
First Claim
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1. A filter for filtering digital data, comprising:

  • means for receiving a digital data stream containing the digital data;

    memory means for storing digital representations of analog waveform segments in predetermined addressable locations, said waveform segments corresponding to the cross-correlation of a predetermined filter function with a predetermined sequence and number of adjacent data bits, there being a plurality of different sequences of adjacent data bits with each predetermined sequence of adjacent data bits corresponding to a unique one of said waveform segments;

    address means for examining a frame of adjacent data bits in said data stream, said frame equal in length to said predetermined sequence and number of adjacent data bits, said address means generating an address for addressing one of said waveform segments corresponding to said predetermined number of adjacent data bits in said frame; and

    means for assembling said addressed waveform segments into an analog filtered waveform, each of said waveform segments having a duration equal to the duration of each of the data bits in said digital data stream, each increment by one data bit of said data stream providing a new frame for examining by said address means.

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