Digital-analog converter with plural coefficient transversal filter

A digital-to-analog converter comprising:

• a partial signal time series data generating section for delaying a unit pulse response signal into m time-delayed partial signals during a predetermined time interval T, and for digitally and repeatedly generating from each of the m time-delayed partial signals an item of time series numerical value, generating a total of m items of numerical values during every sampling period T/n, wherein n is >=3, and thereby generating a total of m*n items of numerical values every time interval T;
• a digital data storing section for storing, while shifting, m digital values of the latest m time-delayed partial signals generated during the predetermined time interval T;
• a digital computing section for multiplying each of the time series numerical values of each time-delayed partial signal by the digital values stored in said storing section corresponding to each of the m time-delayed partial signals, and for adding the multiplication results, thereby producing one digital sum for every T/n sampling period;
• a converter for converting said digital sums from the digital computing section into an analog section;
• and
• an input interface coupled to said digital data storing section wherein said input interface comprises:
• a bi-phase signal receiving circuit for receiving bi-phase modulated data series;
• a waveform shaping circuit coupled to said bi-phase signal receiving circuit;
• and
• a data format converting circuit coupled to said waveform shaping circuit.

A method for converting a digital signal into an analog signal comprising the steps of:

• delaying a unit pulse response signal into m time-delayed partial signals during a predetermined time interval T, and digitally and repeatedly generating from each of the m time-delayed partial signals an item of time series numerical value, generating a total of m items of numerical values during every sampling period T/n, wherein n is >=3, and thereby generating a total of m*n items of numerical values every time interval T;
• storing, while shifting, m digital values of the latest m time-delayed partial signals generated during the predetermined time interval T;
• multiplying each of the m time series numerical values of each time-delayed partial signals by the digital values corresponding to each of the m time-delayed partial signals, and adding the multiplication results to provide one digital sum every T/n sampling period;
• and
• converting the said digital sums into an analog signal.