| 摘要 |
A recursive digital filter for digit-serial signals comprises a digit-serial adder having an augend input port to which successions of m-bit-wide digits of a digital-serial filter input signal are supplied in order of progressively greater significance, having at least a first addend input port, and having a sum output port; digit-serial multiplier apparatus having a multiplicand input port connected from the sum output port of said digit-serial adder and having a product output port for supplying a weighted response to signal received at its multiplicand input port; and means for applying the weighted response to the first addend input port of the digit-serial adder so as to be in word alignment with the digit-serial input signal to the augend input port of the digit-serial adder. In various filtering systems the recursive digital filter for digit-serial signals is preceded by a to-digit-serial converter to convert digit-serial format input signal supplied in a different digital signal format, is succeeded by a from-digit-serial converter to convert the digit-serial filter response to a different digital signal format, or is both preceded by a to-digit-serial converter and succeeded by a from-digit-serial converter.
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