英语翻译Direct-Form FIR FilterThe filter coefficients of a direc

英语翻译
Direct-Form FIR Filter
The filter coefficients of a direct form FIR filter can be obtained from the difference equation (6).
The output of the FIR filter from (6) is a finite length weighted sum of the past inputs and the current input for a unit-sample response of h(nT).The filter inputs and coefficients are stored in 196NU page 00h memory from higher data address to lower data address as seen in Table 3 and Table4.The input samples x(n) and the coefficient’s h(n) can be stored in page 00h and y(n) computed for a6-tap FIR using the relation
y(n) = x(n)h(0) + x(n-1)h(1) +.x(n-5)h(5) (7)
The code listing for the macro version which has low code density but is execution limited and the in-line version which is optimized for fast execution but has higher code density is shown in Listing’s 1 and 2 respectively.The Figure 1 shows the network structure of a direct-form 6-tap FIR filter.
Conclusion
The implementation of a direct-form 6-tap nonrecursive FIR filter on the 80C196NU has been described.The use of an accumulator to speed up real time computations using the multiply and accumulate instructions with the saturation mode shows techniques to approximate an ideal FIR filter coefficients to minimize the effects of coefficient quantization and finite-length arithmetic.The architectural and instruction set features for optimum response based on code density and speed of code execution of the FIR filter were summarized.Assembly code listings for the macro and in-line implementation are listed.The 80C196 device can be used to implement recursive filters with the required response and is not limited to just nonrecursive filters.

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