Because word-length of register is finite. It is necessary to consider the question about the finite word-length effect during the devising digitfilter.
由于寄存器的字长是有限的，因此要在数字滤波器的设计过程中考虑各种有限字长效应问题。
2
Has analyzed the FIR digit filter's basic principle, designs the FIR low pass filter under the MATLAB environment using the window box number, has realized the low pass FIR filter's design simulation.
This paper expatiates on the validity of this method and brings forward the preconditions of improving SNR and increasing the virtual digit of signal meterage by interpolation filter.