This paper introduces the digital filter design technology used in the new text phone, which uses the dsPIC33F series microprocessor. The design is carried out using the dsPIC microcontroller-specific digital filter auxiliary design software package, and the filter is optimized by combining the best CSD coding technology with the Horner algorithm. The experimental results show that the optimized filter greatly shortens the time required for filtering calculation and can better meet the requirements of real-time communication of the system.
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