十进制数转换成二进制补码，并将结果写入txt。低通滤波器设计、多相滤波器组设计，并将系数写入txt或者coe文件，可用于FPGA设计-Decimal numbers into binary complement, and writes the result txt. Low-pass filter design, polyphase filter bank design, and coefficient writing or coe txt file that can be used for FPGA design