要求对一段数据序列进行哈夫曼编码，使得平均码长最短，输出各元素编码和编码后的数据序列。
①组成序列的元素是[0-9]这10个数字，每个数字其对应的4位二进制数表示。比如5对应0101，9对应1001。
②输入数据序列的长度为256。
③先输出每个元素的编码，然后输出数据序列对应的哈夫曼编码序列。(Design a 1MHz FIR low pass filter.
Huffman coding is required for a section of data sequence to make the average code length the shortest, and the output of each element encoding and the encoded data sequence.
The elements of the sequence are the 10 Numbers [0-9], each of which corresponds to a 4-bit binary representation.
Let's say 5 is equal to 0101, and 9 is equal to 1001.
The length of the input data sequence is 256.
First output the encoding of each element, and then output the data sequence corresponding Huffman coding sequence.
Requirements:
(1) clock signal frequency 16MHz;
(2) input signal bit width of 8bits, symbol rate of 16MHz
Requirements in Matlab FIR filter floating-point and fixed-point simulation, and determine the FIR filter tap coefficient
(4) write the test simulation program.)