Signal processing and transmission method and system of electronic equipment

The invention provides a signal processing and transmission method and system for electronic equipment, and the method comprises the steps: collecting a video signal, and carrying out the compression processing of the video signal; the link of compression processing comprises DCT (Discrete Cosine Transform); the method comprises the following steps: acquiring a DC coefficient of each transformation block in a currently compressed video frame in a DCT (Discrete Cosine Transform) process, forming a DC coefficient matrix by the DC coefficient corresponding to each transformation block, generating a first matrix and a second matrix according to a first preset key, and reversely adjusting the first matrix according to the second matrix to generate a third matrix; and encrypting the DC coefficient matrix according to the third matrix to obtain an encrypted sequence. The random matrix is generated to perform random encryption on the DC coefficient matrix of each frame so as to obtain the encryption sequence and perf