This paper points out that if the f s=2f sc of sub-Nyquist Sampling and DPCM_encoding is used for TV signal, the bit rate may be more compressed and transmission band is reduced.

• 本文指出，若在有效区内对电视信号采用亚奈奎斯特取样，并采取DPCM编码，就可以大大压缩码率，降低传输带宽。