Today, 30 years ago, on April 24, 1995 (March 25, 1995), China's satellite digital broadcasting was launched. On April 24, 1995, the Ministry of Broadcasting Film and Television decided that Central People's Radio, in order to expand the coverage of the program and improve the quality of broadcasting, officially began to transmit single and stereo radio programs through the satellite channels of the central television station. The use of this technology marks the significant progress of our country's broadcasting means. When broadcasting programs of Central People's Radio in the past, the quality of the signal through short waves, frequency and microwave forms is difficult to guarantee. The Institute of Broadcasting Sciences has started to study the development of NICAM-728 technology since 1993, is to use the transmitting satellite transmitters for television programs