High definition television using 1125- line scans is now under advanced development in Japan. The image quality is comparable to 35mm motion picture film. Within the next few years HDTV receivers with video disc or cassette players will undoubtedly be available on the market.
The developers of HDTV recognized the impracticality of the full bandwidth (30 megahertz) distribution. Therefore, they have developed a bandwidth reduced transmission format called "MUSE" that requires 8.3 megahertz bandwidth in a continuous channel. This signal cannot be received by a standard NTSC receiver.