In quest of higher quality, stability, smaller size and lower cost, we have advanced from the age of vacuum tubes to that of transistors and then to that of ICs. And such technological progress has made it possible for us to make extensive use of digital technology in recording and in broadcast engineering.: At present, in the -package- sector, PCM recorders are used and digital disks are providing us with programs of high quality. In transmission systems, program circuits have been digitized, with the result that programs with high-quality sound can now beenjoyed on FM broadcasts throughout Japan. TV broadcasting via satellite has already been put into practice, in which the PCM system is adopted for sound. With this in mind, we would now like to consider the present condition and future outlook of digital equipment for professional use, focusing our attention on the complex broadcast technology in this system and also touching upon questions of recording techniques.
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