news center

Technology: Compact cassette may threaten DAT

Technology: Compact cassette may threaten DAT

作者:尚殪  时间:2019-02-26 02:11:00  人气:

HILIPS is also working on a technique to make the conventional audio cassette a carrier for digital audio, but have refused to comment on it. This is politically sensitive because the promise of a digital compact cassette undermines the commercial potential of the completely new digital audio tape format, DAT, due to be launched round the world this year. Philips has been showing the digital compact cassette system in strict confidence to executives from Japanese electronics companies, record companies and firms which produce conventional analogue music cassettes. The aim is to record stereo on a standard compact cassette in both analogue and digital form, with the cassette playing back normally on existing cassette recorders. In future, a new generation of digital recorders would use the digital code to reproduce the same music in higher quality. Engineers in the industry believe that Philips hopes to achieve this by superimposing a high-frequency signal on the music and modulating its frequency with digital code. All analogue tape recorders already rely on a high-frequency signal, of around 75 kilohertz, to ‘bias’ the tape and help it to record audible frequencies. This bias frequency is too high to be heard, but a sensitive recorder might be able to decode any digital code it carried. The same engineers warn that if this is what Philips proposes, then however clever the theory,