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Optimization of the receiving-filtering of magneto-optical recorded EFM-coded digital signals

: Makai, B.; Hohne, H.D.

Frequenz 40 (1986), Nr.7, S.166-74
ISSN: 0016-1136
ISSN: 2191-6349
Fraunhofer HHI ()
digital filters; digital signals; modulation; video and audio discs; high storage density; digital audio; erasable compact disc; eight to fourteen modulation; magneto-optical recorder; efm-coded digital signal; receiving filters; signal-to-noise ratio

Because of the very high storage density obtainable, erasable magneto-optical recording is of major interest for use in digital audio. In an experiment with an erasable compact disc (CD) the eight to fourteen modulation code is used for digital recording in order to be compatible with non-erasable CD already available. In this paper the signal, received at the pick-up of a magneto-optical recorder, is considered to be equivalent to an EFM-coded digital signal transmitted by a digital channel. Several receiving filters are compared. With the proposed receiving-filtering an improvement of the signal-to-noise ratio is obtainable.