Apparatus for demodulating and decoding multi-level amplitude mo

Details Apparatus for demodulating and decoding multi-level amplitude mo Apparatus for demodulating and decoding multi-level amplitude mo

1990-10-01

1993-08-03

Psitos, Aristotelis

Dynamic magnetic information storage or retrieval

Modulating or demodulating

360 46, G11B 2006, G11B 509

Patent

active

052334791

ABSTRACT:
An apparatus for demodulating and decoding a multi-level amplitude modulation signal used to convey digital data, such as a QAM signal, having amplitude modulated carrier components differing in phase. The apparatus derives demodulated data values from that signal, and derives from average values of sets of these data values a set of compensated reference point data respectively corresponding to signal reference points of the multi-level modulation signal which are expressible as a symbol constellation in the I-Q plane. The compensated reference point data are used to obtain correct digital code values from the demodulated data, even if there is considerable distortion of the multi-level amplitude modulated signal, as is the case for such a signal when recorded and reproduced from a magnetic recording medium.

REFERENCES:
"An Experimental Digital VTR Capable of 12 Hour Recording" by Yamamitsu et al; IEEE Transactions on Consumer Electronics, vol. CE-33, No. 3, Aug. 1987 pp. 240-248.
"An Analytical Approach To The Standardization of Digital Videotape Recorders" by Jurgen K. R. Heitmann; SMPTE Journal; Mar. 1982; pp. 229-232.
"An Experimental Digital Video Recording System" by L. M. H. E. Driessen et al; IEEE Transactions on Consumer Electronics, vol. CE-32, No. 3, Aug. 1986; pp. 362-370.

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