Circuit for separating simultaneously reproduced PCM and ATF sig

Details Circuit for separating simultaneously reproduced PCM and ATF sig Circuit for separating simultaneously reproduced PCM and ATF sig

1988-11-23

1990-10-16

Faber, Alan

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 191, 360 27, 360 32, 360 7701, 369 47, 369 59, G11B 5584, G11B 509, G11B 2010

Patent

active

049640003

ABSTRACT:
In an apparatus, such as, an 8-mm VTR, in which a pilot signal and a digital signal modulated by an information signal, and occupying frequency bands that overlap at least in part, are recorded together as an addition signal in a track on a recording medium; a D.C. component of the addition signal reproduced from the track is detected and compared, in a voltage comparator, with the level of the reproduced addition signal so as to provide the digital signal as an output of the comparator, and such output of the voltage comparator is subtracted from the reproduced addition signal so as to provide the pilot signal without error by reason of the digital signal. Further, the pilot signal and cross-talk from adjacent tracks obtained from the first-mentioned subtraction is, in turn, subtracted from the reproduced addition signal for obtaining the digital signal therefrom, and the D.C. component of the digital signal obtained from the second subtraction is detected and compared with the level of the digital signal obtained from the second substration for obtaining therefrom the digital signal with any errors therein due to the pilot signal and other cross-talk from adjacent tracks being suppressed.

REFERENCES:
patent: 4509083 (1985-04-01), Nakano
patent: 4748517 (1988-05-01), Shibata et al.

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