Circuit for counting the number of crossed over tracks by an opt

Details Circuit for counting the number of crossed over tracks by an opt Circuit for counting the number of crossed over tracks by an opt

1991-11-14

1993-09-28

Heyman, John S.

Electrical pulse counters, pulse dividers, or shift registers: c

Systems

Comparing counts

369 4428, 369 4434, G11B 700, G06M 300

Patent

active

052492133

ABSTRACT:
In an optical disk apparatus, a circuit for counting the number of tracks crossed by an optical head comprises a first storage means for storing a sampling value obtained for each predetermined sampling cycle, a second storage means for storing a sampling value obtained for the immediately preceding sampling cycle and a comparator means for comparing the first and second values each stored within said first and second storage means. If the value obtained by this comparator means is smaller than a predetermined value, then the first value is selected as the count of the number of crossed tracks, and if the opposite is the case, then the second value is selected as such.

REFERENCES:
patent: 4716557 (1987-12-01), Utani
patent: 5073885 (1991-12-01), Ito et al.
patent: 5157645 (1992-10-01), Takahara et al.

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