Circuit arrangement and method for detecting unrecorded zones of

Details Circuit arrangement and method for detecting unrecorded zones of Circuit arrangement and method for detecting unrecorded zones of

1983-03-16

1984-11-20

Stephan, Steven L.

Dynamic information storage or retrieval

Information location or remote operator actuated control

Selective addressing of storage medium

369 33, G11B 338, G11B 1706

Patent

active

044843186

ABSTRACT:
An output signal from a photodetector (3) responsive to light reflected at a phonograph record (2) is differentiated to produce positive and negative differential pulses (b.sub.1+, b.sub.1-), and the positive differential pulse (b.sub.1+) is retarded by a time length substantially equal to the time difference between the positive and negative differential pulses (b.sub.1+, b.sub.1-), while the negative differential pulse (b.sub.1-) is inverted to be a positive signal (d). The retarded signal (c) is added to the positive signal (d) so that the amplitude of the positive signal (d) becomes greater than before when the timing of the positive signal matches with the retarded signal (c). A resultant sum signal (e) produced in this way will be compared with a reference value (V.sub.TH1) to detect only unrecorded zones thereby accurately distinguishing unrecorded zones from recorded zones. The circuit arrangement therefore, comprises a differentiator (4), a circuit (D.sub.1, D.sub.2) for separating the positive differential pulse (b.sub.1+) from the negative differential pulse (b.sub.1-), a delay circuit (6), an inverting circuit (7), an adder (8), and a comparator (9).

REFERENCES:
patent: 4079944 (1978-03-01), Durley et al.
patent: 4093832 (1978-06-01), Isaacson et al.
patent: 4375092 (1983-02-01), Yoshio
patent: 4375093 (1983-02-01), Takahashi

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