Method and system for detecting tape defects by transporting a t

Details Method and system for detecting tape defects by transporting a t Method and system for detecting tape defects by transporting a t

1987-02-24

1989-02-21

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Magnetic

Magnetic information storage element testing

324226, 242186, 360 742, G01R 3312, G11B 1548, G03B 104, B65H 5938

Patent

active

048068616

ABSTRACT:
A method and an apparatus for detecting a defect of a magnetic tape which is loaded in a dictating machine for recording and reproducing dictations. In the event of initialization, the tape is automatically transported in a fast forward mode for a predetermined period of time and, then, a counter is loaded with an initial value. Thereafter, the tape is rewound while, at the same time, the counter counts reel rotation detection pulses. The tape is decided to be defective when the count of the counter at beginning of tape does not lie in a predetermined range, and free from defects when the count lies in the predetermined range. In an operation mode after the initialization, presence/absence of the pulses is detected. If the pulses are present, the count of the counter is compared with a predetermined reference value and, when the count is greater or smaller than the reference value, the tape is decided to be defective while, when the pulses are absent, the tape is decided defective if the count is not close to the reference value. The pulses are derived from a particular reel which is to take up a tape in a playback mode.

REFERENCES:
patent: 4553182 (1985-11-01), Narita

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