Dynamic magnetic information storage or retrieval – Monitoring or testing the progress of recording
Patent
1981-12-07
1983-11-01
Canney, Vincent P.
Dynamic magnetic information storage or retrieval
Monitoring or testing the progress of recording
360 8, 360 27, G11B 2736
Patent
active
044132883
ABSTRACT:
A signal indicative of tape tension or of recording of signal on tape is generated in a helical-scan recorder. A test signal having a particular frequency characteristic is recorded by rotating heads at a high head-to-tape speed. A fixed playback head downstream from the headwheel picks up the test signal converted in frequency by the ratio of the reading speed to the writing speed, and applies it to a detector. The detector is a synchronous detector which receives at a second input terminal a frequency-divided sample of the test signal which controls demodulation by the synchronous detector. The frequencies of the input signals to the phase detector differ by a small amount, so that an output signal can always be generated no matter what the phase of the input signal. The rate of pulsation of the output signal is indicative of tape tension.
REFERENCES:
patent: 3225135 (1965-12-01), Osawa et al.
patent: 3369082 (1968-02-01), Hibbard
patent: 3404223 (1968-10-01), La Violette
U.S. patent application Ser. No. 216,170, filed 12-15-80 in the name of R. A. Dischert entitled, "Recording of Timing Signals Synchronous with a Rotary Recording Member".
U.S. patent application Ser. No. 201,053, filed 10-27-80 in the name of H. R. Warren entitled, "Timed-Base Error Reduction in Portable VTR".
Canney Vincent P.
Meise William H.
RCA Corporation
Whitacre Eugene M.
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