Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1986-10-21
1988-06-21
Cardillo, Raymond F.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
360 331, 360 77, 360 84, 360137, 369 53, 369 55, G11B 2000, G11B 2736
Patent
active
047528435
ABSTRACT:
A tracking indication system of a VCR to make a recognition to a user whether or not a precise tracking of a video head is achieved. The invention includes a peak value detecting and holding circuit for detecting and holding in a predetermined time a peak value of the reproduction output signals, a level shift circuit for lowering an output of said peak value detecting and holding circuit to a predetermined level, a LPF for filtering the reproduction output signal, a differential amplifier whose a non-inverting terminal is connected to an output of said level shift circuit and an inverting terminal is connected to an output of said LPF to amplify a difference voltage between output signals of said level shift circuit and said LPF, and a LED which is activated or deactivated by a transistor being closed or open in response to an output signal of said differential amplifier.
REFERENCES:
Harry Kybet, Video Tape Recorders, Howard W. Sams & Co., 1974, pp. 220-221.
High Fidelity, vol. 36, No. 2, Feb. 1986, Test Reports: JVC HR-D566U HQ VHS Hi-Fi VCR, pp. 23-30.
Cardillo Raymond F.
Gold Star Co. Ltd.
Robertson David L.
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