Magnetic recording and reproducing system with tape-to-head spee

Details Magnetic recording and reproducing system with tape-to-head spee Magnetic recording and reproducing system with tape-to-head spee

1975-01-29

1977-01-11

Cardillo, Jr., Raymond F.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Synchronizing moving-head moving-record recorders

360 73, 360 85, H04N 578, G11B 1554, G11B 2710

Patent

active

040030903

ABSTRACT:
Apparatus is provided for controlling the phase and speed of a motor for driving the rotary magnetic heads of a video tape recorder. An output of a signal generator, for example, a sawtooth wave, having a frequency corresponding to the rotational speed of the motor is compared with an external reference signal, for example, a 60 Hertz power line signal. A difference in frequency generates a varying error voltage whose polarity is indicative of the error direction. Relatively large or prolonged frequency errors result in an error voltage waveform having an abrupt and relatively large change. This error voltage is differentiated to create relatively large pulses of polarity depending on the direction of the error voltage. The relatively large pulses either charge or discharge a capacitor, the output of which changes the current to the motor so as to reduce the relatively large frequency error to a range suitable for handling by a conventional combined position and velocity servo system.

REFERENCES:
patent: 3097267 (1963-07-01), Clark et al.
patent: 3174090 (1965-03-01), Hall
patent: 3187092 (1965-06-01), Shashoua et al.
patent: 3270130 (1966-08-01), Hurst et al.
patent: 3478178 (1969-11-01), Grace
patent: 3705840 (1972-12-01), Kosugi

Affiliated with

Also associated with

Rating

Magnetic recording and reproducing system with tape-to-head spee does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Magnetic recording and reproducing system with tape-to-head spee, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Magnetic recording and reproducing system with tape-to-head spee will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1747723