Variable speed playback controller for a video tape recorder

Details Variable speed playback controller for a video tape recorder Variable speed playback controller for a video tape recorder

1983-07-29

1986-02-04

Richardson, Robert L.

Dynamic magnetic information storage or retrieval

Record editing

360 101, 360 103, 360 73, 358323, H04N 5782, G11B 500, G11B 2700

Patent

active

045689865

ABSTRACT:
A magnetic tape transport controller for a magnetic recording and reproducing apparatus in which a pilot signal for tracking control having four different frequencies is recorded on a magnetic tape by a rotary magnetic head and the magnetic tape is transported in a playback mode at a different tape speed than that in a recording mode. The tape transport controller has means for detecting an amplitude change of a specific one of signals derived by frequency-converting a reproduced pilot signal and controlling the tape speed such that the frequency of the amplitude change is maintained at a predetermined frequency. It also has a phase control loop to control the tape speed such that a phase of the specific signal coincides with a phase of a reference signal. In the playback mode in which the tape is transported at the different speed than that in the recording mode, frequencies of a local pilot signal used to frequency-convert the reproduced pilot signal are switched in the opposite order to that of the switching of the frequencies in the recording mode. A detection circuit which detects a difference between two frequency converted signals of different frequencies and amplifies the difference inverts a polarity of an output signal for each track switching in a standard speed playback mode and does not invert the polarity in a variable speed playback mode.

REFERENCES:
patent: 3959819 (1976-05-01), Kubo
patent: 4318140 (1982-03-01), Shigeta

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