Circuit for compensating the errors occurring when changing the

Details Circuit for compensating the errors occurring when changing the Circuit for compensating the errors occurring when changing the

1991-12-17

1994-05-03

Sniezek, Andrew L.

Dynamic magnetic information storage or retrieval

Monitoring or testing the progress of recording

360 64, 360 103, 358337, H04N 578

Patent

active

053092910

ABSTRACT:
A circuit for compensating the errors occurring when changing the playing back speed of a double azimuth 4-head VTR includes first and second switches for switching data retrieved by four heads and amplified in response to head switching signals, a comparator for comparing the output signals of the switches, an alternate delay circuit for receiving the head comparing switching signals of the comparator and the head switching signals to delay horizontal synchronization by 2H during performing head switching between fields and not during not performing the head switching, a multiplexer for generating control signals in response to the output signals of the alternate delay circuit and head switching pulses, a third switch for transmitting data in response to the control signals of the multiplexer, a high frequency output unit of a pre-amplifier for receiving the outputs of the third switch, and a time base correction (TBC) circuit for receiving the video signals of the high frequency output unit of the pre-amplifier to retrieve the previous 1H signals from a field memory and substitute so as to independently operate the clocks of a recording unit and a decoding unit, thereby compensating the horizontal and vertical timing errors of the signals provided by the alternate delay circuit.

REFERENCES:
patent: 4614985 (1986-09-01), Tsurata
patent: 4672469 (1987-06-01), Namiki et al.
patent: 5126892 (1992-06-01), Nagasawa et al.

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