H - Electricity – 02 – P
Patent
H - Electricity
02
P
352/21.1
H02P 29/00 (2006.01)
Patent
CA 1048146
SPEED AND PHASE CONTROL SYSTEM ABSTRACT OF THE DISCLOSURE In video reproducing apparatus having a rotating head, a pulse generator produces pulses synchronously with the rotation of the head. A counter begins counting clock signals at the time of each of the pulses and continues counting until the next pulse. The final count at the end of each counting cycle is converted to an analog signal to control the speed of ro- tation of the head. The phase angle of the head is controlled by control pulses recorded on the tape, which are compared with pulses from the pulse generator to affect incrementally the same speed control mechanism. The starting count of each counting cycle is varied in accordance with the time between successive control signals so that the final count will be the same as long as rotation of the head is synchronous with the control signals. This allows the length of counting cycles to vary if the tape is run at a different speed than normal during the recording and permits the speed to be controlled during playback without adversely affecting the phase. The starting count can be determined by counting clock signals between suc- cessive control signals and using the count thus obtained to set the initial count value for counts made during the time between successive pulses from the pulse generator.
210385
Hashizaki Kazuo
Moriya Ryusuke
Na
Sony Corporation
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