Verfahren zur Aufzeichnung bzw. Wiedergabe magnetischer Aufzeichnungen und Vorrichtung zum Durchfuehren dieses Verfahrens

959,000. Recording television signals. PHILIPS ELECTRICAL INDUSTRIES Ltd. July 10, 1962 [July 13, 1961], No. 26492/62. Heading G5R. A helical-wrap magnetic tape recorder which records complete fields on each oblique track, 9-11, has the wrap-angle reduced sufficiently below 360 degrees by guides 7, 8 to leave a blank region 12, the drive of the head-carrier 4 being so related to the field synch-pulses that the tape 6 is removed from the recording influence of the head 3 just before the synch-pulse is due. Alternatively, where the wrap is a full 360 degrees, the synch-pulses recorded in the region 12 (the sound and control-track region) are erased. The output of tachometric means (Fig. 4 not shown) in which a sensing magnetic head identifies the phase of an iron insert in a disc mounted on the headdriving means, is compared with the synch-pulses in the signal to be recorded to so phase the headdrive motor that the region 12 is correctly placed along one edge of.the tape. Compensating means eliminate pulses occurring due to the interruption of recording, comprising a self-oscillating demodulator on playback which generates an innocuous output during the interruptions of playback.