AUTOMATIC TRACK FOLLOWING FEATURE FOR HELICAL VIDEO RECORDER

摘要

An automatic track following feature for use with a helical video recorder as shown in Figure 3 is disclosed which enables reproduction of video fields at normal speeds, fast and slow forward and reverse speeds, and at stop motion, wherein a mechanism 22 for moving a playback head 12 transverse to the helical tracks on a magnetic tape is provided in order to enable the head to remain centered on the track regardless of tape speeds and directions of movement. A ramp wave form signal is generated in a head position control network 104 for driving the head in response to a comparison of a signal based on the instantaneous tape speed with a reference speed indicating signal.