G - Physics – 11 – B
Patent
G - Physics
11
B
352/21.1, 352/30
G11B 15/14 (2006.01)
Patent
CA 1071757
ABSTRACT OF THE DISCLOSURE Head switching control apparatus for use in video signal processing apparatus of the type comprised of plural rotary trans- ducer heads which scan successive tracks across a recording medium, each track having recorded therein a composite video signal com- prised of video information, horizontal synchronizing signals, and a vertical blanking interval. The head switching control apparatus functions to selectively connect individual transducer heads, one at a time, to video signal receiving circuitry. This head switch- ing control apparatus is comprised of a position pulse generator for generating position pulses representing the relative positions of the transducer heads with respect to the recording medium. A bi-state circuit has first and second states and is responsive to successive position pulses for switching between its first and second states as the transducer heads rotate into predetermined positions relative to the recording medium. Switching circuitry is coupled to the transducer heads to electrically connect indi- vidual ones of the heads to the video signal receiving circuitry. A synchronizing signal separator is coupled to the video signal receiving circuitry and separated the synchronizing signals in- cluded in the vertical blanking interval from the video signal. A switch pulse generator is coupled to the synchronizing signal separator and to the bi-state circuit and is responsive to the first and second states of the bi-state circuit for generating switch pulses which are synchronized with the separated synchroniz- ing pulses. These switch pulses are applied to the switching cir- cuitry for selectively actuating that circuitry so as to connect the transducer heads, one at a time, to the video signal receiving circuitry.
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