Vertical motion detector
First Claim
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1. A vertical motion detector for a TV system comprising:
- horizontal motion detector means generating horizontal motion signals indicating that horizontal motion has occurred on a TV display which the horizontal motion detector means is monitoring, said horizontal signals being produced on the output of said horizontal motion detector means as portions of a series of signal samples which represent elements of the TV display;
a shift register circuit comprising at least one shift register with an output, and with an input of said at least one shift register connected to the output of the horizontal motion detector means, each of said shift [register] registers having the same number of locations within it as there are information samples available from the horizontal motion detector means to represent one horizontal line of the TV display which the horizontal motion detector means is monitoring;
clock signal means synchronized with the signal samples on the output of the horizontal motion detector means and connected to each shift register of said shift register circuit to produce one change of position in [a] each shift register signal for every signal sample on the output of the horizontal motion detector means; and
an AND gate circuit comprising at least one AND gate with inputs of said at least one AND gate connected to the output of the horizontal motion detector means and the output of a shift register of the shift register circuit, the output of said at least one AND gate producing a signal indicating vertical motion whenever the horizontal motion detector means generates a motion signal on its output simultaneous with an output signal from the shift register to which said at least one AND gate is connected.
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Abstract
A vertical motion detector for a TV system motion detector. The circuit operates by delaying each motion indicator signal by multiple units of the time required for one full horizontal line sweep. If vertical motion occurs, the delayed indicator will output from the delay at the same time another indicator occurs. These signals are fed to multiple AND gates so that several coincident signals are required to produce an alarm. A switching circuit permits selection of the number of vertical motion indicators required for an alarm.
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Citations
6 Claims
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1. A vertical motion detector for a TV system comprising:
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horizontal motion detector means generating horizontal motion signals indicating that horizontal motion has occurred on a TV display which the horizontal motion detector means is monitoring, said horizontal signals being produced on the output of said horizontal motion detector means as portions of a series of signal samples which represent elements of the TV display; a shift register circuit comprising at least one shift register with an output, and with an input of said at least one shift register connected to the output of the horizontal motion detector means, each of said shift [register] registers having the same number of locations within it as there are information samples available from the horizontal motion detector means to represent one horizontal line of the TV display which the horizontal motion detector means is monitoring; clock signal means synchronized with the signal samples on the output of the horizontal motion detector means and connected to each shift register of said shift register circuit to produce one change of position in [a] each shift register signal for every signal sample on the output of the horizontal motion detector means; and an AND gate circuit comprising at least one AND gate with inputs of said at least one AND gate connected to the output of the horizontal motion detector means and the output of a shift register of the shift register circuit, the output of said at least one AND gate producing a signal indicating vertical motion whenever the horizontal motion detector means generates a motion signal on its output simultaneous with an output signal from the shift register to which said at least one AND gate is connected. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification