Vertical synchronization pulse separator

Claim 2

In an electronic video system capable of translating a composite signal containing synchronization pulses and other video information, a synchronization pulse separator comprising first means for periodically removing a portion of the composite signal, the removed portions containing the synchronization pulses and the remaining portions containing other video information, and second means for subtracting said remaining portions of the signal from which the synchronization pulses have been removed by the first means from the composite signal containing synchronization pulses, the output of the second means being separated synchronization pulses.

Claim 3

The system of claim 1 in which said first means comprises circuit means susceptible of forward bias and susceptible of reverse bias and arranged so that the portion of the composite signal received when said circuit means is forward biased is not transmitted to said second means.

Claim 4

The system of claim 2 in which the composite signal includes vertical synchronization pulses and in which said circuit means is further arranged so as to be forward biased by horizontal synchronization pulses, the output of said second means being separated vertical synchronization pulses.

Claim 5

The system of claim 1 wherein the first means is responsive to a periodic input the frequency of which is at least equal to the frequency of the synchronization pulse and which is present whenever a synchronization pulse is present.

Claim 6

The system of claim 1 wherein the first means is responsive to horizontal synchronization pulses and removes those portions of the composite signal that occur at the same time as the horizontal synchronization pulses.

Claim 7

In an electronic video system capable of receiving and translating a composite video signal containing synchronization pulses, a synchronization pulse separator comprising first means for periodically removing a portion of the composite signal, the removed portion containing the synchronization pulses and the remaining portions containing other video information, and second means for generating a pulsed output corresponding to the synchronization pulses, said second means being arranged to receive first and second inputs and to subtract the second from the first, the first input being the composite signal-containing synchronization pulses and the second input being a signal containing other video information from which the synchronization pulses have been removed by the first means, the output of the second means being a series of separated vertical synchronization pulses.

Claim 8

In an electronic video system capable of receiving and translating a composite video signal containing synchronization pulses, a synchronization pulse separator comprising first means for periodically removing a portion of the composite signal, the removed portion containing the synchronization pulses and the remaining portions containing other video information, and second means for generating a pulsed output corresponding to the synchronization pulses, said second means being arranged to receive first and second inputs and to subtract the second from the first, the first input being the composite signal-containing synchronization pulses and the second input being a signal containing other video information from which the synchronization pulses have been removed by the first means, the output of the second means being a series of separated vertical synchronization pulses.

Claim 9

The system of claim 6 in which said separator further comprises third means for maintaining the amplitude of the pulses of said pulsed output uniform, said third means comprising a zener diode and a low-pass filter.

Claim 10

The system of claim 6 in which said differential amplifier of said second means comprises first and second transistors arranged so that the base of said first transistor is connected to receive said first input and the base of said second transistor is connected to receive said second input.

Claim 11

The system of claim 8 in which the emitters of said first and second transistors are connected to each other.

Claim 12

An electronic video system capable of translating a composite signal containing vertical synchronization pulses and other video information, said system including a video amplifier and a vertical synchronization pulse separator, the separator comprising a clamping means responsive to horizontal synchronization pulses for removing vertical synchronization pulses from a composite signal received from the video amplifier, and a differential amplifier means for generating a pulsed output corresponding to the vertical synchronization pulses, the differential amplifier means being responsive to two inputs one of which is a signal from which the vertical synchronization pulses have been removed by the clamping means and the other of which is a complete composite signal received froM the video amplifier.

Claim 13

An electronic video system capable of translating a composite signal containing vertical synchronization pulses and other video information, said system including a video amplifier and a vertical synchronization pulse separator, the separator comprising a clamping means responsive to horizontal synchronization pulses for removing vertical synchronization pulses from a composite signal received from the video amplifier, and a differential amplifier means for generating a pulsed output corresponding to the vertical synchronization pulses, the differential amplifier means being responsive to two inputs one of which is a signal from which the vertical synchronization pulses have been removed by the clamping means and the other of which is a complete composite signal received froM the video amplifier.