US3700790A — Color television cameras

Claim 1

Independent Claim 179 words

A registration system for use with a color television camera of the component camera tube type comprising means for comparing the amplitude of each of two camera tube video component output signals fed thereto with the same two predetermined reference signals and for producing from the comparison of each video component signal with the reference signals two digital signals, the amplitude of one of which indicates whether the video signal is above or below one of the reference levels and the amplitude of the other of which indicates whether the video signal is above or below the other reference level, means for determining when a component camera tube video output signal has passed from one reference level to another at a faster than a predetermined speed and comparison means for comparing digital signals representative of different video outputs and corresponding to a transition at a faster than said predetermined speed and for producing as a result of the comparison, signals to be used in connection with at least one of the tubes to correct for errors in registration thereof.

Claim 2

Dependent Claim 179 words

A registration system for use with a color television camera of the component camera tube type comprising means for comparing the amplitude of each of two camera tube video component output signals fed thereto with the same two predetermined reference signals and for producing from the comparison of each video component signal with the reference signals two digital signals, the amplitude of one of which indicates whether the video signal is above or below one of the reference levels and the amplitude of the other of which indicates whether the video signal is above or below the other reference level, means for determining when a component camera tube video output signal has passed from one reference level to another at a faster than a predetermined speed and comparison means for comparing digital signals representative of different video outputs and corresponding to a transition at a faster than said predetermined speed and for producing as a result of the comparison, signals to be used in connection with at least one of the tubes to correct for errors in registration thereof.

Claim 3

Dependent Claim 26 words

A registration system as claimed in claim 1 wherein the reference levels are substantially symmetrically spaced about the amplitude level of the video waveform representing ''''mid-grey.''''

Claim 4

Dependent Claim 80 words

A registration system according to claim 2 which includes means for sampling said digital signals under the control of a clock frequency and for storing the sampled signals for the period between clock pulses, the sampled signals being fed to said means for determining when a component camera tube signal has passed from one reference level to another at a faster than a predetermined speed, said determining means detecting whether said transitions occur during a predetermined number of clock pulses.

Claim 5

Dependent Claim 37 words

A registration system according to claim 3 wherein to provide horizontal registration said clock frequency is substantially in excess of the line frequency and to provide vertical registration said clock frequency is equal to said line frequency.

Claim 6

Dependent Claim 72 words

A registration system as claimed in claim 3 wherein the two digital signals produced by a first camera tube are each fed directly to and are sampled by a store and digital signals produced by each of the remaining camera tubes are fed via a routing switch in time division multiplex to a further two stores such that said remaining camera tubes are successively brought into registration with said first camera tube.

Claim 7

Dependent Claim 28 words

A registration system as claimed in claim 5 wherein the number of remaining camera tubes is two, and the routing switch is switched at one quarter field frequency.

Claim 8

Dependent Claim 18 words

A registration system as claimed in claim 3 wherein the said predetermined number of clock pulses is two.

Claim 9

Dependent Claim 51 words

A registration system as claimed in claim 3 wherein video signal transitions between the two reference levels which occur faster than or at said predetermined speed produce further signals derived from the aforesaid sampling of the digital signals and which are indicative of both the speed and polarity of the transition.

Claim 10

Dependent Claim 103 words

A registration system as claimed in claim 8 which includes means for comparing in pairs the signals derived from the sampling of the digital signals resulting from each video signal to determine whether a registration error is present by delaying one derived signal with respect to the other, and vice versa, by a predetermined amount to determine whether the pair of derived signals are out of registratIon by the said predetermined amount, and means are provided by which on detection of the said predetermined amount of misregistration in two video signal transitions of opposite polarity an output registration error correction signal is supplied.

Claim 11

Dependent Claim 62 words

A registration system as claimed in claim 9 wherein the said comparison means has a limited range which is such as to prevent the output of registration error correction signals when the signals to be compared are the result of two video signal transitions which have a degree of misregistration which is greater than a low multiple of the sampling pulse periods.

Claim 12

Dependent Claim 129 words

A registration system for use with a color camera having at least two different component camera tubes, comprising in combination: first and second input terminals to which the component video signals derived from said two different component camera tubes are applied; means connected to said first and second input terminals for determining the occurrence of video signals during a selected region of the picture area which video signals have amplitude excursions completely between selected levels occurring faster than a predetermined speed and for producing output signals in response thereto, said selected levels being within the range of normal video signals from the component camera tubes; and means controlled by said output signals for controlling at least one of said component camera tubes to correct for errors in registration therebetween.

Claim 13

Dependent Claim 129 words

A registration system for use with a color camera having at least two different component camera tubes, comprising in combination: first and second input terminals to which the component video signals derived from said two different component camera tubes are applied; means connected to said first and second input terminals for determining the occurrence of video signals during a selected region of the picture area which video signals have amplitude excursions completely between selected levels occurring faster than a predetermined speed and for producing output signals in response thereto, said selected levels being within the range of normal video signals from the component camera tubes; and means controlled by said output signals for controlling at least one of said component camera tubes to correct for errors in registration therebetween.

Claim 14

Dependent Claim 27 words

A registration system as defined in claim 11 wherein said means for determining produces different output signals in response to positive-going and to negative-going video signal excursions.

Claim 15

Dependent Claim 33 words

A registration system as defined in claim 12 wherein said means for determining includes bistable means for producing digital signal changes in response to video signal amplitudes which are at said selected levels.

Claim 16

Dependent Claim 22 words

A registration system as defined in claim 13 wherein said means for controlling is a logic circuit responsive to said digital signals.

Claim 17

Dependent Claim 65 words

A registration system as defined in claim 11 wherein said means for determining comprises bistable means associated with said first input terminal for producing digital signal changes in response to video signal amplitudes which are at said selected levels and bistable means associated with said second input terminal for producing digital signal changes in response to video signal amplitudes which are at said selected levels.

Claim 18

Dependent Claim 22 words

A registration system as defined in claim 15 wherein said means for controlling is a logic circuit responsive to said digital signals.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1975-10-24	1976-04-24	1976-10-24	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1979-10-24	1980-04-24	1980-10-24	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1983-10-24	1984-04-24	1984-10-24	$7700.00	Window Closed / Lapsed

Color television cameras

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