GB1417181A - Colour television cameras - Google Patents

Colour television cameras

Info

Publication number
GB1417181A
GB1417181A GB177772A GB177772A GB1417181A GB 1417181 A GB1417181 A GB 1417181A GB 177772 A GB177772 A GB 177772A GB 177772 A GB177772 A GB 177772A GB 1417181 A GB1417181 A GB 1417181A
Authority
GB
United Kingdom
Prior art keywords
tube
luminance
chrominance
control signal
signal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB177772A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
EMI Ltd
Original Assignee
EMI Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by EMI Ltd filed Critical EMI Ltd
Priority to GB177772A priority Critical patent/GB1417181A/en
Publication of GB1417181A publication Critical patent/GB1417181A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/10—Cameras or camera modules comprising electronic image sensors; Control thereof for generating image signals from different wavelengths

Abstract

1417181 Colour television EMI Ltd 15 Jan 1973 [14 Jan 1972] 1777/72 Heading H4F In a colour television camera using a separate luminance pick-up tube 3, the amplitude of the luminance signal Y H is compared at 7 with a luminance signal Y L derived at 11 from the red, green and blue outputs of the chrominance tube or tubes 4, to provide a control signal to maintain the ratio between these two luminance signals constant, if, for example, the picture content changes due to operation of a zoom lens. The luminance tube receives light passed through a central aperture in a mirror included in a beam splitter 2, the peripheral light being passed to chrominance tube or tubes 4. The control signal may alter the area of the aperture defined by an iris 1 to alter the amount of light incident on the chrominance tube or tubes 4 or beam splitter 2 may include onr or more variable optical elements controlled by the control signal. Alternatively or additionally the control signal may control the ratio of the gain of luminance amplifier 5 to the gains of chrominance amplifiers 8, 9 and 10. For a camera using a single chrominance tube 4, the luminance signals Y L and Y H may be compared in a further circuit to provide a signal to register the scans in luminance tube 3 and chrominance tube 4.
GB177772A 1972-01-14 1972-01-14 Colour television cameras Expired GB1417181A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB177772A GB1417181A (en) 1972-01-14 1972-01-14 Colour television cameras

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB177772A GB1417181A (en) 1972-01-14 1972-01-14 Colour television cameras

Publications (1)

Publication Number Publication Date
GB1417181A true GB1417181A (en) 1975-12-10

Family

ID=9727808

Family Applications (1)

Application Number Title Priority Date Filing Date
GB177772A Expired GB1417181A (en) 1972-01-14 1972-01-14 Colour television cameras

Country Status (1)

Country Link
GB (1) GB1417181A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2847858A1 (en) * 1977-11-04 1979-05-10 Ampex HYBRID COLOR TV CAMERA
GB2126828A (en) * 1982-09-09 1984-03-28 Link Electronics Ltd Camera tube aperture compensation

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2847858A1 (en) * 1977-11-04 1979-05-10 Ampex HYBRID COLOR TV CAMERA
FR2408263A1 (en) * 1977-11-04 1979-06-01 Ampex HIGH PERFORMANCE COLOR TELEVISION CAMERA USING ANALYZER TUBE AND TRANSISTORIZED DETECTORS
GB2126828A (en) * 1982-09-09 1984-03-28 Link Electronics Ltd Camera tube aperture compensation

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PLNP Patent lapsed through nonpayment of renewal fees