GB288237A - Systems for converting light energy into electrical energy and vice-versa - Google Patents

Systems for converting light energy into electrical energy and vice-versa

Info

Publication number
GB288237A
GB288237A GB1481/28A GB148128A GB288237A GB 288237 A GB288237 A GB 288237A GB 1481/28 A GB1481/28 A GB 1481/28A GB 148128 A GB148128 A GB 148128A GB 288237 A GB288237 A GB 288237A
Authority
GB
United Kingdom
Prior art keywords
aperture
photo
transmitter
picture
television
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
GB1481/28A
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.)
Electrical Research Products Inc
Original Assignee
Electrical Research Products Inc
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 Electrical Research Products Inc filed Critical Electrical Research Products Inc
Publication of GB288237A publication Critical patent/GB288237A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/14—Picture signal circuitry for video frequency region
    • H04N5/20—Circuitry for controlling amplitude response
    • H04N5/205—Circuitry for controlling amplitude response for correcting amplitude versus frequency characteristic
    • H04N5/208—Circuitry for controlling amplitude response for correcting amplitude versus frequency characteristic for compensating for attenuation of high frequency components, e.g. crispening, aperture distortion correction
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/14—Picture signal circuitry for video frequency region

Abstract

288,237. Electrical Research Products, Inc., (Assignees of Mohr, F.). April 6, 1927, [Convention date]. Copying-telegraphs; television. - Relates to television apparatus, copying telegraphs, optical phonographs and like apparatus in which a picture or record is scanned by an aperture moving relatively thereto, and comprises means for eliminating the blurring which arises from the finite width of the aperture. Thus in a television transmitter, Fig. 1, in which the optical projection of a film 1 illuminated by a lamp 2 is analysed by a disc 3 having spirally arranged apertures 3<a>, Fig. 1<a>, the current taken from the photo-electric cell 4 is proportional to the average illumination extending over the picture-element corresponding to an aperture 3<a> and consequently represents a blurred image. The invention is based on the following analysis : the horizontally moving aperture is regarded as made up of elementary vertical strips, each of which controls an elementary fraction of the photo-electric current which, for a definite scanning-speed, is a function of time. This function is the same in form but different in phase for different elementary strips, and the current due to the whole aperture is obtained by integrating across the aperture, with respect to phase. It is shown that, when the integration is carried out for each of the Fourier components into which the function may be resolved, the result depends on the width of the aperture, the wave-length of the component, and other factors : so that the finite size of the aperture differently affects different components. The blurring of the transmitted picture is attributed to this fact. The invention consists in the interposition of a filter 8 between the photo-electric cell 4 and output terminals a of the transmitter, and in a similar arrangement at the receiver, the filter being so calculated as to equalize the effect of the size of the aperture for all components. A single filter may compensate for the double distortion arising at the transmitter and the receiver.
GB1481/28A 1927-04-06 1928-01-16 Systems for converting light energy into electrical energy and vice-versa Expired GB288237A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US181533A US1768288A (en) 1927-04-06 1927-04-06 System for converting light energy into electrical energy and vice versa

Publications (1)

Publication Number Publication Date
GB288237A true GB288237A (en) 1929-04-16

Family

ID=22664689

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1481/28A Expired GB288237A (en) 1927-04-06 1928-01-16 Systems for converting light energy into electrical energy and vice-versa

Country Status (3)

Country Link
US (1) US1768288A (en)
FR (1) FR650658A (en)
GB (1) GB288237A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2633494A (en) * 1946-03-23 1953-03-31 Maynard D Mcfarlane Facsimile transmitting system

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE753440C (en) * 1935-02-21 1954-03-22 Walter Rogowski Dr Circuit to reduce the afterglow in television cathode ray tubes
US2984536A (en) * 1950-03-02 1961-05-16 A C Nielson Company System and apparatus for recording the listening habits of wave signal receiver users

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2633494A (en) * 1946-03-23 1953-03-31 Maynard D Mcfarlane Facsimile transmitting system

Also Published As

Publication number Publication date
US1768288A (en) 1930-06-24
FR650658A (en) 1929-01-11

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