GB297078A - Improvements in or relating to television systems - Google Patents

Improvements in or relating to television systems


Publication number
GB297078A GB8351/28A GB835128A GB297078A GB 297078 A GB297078 A GB 297078A GB 8351/28 A GB8351/28 A GB 8351/28A GB 835128 A GB835128 A GB 835128A GB 297078 A GB297078 A GB 297078A
United Kingdom
Prior art keywords
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.)
Application number
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
Priority to US219404A priority Critical patent/US2166247A/en
Application filed by Electrical Research Products Inc filed Critical Electrical Research Products Inc
Publication of GB297078A publication Critical patent/GB297078A/en
Expired legal-status Critical Current



    • H04N5/00Details of television systems
    • H04N5/76Television signal recording
    • H04N5/84Television signal recording using optical recording
    • H04N5/843Television signal recording using optical recording on film
    • H04N5/846Television signal recording using optical recording on film the film moving intermittently


297,078. Electrical Research Products, Inc., (Assignees of Hartley, R. V. L., and Ives, H. E.). Sept. 14, 1927, [Convention date]. Television of back-ground details is improved, and increased illumination is obtained, by taking a kinematograph film of the scene to be transmitted and causing the film to control the television signals, these processes being cor.ducted in a continuous train. In addition or alternatively a photographic process is interposed at the television receiving station. The picture signals may be accompanied by signals derived from a phonographic film. In the transmitting apparatus, Fig. 2, the film 99 passes from a spool 103 through (a) a kinematograph camera 101, in which its movement is intermittent. (b) A sound recording device 110, in which its movement is continuous ; this comprises a source of light 113, a lens system 114, 115, and a light-valve 111 controlled by the microphone currents. (c) Developing and fixing tanks 121, 122; washing and drying arrangements may also be included in the apparatus if desired. (d) A kinematographic projector 130 providing intermittent movement; light parses from a source 136 through optical systems 137, 138, through the film 99 while still wet, and through a scanning disc 155 to a light sensitive cell 160 which controls the outgoing television signals. (e) A transmitter 140 for phonographic signals; light passes from a source 143 through an optical system 144 and the phonographic record on the film 99 to a light sensitive cell 170 which controls the out-going phonographic signals. (f) A storage spool 180 or other means for for disposing of the film. The receiving apparatus (Fig. 3, not shown) is generally similar to the transmitting apparatus and comprises means for passing a film through (a) a television receiver of known type adapted to project the signalled picture on to the film. (b) A sound recorder similar to the apparatus 110 for projecting the signalled sound-record on to the same film. (c) Developing and fixing tanks. (d) A kinematograph projector of known type for throwing the picture on to a screen visible to an audience. (e) Phonographic, apparatus similar to that shown at 140 for controlling a loud-speaker, and (f) Means for storing or otherwise disposing of the film. The receiving apparatus may also comprise (right-hand side of Fig. 1, not shown) switching arrangements whereby the television, phonographic and synchronizing currents can be diverted from the photographic receiver just described and applied to a television receiver of the known type which comprises a bank of lamps adapted to be successively illuminated under the control of a rotary distributer, and to an associated loud-speaker. The phonographic and kinematographic records may alternatively be impreseed on different films. In cases where the television signals but not the phonographic signals are subjected to the delay involved in developing the film, means are provided for delaying the reproduction of the sound. These may comprise (a) a telegraphone having an endless wire on which the sound record is continuously impressed, the record being erased after reproduction; or (b) a phonograph record of the disc type associated with recording and reproducing styli (Fig. 4, not shown). In cases where the photographic process is used at the transmitter only, the distortion which occurs may be corrected by the use of an amplifier having a suitable characteristic.
GB8351/28A 1927-09-14 1928-03-19 Improvements in or relating to television systems Expired GB297078A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US219404A US2166247A (en) 1927-09-14 1927-09-14 Electro-optical transmission system

Publications (1)

Publication Number Publication Date
GB297078A true GB297078A (en) 1929-06-19



Family Applications (1)

Application Number Title Priority Date Filing Date
GB8351/28A Expired GB297078A (en) 1927-09-14 1928-03-19 Improvements in or relating to television systems

Country Status (3)

Country Link
US (1) US2166247A (en)
FR (1) FR654754A (en)
GB (1) GB297078A (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2137010A (en) * 1934-06-09 1938-11-15 Rca Corp Television system
US2611027A (en) * 1948-07-10 1952-09-16 Jr John Hays Hammond Television still-picture transmitting and recording system
US2856829A (en) * 1955-12-07 1958-10-21 Orlando Carl Apparatus for making photographic reproductions for projection

Also Published As

Publication number Publication date
FR654754A (en) 1929-04-10
US2166247A (en) 1939-07-18

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