GB389101A - Improvements in and relating to the recording of sound - Google Patents

Improvements in and relating to the recording of sound

Info

Publication number
GB389101A
GB389101A GB1624731A GB1624731A GB389101A GB 389101 A GB389101 A GB 389101A GB 1624731 A GB1624731 A GB 1624731A GB 1624731 A GB1624731 A GB 1624731A GB 389101 A GB389101 A GB 389101A
Authority
GB
United Kingdom
Prior art keywords
cathode
fluorescent screen
grid
anode
spot
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
GB1624731A
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.)
FREDERICK EDWARD LUTKIN
JAMES FLEMING HERD
Original Assignee
FREDERICK EDWARD LUTKIN
JAMES FLEMING HERD
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 FREDERICK EDWARD LUTKIN, JAMES FLEMING HERD filed Critical FREDERICK EDWARD LUTKIN
Priority to GB1624731A priority Critical patent/GB389101A/en
Publication of GB389101A publication Critical patent/GB389101A/en
Application status is Expired legal-status Critical

Links

Classifications

    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor

Abstract

389,101. Cathode-ray tubes; photoelectric cells. HERD, J. F. and LUTKIN, F. E., Radio Research Station, Slough, Buckinghamshire. June 4, 1931, No. 16247. [Class 39 (i).] Sounds are recorded optically by means of a cathode-ray oscillograph in which the beam of electrons is influenced by voltages of supersonic frequency to form on the fluorescent screen a line whose position or intensity is then varied in accordance with the sounds to be recorded. An electron beam from a cathode 1, as shown in the Figure, of a cathode-ray oscillograph is projected through an aperture in an anode 2 and is focused to produce a spot of light upon a fluorescent screen 3. After leaving the anode 2, the beam may be deflected electrostatically by electrodes 4, or by means of current-carrying coils outside or inside the tube, or by a combination of such means. The electron beam is accelerated by a further anode 2A to produce a more intense response on the fluorescent screen. The beam of electrons, where incident upon the fluorescent screen, is drawn out into a line by means of a supersonic frequency voltage and the width of the line is then varied by modulation of the supersonic voltage by the audio-frequency voltage derived from the microphone. Alternatively, the electron beam may be vibrated by a voltage of supersonic frequency to produce a luminous line which is then vibrated along its own length by applying to the oscillograph the voltages from the microphone. For recording a variable density record, the audio-frequency voltages may be applied to produce variations of intensity of the luminous line on the fluorescent screen. Specification 235,254, [Class 37, Electricity, Measuring &c.], is referred to. The Provisional Specification describes also the recording of sound by a cathode-ray oscillograph wherein a vibrating spot of light is produced on the fluorescent screen and is photographed as a sinuous,trace on the record film. Such a record may be reproduced by a photo-electric cell in which the emissive cathode is formed as a narrow strip and the anode is plate-shaped and positioned so that the current variations between it and the cathode are proportional to the amplitude of movement of the reproducing spot of light. The law of variation of the current may be arranged, by so shaping and positioning the cathode, that correction is made for distortion in the recording and reproducing systems. According to a modification, the anode may be in the form of a plate or plates with an interposed grid between it and the cathode, which grid serves to vary the law of conductance according to the position of the spot of light on the cathode. The grid may be a current-carrying wire, or an equipotential grid, the mesh of which is varied along its length, or the distance from the grid to the cathode may be varied along its length.
GB1624731A 1931-06-04 1931-06-04 Improvements in and relating to the recording of sound Expired GB389101A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1624731A GB389101A (en) 1931-06-04 1931-06-04 Improvements in and relating to the recording of sound

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1624731A GB389101A (en) 1931-06-04 1931-06-04 Improvements in and relating to the recording of sound

Publications (1)

Publication Number Publication Date
GB389101A true GB389101A (en) 1933-03-06

Family

ID=10073853

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1624731A Expired GB389101A (en) 1931-06-04 1931-06-04 Improvements in and relating to the recording of sound

Country Status (1)

Country Link
GB (1) GB389101A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2477640A (en) * 1944-06-27 1949-08-02 Homer R Montague Sound recording method and apparatus
US2478681A (en) * 1945-07-18 1949-08-09 Rca Corp Cathode-ray type sound recording system
US2510121A (en) * 1945-04-17 1950-06-06 Standard Telephones Cables Ltd Pulse modulation sound recording system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2477640A (en) * 1944-06-27 1949-08-02 Homer R Montague Sound recording method and apparatus
US2510121A (en) * 1945-04-17 1950-06-06 Standard Telephones Cables Ltd Pulse modulation sound recording system
US2478681A (en) * 1945-07-18 1949-08-09 Rca Corp Cathode-ray type sound recording system

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