GB508249A - Improvements in and relating to the reproduction of recorded sound - Google Patents

Improvements in and relating to the reproduction of recorded sound

Info

Publication number
GB508249A
GB508249A GB1161538A GB1161538A GB508249A GB 508249 A GB508249 A GB 508249A GB 1161538 A GB1161538 A GB 1161538A GB 1161538 A GB1161538 A GB 1161538A GB 508249 A GB508249 A GB 508249A
Authority
GB
United Kingdom
Prior art keywords
photo
battery
electric
circuit
anode
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
GB1161538A
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.)
RCA PHOTOPHONE Ltd
Original Assignee
RCA PHOTOPHONE 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 RCA PHOTOPHONE Ltd filed Critical RCA PHOTOPHONE Ltd
Priority to GB1161538A priority Critical patent/GB508249A/en
Publication of GB508249A publication Critical patent/GB508249A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording 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

Landscapes

  • Bidet-Like Cleaning Device And Other Flush Toilet Accessories (AREA)

Abstract

508,249. Optical sound - reproducing apparatus. RCA PHOTOPHONE, Ltd., and UNDERHILL, J. April 14, 1938, No. 11615. [Class 40 (ii)] A circuit arrangement for reproducing from push-pull sound records comprising two-photoelectric elements A, B connected with the input circuit of an amplifier by means of a resistancecapacity network so arranged that the output of one photo-electric element is in reverse phase with that of the other, is characterized. in that the two photo-electric elements are either both connected with a single source of direct current or each is connected with a separate source, a resistance 13 being connected in the anode circuit of one photo-electric element A and another resistance 19 in the cathode circuit of the other photo-electric element B, the said anode and cathode being connected in parallel through condensers 20, 21 with one input terminal 23 of the amplifier. In a modification of the arrangement shown in Fig. 1, the battery 11 is replaced by a resistance network connected across any suitable voltage source. Fig. 2 shows a further modification in which the anode and cathode respectively of the cells B, A are connected together and to an adjustable tapping 25 on a potentiometer connected across the terminals of the battery 11. Condensers 27, 28, providing a low resistance path for alternating current, are connected between the tapping point 25 and the terminals of the battery. The potentiometer 26 may be omitted, and the tapping point 25 adjustably connected to the battery near the centre. Instead of providing separate photo-electric cells as shown, a double cell comprising two photo-electric elements in one envelope may be used.
GB1161538A 1938-04-14 1938-04-14 Improvements in and relating to the reproduction of recorded sound Expired GB508249A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1161538A GB508249A (en) 1938-04-14 1938-04-14 Improvements in and relating to the reproduction of recorded sound

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1161538A GB508249A (en) 1938-04-14 1938-04-14 Improvements in and relating to the reproduction of recorded sound

Publications (1)

Publication Number Publication Date
GB508249A true GB508249A (en) 1939-06-28

Family

ID=9989502

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1161538A Expired GB508249A (en) 1938-04-14 1938-04-14 Improvements in and relating to the reproduction of recorded sound

Country Status (1)

Country Link
GB (1) GB508249A (en)

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