GB483395A - Improvements in and relating to the recording and reproduction of sound - Google Patents

Improvements in and relating to the recording and reproduction of sound

Info

Publication number
GB483395A
GB483395A GB3194636A GB3194636A GB483395A GB 483395 A GB483395 A GB 483395A GB 3194636 A GB3194636 A GB 3194636A GB 3194636 A GB3194636 A GB 3194636A GB 483395 A GB483395 A GB 483395A
Authority
GB
United Kingdom
Prior art keywords
amplifier
control
sound
recording
reproduction
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
GB3194636A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB3194636A priority Critical patent/GB483395A/en
Publication of GB483395A publication Critical patent/GB483395A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B31/00—Associated working of cameras or projectors with sound-recording or sound-reproducing means

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Signal Processing Not Specific To The Method Of Recording And Reproducing (AREA)

Abstract

483,395. Optical sound recording and reproducing apparatus. KOLB, O. K., and PRATT, A. S. Nov. 21, 1936, No. 31946. [Class 40 (ii)] In recording sound with amplitude control, an additional record track is made of an independent super-audible or sub-audible frequency the amplitude of which is subjected to the same control as the recorded sound, and this additional track to control volume in reproduction. In one recording arrangement, the output of an amplifier connected to a microphone and the output of an oscillator are mixed and controlled by a single volume control and fed to a recording amplifier, which makes a combined record. Reproduction from such a record is by means of a single photo - cell 8, connected to two transformers 9, 10. The transformer 9 transmits sound current to an amplifier K ; and the other transformer 10 has a secondary tuned to the oscillator frequency and feeds that frequency to an amplifier L containing a rectifier 11, the output of which serves to control the amplification of the amplifier K. In a modified reproducing arrangement separate filters are provided between a transformer in the photo-cell circuit and the two amplifiers K, L. In another recording arrangement, the current from the microphone amplifier and the current from the oscillator are not mixed but subjected to the same amount of amplitude control before being recorded in separate tracks. Reproduction from a record with two such tracks, is by means of two photo-cells connected to two separate amplifiers, the amplifier of the control frequency having a rectifier, the output of which controls the amplification of the sound amplifier.
GB3194636A 1936-11-21 1936-11-21 Improvements in and relating to the recording and reproduction of sound Expired GB483395A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3194636A GB483395A (en) 1936-11-21 1936-11-21 Improvements in and relating to the recording and reproduction of sound

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3194636A GB483395A (en) 1936-11-21 1936-11-21 Improvements in and relating to the recording and reproduction of sound

Publications (1)

Publication Number Publication Date
GB483395A true GB483395A (en) 1938-04-20

Family

ID=10330732

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3194636A Expired GB483395A (en) 1936-11-21 1936-11-21 Improvements in and relating to the recording and reproduction of sound

Country Status (1)

Country Link
GB (1) GB483395A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2714202A (en) * 1948-10-19 1955-07-26 Cook Electric Co Recording system utilizing a single control signal capable of controlling two characteristics of the signal

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2714202A (en) * 1948-10-19 1955-07-26 Cook Electric Co Recording system utilizing a single control signal capable of controlling two characteristics of the signal

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