GB547082A - Improvements in sound receiving apparatus - Google Patents

Improvements in sound receiving apparatus

Info

Publication number
GB547082A
GB547082A GB482441A GB482441A GB547082A GB 547082 A GB547082 A GB 547082A GB 482441 A GB482441 A GB 482441A GB 482441 A GB482441 A GB 482441A GB 547082 A GB547082 A GB 547082A
Authority
GB
United Kingdom
Prior art keywords
magnet
noise
aeroplane
records
tape
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
GB482441A
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 GB482441A priority Critical patent/GB547082A/en
Publication of GB547082A publication Critical patent/GB547082A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00—Circuits for transducers, loudspeakers or microphones
    • H04R3/005—Circuits for transducers, loudspeakers or microphones for combining the signals of two or more microphones

Landscapes

  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Electrically Operated Instructional Devices (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)

Abstract

547,082. Eliminating noise. CAIN, G. T. April 11, 1941, No. 4824. [Class 40 (iv)] In an arrangement for enabling a desired sound to be heard in the presence of disturbing noise, as for example on an aeroplane, the sound mixture received by a microphone a is recorded by a magnet e on an iron tape i and a second magnet h records in opposite phase the noise alone, which is derived by reproduction from a previously made steel tape record c. A pick-up magnet k feeds headphones l or an amplifier and loudspeaker with the desired sound. The magnet h is adjustable in position and a rheostat g is included for varying the current thereto in order to balance out the noise accurately. Induction between the magnets e, h, k is prevented by screens f, j. Separate tape records c may be provided for use when the aeroplane is travelling at different speeds.
GB482441A 1941-04-11 1941-04-11 Improvements in sound receiving apparatus Expired GB547082A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB482441A GB547082A (en) 1941-04-11 1941-04-11 Improvements in sound receiving apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB482441A GB547082A (en) 1941-04-11 1941-04-11 Improvements in sound receiving apparatus

Publications (1)

Publication Number Publication Date
GB547082A true GB547082A (en) 1942-08-12

Family

ID=9784483

Family Applications (1)

Application Number Title Priority Date Filing Date
GB482441A Expired GB547082A (en) 1941-04-11 1941-04-11 Improvements in sound receiving apparatus

Country Status (1)

Country Link
GB (1) GB547082A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2587593A (en) * 1946-08-31 1952-03-04 Armour Res Found Apparatus for supplying mechanical recording bias to magnetic recorders
US2649506A (en) * 1948-01-16 1953-08-18 Int Standard Electric Corp Negative feedback applied to magnetic recording
GB2126837A (en) * 1982-08-19 1984-03-28 British Aerospace Noise suppression

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2587593A (en) * 1946-08-31 1952-03-04 Armour Res Found Apparatus for supplying mechanical recording bias to magnetic recorders
US2649506A (en) * 1948-01-16 1953-08-18 Int Standard Electric Corp Negative feedback applied to magnetic recording
GB2126837A (en) * 1982-08-19 1984-03-28 British Aerospace Noise suppression

Similar Documents

Publication Publication Date Title
GB547082A (en) Improvements in sound receiving apparatus
GB401564A (en) Method for the arbitrary distortion and correction of wireless or wire transmitted alternating currents, such as speech and signal alternating currents, by means of superimposed disturbance alternating currents
GB341531A (en) Loud speakers
GB758549A (en) A method for measuring magnetic field intensities
GB845904A (en) A device for the production or playing back of a two-signal grooved sound track
GB325699A (en) Improvements in and relating to the reproduction of sound by electro-magnetic means
GB636993A (en) Improvements in or relating to sound recording and reproducing apparatus
GB762928A (en) Magnetic sound transduction
SU112613A1 (en) Method of recording stereo soundtracks from one input
FR1113629A (en) Improvements to sound recording and reproducing apparatus by magnetic tapes
GB716193A (en) Magnetic sound recording apparatus
GB435980A (en) Improvements in or relating to the stereophonic reproduction of sound
GB547574A (en) Improvements in or relating to sound rerecording systems
GB636017A (en) Negative feedback applied to magnetic recording
GB396165A (en) Improvements in or relating to loud speakers
GB856829A (en) Improvements in gramophone pick-ups
GB626157A (en) Improvements in or relating to sterophonic sound-recording
GB793521A (en) Tape feeding apparatus for magnetic sound recording and/or reproducing mechanisms
GB784147A (en) Improvements in or relating to moving coil type sound reproducing devices
GB255149A (en) Improvements in or relating to loud speaking reproducer
JPS55153496A (en) Corrector of sound field of speaker
GB233563A (en) Telephone attachments for phonographs and the like
GB407217A (en) An improved loud speaker
GB328721A (en) Improvements in the recording of sound waves on discs, cylinders, or like rotating members
GB737239A (en) Improvements in or relating to electromagnetic transducers