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ARTICLES IN THE BOOK

  1. Acoustics
  2. AKG Acoustics
  3. Audio feedback
  4. Audio level compression
  5. Audio quality measurement
  6. Audio-Technica
  7. Balanced audio connector
  8. Beyerdynamic
  9. Blumlein Pair
  10. Capacitor
  11. Carbon microphone
  12. Clipping
  13. Contact microphone
  14. Crosstalk measurement
  15. DB
  16. Decibel
  17. Directional microphone
  18. Dynamic range
  19. Earthworks
  20. Electret microphone
  21. Electrical impedance
  22. Electro-Voice
  23. Equal-loudness contour
  24. Frequency response
  25. Georg Neumann
  26. Harmonic distortion
  27. Headroom
  28. ITU-R 468 noise weighting
  29. Jecklin Disk
  30. Laser microphone
  31. Lavalier microphone
  32. Loudspeaker
  33. M-Audio
  34. Microphone
  35. Microphone array
  36. Microphone practice
  37. Microphone stand
  38. Microphonics
  39. Nevaton
  40. Noise
  41. Noise health effects
  42. Nominal impedance
  43. NOS stereo technique
  44. ORTF stereo technique
  45. Parabolic microphone
  46. Peak signal-to-noise ratio
  47. Phantom power
  48. Pop filter
  49. Positive feedback
  50. Rode
  51. Ribbon microphone
  52. Schoeps
  53. Sennheiser
  54. Shock mount
  55. Shure
  56. Shure SM58
  57. Signal-to-noise ratio
  58. Soundfield microphone
  59. Sound level meter
  60. Sound pressure
  61. Sound pressure level
  62. Total harmonic distortion
  63. U 47
  64. Wireless microphone
  65. XLR connector

 

 



MICROPHONES
This article is from:
http://en.wikipedia.org/wiki/NOS_stereo_technique

All text is available under the terms of the GNU Free Documentation License: http://en.wikipedia.org/wiki/Wikipedia:Text_of_the_GNU_Free_Documentation_License 

NOS stereo technique

From Wikipedia, the free encyclopedia

 

The NOS stereo microphone system is a very useful device to capture a stereo sound.

The Nederlandse Omroep Stichting NOS = Holland Radio found by a number of practical attempts a stereo main microphone system, which results in a quite even distribution of the phantom sources (hearing event direction) on the stereo loudspeaker base, with two small cardiod characteristic microphones, and a recording angle of the microphone system of ▒ 40.5░ = 81░. This system got empirical an axle angle of α = ▒ 45░ = 90░ and a microphone distance (microphone basis) of a = 30 cm.

Here are frequency-independent level differences effective and time of arrival differences working together in the same direction as interchannel signals (interchannel loudspeaker signals). This technique leads to a realistic stereo effect and has a reasonable mono-compatibility. These interchannel signals have nothing to do with interaural signals which come only from artificial head recordings. Even the spacing of a = 30 cm has nothing to do with human ear distance, because a useful microphone system for a set of stereo loudspeakers should be developed and not for ear phones. This recording technology is called mixed stereo or equivalence stereo. Usually this special microphone system must be built up from two single small diaphragm microphones. One should not use double diaphragm microphones because of the produced unbalanced directional characteristics and the larger phase responses. It appears advisable to experiment with the two parameters the axle angle α and the microphone basis a to which there are practical microphone mounting devices.

A similar technique is known as ORTF stereo technique (ORTF microphone system). ORTF = Office de Radiodiffusion TÚlÚvision Franšaise = Radio France . The angle between the microphone axes is α = ▒ 55░ = 110░ and the distance between the microphones (microphone basis) is in this case a = 17 cm and gives a total recording angle of 96░. The choice between one and the other depends on the recording angle of the microphone system and not on the distance to and the width of the sound source, the orchestra angle.

See also

  • Microphone
  • ORTF stereo technique
  • Stereophony
Retrieved from "http://en.wikipedia.org/wiki/NOS_stereo_technique"