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  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



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Jecklin Disk

From Wikipedia, the free encyclopedia


A Jecklin Disk is a sound-absorbing disk placed between two microphones to create an acoustic "shadow" from one microphone to the other. The resulting two signals can possibly produce a pleasing stereo effect.

Always, a matching pair of omnidirectional microphones are used.

The technique was invented by Jorg Jecklin, the former chief sound engineer of Swiss Radio. He referred to the technique as an "Optimal Stereo Signal" (OSS). In the beginning Jecklin used omnidirectional microphones on either side of a 12" disc of about 3/4" thickness, which had a muffling layer of soft plastic foam on each side. The capsules of the microphones were above the surface of the disc just in the center, 16.5 cm apart from each other and each pointing 20 degrees outside.

Nobody of the users wantetd to notice, that the master found the 16.5 cm ear spacing between the microphone too narrow and wrong. Now he tells us in his own papers that the disk has to be 35 cm in diameter and the distance between the microphones have now to be 36 cm. Really no measures of the distance between the ears anymore. In loudspeaker stereophony there is no use of the ear spacing. See Jecklin's paper at:

  • The new Jecklin Disk

Jecklin's German from his script: "Zwei Kugelmikrofone sind mit einem gegenseitigen Abstand von 36 cm angeordnet und durch eine mit Schaumstoff belegte Scheibe von 35 cm Durchmesser akustisch getrennt." That means: Two omnidirectional microphones have a distance from one to another of 36 cm and a separation between them of a foam plated disk with a diameter of 35 cm.

External links

  • Josephson Microphones - This page has a picture of the old Jecklin Disk
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