Recording area

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In stereo recording technology, the recording area of ​​the microphone system is the recording cone in which the sound sources are located and which is mapped onto the generated stereo base of the stereo loudspeakers during playback .

With stereo playback, the recording area becomes the maximum stereo stage (so-called imaging area ) between the speakers. - To illustrate, the detection cone of the microphones can be analogized with the variably adjustable headlight cones of a theater stage, whereby the microphones (with their specific directional characteristics ) act as 'auditory headlights'.

The axis angle (phase rotation in angular degrees ) between the microphones and the respective directional characteristic changes the level difference Δ L depending on the angle of sound incidence and the microphone base (distance between the microphone membranes) changes the transit time difference Δ t depending on the angle of sound incidence.

The recording area perceived during playback 'shrinks' both when the distance between the microphone diaphragms increases and the delay time difference increases , and when their axis angle increases, phase rotation , and vice versa (increasing the distance and axis angle leads to a subjective 'reduction' of the recording area).

The pick-up area of ​​a microphone system can be calculated or looked up.


To calculate the direction of the auditory event for equivalence stereophony , the recording area can be determined with the Excel program.

In this context, reference is often made to the Williams curves , which rely on slightly different psychoacoustic calculated values ​​for the transit time difference Δ t and the level difference Δ L , which were found with Maracas clicks and speech signals in the anechoic room.

See also


  • Michael Dickreiter, Volker Dittel, Wolfgang Hoeg, Martin Wöhr (eds.): Handbuch der Tonstudiotechnik , 8th, revised and expanded edition, 2 volumes, publisher: Walter de Gruyter, Berlin / Boston, 2014, ISBN 978-3-11- 028978-7 or e- ISBN 978-3-11-031650-6
  • Thomas Görne: Sound engineering. Fachbuchverlag Leipzig in Carl Hanser Verlag, Munich et al. 2006, ISBN 3-446-40198-9 .
  • Thomas Görne: Microphones in theory and practice. 8th edition, Elektor-Verlag, Aachen 2007, ISBN 978-3-89576-189-8

Web links

Individual evidence

  1. The recording area, important calculated values (PDF; 34 kB)
  2. Recording area curves (kidneys) , (PDF; 290 kB)
  3. Recording area important values , (PDF; 67 kB)
  4. Direction of hearing events - equivalent microphones, ( MS Excel ; 26 kB)