Magnifying glass effect

from Wikipedia, the free encyclopedia

The magnifying glass effect is mostly undesirable in stereo sound recording in runtime stereophony if the AB microphone system is too close to the sound source during the recording . In addition to the desired transit time difference signals .DELTA.t, there are also large proportions of the level difference .DELTA.L . Sound components that are only slightly off the center line of the microphone system are fully localized from the direction of the stereo loudspeakers . The sound source is therefore unnaturally wide, as if magnified with a magnifying glass, shown on the stereo base , and leads to strong jumping of sound components. The sound sources collect outside in the loudspeakers and indirectly leave behind the so-called "hole in the middle". If you approach a newspaper with a magnifying glass, the letters also tend outwards towards the edge of the magnifying glass. That is why this process is called the “magnifying glass effect”.

This “spreading out” is also used as an extra effect in light music, for example as an AB overhead microphone arrangement on drums, in the piano or when recording percussion instruments in general.

Not to be confused is the effect that the sound sources are almost exclusively concentrated in the loudspeakers in the case of a stereo recording in runtime stereophony, in which the microphone base a of the microphone system is quite large (over a meter) and the recording area is therefore very small.

literature

  • Hubert Henle: The recording studio manual. 5th edition, GC Carstensen Verlag, Munich, 2001, ISBN 3-910098-19-3

Web links