Deutsche Welle: Radio Training Centre

Stereo recording techniques

Stereo Recording Techniques (570 KB)
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3. Level suppression due to delay time difference
If two microphones have different distances from a sound source, one will find a level increase or decrease if both microphone signals are summed up for certain distance differences and frequencies:

Fig. 6

Summation of two microphone signals for different distance-differences and constant frequency:

d	0	8,5	17	25,5	34	42,5	51	cm
u	200	40	160	80	130	90	108	%

Fig. 7

Level suppression:	At distance differences /2 and the odd multiples
Level increase:	At distance differences 0, and the multiples of

Stereo Recording Techniques (570 KB)
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Stereo recording techniques