Coincident and spaced microphone pairs encode direction into IAD or ITD cues.

Evidence

The acoustical version of amplitude panning employs coincident directional microphone pairs (e.g. Blumlein pairs) to generate interchannel amplitude differences, IAD, for musicians located at different angles in front of the microphones. Spaced omnidirectional microphones generate interchannel time differences, ITD, for musicians located at different angles. Most recordings are made using spaced microphones that are also directional, so they generate simultaneous IAD and ITD. — Toole, Floyd E, Sound reproduction- the acoustics and…, 411

Categorization

• DEFINE: Defines how stereo microphone techniques map to interchannel amplitude (IAD) and time (ITD) difference cues.