IR

1. Infrared (light). Frequency range approximately 10^12 to 10^14 Hz. IR light is used as a control signal in remote control units. 2. Impulse Response. The impulse response of a room contains the acoustic information of that room in the position where measured. Impulse response of rooms also applies to convolutional reverbs which generates reverb of actual rooms. Further, the impulse response of the microphones is measured. This is a tool used in microphone development, however, seldom published as the results from different brands are hardly comparable.