Nonlinear spatial analysis distributes measured impulse responses across loudspeaker arrangements

Evidence

When a monophonic signal is convolved with a monophonic response, the room response is perceived to be in the direction of the loudspeaker. In reproduction with multiple loudspeakers, localizing the reverberation to the directions reproducible with the loudspeaker set-up is often desired. The microphone techniques discussed in Section 14.4 can be used for impulse response recording, and their pros and cons also hold in impulse-response-based reverberation. Some dedicated non-linear techniques for impulse response reproduction for multi-channel playback have also been proposed (Farina and Ugolotti, 1999; Merimaa and Pulkki, 2005; Tervo et al., 2013), which overcome some flaws in the microphone techniques. In the nonlinear techniques, measured impulse responses are processed into impulse responses for each loudspeaker in multi-channel layouts using instantaneous spatial analysis from the measured response. — Ville Pulkki, Matti Karjalainen, Communication Acoustics- An…, 1959

Categorization

• DEFINE: Defines nonlinear impulse-response reproduction: instantaneous spatial analysis spreads the measured response to each channel.