Overview

Coupled Space Acoustics (CSA) is an Inspired Acoustics proprietary technique of generating release samples for pipe organ sounds spatially matched to semi-dry and dry audio sources by using multi-position room impulse response measurements of real acoustic spaces that are multi-dimensionally post processed.

This technique is supported by Inspired Acoustics adjustable spatial recording approach that is presented as user-configurable samples in the Kispest and later virtual pipe organs.

Uses

CSA was first used to generate cathedral acoustics release sample layers for generating the impression of coupled acoustic spaces to be used in semi-dry and dry pipe organ sample sets, particularly in Palace of Arts Budapest (PAB) Pipe Organ Samples Medium and Extended Editions. The impression of playing at the the organ loft, with its own acoustics -- to which a usually larger space (e.g. a cathedral) responds -- is a coupled space which corresponds to the subjective impression of playing a pipe organ with a high direct-to-reverberant ratio (high clarity) and hearing the cathedral responding to it.

How Inspired Acoustics determines the microphone position(s)

Inspired Acoustics derives its unique microphone choices, physical array(s) and position(s) to record a given pipe organ as determined by results of the following criteria:

• detailed room acoustic measurements
• room acoustic calculations (based on a hybrid model of measurement and modeling approaches)
• subjective tests and opinions of the host personnel (e.g. organist at the church)