Digital post-processing enabled low-frequency calibration of anechoic chambers.

Evidence

In 1983 the analog system was replaced by a custom hybrid analog/digital system controlled by a DEC PDP-11/03 computer that permitted storage and post-processing of data acquired with 1/20-octave resolution. Low-frequency calibration of the chamber was then possible. It was a breakthrough. — Toole, Floyd E, Sound reproduction- the acoustics and…, 164

Categorization

• DEFINE: Shows how 1/20-octave resolution digital acquisition made bass-region chamber correction feasible.