A multi-channel digital audio laboratory facility

A computer controlled laboratory for audio research is described. The foundation of the system is a control module operating asynchronously to the computer and a Tri-State bus line to which laboratory modules may be connected. The bus line contains 16 bi-directional data lines and addressing and control lines. The system is flexible enough to allow rapid computer checkout of prototype devices which inevitably evolve in the context of research. The system may also operate as a multi-channel digital record and playback system. The presently utilized 12-bit, 10kHz A/D and D/A modules are described and system noise problems are discussed.