Putnam, CT (April 2, 2009)–Rational Acoustics has launched its first acoustic test and measurement accessory product to be designed and distributed under the Rational Acoustics brand name: The Noise Stick.
Designed to be plugged into a phantom-powered microphone input, it generates pink noise. Hand-built in the U.S. exclusively for Rational Acoustics by PMP Audio Works, it reportedly features hand-matched transistors, 1 percent tolerance resistors and a Linear Feedback Shift Register (LFSR) random-number generator that provides a pseudorandom signal with statistical properties and without any audible repeats.
The output of the Noise Stick’s random-number generator drives a hand-tuned filter bank that delivers a pink spectrum that is nominally flat within +/- 0.5 dB from 20 Hz to 20 kHz on a fractional-octave analyzer. According to the company, frequency response and output level for each unit is tested at both the beginning and end of the burn-in process to ensure that both criteria perform over time without variation.
The compact design fits into mic cases and gear bags. The housing for the Noise Stick is milled from a solid piece of aluminum rod to yield a thicker than normal walled tube. The entire unit is filled with epoxy after assembly to protect the electronics from shock and increase its crush strength.
Prototype test units were found to work after being dropped from two stories onto a concrete surface and run over by a car.