pistonphone

pistonphone

[′pis·tən‚fōn]
(engineering acoustics)
A small chamber equipped with a reciprocating piston having a measurable displacement and used to establish a known sound pressure in the chamber, as for testing microphones.
References in periodicals archive ?
With these frequencies determined, the process to obtain the value of the total amplitude found in this band (corresponding to 94db SPL on the pistonphone) was carried out by summing the amplitudes of the samples within this frequency range in the variable Pfft.
This constitutes a rather large error in the calibration performed with the pistonphone (which, it should be clarified, has also not been electronically calibrated in the same period of time) and in the subsequent results of formal measurements of the signal of interest.
* The calibration of the SLM (through the pistonphone) was performed only once, at the very beginning of setting up for project measurements.