![]() ![]() An aluminum perforated plate was additionally installed in front of the diaphragm, and the same signal as that applied to the sound source was applied to the perforated plate. ![]() The SWPM consists of two parallel metal plates, where the front plate was operated as a diaphragm. We developed a sound wave phase meter (SWPM) and measured the amplitude and wavelength of sound waves in free space. Background noise levels should be reported besides the sound levels of voice and speech.Īmplitude and Wavelength Measurement of Sound Waves in Free Space using a Sound Wave Phase Meter Head-mounted microphones placed at the proximity of the mouth improve signal-to-noise ratio and can be taken advantage of for voice SPL measurements when calibrated. Classified sound level meters should be used to assure measurement accuracy. Sound level measurement settings (i.e., frequency weighting and time weighting/averaging) should always be specified. SPL of voice and speech should be reported together with the mouth-to-microphone distance so that the levels can be related to vocal power. Several calibration procedures for SPL measurements are described for stand-mounted and head-mounted microphones. Variation of SPL with distance, sound level meters and their accuracy, frequency and time weightings, and background noise topics are reviewed. Basic information is put together from standards, technical, voice and speech literature, and practical experience of the authors and is explained for nontechnical readers. This article aims at explaining the fundamental principles behind these measurements and providing guidelines to improve their accuracy and reproducibility. Sound pressure level (SPL) measurement of voice and speech is often considered a trivial matter, but the measured levels are often reported incorrectly or incompletely, making them difficult to compare among various studies. Tutorial and Guidelines on Measurement of Sound Pressure Level in Voice and Speech. Measurements may be made up to the threshold of feeling with an accuracy of plus or minus 2 db band analysis of complex spectra may be made if desired. The source of power is five flashlight batteries. The instrument employs a carbon microphone but has no amplification. has developed a simple pressure- level meter for the measurement of sound-pressure levels above 70 db. A Sound Pressure- level Meter Without Amplification
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