Excellent for teaching and increasing understanding of sound generation, human hearing range, hearing loss effects, and turns your device into a cheap test oscillator!

Octave Oscillator Lite produces test signals (sine, square, pulse, triangular, sawtooth and white noise) at a selection of octave spaced fundamental frequencies (except the noise!).

The fundamental frequency can be selected at the octave values (going up or down by one octave doubles or halves the frequency respectively) that are typically used for acoustic testing of rooms, equipment testing and clinical hearing tests: 250 Hz, 500 Hz, 1 kHz, 2 kHz, 4 kHz and 8 kHz.

The output level can be varied with a decibel (dB) calibrated volume control in 6 dB steps; a -6 dB (+6 dB) step is a halving (doubling) in sound pressure.

Octave Oscillator with Noise Lite differs from the full version in that: (1) fundamental frequency cannot be arbitrarily selected via a text box; it can only be selected in octaves between 250 Hz and 8 kHz (the full version has 125 Hz to 16 kHz), and (2) it only has one decibel control in 6 dB steps (the full version also has 1, 2, and 10 dB steps available).

Hearing awareness: Please be aware that listening to loud sounds can damage your hearing and use HarmSyn with care and due consideration for your own ears as well as the ears of others. Please also bear in mind that if you cannot hear a sound it does not mean that others around you cannot hear it (everyone will lose high frequency hearing with age - an effect known as presbycusus) - this is especially true of the 16 kHz output which can be very irritating to those who can hear it (this is why it is used as a "teen scarer").

 More details about human hearing can be found in: Howard and Angus, Acoustics and psychoacoustics, 4th Edition, Oxford: Focal Press, 2009, ISBN: 978-0-240-52175-6.

HarmSynLite is available NOW - click on the link below

iPhone, iTouch and App Store are trademarks of Apple Inc.
davidmhoward.com is not affiliated with Apple Inc.