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8ve (octave) oscillator gives easy access to a variety of test tones for quick hearing testing, room acoustic testing and equipment testing. The frequency can be changed in octave steps and the output level can be varied in decibel steps.

Octave oscillator produces test waveforms (sine, pulse, square, sawtooth and triangular) at fundamental frequencies that are spaced in octaves covering the hearing range (125 Hz, 250 Hz, 500 Hz, 1 kHz, 2 kHz, 4 kHz, 6 kHz and 16 kHz). These frequencies (except 16 kHz) are used in hearing testing as well as for testing room acoustics and equipment testing. The 16 kHz is a special case; this frequency is used as a "teen scarer" or "mosquito" tone because it can typically only be heard by those under 25 years of age.

The signals are generated at CD quality using 16 bit PCM "wav" format harmonic synthesis (within the Nyquist rate) at a sampling frequency of 44.1 kHz. The signal plays until the user presses the "Stop" button.

The output level is controlled in using a calibrated decibel attenuator in selectable steps of either 1 dB, 3 dB, 6 dB or 10 dB; (1 dB is about the minimum step we can hear; -3 dB (+3 dB) is an intensity halving (doubling); -6 dB (+6 dB) is an acoustic pressure halving (doubling) and -10 dB (+10 dB) is an average halving (doubling) in perceived loudness).

Coming soon: User entry of any arbitrary frequency value. ...More

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