This demonstration estimates the level of a tone. The level of a modulating tone is adjusted until beats are just heard between the harmonic tone and the modulating tone.

During the first interval a tone of frequency F1, level L1, and phase P1 is played.
During the second interval a tone of frequency F2, level L2, and phase P2 is added.
During the third interval a tone of frequency F3, level L3, and phase P3 is added.

Instructions

Set paramters, then click Begin.


Parameters
F1       F2       FM       Frequency - Hz
L1       L2       LM       Level - db SPL
P1       P2       PM       Phase - degrees
Duration    1:     2:     3:    ms.
Hz - Sample Rate      dB SPL - Calibration