Constructive and Destructive InterferenceSound waves of equal amplitude, offset at half wavelengths, result in compression waves with an amplitude of 0—canceling out the sound. The two waves are then said to be “out of phase” and subtracted from one another as the positive pressures of one ...
Loudness is not related to wavelength. Nails on a chalkboard may seem louder than a person humming at the same volume, but they are not — the loudness is caused purely by the strength of the soundwave, otherwise known as its amplitude. Imagine this scenario: ...
and amplitude differences over the short analysis windows used by the encoders may only be slight — so the analysis system doesn't get an entire cycle of a low frequency per analysis window. In some situations, the encoder will be presented...
When discussing compression in the context of audio, disambiguation is needed, since it can refer to different things. Firstly, it can refer to dynamic range compression, where an audio signal’s amplitude characteristics are modified by signal processing—that can happen in either the analog or d...
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These ranges were selected to correspond to equal levels of perceived loudness on the Equal-Loudness Level Contours as defined in the International standard ISO 226:2003. Because the selected frequency ranges were fixed throughout the experiment, the stimulus (signal and noise) was defined by an ...
Secondly, shimmer local (i.e., SL) was the absolute mean difference between the amplitudes of successive periods divided by the average amplitude. Thirdly, the shimmer local dB (i.e., SLdB) was obtained as the base-10-logarithm of the differences between the amplitudes of successive periods ...