2. Sound Pressure - Loudness and Level

In this video, we'll look at pressure from the lens of loudness. We start with pressure, since we our ears are receptive to changes in air pressure, and is quite easy to measure. We'll look at the SI unit of pressure, Pascal, and the vast range of sound values that it can represent, all the way from the quietest (threshold of hearing) to the loudest (threshold of pain) sound that a human ear is capable of hearing. We'll also discuss pressure values of sounds higher than that, when sound morphs into shock waves at the fringe of the atmospheric pressure. But more importantly, the video sets up the discussion to talk about how to represent such a vast range of values. When a linear scale fails to give us appropriate resolution, we turn towards a logarithmic scale.

Find the full playlist here:    • Loudness and Level  

In this module on Loudness and Level we'll delve into how our sense of loudness is different for different frequencies and all the nuances associated with hearing. We'll look at level, and the technical ways of measuring and calculating the amplitude of signals. And finally we’ll look at a new way of measuring loudness that’s all the rage at the moment, the Loudness unit. It has redefined the standard used in streaming and broadcast, and promises to bring an end to the age of super compressed audio and the so-called loudness war.

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