In Signal Chain Basics #34, we covered some of today's commonly used digital audio interfaces, from chip-to-chip I 2 S™ (Inter IC Sound) to system-to-system interfaces such as S/PDIF and AES/EBU.

Audio metering is present in almost any equipment that plays or records audio – from cell phones displaying bar graphs of audio output levels, to home stereos with flashing LEDS, to live broadcasting.