hertz - Measure of cycles per second, e.g, 50 cycles per second, analogue - Continuous signal/wave (opposite of digital), ADC - abbreviation for Analogue to Digital, lossy - compression which removes sound or image quality, pixel - smallest identifiable area of an image, colour depth - number of bits to represent a colour, metadata - additional information about an image (resolution, colour depth, location), microphone - device to capture analogue sound, speaker - device to output analogue sound, DAC - device to convert a digital signal to analogue,

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