Signal-to-quantization-noise ratio

Signal-to-quantization-noise ratio (SQNR or SNqR) is widely used quality measure in analysing digitizing schemes such as pulse-code modulation (PCM). The SQNR reflects the relationship between the maximum nominal signal strength and the quantization error (also known as quantization noise) introduced in the analog-to-digital conversion.

Source: Wikipedia — Signal-to-quantization-noise ratio (CC BY-SA 4.0)