high-resolution audio

High-resolution audio (High-definition audio or HD audio) is a technical and marketing term for audio with greater than 44.1 kHz sample rate or higher than 16-bit audio bit depth. It commonly refers to 96 kHz or 192 kHz sample rates, producing a Nyquist frequency of 48 kHz or more. However, there also exist 44.1 kHz/24-bit, 48 kHz/24-bit and 88.2 kHz/24-bit recordings that are labeled HD Audio. Research into high resolution audio began in the late 1980s and high resolution audio content started to become available on the consumer market in 1996.