SAMPLE RATE

T&F
The sampling rate, sample rate, or sampling frequency (fs) defines the number of samples per unit of time (usually seconds) taken from a continuous signal to make a discrete signal. For time-domain signals, the unit for sampling rate is hertz (inverse seconds, 1\/s, s−1), sometimes noted as Sa\/s (samples per second). The inverse of the sampling frequency is the sampling period or sampling interval, which is the time between samples
In digital audio the most common sampling rates are 44.1 kHz, 48 kHz, and 96 kHz.
In digital audio, 44,100 Hz is a common sampling frequency: analog audio is recorded by sampling it 44,100 times per second, and then these samples are used to reconstruct the audio signal when playing it back. "Hz" is an abbreviation for hertz, meaning "[cycles, samples] per second", and the alternative form 44.1 kHz (kilohertz, 1000 times per second) is also very commonly found.
44.1 kHz audio is widely used, due to this being the sampling rate used in Compact Discs, and its common use dates back to its use by Sony from 1979.
48,000 Hz: The standard audio sampling rate used by professional digital video equipment such as tape recorders, video servers, vision mixers and so on. This rate was chosen because it could deliver a 22 kHz frequency response and work with 29.97 frames per second NTSC video - as well as 25 frame\/s, 30 frame\/s and 24 frame\/s systems. With 29.97 frame\/s systems it is necessary to handle 1601.6 audio samples per frame delivering an integer number of audio samples only every fifth video frame. Also used for sound with consumer video formats like DV, digital TV, DVD, and films. The professional Serial Digital Interface (SDI) and High-definition Serial Digital Interface (HD-SDI) used to connect broadcast television equipment together uses this audio sampling frequency. Much professional audio gear uses (or is able to select) 48 kHz sampling, including mixers, EQs, compressors, reverb, crossovers and recording devices such as DAT.
96,000 Hz: DVD-Audio, some LPCM DVD tracks, BD-ROM (Blu-ray Disc) audio tracks, HD DVD (High-Definition DVD) audio tracks. Most pro audio gear uses (or is able to select) 96 kHz sampling, including mixers, EQs, compressors, reverb, crossovers and recording devices. This sampling frequency is twice the 48 kHz standard commonly used with audio on professional video equipment.

Audio and video glossary. 2014.

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