The concept of sampling frequency can only be applied to samplers in which samples are taken periodically. Some samplers may sample at a non-periodic rate.
The common notation for sampling frequency is which stands for frequency (subscript) sampled.
The Nyquist–Shannon sampling theorem states that perfect reconstruction of a signal is possible when the sampling frequency is greater than twice the maximum frequency of the signal being sampled, or equivalently, that the Nyquist frequency (half the sample rate) exceeds the highest frequency of the signal being sampled. If lower sampling rates are used, the original signal's information may not be completely recoverable from the sampled signal.
In some cases, it is desirable to have a sampling frequency considerably more than twice the desired system bandwidth so that a digital filter can be used in exchange for a weaker analog anti-aliasing filter. This process is known as oversampling.
|8,000 Hz||telephone and encrypted walkie-talkie, wireless intercom and wireless microphone transmission; adequate for human speech but without sibilance; ess sounds like eff|
|11,025 Hz||one quarter the sampling rate of audio CDs; used for lower-quality PCM, MPEG audio and for audio analysis of subwoofer bandpasses|
|22,050 Hz||one half the sampling rate of audio CDs; used for lower-quality PCM and MPEG audio and for audio analysis of low frequency energy. Suitable for digitizing early 20th century audio formats such as 78s|
|32,000 Hz||miniDV digital video camcorder, video tapes with extra channels of audio (eg. DVCAM with 4 Channels of audio), DAT (LP mode), Germany's Digitales Satellitenradio , NICAM digital audio, used alongside analogue television sound in some countries. High-quality digital wireless microphones.|
|44,056 Hz||PCM adaptor using NTSC video tapes (245 lines by 3 samples by 59.94 frames per second), sometimes misused to play back audio streams sampled at 44,100 Hz (and vice versa)|
|44,100 Hz||audio CD, also most commonly used with MPEG-1 audio (VCD, SVCD, MP3), adopted from the PCM adaptor using PAL video tapes (588 lines by 3 samples by 25 frames per second). Much pro audio gear uses (or is able to select) 44.1 kHz sampling, including mixers, EQs, compressors, reverb, crossovers, recording devices and CD-quality encrypted wireless microphones.|
|47,250 Hz||world's first commercial PCM sound recorder by Nippon Columbia (Denon)|
|48,000 Hz||digital sound used for miniDV, digital TV, DVD, and films. Much pro audio gear uses (or is able to select) 48 kHz sampling, including mixers, EQs, compressors, reverb, crossovers and recording devices such as DAT.|
|50,000 Hz||first commercial digital audio recorders from the late 70s from 3M and Soundstream|
|50,400 Hz||sampling rate used by the Mitsubishi X-80 digital audio recorder|
|88,200 Hz||sampling rate used by professional recording equipment when the destination is CD (multiples of 44,100 Hz). Some pro audio gear uses (or is able to select) 88.2 kHz sampling, including mixers, EQs, compressors, reverb, crossovers and recording devices.|
|96,000 Hz||DVD-Audio, some LPCM DVD tracks, BD-ROM (Blu-ray Disc) audio tracks, and HD DVD (High-Definition DVD) audio tracks. Some pro audio gear uses (or is able to select) 96 kHz sampling, including mixers, EQs, compressors, reverb, crossovers and recording devices.|
|176,400 Hz||sampling rate used by professional recording equipment when the destination is CD (multiples of 44,100 Hz)|
|192,000 Hz||DVD-Audio, some LPCM DVD tracks, BD-ROM (Blu-ray Disc) audio tracks, and HD DVD (High-Definition DVD) audio tracks, High-Definition audio recording devices and audio editing software|
|2,822,400 Hz||SACD, 1-bit sigma-delta modulation process known as Direct Stream Digital, co-developed by Sony and Philips|
When analog video is converted to digital video, a different sampling process occurs, this time at the pixel frequency, corresponding to a spatial sampling rate along scan lines. Some common pixel sampling rates are:
Spatial sampling in the other direction is determined by the spacing of scan lines in the raster. The sampling rates and resolutions in both spatial directions can be measured in units of lines per picture height.
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