Audio frequency sampling rate

About Audio frequency sampling rate

Audio frequency sampling rate, measured in Hertz (Hz - cycles per second) and Kilohertz (kHz - thousand cycles per second), partially determines the overall sound quality. And we have to choose a proper audio frequecy sampling rate which conforms to the supported sampling rate by different digital players.

CD quality audio has a sample rate of 44100Hz, 16-bit (resolution) and stereo (channels). The most common sample rates are 11, 22 and 44kHz, with most recording software supporting sample rates from 6kHz up to 192kHz.The quality of an audio recording decreases as the sample rate is lowered. For audio recordings destined to be encoded to MP3, 22kHz is considered acceptable.

oversampling and undersampling

Oversampling is the process of sampling a signal with a sampling frequency significantly higher than twice the bandwidth or highest frequency of the signal being sampled while undersampling or bandpass sampling is a technique where one samples a bandpass filtered signal at a sample rate below the usual Nyquist rate (half the baseband bandwidth, i.e. half the upper cut-off frequency), but is still able to reconstruct the signal.

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