In fact, HD audio has been around as far back as 1995 but couldn’t find a foothold in the market at the time. These files are not as new as you may think. This moves it further from our hearing range resulting in cleaner sounding audio. Anything above that will introduce fake samples which is where the low-pass filter kicks in to process them out.īy increasing the sampling rate you move the low-pass filter higher into the frequency range. For example, if the sampling rate is 44.1kHz anything below half that will be accurately rendered. This filter processes out frequencies that are not within the sampling limit. There are instances where a higher sampling rate does help to improve the listening experience.Īnalog to digital converters have an in-built low pass filter. The question often comes up if this is needed. Hi-resolution audio can be recorded at double the standard CD rate or even as high as 192kHz. This hasn’t stopped people from recording at a higher sampling rate. Nothing that you would realistically hear. By doubling that you can assume that nothing relevant is lost when recording/reproducing the original sound. The human hearing range tops out at about 20kHz. This theorem determined that if you double the maximum frequency of the source you can accurately capture the sample. This all stems from the groundwork laid out in the Nyquist–Shannon theorem. For example, CDs have a sampling rate of 44.1kHz. The sampling rate is the number of samples taken in a second. Bitrate is determined by the sampling rate and the bit depth.
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