For example, at a 40kHz sample rate (capable of capturing up to 20kHz), a signal with a frequency of 21kHz would be processed and perceived as 19kHz. This also means that any frequencies above half our sample rate will be captured as reflected frequencies. However, on the occasions that you are then there is one very good reason for sticking with 48kHz.Īs we previously mentioned, our sample rate is double the frequency range we wish to capture. With the nature of capturing audio for video, it is unlikely that you will be getting very close in on high-frequency sound sources. In most cases, there is no audible difference. When it comes to digital video formats, the most common sampling rate is 48kHz and as a rule, sticking to this should always give you high-quality results. Sticking to our theorem, this would mean a sampling rate of 40kHz. As an example, in order to capture dialogue which has a typical top end of around 12kHz, we would need a sampling rate of at least 24kHz.Īs you may be aware, the ability of the human ear peters out around 20kHz (much lower than this for most). Developed by Harry Nyquist, this theorem tells us that we need to record at twice the sampling rate of the highest frequency we wish to record.
This is measured in kHz (or Hz) and is used to govern the frequency range that you will be able to record. So, what is sample rate? In a nutshell, sample rate is the number of data points that can be captured per second within a piece of digital audio. One of these such parameters is sample rate. Just as there are within video, audio setup has many variables and adjustable parameters which must be taken into consideration. Whilst the concepts of overdubbing and ADR are perfectly acceptable, an inability to capture this audio correctly makes them practically redundant. Sound often gets given the backbench within the video world. Make sure you get your audio settings and recordings right with this important guide from Tim Dunphy.
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