What is “sample rate”?

In order to represent an analog signal – such as a varying voltage or acoustic signal level – in digital form, that analog signal is sampled at precisely-spaced intervals in time. In the case of CD audio, for example, the signal has been sampled 44,100 times per second, or at 44.1 kHz.

In the case of a miniDSP unit with analog input, the analog signal is sampled at the sample rate of the plugin (48 kHz or 96 kHz, depending on the plugin). Digital inputs are re-sampled by an asynchronous sample rate converter (ASRC), so that the sample rate of the audio signal matches the sample rate of the plugin.

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