uusintavälikorjaus

Uusintavälikorjaus, often translated as "re-sampling" or "resampling," is a technique used in digital signal processing and other fields to change the sampling rate of a discrete-time signal. This process involves either increasing the sampling rate (upsampling) or decreasing it (downsampling). When increasing the sampling rate, new samples are inserted between existing samples, typically filled with zeros. To avoid aliasing and preserve the signal's information, these new samples are then filtered. When decreasing the sampling rate, some samples are discarded, and again, filtering is crucial to prevent aliasing, which occurs when the new sampling rate is too low to accurately represent the original signal's frequencies.

The primary goal of resampling is to adapt a signal to a different sampling rate required by subsequent processing stages, storage, or transmission. For instance, audio signals might be resampled from a lower quality rate to a higher quality rate for playback on different devices, or a video signal might be downsampled to reduce file size. The effectiveness of resampling depends heavily on the quality of the interpolation and decimation filters used. These filters are designed to smooth the signal and remove unwanted frequency components that could be introduced or distorted by the change in sampling rate. Poorly chosen filters can lead to artifacts such as aliasing, distortion, or loss of high-frequency information.