resamplingové

Resampling is a digital signal processing or image processing technique used to change the sampling rate of a digitized signal. It involves either increasing or decreasing the number of samples in a signal, which can be performed using various algorithms.

One method of resampling is interpolation, which involves estimating the value of new samples based on the existing ones. This can be done using techniques such as linear or spline interpolation, where the value of new samples is determined by the surrounding existing samples. Another method is decimation, which involves discarding samples from a high-rate signal to produce a lower-rate signal.

Resampling is commonly used in audio processing, where it is applied to change the frequency (pitch) of a sound. For instance, slowing down a high-pitched voice in a sound recording would require resampling at a lower sampling rate. Similarly, in image processing, resampling is applied to resize images without degrading their quality.

In digital signal processing, resampling is often used to "unsqueeze" or "unsqueeze" a signal by discarding samples at a regular interval. For instance, an audio CD stores sound at 44.1 kHz, while headphones or car stereos may convert the signal to 48 kHz. Resampling is necessary to convert between these sampling rates.

Resampling techniques require consideration of the Sears-Shannon sampling theorem, which dictates that the sampling rate must be at least twice the highest frequency component of the signal to avoid aliasing artifacts. If the resampling is performed without proper attention to the aliasing artifacts, it may result in distorted output.