Mätfrekvenser

Mätfrekvenser, or sampling frequencies, refer to the rate at which a continuous signal is sampled to be converted into a discrete digital signal. This process is fundamental in digital signal processing, audio recording, and image acquisition. The sampling frequency determines how often an analog signal's amplitude is measured and recorded at specific points in time.

A higher sampling frequency generally results in a more accurate digital representation of the original analog signal. This is because more data points are captured, allowing for a finer resolution of the signal's variations. According to the Nyquist-Shannon sampling theorem, the sampling frequency must be at least twice the highest frequency component present in the analog signal to avoid aliasing. Aliasing is a distortion that occurs when the sampling frequency is too low, causing high frequencies to be misinterpreted as lower frequencies.

Common sampling frequencies vary depending on the application. In digital audio, CD quality typically uses a sampling frequency of 44.1 kHz, while professional audio may use 96 kHz or even higher. In video, frame rates are analogous to sampling frequencies, determining how often still images are captured and displayed to create the illusion of motion. The choice of mätfrekvenser is a critical trade-off between signal fidelity and data storage or processing requirements.