Digital Audio
Sampling frequency, also known as sample rate, defines how many times per second an analogue signal is measured and converted into digital data, directly influencing the accuracy and fidelity of digital audio reproduction.
In digital recording, the sampling frequency determines the highest frequency that can be captured according to the Nyquist theorem, which states that it must be at least twice the highest audio frequency present in the source. For example, a sampling frequency of 44.1 kHz can reproduce frequencies up to 22.05 kHz, matching the upper limit of human hearing.
Higher sampling frequencies such as 48 kHz, 88.2 kHz, 96 kHz, and 192 kHz provide extended frequency response, reduced phase distortion, and greater precision during editing, processing, and conversion between formats. However, they also result in larger file sizes and higher data throughput requirements.
Professional recording and film environments commonly use 48 kHz, while music production often standardises on 44.1 kHz due to its compatibility with CD audio. Modern converters and digital workstations typically support multiple sampling frequencies, allowing engineers to balance sound quality, storage efficiency, and system performance based on project needs.
