Sample rate converters are not a specific brand but a category of devices used in the audio and signal processing industries. These converters are produced by various companies worldwide, specializing in digital signal processing (DSP) and audio equipment. For example, companies like Apogee Electronics (USA), RME (Germany), and Prism Sound (UK) manufacture high-quality sample rate converters for professional audio applications. These devices are essential in studios, broadcasting, and telecommunications, enabling seamless conversion between different sampling rates to maintain audio fidelity. Industrial suppliers like Radwell and Grainger may distribute related signal processing equipment, though they typically focus on broader industrial automation and electronics.