Audio USB converters are not a specific brand but a category of devices used in the audio industry to convert analog audio signals to digital via USB interfaces, or vice versa. These converters are essential in professional audio, broadcasting, and music production. Companies like Focusrite (UK), Behringer (Germany), and Universal Audio (USA) are prominent manufacturers. Their products include USB audio interfaces, AD/DA converters, and portable recording devices, catering to studios, live sound, and home recording setups.