Audio enhancement

surround sound technology for home cinema and cinema; typically having a 5.1 or 7.1 setup with additional ceiling speakers or ceiling-directed speakers for home cinemas

process of removing noise from a signal

A line of noise reduction systems for reel-to-reel and cassette tape recorders

class of sound effect

changing the balance of frequency components in an audio signal

QSound is the original name for a positional three-dimensional (3D) sound processing algorithm made by QSound Labs that creates 3D audio effects from multiple monophonic sources and sums the outputs to two channels for presentation over regular stereo speakers.