Quadrphonic sound equipment using dual composite signals - has four loudspeakers receiving dual compositie signals to produce phantom sound sources

摘要

An equipment for quadraphonic transmission of sound uses three or four channels. The equipment has four microphones (1, 2, 3, 4) located at the corners of a diamond shape. The four separate signals from the microphones (1, 2, 3, 4) are supplied to quadrophonic encoder (5) which generates a multiplexed signal. The multiplexed signal is transmitted by an installation (6) and decoded by a decoder (7). The sounds are reproduced by four loudspeakers (8, 9, 10, 11) located at the corners of a square. These loudspeakers (8, 9, 10, 11) receive dual composite signals and form phantom sound sources (12, 13, 14, 15) at the corners of a diamond shape.