Audio processor for single, channel, matrixed two-channel and un- matrixed two-channel signals

摘要

Audio signals recovered from a video disc record are applied to a dual mode decoder matrix via track and hold circuits which mute the audio signals in response to defect indicating signals and player mode control signals. A selected one of the mode control signals is applied to the matrix for causing the matrix to form sum and difference output signals at first and second output terminals thereof when at a first logic level and for causing the matrix to produce identical output signals at the output terminals when at a second logic level. Logic circuitry controls the muting and the matrix operating mode to provide compatibility with monophonic, matrixed two channel (e.g., stereophonic) and un-matrixed two channel (e.g., bilingual) video disc records and suppression of record noise in all operating modes.