| 摘要 |
A system including a compact array of microphones in combination with signal combining circuitry, especially suited for use with surround-sound sources, for producing two composite signals LT and RT corresponding to those required by an SQ-matrix-type quadraphonic system to establish the directional position of the sound sources. The signals produced by selected ones of the microphones are combined to produce an auxiliary signal which contains, to the extent they are present, equal proportions of signals corresponding to the signals LF, RF, LB and RB of the SQ quadraphonic system which exhibit an equal angular relationship respecting corresponding signals in a composite signal representing the sum of LT and RT. The auxiliary signal enables decoding of the directional signals in the 4-3-4 or the theta -3-4 modes.
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