Matrix four-channel decoding system
Surround sound system
Triphonic sound system
MOSFET analog signal squaring circuit
Three-track sterophonic system Patent #: 4747142
ApplicationNo. 07/237986 filed on 08/29/1988
US Classes:381/27, Center channel381/106With amplitude compression/expansion
ExaminersPrimary: Isen, Forester W.
Attorney, Agent or Firm
International ClassesH04S 5/00 (20060101)
H04S 5/02 (20060101)
H04S 3/00 (20060101)
Foreign Application Priority Data1987-08-31 JP
AbstractA stereophonic signal processing circuit is designed to be provided with a pair of level compression circuits compressing peak levels of a pair of stereophonic input signals into 1/2 power each, an arithmetic mean circuit determining an arithmetic mean between a pair of output signals issued from the level compression circuits, and a level expansion circuit expanding a peak level of an output signal from the arithmetic mean circuit into the 2nd power of the level so that an output signal from the level expansion circuit is reproduced midway between individual reproducing positions of the pair of stereophonic input signals. A delay circuit may be connected between the arithmetic mean circuit and the level expansion circuit. The stereophonic signal processing circuit makes it possible to cause more fully the lateralization of a reproduced sound and can be fabricated at a low cost.