Title: Matrix four-channel decoding system

Abstract: To the output side of a matrix four-channel decoder for producing four outputs while controlling the mixing coefficients of left and right composite signals in accordance with the level or instantaneous amplitude relationship between directional audio input signals contained in the composite signals are connected first and second low frequency mixers respectively receiving front pair outputs and back pair outputs. The mixers respectively mix two input signals supplied thereto with each other when they fall within a low frequency range, thereby developing mixed outputs thereof at its two output terminals, and, when they fall within the high frequency range, develop the two input signals at its two output terminals respectively. Each of mixed outputs of the first mixer is a sum of the composite signals while each of the mixed outputs of the second mixer is a difference signal thereof.

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Inventors: Takahashi, Susumu (Tokyo, JA)

Application Number: 497959
Filing Date: 1974-08-16
Publication_date: 1976-01-20
Assignee: Sansui Electric Co., Ltd. (Tokyo, JA)
Primary Class(es): 381/22 369/89, 381/21
Other Classes:
US Patent Ref:

2904632	Sep, 1959	Levy	179/1.
3094587	Jun, 1963	Dow	179/1.
3786193	Jan, 1974	Tsurushima	179/100.
3825684	Jul, 1974	Ito et al.	179/100.

Other Refs:
Primary Examiner: Olms, Douglas W.
Assistant Examiner:
Attorney: Harris, Kern, Wallen & Tinsley