H - Electricity – 04 – R
Patent
H - Electricity
04
R
179/9
H04R 5/04 (2006.01)
Patent
CA 1037877
A B S T R A C T There is disclosed a sound system for producing at least three and typically four sound outputs from respectively different directions on a sphere about a listener wherein the sound content per se and the directional informa- tion are encoded on a conventional standardized two-channel record or on a conventional two-channel broadcasting medium such as stereo FM. The system is maximally compatible with existing systems in the sense that reproduction on existing two-direction (stereo) or one-direction (mono) sound systems is com- pletely satisfactory although, of course, the extent of directionality re- production is limited by the inherent characteristics of such existing systems. The four sound inputs are fed to two sound channels, for example stereo re- cording or transmission channels. Each of the four sound input channels is fed in part to each of the two stereo channels with preselected amplitude and phase relationships which define fully the position angle of the signal in space. Conventional analog computer electronic circuits may be utilized to transform the four sound input signals into two stereo channels according to prescribed formulae. The system provides for reproduction of sound from four loudspeakers located, for example, in the four corners of a room. The two stereo channels are combined according to preselected formulae setting forth certain amplitude and phase relationships to produce four output sound channels. Assuming these four directions correspond to directions of the four input sound channels, the sound originating from a particular sound input channel is reproduced predominantly in the corresponding loudspeaker. In generalizations of the system, the number of inputs and the number of loudspeakers may be greater or less than four (but always more than two) and the numbers and/or directions of the input sound channels may not correspond to the numbers and directions of the outputs feeding the loudspeakers.
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