Apparatus and method for decoding four channel sound

Details Apparatus and method for decoding four channel sound Apparatus and method for decoding four channel sound

1974-06-03

1976-03-09

Olms, Douglas W.

1791004ST, H04H 500

Patent

active

039432874

ABSTRACT:
An apparatus and method for decoding four individual audio signals to the extent they are contained in first and second composite signals. The first composite signal contains the first individual audio signal in dominant proportion and two other individual audio signals in subdominant proportions. The second composite signal contains the second individual audio signals in dominant proportion and two other individual audio signals in subdominant proportions. In accordance with the invention there is provided a means for measuring the degree of directional predominance of each of the four individual audio signals. Means responsive to the composite signals are employed to form four partially decoded signals, each of the partially decoded signals including a different one of the individual audio signals in dominant proportion and two other individual audio signals in subdominant proportion. The four partially decoded signals are respectively applied to four output terminals. Further provided is a means responsive to the composite signals for forming four enhancement signals, each of the enhancement signals having a different one of the individual signals as its principal component. Each of the enhancement signals is applied to the particular ones of the output terminals at which its principal component is present in subdominant proportion. Each enhancement signal is applied at a relative phase which is the opposite of said signal present in subdominant proportion and at a level which depends on the measured degree of directional predominance of its principal component. In this manner, a selective cancellation of certain subdominant components is achieved.

REFERENCES:
patent: 3786193 (1974-01-01), Tsurushima
patent: 3825684 (1974-07-01), Ito et al.
patent: 3829615 (1974-08-01), Hiramatsu

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