Sound field producing apparatus

Details Sound field producing apparatus Sound field producing apparatus

1987-02-04

1989-03-21

Isen, Forester W.

Electrical audio signal processing systems and devices

Binaural and stereophonic

Hearing aid

H04R 502

Patent

active

048151335

ABSTRACT:
A sound field producing apparatus operatively connected to a stereophonic sound source and adapted to supply audio signals to a loudspeaker system, comprising an indirect sound extracting circuit for extracting indirect sound components by extracting a difference signal representing the difference between right and left input signals. The difference signal is phase-inverted to obtain an inverted difference signal. Two mixing circuits are provided for mixing the right and left input signal, the difference signal and the inverted difference signal to supply mixed signals. Loudspeakers are disposed on the right and left both in front of and to the rear of a listener and are driven by the mixed signals from the mixing circuits.

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patent: 4635288 (1987-01-01), Stadius
patent: 4677674 (1987-06-01), Snyder

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