Electrical audio signal processing systems and devices – Binaural and stereophonic – Pseudo stereophonic
Patent
1997-05-16
1999-10-19
Harvey, Minsun Oh
Electrical audio signal processing systems and devices
Binaural and stereophonic
Pseudo stereophonic
381 28, H04R 500
Patent
active
059701536
ABSTRACT:
A stereophonic signal processing system provides optimal spatial enhancement in a compact stereo sound system having limited physical separation between two relatively small stereo loudspeakers with accordingly limited low-frequency output capability. A difference signal is derived from the left and right stereo signals by subtraction in a a differential amplifier circuit, which may be made frequency-dependent so that the rejection of correlated information decreases with increasing frequency. The difference signal is processed through a frequency equalizer circuit, and an inverted version is derived via an inverter; the non-inverted and inverted difference signals are filtered according to a high-pass filter function having an upper-bass cutoff frequency selected to avoid excessive spatialization at low frequencies. The left and right stereo signals are filtered according to a transfer function having low-bass cutoff frequency selected to minimize reproduction distortion by minimizing low frequency signal components below an effective frequency range of the loudspeakers. The filtered stereo signals are separately mixed in optimal proportion with the equalized and filtered difference signals, thereby providing optimal spatial enhancement for small and closely-spaced stereo loudspeakers.
REFERENCES:
patent: 4329544 (1982-05-01), Yamada
patent: 4812921 (1989-03-01), Mitsuhashi
patent: 5524053 (1996-06-01), Iwamatsu
Harman Motive Inc.
Harvey Minsun Oh
McTaggart J. E.
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