Sound system with source material and surround timbre response c

Details Sound system with source material and surround timbre response c Sound system with source material and surround timbre response c

1989-06-20

1991-08-27

Envall, Jr., Roy N.

Dynamic information storage or retrieval

Storage or retrieval of spatially related acoustic signals

Quadraphonic

381 20, G11B 2002

Patent

active

050439707

ABSTRACT:
Spectral imbalance (alteration in timbre) when playing home video versions of motion pictures is overcome by re-equalization according to a unique correction response curve which compensates for the equalization for playback in large theater-sized auditoriums inherent in motion picture soundtracks. Surround-sound home playback of motion pictures is enhanced by employing main channel loudspeakers that produce generally direct sound fields and surround channel loudspeakers that produce gnerally diffuse sound fields. In addition, the reproduced surround-sound channel is further enhanced by decreasing the interaural cross-correlation of the surround-sound channel sound field and by reducing comb filtering effects in the surround-sound channel at listening positions within the room, preferably by introducing slight pitch shifting in the signals applied to multiple surround loudspeakers. Preferably, further equalization is applied to the reproduced surround channel to compensate for the differences in listener perceived timbre between the surround-sound channel and the main channels.

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