Qsound Labs, Inc.

Qsound Ltd.

Mark Williams

Danny D Lowe

William Gonnason

Scott Willing

Terry K Cashion

Simon Williams

John Eric Arthur

Don Lafont

Paul Burrowes

Monaural inputs are accepted for presentation to a pair of speakers. The output sound image from that pair of speakers is such that a listener will perceive that the sound is stereo and that certain sounds come from a non-existent center speaker and that other sounds come from locations beyond the physical boundaries of the two speakers. The system operates to preserve full tone range at both speakers and does not split the sound from a particular instrument between both speakers. The system can be used to provide sound signals to the rear speakers of a multiple speaker system when the sound input to the rear speakers is either monaural or stereo.

Method and system for sound expansion

A system for enhancing the effect of stereo audio signals while maintaining the central audio image includes an expander circuit that tracks the monaural information that is common to both left and right channels and that uses such monaural information to control variable attenuators that influence the inputs to the left and right audio image placement filters.

Apparatus for enhancing stereo effect with central sound image

The sound field in a stereo reproduction system is enhanced by a preprocessor that removes a portion of the audio information that is common or substantially common to both the left and right stereo input signals before processing the signals in left and right sound placement filters. The left and right placement filter output signals, from which a portion of the common audio information was previously removed before processing, are added to the right and left stereo input signals, respectively, to produce enhanced sound field stereo output signals. The input signals that do not undergo placement processing can be delayed in delay filters to improve coherency when the signals are added and both the placement filters and the delay filters can be implemented by a series of cascaded bi-quadratic filters.

Stereo enhancement system including sound localization filters

The sound field in a stereo reproduction system is enhanced by a preprocessor that removes a portion of the audio information that is common or substantially common to both the left and right stereo input signals before processing the signals in left and right sound placement filters. The left and right placement filter output signals, from which a portion of the common audio information was previously removed before processing, are added to the right and left stereo input signals, respectively, to produce enhanced sound field stereo output signals. The input signals that do not undergo placement processing are delayed in delay filters so that coherency is maintained when the signals are added and both the placement filters and the delay filters can be implemented by a series of cascaded bi-quadratic filters.

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Calgary, Canada

Mark Williams