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Digital Theater Systems, Inc.

Digital Theater System, Inc.

Beard, Terry D.

Terry D Beard

James S Ketcham

Joseph Dellaria

A method and circuit for deriving a set of multichannel audio signals from a conventional monaural or stereo audio signal uses an auxiliary multichannel spectral mapping data stream. Audio can be played back in stereo and multichannel formats from a conventional stereo signal on compact discs, FM radio, or other stereo or monaural delivery systems. The invention reduces the data rate needed for the transmission of multichannel digital audio.

Multichannel spectral mapping audio apparatus and method with dynamically varying mapping coefficients

Multichannel spectral mapping audio apparatus and method

A personal hearing control system includes a microphone located within a user's sealed ear canal, a speaker having a diaphragm which directs sound into the ear canal, and a controller which drives the speaker such that the system emulates the acoustics of the user's open ear canal. Also provided are a microphone located on the outer ear side of the sealed ear canal, which is coupled to a handheld interface unit having multiple inputs and operating modes. A user-selected input is processed by the interface unit, and the processed signal is coupled to the speaker. In one operating mode, the output of the outer ear mic is processed so as to cancel sound that leaks from the outer ear to the inner ear side of the seal.

Personal hearing control system and method

Multichannel spectral vector mapping audio apparatus and method

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Westlake Village, CA, United States of America

Terry D Beard