Aaron C Warner

US Patent:

7929708, Apr 19, 2011

Filed:

Oct 28, 2004

Appl. No.:

10/975841

Inventors:

Robert Reams - Lynwood WA, US
Jeffrey K. Thompson - Bothell WA, US
Aaron Warner - Seattle WA, US

Assignee:

DTS, Inc. - Calabasas CA

International Classification:

H04R 5/00
H04R 5/02

US Classification:

381 17, 381310

Abstract:

An audio spatial environment engine for converting from an N channel audio system to an M channel audio system, where N is an integer greater than M, is provided. The audio spatial environment engine includes one or more correlators receiving two of the N channels of audio data and eliminating delays between the channels that are irrelevant to an average human listener. One or more Hilbert transform systems each perform a Hilbert transform on one or more of the correlated channels of audio data. One or more summers receive at least one of the correlated channels of audio data and at least one of the Hilbert transformed correlated channels of audio data and generate one of the M channels of audio data.

US Patent:

8099285, Jan 17, 2012

Filed:

Dec 13, 2007

Appl. No.:

12/001851

Inventors:

Brandon Smith - Seattle WA, US
Jeffrey Thompson - Bothell WA, US
Aaron Warner - Seattle WA, US

Assignee:

DTS, Inc. - Calabasas CA

International Classification:

G10L 11/00
G10L 19/00
H04N 7/167

US Classification:

704273, 7042001, 380236

Abstract:

A system for identifying audio data is provided. The system includes a transform system receiving left channel audio data and right channel audio data and generating a plurality of frequency bins of left channel magnitude data, left channel phase data, right channel magnitude data and right channel phase data. A watermarking system receives watermarking data and modifies predetermined frequency bins of the left channel phase data and the right channel phase data to encode the watermarking data. A magnitude system receives the left channel magnitude data and the right channel magnitude data and increases the left channel magnitude data and the right channel magnitude data for one or more of the predetermined frequency bins to a threshold level if the left channel magnitude data and the right channel magnitude data for the corresponding frequency bin is less than the threshold level.

US Patent:

8385556, Feb 26, 2013

Filed:

Aug 15, 2008

Appl. No.:

12/192404

Inventors:

Aaron Warner - Seattle WA, US
Jeffrey Thompson - Bothell WA, US
Robert Reams - Mill Creek WA, US

Assignee:

DTS, Inc. - Calabasas CA

International Classification:

H04R 5/00
H04R 1/40

US Classification:

381 23, 381 21, 381 97, 381106

Abstract:

A system for generating parametric stereo data from phase modulated stereo data is provided. A phase difference system receives left channel data and right channel data and determines a phase difference between the left channel data and the right channel data. A phase difference weighting system receives the phase difference data and generates weighting data to adjust left channel amplitude data and right channel amplitude data based on the phase difference data. A magnitude modification system adjusts the left channel amplitude data and the right channel amplitude data using the weighting data to eliminate phase data in the left channel data and the right channel data.

US Patent:

20060093152, May 4, 2006

Filed:

Oct 28, 2005

Appl. No.:

11/262029

Inventors:

Jeffrey Thompson - Bothell WA, US
Robert Reams - Mill Creek WA, US
Aaron Warner - Seattle WA, US

International Classification:

H04R 5/00

US Classification:

381017000, 381023000, 381001000

Abstract:

An audio spatial environment engine for flexible and scalable up-mixing from an M channel audio system to an N channel audio system, where M and N are integers and N is greater than M, is provided. The input M channel audio is provided to an analysis filter bank which converts the time domain signals into frequency domain signals. Relevant inter-channel spatial cues are extracted from the frequency domain signals on a sub-band basis and are used as parameters to generate adaptive N channel filters which control the spatial placement of a frequency band element in the up-mixed sound field. The N channel filters are smoothed across both time and frequency to limit filter variability which could cause annoying fluctuation effects. The smoothed N channel filters are then applied to adaptive combinations of the frequency domain input signals and are provided to a synthesis filter bank which generates the N channel time domain output signals.

US Patent:

20060093164, May 4, 2006

Filed:

Oct 28, 2005

Appl. No.:

11/262190

Inventors:

Robert Reams - Mill Creek WA, US
Jeffrey Thompson - Bothell WA, US
Aaron Warner - Seattle WA, US

International Classification:

H04B 1/00
H04R 5/00

US Classification:

381119000, 381023000

Abstract:

An audio spatial environment engine is provided for converting between different formats of audio data. The audio spatial environment engine allows for flexible conversion between N-channel data and M-channel data and conversion from M-channel data back to N′-channel data, where N, M, and N′ are integers and where N is not necessarily equal to N′. For example, such systems could be used for the transmission or storage of surround sound data across a network or infrastructure designed for stereo sound data. The audio spatial environment engine provides improved and flexible conversions between different spatial environments due to an advanced dynamic down-mixing unit and a high-resolution frequency band up-mixing unit. The dynamic down-mixing unit includes an intelligent analysis and correction loop capable of correcting for spectral, temporal, and spatial inaccuracies common to many down-mixing methods. The up-mixing unit utilizes the extraction and analysis of important inter-channel spatial cues across high-resolution frequency bands to derive the spatial placement of different frequency elements. The down-mixing and up-mixing units, when used individually or as a system, provide improved sound quality and spatial distinction.

US Patent:

20060106620, May 18, 2006

Filed:

Oct 28, 2005

Appl. No.:

11/261100

Inventors:

Jeffrey Thompson - Bothell WA, US
Robert Reams - Mill Creek WA, US
Aaron Warner - Seattle WA, US

International Classification:

G10L 21/00

US Classification:

704500000

Abstract:

An audio spatial environment engine is provided for converting from an N channel audio system to an M channel audio system, such as in a dynamic down-mixer where N and M are integers and N is greater than M. The dynamic down-mix methodology consists of a static down-mix system utilizing an intelligent analysis and correction loop. The original N-channel audio signals are provided to a static down-mix process which produces a down-mixed M-channel audio signal. That M-channel audio signal is provided to an up-mix process which generates a subsequent N-channel audio signal. Any spectral, temporal, or spatial inaccuracies between the original N-channel audio and the subsequent up-mixed N-channel audio are then identified and corrected in the down-mixed M-channel audio signal over a plurality of frequency bands generating the final down-mixed M-channel audio signal. The corrections performed on the down-mixed M-channel audio signal consist of modifications to the relevant inter-channel spatial cues such as inter-channel level difference (ICLD) and inter-channel coherence (ICC) per frequency band.

US Patent:

20070239295, Oct 11, 2007

Filed:

Feb 23, 2007

Appl. No.:

11/710070

Inventors:

Jeffrey Thompson - Bothell WA, US
Robert Reams - Mill Creek WA, US
Aaron Warner - Seattle WA, US

International Classification:

G06F 17/00

US Classification:

700094000

Abstract:

An audio processing application is provided which utilizes an audio codec encode/decode simulation system and a psychoacoustic model to estimate audible quantization noise that may occur during lossy audio compression. Mask-to-noise ratio values are computed for a plurality of frequency bands and are used to intelligently process an audio signal specifically for a given audio codec. In one exemplary embodiment, the mask-to-noise ratio values are used to reduce the extent of perceived artifacts for lossy compression, such as by modifying the energy and/or coherence of frequency bands in which quantization noise is estimated to exceed the masking threshold.

US Patent:

20070297519, Dec 27, 2007

Filed:

Oct 28, 2005

Appl. No.:

11/666512

Inventors:

Jeffrey Thompson - Bothell WA, US
Robert Reams - Mill Creek WA, US
Aaron Warner - Seattle WA, US

International Classification:

G10L 19/02

US Classification:

375241000, 375E07029

Abstract:

An audio spatial environment engine is provided for converting between different formats of audio data. The audio spatial environment engine () allows for flexible conversion between N-channel data and M-channel data and conversion from M-channel data back to N′-channel data, where N, M, and N′ are integers and where N is not necessarily equal to N′. For example, such systems could be used for the transmission or storage of surround sound data across a network or infrastructure designed for stereo sound data. The audio spatial environment engine provides improved and flexible conversions between different spatial environments due to an advanced dynamic down-mixing unit () and a high-resolution frequency band up-mixing unit (). The dynamic down-mixing unit includes an intelligent: analysis and correction loop () capable of correcting for spectral, temporal, and spatial inaccuracies common to many down-mixing methods. The up-mixing unit utilizes the extraction and analysis of important inter-channel spatial cues across high-resolution frequency bands to derive the spatial placement of different frequency elements. The down-mixing and up-mixing units, when used individually or as a system, provide improved sound quality and spatial distinction.

Author:

Aaron W. Warner

ISBN #:

0765606321