IP Library › Granted Patent US 8,385,556
Granted Patent B1
US 8,385,556 · App. 12/192,404 · Granted Feb 26, 2013

Parametric stereo conversion system and method

Inventors: Aaron Warner (Seattle, WA); Jeffrey Thompson (Bothell, WA); Robert Reams (Mill Creek, WA)
Assignee: DTS, Inc.
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Quick Facts
Patent No.
US 8,385,556
App. No.
12/192,404
Filed
Aug 15, 2008
Granted
Feb 26, 2013
Kind
B1
Art Unit
2896
USPC
381/1
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.

Claims (16)

1. A system for generating parametric stereo data from phase modulated stereo data comprising:

a phase difference system receiving left channel audio data and right channel audio data and generating phase difference data based on a phase difference between left channel frequency domain data generated from the left channel audio data and right channel frequency domain data generated from the right channel audio data, wherein the left channel frequency domain data comprises left channel amplitude data and left channel phase data, and the right channel frequency domain data comprises right channel amplitude data and right channel phase data;

a phase difference weighting system receiving the phase difference data and generating weighting data to adjust the left channel amplitude data and the right channel amplitude data based on the phase difference data; and

a magnitude modification system adjusting the left channel amplitude data and the right channel amplitude data using the weighting data and eliminating the left channel phase data from the left channel frequency domain data and the right channel phase data from the right channel frequency domain data.

2. The system of claim 1 wherein the phase difference weighting system receives a plurality of frames of left channel frequency domain data and right channel frequency domain data.

3. The system of claim 2 further comprising a buffer system storing the phase difference data between the left channel frequency domain data and the right channel frequency domain data for two or more corresponding frames of left channel frequency domain data and right channel frequency domain data.

4. The system of claim 1 further comprising a frequency domain to time domain conversion system receiving the left channel frequency domain data with the left channel phase data eliminated and the right channel frequency domain data with the right channel phase data eliminated from the magnitude modification system and converting the left channel frequency domain data and the right channel frequency domain data into amplitude adjusted left channel time domain data and amplitude adjusted right channel time domain data.

5. A method for generating parametric audio data from phase modulated audio data comprising:

converting a first channel audio data from a time domain signal to first channel frequency domain data, wherein the first channel frequency domain data comprises first channel amplitude data and first channel phase data;

converting a second channel audio data from a time domain signal to second channel frequency domain data wherein the second channel frequency domain data comprises second channel amplitude data and second channel phase data;

determining a phase difference between the first channel frequency domain data and the second channel frequency domain data;

determining weighting data to apply to the first channel amplitude data and the second channel amplitude data based on the phase difference between the first channel frequency domain data and the second channel frequency domain data; and

adjusting the first channel amplitude data with the weighting data;

adjusting the second channel amplitude data with the weighting data;

eliminating the first channel phase data from the first channel frequency domain data; and

eliminating the second channel phase data from the second channel frequency domain data.

Assignments (7)
RELEASE OF SECURITY INTEREST Recorded Jun 11, 2020
From: ROYAL BANK OF CANADA
To: TESSERA, INC.; INVENSAS BONDING TECHNOLOGIES, INC. (F/K/A ZIPTRONIX, INC.); FOTONATION CORPORATION (F/K/A DIGITALOPTICS CORPORATION AND F/K/A DIGITALOPTICS CORPORATION MEMS); INVENSAS CORPORATION; TESSERA ADVANCED TECHNOLOGIES, INC; DTS, INC.; DTS LLC; PHORUS, INC.; IBIQUITY DIGITAL CORPORATION
Reel/Frame 052920/0001 →
SECURITY INTEREST Recorded Jun 1, 2020
From: ROVI SOLUTIONS CORPORATION; ROVI TECHNOLOGIES CORPORATION; ROVI GUIDES, INC.; TIVO SOLUTIONS INC.; VEVEO, INC.; INVENSAS CORPORATION; INVENSAS BONDING TECHNOLOGIES, INC.; TESSERA, INC.; TESSERA ADVANCED TECHNOLOGIES, INC.; DTS, INC.; PHORUS, INC.; IBIQUITY DIGITAL CORPORATION
To: BANK OF AMERICA, N.A.
Reel/Frame 053468/0001 →
RELEASE OF SECURITY INTEREST Recorded Dec 6, 2016
From: WELLS FARGO BANK, NATIONAL ASSOCIATION
To: DTS, INC.
Reel/Frame 040821/0083 →
SECURITY INTEREST Recorded Dec 2, 2016
From: INVENSAS CORPORATION; TESSERA, INC.; TESSERA ADVANCED TECHNOLOGIES, INC.; ZIPTRONIX, INC.; DIGITALOPTICS CORPORATION; DIGITALOPTICS CORPORATION MEMS; DTS, LLC; DTS, INC.; PHORUS, INC.; IBIQUITY DIGITAL CORPORATION
To: ROYAL BANK OF CANADA, AS COLLATERAL AGENT
Reel/Frame 040797/0001 →
SECURITY INTEREST Recorded Nov 2, 2015
From: DTS, INC.
To: WELLS FARGO BANK, NATIONAL ASSOCIATION, AS ADMINISTRATIVE AGENT
Reel/Frame 037032/0109 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jan 27, 2009
From: NEURAL AUDIO CORPORATION
To: DTS, INC.
Reel/Frame 022165/0435 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Aug 25, 2008
From: WARNER, AARON; THOMPSON, JEFFREY; REAMS, ROBERT
To: NEURAL AUDIO CORPORATION
Reel/Frame 021437/0306 →
Continuity (1)
Provisional Application 60965227 · Aug 17, 2007