Removing time delays in signal paths

• US 7,742,913 B2
• Filed: 09/29/2006
• Issued: 06/22/2010
• Est. Priority Date: 10/24/2005
• Status: Expired due to Fees

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Pang, Hee Suk, Oh, Hyen O., Lim, Jae Hyun, Jung, Yang Won, Kim, Dong Soo
• Primary Examiner(s): Vo; Huyen X.
• Application Number:
  US11/541,397
• Publication Number:
  US 20070094013A1
• Time in Patent Office: 1,362 Days
• Field of Search: 704500-504, 704/200, 704/203, 704/205, 704/204, 704/220, 704/228, 704/212, 704/201, 704/229, 704/230
• US Class Current: 704/201
• CPC Class Codes: G10L 19/008 Multichannel audio signal coding or decoding using interchannel correlation to reduce redundancy, e.g. joint-stereo, intensity-coding or matrixing
• CPC Class Codes: G10L 19/167 Audio streaming, i.e. formatting and decoding of an encoded audio signal representation into a data stream for transmission or storage purposes
• CPC Class Codes: G10L 19/18 Vocoders using multiple modes
• CPC Class Codes: H04S 7/30 Control circuits for electronic adaptation of the sound field

Abstract

The disclosed embodiments include systems, methods, apparatuses, and computer-readable mediums for compensating one or more signals and/or one or more parameters for time delays in one or more signal processing paths.

Claims

1. A method of decoding an audio signal, comprising:

receiving, in a computer-readable medium selected from the group consisting of a non-volatile computer-readable medium, a volatile computer-readable medium, and combinations thereof, an audio signal including a downmix signal of a time domain and spatial information, the spatial information being delayed within the audio signal;

converting, by one or more processor, the downmix signal of the time domain to a real quadrature mirror filter domain;

converting the downmix signal of the real quadrature mirror filter domain to a complex quadrature mirror filter domain;

combining the downmix signal of the complex quadrature mirror filter domain with the spatial information;

generating an audio signal using the combined downmix signal and spatial information, the audio signal including at least two channel signals; and

outputting the audio signal by an output unit,

wherein, before receiving the audio signal, the spatial information is delayed by an amount of time including an elapsed time of converting the downmix signal to the real quadrature mirror filter domain and an elapsed time of converting the downmix signal to the complex quadrature mirror filter domain.

2. The method of claim 1, wherein the amount of time delay of the spatial information is determined by an operation time of a quadrature mirror filter.

3. A system, comprising:

a processor;

a computer-readable medium selected from the group consisting of a non-volatile computer-readable medium, a volatile computer-readable medium, and combinations thereof, the computer-readable medium having computer-executable instructions stored thereon, which, when executed by the processor, cause the processor to perform the operations of;

receiving an audio signal including a downmix signal of a time domain and spatial information, the spatial information being delayed within the audio signal;

converting the downmix signal of the time domain to a real quadrature mirror filter domain;

converting the downmix signal of the real quadrature mirror filter domain to a complex quadrature mirror filter domain;

combining the downmix signal of the complex quadrature mirror filter domain with the spatial information;

generating an audio signal using the combined downmix signal and the spatial information, the audio signal including at least two channel signals; and

outputting the audio signal by an output unit,

wherein, before receiving the audio signal, the spatial information is delayed by an amount of time including an elapsed time of converting the downmix signal to the real quadrature mirror filter domain and an elapsed time of converting the downmix signal to the complex quadrature mirror filter domain.

4. The system of claim 3, wherein the amount of time delay of the spatial information is determined by an operation time of a quadrature mirror filter.

5. A system comprising:

means for receiving, in at least one of a non-volatile computer-readable medium and a volatile computer-readable medium, an audio signal including a downmix signal of a time domain and spatial information, the spatial information being delayed within the audio signal;

means for converting the downmix signal of the time domain to a real quadrature mirror filter domain;

means for converting the downmix signal of the real quadrature mirror filter domain to a complex quadrature mirror filter domain

means for combining the downmix signal of the complex quadrature mirror filter domain with the spatial information;

means for generating an audio signal using the combined downmix signal and the spatial information, the audio signal including at least two channel signals; and

means for outputting the audio signal,

wherein, before receiving the audio signal, the spatial information is delayed by an amount of time including an elapsed time of converting the downmix signal to the real quadrature mirror filter domain and an elapsed time of converting the downmix signal to the complex quadrature mirror filter domain.

6. The system of claim 5, wherein the amount of time delay of the spatial information is determined by an operation time of a quadrature mirror filter.