US Patent No: 6,473,409

Number of patents in Portfolio can not be more than 2000

Adaptive filtering system and method for adaptively canceling echoes and reducing noise in digital signals

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Abstract

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The present invention is embodied in a system and method for performing spectral analysis of a digital signal having a discrete duration by spectrally decomposing the digital signal at predefined frequencies uniformly distributed over a sampling frequency interval into complex frequency coefficients so that magnitude and phase information at each frequency is immediately available to produce a modulated complex lapped transform (MCLT). The system includes real and imaginary window processors and real and imaginary transform processors. The real and imaginary window processors receive the input signal and apply and compute butterfly coefficients for the real and imaginary parts of the signal to produce resulting real and imaginary vectors, respectively. The real and imaginary transform processors compute spatial transforms on the real and imaginary vectors to produce real and imaginary transform coefficient of the MCLT, respectively. The MCLT is a biorthogonal spectral transformation system, in the sense that the original time domain signal can be reconstructed exactly by an inverse MCLT operator.

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Patent Owner(s)

Patent OwnerAddressTotal Patents
MICROSOFT CORPORATIONREDMOND, WA29040

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Malvar, Henrique S Sammamish, WA 156 2171

Cited Art Landscape

Patent Info (Count) # Cites Year
 
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LUCENT TECHNOLOGIES INC. (1)
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NIPPON TELEGRAPH AND TELEPHONE CORPORATION (1)
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ROCKSTAR BIDCO, LP (1)
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TELEFONAKTIEBOLAGET LM ERICSSON (PUBL) (1)
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The Aerospace Corporation (1)
5,859,788 Modulated lapped transform method 47 1997
 
TQ DELTA, LLC (1)
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UNIVERSITY OF MARYLAND, BALTIMORE (1)
5,339,265 Optimal unified architectures for the real-time computation of time-recursive discrete sinusoidal transforms 18 1992

Patent Citation Ranking

Forward Cite Landscape

Patent Info (Count) # Cites Year
 
MICROSOFT CORPORATION (33)
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7,206,453 Dynamic filtering for lossy compression 4 2001
7,120,197 Motion compensation loop with filtering 11 2002
7,609,763 Advanced bi-directional predictive coding of video frames 14 2003
7,383,180 Constant bitrate media encoding techniques 12 2003
7,343,291 Multi-pass variable bitrate media encoding 28 2003
8,625,680 Bitstream-controlled post-processing filtering 0 2003
7,251,322 Systems and methods for echo cancellation with arbitrary playback sampling rates 3 2004
8,687,709 In-loop deblocking for interlaced video 0 2004
7,590,179 Bitplane coding of prediction mode information in bi-directionally predicted interlaced pictures 6 2004
7,299,175 Normalizing to compensate for block size variation when computing control parameter values for quality and rate control for digital audio 12 2005
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7,277,848 Measuring and using reliability of complexity estimates during quality and rate control for digital audio 11 2005
7,263,482 Accounting for non-monotonicity of quality as a function of quantization in quality and rate control for digital audio 20 2005
7,260,525 Filtering of control parameters in quality and rate control for digital audio 20 2005
7,340,394 Using quality and bit count parameters in quality and rate control for digital audio 5 2005
7,200,276 Rate allocation for mixed content video 2 2005
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8,787,443 Content adaptive deblocking during video encoding and decoding 0 2010
8,819,754 Media streaming with enhanced seek operation 0 2013
 
2236008 ONTARIO INC. (11)
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PANASONIC CORPORATION (8)
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7,542,580 Microphone placement in hearing assistance devices to provide controlled directivity 3 2006
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7,292,638 Transform-based alias cancellation multi-channel tuner 1 2003
7,054,281 Multi-channel tuner using a discrete cosine transform 7 2003
 
NEC CORPORATION (1)
6,580,794 Acoustic echo canceler with a peak impulse response detector 4 1999
 
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