61
Wei Ge Chen, Naveen Thumpudi, Ming Chieh Lee: Correcting model bias during quality and rate control for digital audio. Microsoft Corporation, Klarquist Sparkman, October 16, 2007: US07283952 (12 worldwide citation)

An audio encoder regulates quality and bitrate with a control strategy. The strategy includes several features. First, an encoder regulates quantization using quality, minimum bit count, and maximum bit count parameters. Second, an encoder regulates quantization using a noise measure that indicates ...


62
Christopher Messer, Naveen Thumpudi, Raymond Cheng, Serge Smirnov, Wei ge Chen, Timothy Onders: Digital audio processing. Microsoft Corporation, March 2, 2010: US07672743 (12 worldwide citation)

A compressed digital audio signal is transmitted from an audio source along a connection wire to an audio receiver. The digital audio signal can encode digital audio data having different sampling frequencies, frames sizes, and other information. The audio receiver that receives the digital audio si ...


63
Wei Ge Chen, Naveen Thumpudi, Ming Chieh Lee: Quality improvement techniques in an audio encoder. Microsoft Corporation, Klarquist Sparkman, October 8, 2013: US08554569 (10 worldwide citation)

An audio encoder implements multi-channel coding decision, band truncation, multi-channel rematrixing, and header reduction techniques to improve quality and coding efficiency. In the multi-channel coding decision technique, the audio encoder dynamically selects between joint and independent coding ...


64
Wei Ge Chen, Naveen Thumpudi, Ming Chieh Lee: Quality improvement techniques in an audio encoder. Microsoft Corporation, Klarquist Sparkman, March 29, 2011: US07917369 (10 worldwide citation)

An audio encoder implements multi-channel coding decision, band truncation, multi-channel rematrixing, and header reduction techniques to improve quality and coding efficiency. In the multi-channel coding decision technique, the audio encoder dynamically selects between joint and independent coding ...


65
Wei Ge Chen, Ming Chieh Lee, Naveen Thumpudi: Multi-channel audio encoding/decoding with parametric compression/decompression and weight factors. Microsoft Corporation, Klarquist Sparkman, April 19, 2011: US07930171 (10 worldwide citation)

The invention includes several techniques and tools, which can be used in combination or separately. For example, an audio encoder can encode information directly using coding processes that include a windowed overlapped transform, a selective multi-channel transform, scalar quantization and entropy ...


66
Kazuhito Koishida, Feng Zhuge, Hosam A Khalil, Tian Wang, Wei ge Chen: Gain constrained noise suppression. Microsoft Corporation, Klarquist Sparkman, November 18, 2008: US07454332 (9 worldwide citation)

A gain-constrained noise suppression for speech more precisely estimates noise, including during speech, to reduce musical noise artifacts introduced from noise suppression. The noise suppression operates by applying a spectral gain G(m, k) to each short-time spectrum value S(m, k) of a speech signa ...


67
Sanjeev Mehrotra, Wei Ge Chen: Complex cross-correlation parameters for multi-channel audio. Microsoft Corporation, Klarquist Sparkman, May 29, 2012: US08190425 (8 worldwide citation)

An audio encoder encodes a combined channel (e.g., a sum channel) for a group of plural physical audio channels. The encoder determines plural parameters for representing individual physical channels of the group as modified versions of the encoded combined channel. The plural parameters comprise ra ...


68
Sanjeev Mehrotra, Wei Ge Chen, Kazuhito Koishida, Chao He: Shape and scale parameters for extended-band frequency coding. Microsoft Corporation, Klarquist Sparkman, May 31, 2011: US07953604 (8 worldwide citation)

An audio encoder performs frequency extension coding that comprises determining one or more shape parameters using a displacement vector that corresponds to a displacement of an even number (e.g., an even number of sub-bands between a sub-band in a baseband frequency range and a sub-band in an exten ...


69
Hosam A Khalil, Tian Wang, Kazuhito Koishida, Xiaoqin Sun, Wei Ge Chen: Robust decoder. Microsoft Corporation, Klarquist Sparkman, September 15, 2009: US07590531 (8 worldwide citation)

Techniques and tools related to delayed or lost coded audio information are described. For example, a concealment technique for one or more missing frames is selected based on one or more factors that include a classification of each of one or more available frames near the one or more missing frame ...


70
Wei Ge Chen, Naveen Thumpudi, Ming Chieh Lee: Using quality and bit count parameters in quality and rate control for digital audio. Microsoft Corporation, Klarquist Sparkman, March 4, 2008: US07340394 (8 worldwide citation)

An audio encoder regulates quality and bitrate with a control strategy. The strategy includes several features. First, an encoder regulates quantization using quality, minimum bit count, and maximum bit count parameters. Second, an encoder regulates quantization using a noise measure that indicates ...