51
Wei Ge Chen, Ming Chieh Lee: Techniques for quantization of spectral data in transcoding. Microsoft Corporation, Klarquist Sparkman, June 29, 2004: US06757648 (16 worldwide citation)

A transcoder reduces excess requantization error in quantization of spectral data. The transcoder phase shifts data decompressed by a decompressor. The phase shifting causes a change to corresponding spectral data produced in later transform coding of the decompressed data. When the spectral data is ...


52
Naveen Thumpudi, Wei Ge Chen: Compressing and decompressing weight factors using temporal prediction for audio data. Microsoft Corporation, Klarquist Sparkman, September 21, 2010: US07801735 (15 worldwide citation)

An audio encoder and decoder use architectures and techniques that improve the efficiency of quantization (e.g., weighting) and inverse quantization (e.g., inverse weighting) in audio coding and decoding. The described strategies include various techniques and tools, which can be used in combination ...


53
Naveen Thumpudi, Wei Ge Chen: Constant bitrate media encoding techniques. Microsoft Corporation, Klarquist Sparkman, June 3, 2008: US07383180 (14 worldwide citation)

CBR control strategies provide constant or relatively constant bitrate output with variable quality. The control strategies include various techniques and tools, which can be used in combination or independently. For example, an audio encoder uses a trellis in two-pass or delayed-decision CBR encodi ...


54
Sanjeev Mehrotra, Wei Ge Chen, Henrique Sarmento Malvar: Coding with improved time resolution for selected segments via adaptive block transformation of a group of samples from a subband decomposition. Microsoft Corporation, Klarquist Sparkman, June 9, 2009: US07546240 (14 worldwide citation)

A transform coder is described that performs a time-split transform in addition to a discrete cosine type transform. A time-split transform is selectively performed based on characteristics of media data. Transient detection identifies a changing signal characteristic, such as a transient in media d ...


55
Wei Ge Chen, Naveen Thumpudi, Ming Chieh Lee: Normalizing to compensate for block size variation when computing control parameter values for quality and rate control for digital audio. Microsoft Corporation, Klarquist Sparkman, November 20, 2007: US07299175 (13 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 ...


56
Chuang Gu, Ming Chieh Lee, Wei ge Chen: Morphological pure speech detection using valley percentage. Microsoft Corporation, Klarquist Sparkman Campbell Leigh & Whinston, March 20, 2001: US06205422 (13 worldwide citation)

A human speech detection method detects pure-speech signals in an audio signal containing a mixture of pure-speech and non-speech or mixed-speech signals. The method accurately detects the pure-speech signals by computing a novel Valley Percentage feature from the audio signal and then classifying t ...


57
Naveen Thumpudi, Wei Ge Chen: Multi-channel audio encoding and decoding with different window configurations. Microsoft Corporation, Klarquist Sparkman, December 28, 2010: US07860720 (12 worldwide citation)

An audio encoder and decoder use architectures and techniques that improve the efficiency of multi-channel audio coding and decoding. The described strategies include various techniques and tools, which can be used in combination or independently. For example, an audio encoder performs a pre-process ...


58
Wei Ge Chen, Naveen Thumpudi, Ming Chieh Lee: Measuring and using reliability of complexity estimates during quality and rate control for digital audio. Microsoft Corporation, Klarquist Sparkman, October 2, 2007: US07277848 (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 ...


59
Wei Ge Chen, Naveen Thumpudi, Ming Chieh Lee: Accounting for non-monotonicity of quality as a function of quantization in quality and rate control for digital audio. Microsoft Corporation, Klarquist Sparkman, November 13, 2007: US07295971 (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 ...


60
Wei Ge Chen, Ming Chieh Lee, Naveen Thumpudi: Quality control quantization loop and bitrate control quantization loop for quality and rate control for digital audio. Microsoft Corporation, Klarguist Sparkman, November 13, 2007: US07295973 (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 ...