David Anderson - Academia.edu (original) (raw)
Papers by David Anderson
Interspeech 2005, 2005
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Interspeech 2004, 2004
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Interspeech 2004, 2004
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2007 Annual Conference & Exposition Proceedings
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2009 IEEE International Conference on Acoustics, Speech and Signal Processing, 2009
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Acoustics, Speech, and Signal Processing, 1988. ICASSP-88., 1988 International Conference on
Lattice reduction-aided equalization techniques have emerged as a low-complexity method to achiev... more Lattice reduction-aided equalization techniques have emerged as a low-complexity method to achieve the same diversity as maximum likelihood detectors. We address the VLSI implementation of these LR-aided equalizers by modifying the CLLL algorithm from a fixed-point hardware perspective. We then apply the modified algorithm together with additional micro-architecture and operation scheduling enhancements to create an updated CLLL processor. Finally, through BER simulations and FPGA synthesis results we demonstrate the suitability of our CLLL processor for integration into a 64-QAM MIMO system.
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The 2002 45th Midwest Symposium on Circuits and Systems, 2002. MWSCAS-2002.
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2007 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing, 2007
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2005 IEEE International Symposium on Circuits and Systems
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In the past researchers have proposed a variety of features that are based on the human auditory ... more In the past researchers have proposed a variety of features that are based on the human auditory system. However none of these features have been able to replace mel-frequency cepstral coefficients (MFCC) as the preferred feature for audio classification problems, either because of computational costs involved or because of their poor performance in the presence of noise. In this paper we present new features derived from a model of the early auditory system. We compare the performance of the new features with MFCC in a four-class audio classification problem and show that they perform better. We also test the noise robustness of the new features in a two-way audio classification problem and show that it outperforms the MFCC. Further, these new features can be implemented in low-power analog VLSI circuitry making them ideal for low-power sensor networks.
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VLSI Design, 2010
Two novel theorems are developed which prove that certain logic functions are more robust to erro... more Two novel theorems are developed which prove that certain logic functions are more robust to errors than others. These theorems are used to construct datapath circuits that give an increased immunity to error over other naive implementations. A link between probabilistic operation and ultra-low energy computing has been shown in prior work. These novel theorems and designs will be used to further improve probabilistic design of ultra-low power datapaths. This culminates in an asynchronous design for the maximum amount of energy savings per a given error rate. Spice simulation results using a commercially available and well-tested 0.25 μm technology are given verifying the ultra-low power, probabilistic full-adder designs. Further, close to 6X energy savings is achieved for a probabilistic full-adder over the deterministic case.
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Proceedings of the IEEE, 2010
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IEEE Transactions on Circuits and Systems I: Regular Papers, 2011
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IEEE Transactions on Circuits and Systems I: Regular Papers, 2005
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Proceedings 2001 Conference on Advanced Research in VLSI. ARVLSI 2001
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Interspeech 2005, 2005
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2015 IEEE Signal Processing and Signal Processing Education Workshop (SP/SPE), 2015
This paper outlines an adaptive extension of likelihood codebook reordering (LCR) vector quantiza... more This paper outlines an adaptive extension of likelihood codebook reordering (LCR) vector quantization. By providing a method for allowing the vector quantization to adapt in a predetermined way, the codebook may be adaptively reordered to allow more efficient encoding by giving preference to encountered vectors in the dictionary. In particular, adaptation allows the trained dictionaries to be more efficient in representing specific data. The difference in the training and testing sets produces different transition matrices which are used to encode testing vectors. The adaptive likelihood codebook reordering vector quantization adapts the a priori transition matrix obtained from training data set to the testing data set on an online instantaneous basis. This method yields improvements in coding rate when entropy coding is applied to the reordered indices obtained from the adaptive version of the LCR algorithm.
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ABSTRACT
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2000 IEEE International Conference on Multimedia and Expo. ICME2000. Proceedings. Latest Advances in the Fast Changing World of Multimedia (Cat. No.00TH8532)
Since 1997, Georgia Tech has been delivering courses across the Atlantic to its sister campus in ... more Since 1997, Georgia Tech has been delivering courses across the Atlantic to its sister campus in France using streaming media. Our experience has shown that there are two significant obstacles that must be overcome before faculty and students are ready to embrace this technology, and accept this delivery mechanism for distance learning courses. First, in order for faculty to become
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Interspeech 2005, 2005
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Interspeech 2004, 2004
Bookmarks Related papers MentionsView impact
Interspeech 2004, 2004
Bookmarks Related papers MentionsView impact
2007 Annual Conference & Exposition Proceedings
Bookmarks Related papers MentionsView impact
Bookmarks Related papers MentionsView impact
2009 IEEE International Conference on Acoustics, Speech and Signal Processing, 2009
Bookmarks Related papers MentionsView impact
Acoustics, Speech, and Signal Processing, 1988. ICASSP-88., 1988 International Conference on
Lattice reduction-aided equalization techniques have emerged as a low-complexity method to achiev... more Lattice reduction-aided equalization techniques have emerged as a low-complexity method to achieve the same diversity as maximum likelihood detectors. We address the VLSI implementation of these LR-aided equalizers by modifying the CLLL algorithm from a fixed-point hardware perspective. We then apply the modified algorithm together with additional micro-architecture and operation scheduling enhancements to create an updated CLLL processor. Finally, through BER simulations and FPGA synthesis results we demonstrate the suitability of our CLLL processor for integration into a 64-QAM MIMO system.
Bookmarks Related papers MentionsView impact
The 2002 45th Midwest Symposium on Circuits and Systems, 2002. MWSCAS-2002.
Bookmarks Related papers MentionsView impact
2007 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing, 2007
Bookmarks Related papers MentionsView impact
2005 IEEE International Symposium on Circuits and Systems
Bookmarks Related papers MentionsView impact
In the past researchers have proposed a variety of features that are based on the human auditory ... more In the past researchers have proposed a variety of features that are based on the human auditory system. However none of these features have been able to replace mel-frequency cepstral coefficients (MFCC) as the preferred feature for audio classification problems, either because of computational costs involved or because of their poor performance in the presence of noise. In this paper we present new features derived from a model of the early auditory system. We compare the performance of the new features with MFCC in a four-class audio classification problem and show that they perform better. We also test the noise robustness of the new features in a two-way audio classification problem and show that it outperforms the MFCC. Further, these new features can be implemented in low-power analog VLSI circuitry making them ideal for low-power sensor networks.
Bookmarks Related papers MentionsView impact
VLSI Design, 2010
Two novel theorems are developed which prove that certain logic functions are more robust to erro... more Two novel theorems are developed which prove that certain logic functions are more robust to errors than others. These theorems are used to construct datapath circuits that give an increased immunity to error over other naive implementations. A link between probabilistic operation and ultra-low energy computing has been shown in prior work. These novel theorems and designs will be used to further improve probabilistic design of ultra-low power datapaths. This culminates in an asynchronous design for the maximum amount of energy savings per a given error rate. Spice simulation results using a commercially available and well-tested 0.25 μm technology are given verifying the ultra-low power, probabilistic full-adder designs. Further, close to 6X energy savings is achieved for a probabilistic full-adder over the deterministic case.
Bookmarks Related papers MentionsView impact
Proceedings of the IEEE, 2010
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IEEE Transactions on Circuits and Systems I: Regular Papers, 2011
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IEEE Transactions on Circuits and Systems I: Regular Papers, 2005
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Proceedings 2001 Conference on Advanced Research in VLSI. ARVLSI 2001
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Interspeech 2005, 2005
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2015 IEEE Signal Processing and Signal Processing Education Workshop (SP/SPE), 2015
This paper outlines an adaptive extension of likelihood codebook reordering (LCR) vector quantiza... more This paper outlines an adaptive extension of likelihood codebook reordering (LCR) vector quantization. By providing a method for allowing the vector quantization to adapt in a predetermined way, the codebook may be adaptively reordered to allow more efficient encoding by giving preference to encountered vectors in the dictionary. In particular, adaptation allows the trained dictionaries to be more efficient in representing specific data. The difference in the training and testing sets produces different transition matrices which are used to encode testing vectors. The adaptive likelihood codebook reordering vector quantization adapts the a priori transition matrix obtained from training data set to the testing data set on an online instantaneous basis. This method yields improvements in coding rate when entropy coding is applied to the reordered indices obtained from the adaptive version of the LCR algorithm.
Bookmarks Related papers MentionsView impact
ABSTRACT
Bookmarks Related papers MentionsView impact
2000 IEEE International Conference on Multimedia and Expo. ICME2000. Proceedings. Latest Advances in the Fast Changing World of Multimedia (Cat. No.00TH8532)
Since 1997, Georgia Tech has been delivering courses across the Atlantic to its sister campus in ... more Since 1997, Georgia Tech has been delivering courses across the Atlantic to its sister campus in France using streaming media. Our experience has shown that there are two significant obstacles that must be overcome before faculty and students are ready to embrace this technology, and accept this delivery mechanism for distance learning courses. First, in order for faculty to become
Bookmarks Related papers MentionsView impact