TY - GEN
T1 - A causal Locally Competitive Algorithm for the sparse decomposition of audio signals
AU - Charles, Adam S.
AU - Kressner, Abigail A.
AU - Rozell, Christopher J.
PY - 2011
Y1 - 2011
N2 - While current inference methods can decompose audio signals, they require the entire signal upfront and are therefore ill-suited for real-time applications requiring causal processing. We propose a neurally-inspired, causal, sparse inference scheme based on the Locally Competitive Algorithm (LCA) over a temporal-spectral neighborhood. We demonstrate that this causal inference scheme can achieve lower sparsity levels and better signal fidelity than current filter and threshold approaches. Additionally, for some regimes, the sparsity level approaches those of Matching Pursuit while still maintaining signal integrity.
AB - While current inference methods can decompose audio signals, they require the entire signal upfront and are therefore ill-suited for real-time applications requiring causal processing. We propose a neurally-inspired, causal, sparse inference scheme based on the Locally Competitive Algorithm (LCA) over a temporal-spectral neighborhood. We demonstrate that this causal inference scheme can achieve lower sparsity levels and better signal fidelity than current filter and threshold approaches. Additionally, for some regimes, the sparsity level approaches those of Matching Pursuit while still maintaining signal integrity.
KW - Locally Competitive Algorithm (LCA)
KW - audio processing
KW - causal sparse encoding
KW - convolutional model
UR - http://www.scopus.com/inward/record.url?scp=79954478663&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=79954478663&partnerID=8YFLogxK
U2 - 10.1109/DSP-SPE.2011.5739223
DO - 10.1109/DSP-SPE.2011.5739223
M3 - Conference contribution
AN - SCOPUS:79954478663
SN - 9781612842271
T3 - 2011 Digital Signal Processing and Signal Processing Education Meeting, DSP/SPE 2011 - Proceedings
SP - 265
EP - 270
BT - 2011 Digital Signal Processing and Signal Processing Education Meeting, DSP/SPE 2011 - Proceedings
T2 - 2011 Digital Signal Processing and Signal Processing Education Meeting, DSP/SPE 2011
Y2 - 4 January 2011 through 7 January 2011
ER -