This paper presents a high-throughput, low-latency, hardware-efficient fixed-point implementation of the fast affine projection (FAP) algorithm. The proposed architecture utilizes reusable distributed arithmetic (RDA)...
详细信息
ISBN:
(纸本)9781424423538
This paper presents a high-throughput, low-latency, hardware-efficient fixed-point implementation of the fast affine projection (FAP) algorithm. The proposed architecture utilizes reusable distributed arithmetic (RDA) in combination with optimizations in the update process to enable the coefficients to be updated in a fixed number of cycles independent of filter length. Fixed-point simulations show that the effect of replacing some of the multiplications with arithmetic shifts is minor, with RDA-FAP maintaining a faster convergence rate than NLMS. The proposed design is also compared against a multiplier-based design in terms of number of computations and number of clock cycles needed for a single FAP update cycle.
We describe an embedded hidden Markov model (HMM)-based approach for face detection and recognition that uses an efficient set of observation vectors obtained from the 2D-DCT coefficients. The embedded HMM can model t...
详细信息
We describe an embedded hidden Markov model (HMM)-based approach for face detection and recognition that uses an efficient set of observation vectors obtained from the 2D-DCT coefficients. The embedded HMM can model the two dimensional data better than the one-dimensional HMM and is computationally less complex than the two-dimensional HMM. This model is appropriate for face images since it exploits an important facial characteristic: frontal faces preserve the same structure of "super states" from top to bottom, and also the same left-to-right structure of "states" inside each of these "super states".
In this paper, we consider the problem of detecting and locating buried landmines and subsurface objects by using seismic waves measured with sources and receivers on the surface. An imaging algorithm is proposed whic...
详细信息
In this paper, we consider the problem of detecting and locating buried landmines and subsurface objects by using seismic waves measured with sources and receivers on the surface. An imaging algorithm is proposed which uses the separated forward and reflected waves obtained via a Prony-based spectrum analysis technique. The imaging algorithm is followed by an energy detector. The resulting algorithms will are verified by using the experimental data containing mines and clutter
A variation on the quadtree algorithm for ultra-wideband, wide-angle (UWB-WA) SAR imaging that uses the /spl omega/-k algorithm for final stage focusing is introduced. Several signalprocessing techniques appropriate ...
详细信息
ISBN:
(纸本)0780367073
A variation on the quadtree algorithm for ultra-wideband, wide-angle (UWB-WA) SAR imaging that uses the /spl omega/-k algorithm for final stage focusing is introduced. Several signalprocessing techniques appropriate to the requirements of UWB-WA SAR, and that prevent errors and artifacts in the /spl omega/-k focusing are reviewed. These techniques include spatial and temporal shifts for spotlight data, elimination of ghost targets, and adjustments needed to account for the virtual sampling of the quadtree algorithm. In order to justify these techniques, a simple Fourier-based model of the imaging problem appropriate to UWB-WA SAR is presented.
A compression scheme for diverse speech and audio signals is proposed. In this scheme, signals are analyzed with a 2-band QMF filter bank followed by the application of a modulated lapped biorthogonal transform (MLBT)...
详细信息
A compression scheme for diverse speech and audio signals is proposed. In this scheme, signals are analyzed with a 2-band QMF filter bank followed by the application of a modulated lapped biorthogonal transform (MLBT) to each of the filter bank channels. Subsequent encoding of transform coefficients is performed using Laplacian optimized scalar and vector quantizers, whose rates are determined by an estimated noise threshold, i.e., masking threshold. Listening tests show that the coder achieves a quality at 32 kbits/s that is preferred over the ITU G.722 coder at 64 kbits/s, for speech, music, and more diverse signals consisting of speech in the presence of eventful background sounds. Both the delay of the coder, at 40 ms, and the level of complexity are moderate.
A new directional filter bank for image analysis and classification is proposed. This paper introduces an improved structure in order to visualize subband outputs of the directional filter banks, while retaining the a...
详细信息
A new directional filter bank for image analysis and classification is proposed. This paper introduces an improved structure in order to visualize subband outputs of the directional filter banks, while retaining the attractive properties of the original directional filter banks such as 1-D separable filtering, perfect reconstruction, and maximal decimation. Using this structure, any arbitrary 2/sup n/ band directional filter bank can be implemented by cascading simple directional filter bank blocks, unlike the original structure that needs a parallel structure for visualizing subband outputs. Also, in order to have nondistorted phase information in the subbands for visualization, both FIR and IIR filter prototypes that can be implemented efficiently are provided for linear phase filtering. This paper shows the approach proposed here can be applied to image analysis and classification.
In this paper, a stochastic-parametric model is developed for simulating the temporal and spectral nonstationary characteristics of ground motion sequences. In the proposed model, after extracting the wavelet coeffici...
详细信息
A fast N-step search algorithm for rate-constrained motion estimation is presented. The motion vectors are selected from a search window based on a rate-distortion criterion by successively eliminating the search posi...
详细信息
A fast N-step search algorithm for rate-constrained motion estimation is presented. The motion vectors are selected from a search window based on a rate-distortion criterion by successively eliminating the search positions at each step. The performance of the proposed algorithm is identical to the performance of the conventional rate-constrained N-step search algorithm, with considerable reduction in computation. Computational savings increase in parallel with the increase in the rate constraint and the number of steps.
A computationally efficient exhaustive search algorithm for rate-constrained motion estimation is presented. The motion vectors are selected from a search window based on a rate-distortion criterion by successively el...
详细信息
A computationally efficient exhaustive search algorithm for rate-constrained motion estimation is presented. The motion vectors are selected from a search window based on a rate-distortion criterion by successively eliminating the search positions depending on the rate constraint. The performance of the proposed algorithm is identical to the performance of the rate-constrained full search algorithm, with considerable reduction in computation. The number of matching calculations decreases as the constraint imposed on the rate increases.
The diagnosis of faults in grid-connected photovoltaic (GCPV) systems is a challenging task due to their complex nature and the high similarity between faults. To address this issue, we propose a wrapper approach call...
详细信息
暂无评论