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Signal Processing Letters, IEEE

Issue 10 • Date Oct. 2004

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Displaying Results 1 - 22 of 22
  • Table of contents

    Publication Year: 2004 , Page(s): c1 - c4
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  • IEEE Signal Processing Letters publication information

    Publication Year: 2004 , Page(s): c2
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  • Adaptively combined LMS and logistic equalizers

    Publication Year: 2004 , Page(s): 777 - 779
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (120 KB) |  | HTML iconHTML  

    An adaptive, convex linear combination of the outputs of a standard least mean square (LMS) equalizer and a sigmoidal equalizer is proposed. This procedure results in improving the speed of the LMS equalizer while retaining the low steady-state error of the sigmoidal filter. Appropriate adaption schemes for both of the filters and for the combination parameters are established. Simulations of prac... View full abstract»

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  • Optimal error protection for real-time image and video transmission

    Publication Year: 2004 , Page(s): 780 - 783
    Cited by:  Papers (9)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (144 KB) |  | HTML iconHTML  

    In this letter, a novel and computationally inexpensive analytic mean square error (mse) distortion rate (D-R) estimator for SPIHT which generates a nearly exact D-R function for the two- and three-dimensional SPIHT algorithm is presented. Utilizing our D-R estimate, we employ unequal error protection and equal error protection in order to minimize the end to end MSE distortion of the transform do... View full abstract»

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  • State-space formulation of frequency transformation for 2-D digital filters

    Publication Year: 2004 , Page(s): 784 - 787
    Cited by:  Papers (6)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (160 KB) |  | HTML iconHTML  

    This letter proposes frequency transformation for two-dimensional (2-D) digital filters in terms of the state-space equations. In order to derive the 2-D state-space formulation of the frequency transformation, we extend Mullis and Roberts' state-space formulation of one-dimensional frequency transformation to 2-D case. The proposed frequency transformation is very suitable for state-space analysi... View full abstract»

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  • Closed-form design of all-pass fractional delay filters

    Publication Year: 2004 , Page(s): 788 - 791
    Cited by:  Papers (16)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (168 KB) |  | HTML iconHTML  

    In this letter, we propose a novel all-pass (AP) fractional delay filter whose denominator polynomial is obtained by truncating the power series of a certain function. This function is derived from the frequency response of the denominator whose magnitude response is related to the desired phase response through the Hilbert transform since the denominator of a stable AP filter is of minimum phase.... View full abstract»

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  • A new derivation of the adaptive matched filter

    Publication Year: 2004 , Page(s): 792 - 793
    Cited by:  Papers (18)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (81 KB) |  | HTML iconHTML  

    This paper deals with the problem of detecting a signal known up to a scaling factor in the presence of Gaussian disturbance with unknown covariance matrix. We propose a novel derivation of the adaptive matched filter (AMF) previously designed in a previous paper by Robey et al.. Precisely, we show that the Wald test for the problem at hand coincides with the AMF. View full abstract»

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  • On information criteria and the generalized likelihood ratio test of model order selection

    Publication Year: 2004 , Page(s): 794 - 797
    Cited by:  Papers (16)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (176 KB) |  | HTML iconHTML  

    The information criterion (IC) rule and the generalized likelihood ratio test (GLRT) have been usually considered to be two rather different approaches to model order selection. However, we show here that a natural implementation of the GLRT is, in fact, equivalent to the IC rule. A consequence of this equivalence is that a specific IC rule, such as Akaike IC or Bayesian IC, can be viewed as a mor... View full abstract»

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  • A multiresolution nonparametric regression for spatially adaptive image de-noising

    Publication Year: 2004 , Page(s): 798 - 801
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (472 KB) |  | HTML iconHTML  

    Recently, new efficient algorithms, based on Lepski's approach , have been proposed for spatially adaptive varying scale de-noising. Special statistical rules are exploited in order to select the estimate with the best point-wise varying scale h from a set of test-estimates yˆh(x),h∈H. In this paper, a novel multiresolution (MR) nonparametric regression technique is developed.... View full abstract»

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  • Modeling correlation of quantized noise and periodic signals

    Publication Year: 2004 , Page(s): 802 - 805
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (168 KB) |  | HTML iconHTML  

    A model for determining the cross-correlation function of partially correlated noise is presented. In this model a strong interferer is included and represented by a periodic signal common to both channels of the correlator. A general expression for the correlation function is deduced and verified. The power spectrum of a calculated correlation function is compared with a simulation. The results p... View full abstract»

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  • Progressive medical image transmission and compression

    Publication Year: 2004 , Page(s): 806 - 809
    Cited by:  Papers (2)  |  Patents (2)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (944 KB) |  | HTML iconHTML  

    Digital radiology places very high demands on the networking and digital storage infrastructure of hospitals. In addition to having quite stringent requirements on the quality of the images displayed to the radiologist, much of the technical challenge resides in the necessity of displaying desired images as rapidly as possible. We present an infrastructure for progressive transmission and compress... View full abstract»

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  • Phase discontinuity-free sampling timing control for IF sampling receiver

    Publication Year: 2004 , Page(s): 810 - 812
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (120 KB) |  | HTML iconHTML  

    The effect of changing sampling timing in intermediate frequency (IF) sampling receivers is analyzed for the case when symbol timing recovery is performed by controlling the IF sampling clock. We note that changing the sampling timing in IF sampling causes a phase discontinuity which is detrimental to the stable operation of the phase recovery loop. We propose a new IF sampling scheme which makes ... View full abstract»

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  • Synthesis of two-dimensional pseudo white-noise signal with low peak factor

    Publication Year: 2004 , Page(s): 813 - 816
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (168 KB) |  | HTML iconHTML  

    This letter presents a new systematic approach for generating two-dimensional (2-D) signals having both a low peak factor (crest factor) and a flat power spectrum. The flat power spectrum provides zero auto-correlation, except for the zero shift. The proposed synthesis method is a systematic scheme, not a search method, and produces a 2-D signal of size (2n1+1)(4n1+1)×(... View full abstract»

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  • A note on argument principle

    Publication Year: 2004 , Page(s): 817 - 820
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (176 KB) |  | HTML iconHTML  

    The goal of this work is to show how the argument principle together with discrete Fourier transform (DFT) can be used to determine some properties of finite-length complex-valued sequences, precisely the localization of zeros with respect to unit circle of their related Z-transform. An upper bound of the DFT (in one step) length to exactly calculate the increase of the argument is also provided. View full abstract»

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  • On-line signal processing using J-DSP

    Publication Year: 2004 , Page(s): 821 - 825
    Cited by:  Papers (10)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (328 KB) |  | HTML iconHTML  

    The Java-DSP (J-DSP) on-line laboratory software has been developed from the ground up at Arizona State University to support the computer lab portion of the senior-level DSP course. J-DSP provides capabilities for web-based DSP simulations that can be run using a PC with a Java-enabled browser. J-DSP is accompanied by exercises that actively engage students in several concepts including Z-transfo... View full abstract»

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  • Robust digital watermarking in the ridgelet domain

    Publication Year: 2004 , Page(s): 826 - 830
    Cited by:  Papers (24)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (232 KB) |  | HTML iconHTML  

    In this letter, we propose a multiplicative watermarking method operating in the ridgelet domain. We employ the directional sensitivity and the anisotropy of the ridgelet transform (RT) in order to obtain a sparse image representation, where the most significant coefficients represent the most energetic direction of an image with straight edges. Therefore, given a natural image, the associated edg... View full abstract»

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  • Collusion-resilient fingerprinting by random pre-warping

    Publication Year: 2004 , Page(s): 831 - 835
    Cited by:  Papers (12)  |  Patents (3)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1448 KB) |  | HTML iconHTML  

    Fingerprinting of audio-visual content using digital watermarks is an effective means of determining originators of unauthorized/pirated copies. Watermarks embedded in content can trace the traitor responsible for piracy. Multiple users may, however, collude and collectively escape identification by creating an average of their individually watermarked copies that appears unwatermarked. We propose... View full abstract»

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  • Scalable video transmission over wireless DS-CDMA channels using minimum TSC spreading codes

    Publication Year: 2004 , Page(s): 836 - 840
    Cited by:  Papers (9)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (248 KB) |  | HTML iconHTML  

    In this letter, we report results on the relative performance of scalable video transmission via a single-rate or a multirate direct sequence code-division multiple-access channel using minimum total squared correlation spreading codes. Our findings demonstrate the superiority of the multirate system on a wide range of chip rates of practical interest. View full abstract»

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  • The performance of the GLRT for the spatial signals detection with a small number of observations

    Publication Year: 2004 , Page(s): 841 - 844
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (184 KB) |  | HTML iconHTML  

    In this letter, the generalized likelihood ratio test (GLRT) is used for the detection of multidimensional Gaussian complex signals with unknown spatial covariance matrix on a background of additive Gaussian complex noise of a unknown power is solved. The exact analytical expressions for test-statistical moments were found for any numbers of observations. The expansion in a series of probability d... View full abstract»

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  • Element directivity compensation for beamforming a curved array

    Publication Year: 2004 , Page(s): 845 - 848
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (144 KB) |  | HTML iconHTML  

    Conventional delay-and-sum beamforming employs element shading weights that are derived from linear aperture approximations. For many conformal arrays, the aperture of interest is not well approximated by the linear assumption. In this letter, an analytical method for approximating desired linear array beampattern characteristics on a conformal array is presented. The advantage of the method is th... View full abstract»

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  • A cue for objective speech quality estimation in temporal envelope representations

    Publication Year: 2004 , Page(s): 849 - 852
    Cited by:  Papers (7)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (184 KB) |  | HTML iconHTML  

    In this paper, we investigate a new paradigm of objective speech quality estimation. The proposed nonintrusive method utilizes only processed speech signal, whereas conventional objective models require source speech applied as an input to the system under test, as well as the processed speech. The proposed method is based on the temporal envelope representation of speech, which reflects the perce... View full abstract»

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  • IEEE Signal Processing Society Information

    Publication Year: 2004 , Page(s): c3
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    Freely Available from IEEE

Aims & Scope

The IEEE Signal Processing Letters is a monthly, archival publication designed to provide rapid dissemination of original, cutting-edge ideas and timely, significant contributions in signal, image, speech, language and audio processing.

Full Aims & Scope

Meet Our Editors

Editor-in-Chief
Peter Willett
University of Connecticut
Storrs, CT 06269
peter.willett@uconn.edu