In this paper, parameter estimation of a two-dimensional (2-D) single damped real/complex tone in the presence additive white Gaussian noise is addressed. By utilizing rank-one property 2-D noise-free data matrix, damping factor and frequency for each dimension are estimated separable manner from principal left right singular vectors according to an iterative weighted least squares procedure. The remaining parameters then obtained straightforwardly using standard squares. biases as well...

Correction of frequency-dependent I/Q mismatches in quadrature receivers The wideband designed for multi-channel reception can be and limit their image rejection performance to an unacceptable level. An adaptive signal-image separation system is proposed correct the digital domain. Simulation results verifying method are given.

The problem of frequency estimation for noisy sinusoidal signals from multiple segments or channels, which are referred to as gapped data, is addressed. Based on linear prediction and weighted least squares techniques, an iterative relaxation-based estimator devised analyzed. proposed algorithm also extended harmonically related frequencies. Computer simulations conducted compare the performance developed approach with existing multichannel Crame¿r-Rao lower bound.

In this work, we present a model-based approach to enhance noisy speech using an analysis-synthesis framework. Target is reconstructed with model parameters estimated from observations. particular, spectral envelope by tracking its temporal trajectories in order improve the noise-distorted short-time amplitude. Initially, propose framework for enhancement based on harmonic noise (HNM). Acoustic such as pitch, envelope, and gain are extracted HNM analysis. Spectral estimation improved line...

Semicustom IC design methodologies often assume a wide range of operating conditions. This requirement makes designing output drivers very difficult, as ringing due to overdriving cannot be avoided. problem becomes more tricky when power noise simultaneous switching many at high speed is also considered. A new driver proposed that adopts an innovative feedback mechanism achieve adaptive characteristic so its performance will not vary under different loading The low in it works with principle...

In today's sub-micron CMOS integrated circuit technology, high speed output switching signals interacting with external inductance and capacitance produce noise which contaminates power buses. A Feedback Control Slew Rate Output Driver (FCSROD) reduces the spike down to approximately 64% of a conventional buffer without incurring penalty propagation delay even rise/fall time is described. This effective suppression achieved by using distributed weighted driver segments in conjunction...

This paper presents a technique to suppress the mismatch between in-phase (I) and quadrature-phase (Q) channels of switched-capacitor complex sigma-delta modulator that is used for analog-to-digital conversion real intermediate-frequency radio signal. The suppressed through time sharing critical capacitors, i.e., input sampling capacitor feedback digital-to-analog converter, I Q channels. Circuit simulations verifying proposed are presented.

This paper presents a speech enhancement method based on an analysis-synthesis framework using harmonic noise model (HNM) in car environment. The major advantages of this are effective suppression even very low signal-to-noise ratio environments and mitigation ldquomusical tonesrdquo which generally introduced by conventional methods. In paper, we devise complete system, give details HNM modeling, parameter estimation, adaptation. Subjective evaluation results show that the proposed exhibits...

This paper presents a design procedure of high-frequency output driver with low power-bus noise and an architecture which automatically adapts to different loading. In depth analysis amplitude versus driving power as first stage is included the theoretical approach supported by simulation measurement results designed manufactured device.

In this paper we present a block-based bandwidth extension system to enhance the quality of narrowband speech signal (0-4 kHz). memoryless systems, missing high-band components are estimated from using current frame only. As narrowband-to-wideband mapping is one-to-many problem, likely cause hissing and whistling artifacts in reproduced speech. Our method estimates via state sequence continuous density hidden Markov model (CDHMM) on block basis. The either one word or words utterance. CDHMM...

This paper describes a four-quadrant analog multiplier cell that can operate below one volt dc bias. new is specially designed for low voltage portable communication equipment. The consists of two translinear loops. We have operated this at as 0.8 V. With the exception operation, output current true product input currents, and there no limitation on dynamic range with conventional Gilbert cell.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>

Nowadays, there are many Cryptographic Applications that demand both high speed and low power. In order to meet this requirement, we have designed a new asynchronous Data Encryption Standard (DES) data encryption chip decided can be used in contactless smart cards. There advantages use Asynchronous Circuit Design card chips, such as power consumption no global clock. We will 0.6 /spl mu/m CMOS technology fabricate the RF test circuit.

This paper describes a configuration analysis of optical fiber interferometric hydrophones. We use mathematical methods to compare their characteristics and relation sensitivity, delay physical frequency the Sagnac type interferometer. In experiment, we PGC modulation technology measure sensitivity three types interferometer in this proposed. The preliminary results acoustic signal are as follows: Michelson, compensating Mach-Zehnder Hybrid -201.67, -205.97, -212.47 dB re V/1 /spl mu/Pa,...

Quadrature sampling of intermediate frequency (IF) signals is subject to the well-known problem gain and phase mismatches between in-phase (I) quadrature (Q) channels. This paper presents an IF-input quadrature-sampling switched-capacitor (SC) /spl Sigma//spl Delta/ modulator that circumvents I/Q mismatch by time-sharing I Q channels critical circuit components, namely, capacitor first-stage feedback digital-to-analog converter (DAC). In addition, a clocking scheme insensitive imbalance...

Waves arise in many physical phenomena which have applications such as describing the voltage along a transmission line and medical imaging modality of elastography. In this paper, estimating parameters for two forms lossy wave equations, correspond to multi-mode multi-dimensional waves, are tackled. By exploiting linear prediction property noise-free signals, an iterative quadratic maximum likelihood (IQML) approach is devised accurate parameter estimation. Simulation results show that...

A hand-printed Chinese character recognizer based on contextual vector quantization (CVQ) has been built. The idea of CVQ is to quantize each pixel a codeword by considering not just the itself but its neighbors and their identities as well. 100 samples are collected from writers, among them, 92 used for training 8 testing. characters scanned 300 dpi scanner, which then noise removed, thinned, segmented size normalized. Stroke counts segment strengths adopted observation features. For...

Results for improving the quality of narrowband CELP-coded speech by enhancing pitch periodicity and regenerating high-band components spectra are reported. Multiband excitation (MBE) analysis is applied to enhance re-synthesizing signal using a harmonic synthesizer. The magnitude regenerated matching low-band trained wideband spectral codebook. Information about voiced/unvoiced (V/UV) in derived from training procedure recovered matched index. Simulation results indicate that enhanced...

Smartcard is originally designed as a passive authentication device. Retaining this role will limit its potential and it eventually be superceded by other technologies. Therefore, must for smartcard to take the active in near future. In light of this, paper presents novel card-centric framework, which becomes master whereas card-connected terminal only slave. The system prototype based on current technologies shows reasonable results, another demo that makes use enhanced provides significant...

In this letter, a Two-Dimension Common Factor Decomposition (2D-CFD) algorithm is proposed to represent the 3D (time, azimuth and elevation) head-related impulse response (HRIR) dataset with two factorized matrices. One matrix made up of set common factor responses extracted from HRIRs same angle carries azimuthal information contained in original HRIR dataset. The other elevation similarly. By using dimension reduction, storage requirement reduced remarkably. addition, are further modeled...

The authors describe an improved pitch detection algorithm for efficient multiband excitation (MBE) coding of speech. adds a corrective measure to the error spectrum matching employed in conventional MBE analysis. This effectively applies equal weighting all harmonic bands by normalising energy each band. result is reduction gross errors owing doublings. An additional advantage using this that, because based on sum-of-product formula, comparisons scores may be performed with partial-sums...

A high quality harmonic+noise speech coder is presented. This operates in either the steady mode or transient mode. An efficient phase coding technique based on polynomial fitting proposed. In this technique, frequency deviations that are used to minimize prediction errors modeled by a 6/sup th/-order polynomial. The coefficients quantized closed-loop split vector quantizer. For speech, unvoiced part an 8/sup all-pole model while voiced low-frequency harmonic components. transitional...

In this paper, a method for improving the quality of narrowband CELP-coded speech is present. The approach to reduce hoarse voice in by enhancing pitch periodicity reproduction signal and also muffing characteristics regenerating highband components spectra from signal. proposed method, multiband excitation (MBE) analysis performed on CELP decoder enhanced resynthesizing using harmonic synthesizer according MBE model. magnitude are regenerated matching lowband trained wideband spectral...