Improvised method for analysis and synthesis of NUFB for Speech and ECG signal applications

IF 3 4区 计算机科学 Q2 COMPUTER SCIENCE, INFORMATION SYSTEMS
B. Keerthana, N. Raju
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引用次数: 0

Abstract

This article presents a rapidly converging optimization technique using a single parameter for designing non-uniform cosine modulated filter banks (CMFBS). The non-uniform cosine modulated filter banks are derived from closed-form uniform cosine modulated filter banks by merging the relevant bandpass filters based on given decimation factors. In this proposed method, the cut-off frequency of the prototype filter is varied through analytically calculated step size using control parameters so that the filter coefficients at quadrature frequency are approximately equal to 0.707 and the formulated objective function is satisfied with the prescribed tolerance. Simulation results demonstrate that the proposed algorithm achieves superior performance, with amplitude distortion levels significantly outperforming existing methods in the literature, reaching as low as 2.4483 × 10⁻4. For the prototype filter design, a constrained equiripple finite impulse response (FIR) digital filter is employed, with the roll-off factor and error ratio chosen based on a stopband attenuation, a passband attenuation and a filter order. The results highlight the proposed algorithm’s effectiveness for high-quality reconstruction of speech signals, particularly in speech coding and enhancement, as well as ECG signals. This makes the method highly versatile and suitable for various practical applications, including sub-band coding of real-time and near real-time signals.

Abstract Image

用于语音和心电信号的 NUFB 分析与合成改进方法
本文提出了一种快速收敛的优化技术,使用单一参数设计非均匀余弦调制滤波器组(CMFBS)。非均匀余弦调制滤波器组是从闭式均匀余弦调制滤波器组衍生而来的,方法是根据给定的抽取系数合并相关的带通滤波器。在所提出的方法中,原型滤波器的截止频率通过使用控制参数分析计算的步长来改变,从而使正交频率下的滤波器系数近似等于 0.707,并在规定的容差范围内满足所制定的目标函数。仿真结果表明,所提出的算法性能优越,振幅失真水平明显优于文献中的现有方法,最低可达 2.4483 × 10-4。在滤波器原型设计中,采用了受约束等褶有限脉冲响应(FIR)数字滤波器,根据阻带衰减、通带衰减和滤波器阶数选择滚降系数和误差比。结果表明,所提出的算法能有效地对语音信号(尤其是语音编码和增强)以及心电信号进行高质量的重建。这使得该方法具有很强的通用性,适用于各种实际应用,包括实时和近实时信号的子带编码。
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来源期刊
Multimedia Tools and Applications
Multimedia Tools and Applications 工程技术-工程:电子与电气
CiteScore
7.20
自引率
16.70%
发文量
2439
审稿时长
9.2 months
期刊介绍: Multimedia Tools and Applications publishes original research articles on multimedia development and system support tools as well as case studies of multimedia applications. It also features experimental and survey articles. The journal is intended for academics, practitioners, scientists and engineers who are involved in multimedia system research, design and applications. All papers are peer reviewed. Specific areas of interest include: - Multimedia Tools: - Multimedia Applications: - Prototype multimedia systems and platforms
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