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Design and analysis of logarithmic digital quantizers with applications to low-power data interfaces for speech processing.

机译：对数数字量化器的设计和分析及其在低功耗数据接口上的应用，用于语音处理。

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摘要

raditionally, digital voice-band systems have employed either uniform, ;Moreover, it is shown that this approach results in performance quite similar to that exhibited by traditional compandors. Quantization noise characteristics for the case of a finite word length are derived. Also, the effects upon system performance when input signals possess a non-zero mean are presented. Performance degradation due to harmonic distortion, introduced by mismatches in the logarithm base among different subsystems, are quantified. Simple, power-efficient converters are then proposed based upon the switched-capacitor equivalent of a parallel RC network and factoring of the digital data. The effects of nonidealities in the active and passive components on coder performance are also established.;In order to demonstrate the usefulness of the proposed encoder-decoder, the design of an experimental Analog Interface Processor (AIP) for use in a Digital Hearing Aid (DHA) is described. This experimental prototype includes, in addition to the data conversion circuits, an anti-aliasing filter, a low-noise preamplifier, and several spectral shaping circuits. Finally, experimental data obtained from circuits fabricated in a standard 2
机译：传统上，数字语音频带系统采用统一的方法；此外，表明这种方法所产生的性能与传统压扩器所展现的性能非常相似。推导了有限字长情况下的量化噪声特性。此外，还介绍了输入信号具有非零均值时对系统性能的影响。量化了由谐波失真引起的性能下降，谐波失真是由不同子系统之间的对数基数不匹配导致的。然后，基于并行RC网络的等效开关电容器和数字数据的分解，提出了一种简单，高效的转换器。还建立了有源和无源组件中的非理想性对编码器性能的影响。;为了证明所提出的编码器-解码器的有用性，设计了一种用于数字助听器的实验模拟接口处理器（AIP）（ DHA）。除数据转换电路外，该实验原型还包括一个抗混叠滤波器，一个低噪声前置放大器和几个频谱整形电路。最后，从标准2中制造的电路获得的实验数据

著录项

  • 作者

    Engel, George Lawrence.;

  • 作者单位

    Washington University in St. Louis.;

  • 授予单位 Washington University in St. Louis.;
  • 学科 Electrical engineering.;Biomedical engineering.
  • 学位 D.Sc.
  • 年度 1990
  • 页码 195 p.
  • 总页数 195
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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