数字动态范围压缩原理。
Principles of digital dynamic-range compression.
作者信息
Kates James M
机构信息
Department of Speech Lang. Hearing Sciences, Boulder, CO 80309, USA.
出版信息
Trends Amplif. 2005;9(2):45-76. doi: 10.1177/108471380500900202.
Abstract
This article provides an overview of dynamic-range compression in digital hearing aids. Digital technology is becoming increasingly common in hearing aids, particularly because of the processing flexibility it offers and the opportunity to create more-effective devices. The focus of the paper is on the algorithms used to build digital compression systems. Of the various approaches that can be used to design a digital hearing aid, this paper considers broadband compression, multi-channel filter banks, a frequency-domain compressor using the FFT, the side-branch design that separates the filtering operation from the frequency analysis, and the frequency-warped version of the side-branch approach that modifies the analysis frequency spacing to more closely match auditory perception. Examples of the compressor frequency resolution, group delay, and compression behavior are provided for the different design approaches.
摘要
本文概述了数字助听器中的动态范围压缩。数字技术在助听器中越来越普遍，特别是因为它提供了处理灵活性以及创造更有效设备的机会。本文的重点是用于构建数字压缩系统的算法。在可用于设计数字助听器的各种方法中，本文考虑了宽带压缩、多通道滤波器组、使用快速傅里叶变换（FFT）的频域压缩器、将滤波操作与频率分析分开的侧分支设计，以及修改分析频率间距以更紧密匹配听觉感知的侧分支方法的频率扭曲版本。针对不同的设计方法，提供了压缩器频率分辨率、群延迟和压缩行为的示例。
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