Effect of Power Amplifier Distortion on the Speech Transmission Index for Public Address Systems

IF 0.6 4区物理与天体物理 Q4 ACOUSTICS

Archives of Acoustics Pub Date : 2023-07-20 DOI:10.24425/aoa.2022.141649

P. Dziechcinski

引用次数: 0

Abstract

The eﬀect of the power ampliﬁer on speech intelligibility in public address systems is often marginalised – i.e. it is assumed that it does not introduce signiﬁcant signal distortion. This approach is justiﬁed when the linear range of the ampliﬁer is used. The large crest factor of the speech signal and economic considerations mean that the ampliﬁer also works in the non-linear range. In this paper, the eﬀect of power ampliﬁer distortion on the speech transmission index for public address systems (STIPA) is presented. In the ﬁrst step, this inﬂuence was evaluated by measurements for Class AB and D ampliﬁers. Then, a computer model of the public address system based on the direct STIPA method, taking into account the non-linear properties of the ampliﬁer, was proposed. Using the computer model, the optimum ampliﬁer driving values were determined taking into account the reverberation time and interfering noise.

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功率放大器失真对公共广播系统语音传输指标的影响

在公共广播系统中，功率放大器对语音清晰度的影响往往被边缘化，即假设它不会引入显著的信号失真。当使用放大器的线性范围时，这种方法是正确的。语音信号的大峰值因子和经济考虑意味着放大器也在非线性范围内工作。本文介绍了功率放大器失真对公共广播系统（STIPA）语音传输指标的影响。在第一步中，通过AB类和D类放大器的测量来评估这种影响。然后，考虑到放大器的非线性特性，提出了一个基于直接STIPA方法的公共广播系统的计算机模型。使用计算机模型，在考虑混响时间和干扰噪声的情况下，确定了最佳放大器驱动值。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Archives of Acoustics 物理-声学

CiteScore

1.80

自引率

11.10%

发文量

审稿时长

6-12 weeks

期刊介绍： Archives of Acoustics, the peer-reviewed quarterly journal publishes original research papers from all areas of acoustics like: acoustical measurements and instrumentation, acoustics of musics, acousto-optics, architectural, building and environmental acoustics, bioacoustics, electroacoustics, linear and nonlinear acoustics, noise and vibration, physical and chemical effects of sound, physiological acoustics, psychoacoustics, quantum acoustics, speech processing and communication systems, speech production and perception, transducers, ultrasonics, underwater acoustics.