NTi Audio
LESS NOISE. MORE SOUND

Publications

2014, 九月

扩声系统语言传输指数 STIPA 论述

语音的清晰度程度是音质评价的重要指标,其可以反映厅堂或扩声系统的声音传输质量,是评价语言传输系统工作质量的重要参考量。人们可以通过实验的方法来测量,也可以借助传输系统的物理特性来预测。本文介绍了语言的清晰度指标的由来,相关标准与重要性,测试方法,测试原理以及测量结果的评价。

作者:咸爱清
《电声技术》2014年第 38 卷 第 8 期
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2013, October

End-of-line Test concepts to achieve and maintain yield and quality in high volume loudspeaker production

Managing high volume, multiple line and location loudspeaker production is a challenging task that requires interdisciplinary skills. This paper offers concepts for designing and maintaining end-of-line test systems that help to achieve and maintain consistent yield and quality. Topics covered include acoustic and electrical test parameter selection, mechanical test jig design, limit finding strategies, fault-tolerant workflow creation, test system calibration and environmental influence handling as well as utilizing statistics and statistic process control.

Author: Schmidle, Gregor
AES Paper Number 8990




2012, October

Overview and Comparison of and Guide to Audio Measurement Methods

Modern audio analyzers offer a large number of measurement functions using various measurement methods. This paper categorizes measurement methods from several perspectives. The underlying signal processing concepts, as well as strengths and weaknesses of the most popular methods are listed and assessed for various aspects. The reader is offered guidance for choosing the optimal measurement method based on the specific requirements and application.

Authors: Schmidle, Gregor; Zanatta, Danilo
AES Paper Number 8705




2011, October

A Systematic Approach to Measurement Limit Definitions in Loudspeaker Production

A typical end-of-line loudspeaker test comprises ten or more different parameters tested. Each parameter has its own pass/fail limits contributing to the overall test result of the loudspeaker and therefore to the yield of the production line. This paper gives a comprehensive overview about commonly used limit calculation methods and procedures in the industry. It also delivers systematic guidance for choosing the right limit scheme for maximizing yield, quality and throughput.

Author: Schmidle, Gregor
AES Paper Number 8472




2010, November

A Reliable Procedure for Polarity Measurements on Line Arrays

The performance of a line array strongly depends on the correct installation of its loudspeakers. For instance, a single speaker with incorrect polarity may clearly compromise the sound level and directivity of the whole system. The identification of such errors however can be very time consuming. Therefore, it is desirable to have a fast, yet reliable procedure to finding such array elements. This paper presents a step-by-step method to check the integrity of a line array, and to find the cause in case of a polarity problem. Besides the theoretical background, a successful practical case is described.

Authors: Becker, Markus; Schmidle, Gregor
AES Paper Number 8156




2009, October

Design Optimizations for a High Performance Handheld Audio Analyzer

All types of advanced mobile devices share certain design challenges. For example, they must incorporate a powerful-enough embedded processor system to support a full featured easy-to-use human interface at low power consumption. But designing a multi-function handheld audio analyzer then adds even more unique challenges based upon further professional requirements. These include extremely low measurement noise floor, safely and precisely handle wide voltage measurement range (absolute and dynamic), compatibility with measurement microphones and other input sources, adherence to a wide variety of necessary international and industry standards for measurement. Additional requirements include the efficient display of complex data onto a restricted size display, and efficient and safe operation in many different locations and physical environments. These place further design burdens on the user interface and the instrument package, respectively.

Author: Becker, Markus
AES Paper Number 7908