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Chapter 15

Designing for Speech Intelligibility

by Don Davis

15.1 Introduction

The Talker or Performer

The Electronics System

The Loudspeaker System

The Acoustic Environment

The Receiver-Listener

15.2 Articulation Losses of Consonants in Speech

Prediction, Measurements, and Anomalies

Calculating %AL_CONS

Usable Percentages

15.3 Maxfield’s Equation

15.4 Speech Power and Articulation

15.5 Signal-to-Noise Ratio (SNR)

15.6 Speech Intelligibility Calculations

Calculating the Minimum Q

Calculation of the Maximum RT₆₀

Factors Affecting %AL_CONS

Measuring Intelligibility

Evaluating Speech Intelligibility Measurements

Causes of Reduced Intelligibility

15.7 Non-Acoustic Articulation Problems

15.8 Relationship Between Q_MIN

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