Multi-microphone correlation-based processing for robust automatic speech recognition
Thomas M. Sullivan · 1996
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Chapter 1. Introduction . . . . . . . . . . . . . . . . . . . . . 8 1.1. The Cross-Condition Problem . . . . . . . . . . . . . . . . . . . . 8 1.2. Thesis Statement . . . . . . . . . . . . . . . . . . . . . . . . 10 1.3. Thesis Overview . . . . . . . . . . . . . . . . . . . . . . . . 10 Chapter 2. Background . . . . . . . . . . . . . . . . . . . . .12 2.1. Delay-and-Sum Beamforming . . . . . . . . . . . . . . . . . . . 12 2.1.1. Application of Delay-and-Sum Processing to Speech Recognition . . 13 2.2. Traditional Adaptive Arrays . . . . . . . . . . . . . . . . . . . . 13 2.2.1. Adaptive Noise Cancelling . . . . . . . . . . . . . . . . . . 15 2.2.2. Application of Traditional Adaptive Methods to Speech Recognition . 16 2.3. Cross-Correlation Based Arrays . . . . . . . . . . . . . . . . . . 18 2.3.1. Phenomena . . . . . . . . ....