Digital Hearing Aids

摘要: Preface Hearing-Aid Technology Types of Hearing Aids From Analog to Digital Circuit Components Batteries Concluding Remarks References Signal Processing Basics and System Properties Discrete Fourier Transform Filters Filter Banks Block Concerns The Electroacoustic Aid Head Ear Microphone Receiver Vent Acoustics Occlusion Effect Directional Microphones Response Patterns Frequency Magnitude Mismatch Interaction with Vents Noise on the Performance Indices Rooms Reverberation Benefit in Real World Adaptive Multi-Microphone Arrays Two-Microphone Array Delay-And-Sum Beamforming Superdirective Widely-Spaced Benefits Wind Turbulence Measurements Characteristics Wind-Noise Reduction Feedback Cancellation Gain-Reduction Solutions Limitations Dynamic-Range Compression Does Help? Algorithm Design Single-Channel Multi-Channel Frequency-Domain Warping Single-Microphone Suppression Speech Signals Low-Level Expansion Envelope Valley Tracking Bandwidth Modulation Spectral Subtraction Estimation Wiener Effectiveness Contrast Enhancement Auditory Damaged Cochlea Modification Excess Upward Spread Masking F2/F1 Ratio Comparison Combining Sound Classification Rationale for Features Feature Selection Classifier Algorithms Examples Binaural "Cocktail Party" Problem Transmission Dichotic Band Splitting Index