Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Anthropomorphic Coding of Speech and Audio: A Model Inversion Approach | EURASIP Journal on Applied Signal Processing 2005 9 1334-1349 2005 Christian Feldbauer et al. Anthropomorphic Coding of Speech and Audio A Model Inversion Approach Christian Feldbauer Signal Processing and Speech Communication Laboratory Graz University of Technology 8010 Graz Austria Email feldbauer@ Gernot Kubin Signal Processing and Speech Communication Laboratory Graz University of Technology 8010 Graz Austria Email W. Bastiaan Kleijn Department for Signals Sensors and Systems KTH Royal Institute of Technology 10044 Stockholm Sweden Email Received 14 November 2003 Revised 25 August 2004 Auditory modeling is a well-established methodology that provides insight into human perception and that facilitates the extraction of signal features that are most relevant to the listener. The aim of this paper is to provide a tutorial on perceptual speech and audio coding using an invertible auditory model. In this approach the audio signal is converted into an auditory representation using an invertible auditory model. The auditory representation is quantized and coded. Upon decoding it is then transformed back into the acoustic domain. This transformation converts a complex distortion criterion into a simple one thus facilitating quantization with low complexity. We briefly review past work on auditory models and describe in more detail the components of our invertible model and its inversion procedure that is the method to reconstruct the signal from the output of the auditory model. We summarize attempts to use the auditory representation for low-bit-rate coding. Our approach also allows the exploitation of the inherent redundancy of the human auditory system for the purpose of multiple description joint source-channel coding. Keywords and phrases speech and audio coding auditory representation auditory model inversion auditory synthesis perceptual domain coding multiple description coding. 1. INTRODUCTION . .
