Digital Speech Transmission

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The advancements in digital signal processing (DSP) technology have significantly enhanced the effectiveness of speech communication devices, including GSM and UMTS mobile phones, digital hearing aids, and human-machine interfaces. Digital speech transmission techniques are crucial for maintaining high-quality communication in current and future networks. Enhancement, coding, and error concealment techniques improve speech signals throughout the transmission process, from the acoustic front-end to sound reproduction at the receiver. Advanced algorithms address various limitations such as background noise, bandwidth restrictions, and transmission errors. This comprehensive guide covers fundamental issues, algorithms, standards, and trends in speech signal processing and communication technology. Key topics include fundamentals of speech signal processing, speech coding with new coders for GSM and UMTS, soft decoding for error concealment, artificial bandwidth extension, single and multi-channel noise reduction, and acoustic echo cancellation. This resource is essential for engineers, researchers, academics, and graduate students in communications, electrical engineering, and information technology.