Год выпуска: 2011 Автор: Jameel Ahmed Издательство: LAP Lambert Academic Publishing Страниц: 252 ISBN: 9783845442549
Описание
Secure speech communication has been of great significance in civil, commercial and particularly in military communication systems. Speech scramblers play a major role in these systems. Transform-domain, specially, DCT (Discrete Cosine Transform) based encryption of speech signals has often been a preferable choice for researchers. In such systems, besides security, removal of redundant information and execution speed of the algorithms have also been main focus of research and exploration. In this book, these three attributes, redundancy, speed and security are envisaged by exploiting ITU-T G.723.1 speech codec, Texas Instruments’ 32-bit floating-point DSP TMS320C6711 and a newly developed DCT based algorithm using sub-framing and lookup table respectively. The vigorous results show that the original signal is compressed more than 90%, which helps in the removal of redundant information. To enhance the execution speed, G.723.1 codec is optimized on advanced level thereby reducing...
