Transform-Domain and DSP Based Secure Speech Communication Simulation and experiments based research
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- Englisch ausgewählt
Fr. 105.00
inkl. gesetzl. MwSt.,
Beschreibung
Produktdetails
Einband
Taschenbuch
Erscheinungsdatum
05.09.2011
Verlag
LAP LAMBERT Academic PublishingSeitenzahl
252
Maße (L/B/H)
22/15/1.6 cm
Gewicht
393 g
Auflage
1. Auflage
Sprache
Englisch
ISBN
978-3-8454-4254-9
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 execution time from 299 msec to 140 msec. In respect of security, the newly introduced scheme yielded 0% residual intelligibility of the encrypted signal thereby rendering highest level of security.
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