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A Novel Technique for Detection of CVSD Encoded Bit Stream

Parthraj Tripathi, Dr.K.Padma Raju, V.Ravi Chandra

in tactical communication where the quality of signal is option for the secure transmission,Continuously Variable Slope Delta modulation(CVSD) codec is used which is very difficult to decodeif intercepted because of its adaptive nature and likewise its parameters.In communication systemswhere this codec is widely used, required a method to detect or identify the bitstream of this kind.in this paper we attempt to extend classifier algorithm[6] to identify CVSD codec by extracting 7 different parameters for each windowsize operation from the incoming unknown bit stream and compare with the thresholds are already calculated and stored in database.operations are performed on different slides 8,10,16,24 and 32 to extract total of 35 parameters,all these parameter values are added to previous already existing library[6].