Signal processing - Digital techniques

VoIP voice and fax signal processing by: Nagireddi, Sivannarayana (Electronic resources)

The digital signal processing handbook. Wireless, networking, radar, sensor array processing, and nonlinear signal processing by: Madisetti, V. (Electronic resources)

Digital Signal Processing by: Salivahanan, S; Gnanapriya, C; Vallavaraj, A (Electronic resources)