Brief Introduction about VHDL Implementation of CVSD Codec

Abstract

In order for the signal to have good quality, the slope-overload error desires to be as small as possible. Adaptive delta modulation reduces the slope over load error to a greater extent. One of the algorithms of ADM is CVSD algorithm. CVSD (continuous variable slope delta) modulation is an effective scheme for audio signal. CVSD is best coding technique for improving receiver sensitivity with low transmission rate as compare to PCM. Here in this paper, we discuss the implementation of CVSD codec system using VHDL (Very High Speed Integrated Circuit Hardware Description Language). VHDL provides structure to be modelled and simulated before synthesis tools (XST tools). It allows the description of a concurrent system. It is portable and multipurpose. These paper is also describes the various RTL schematic of each module of the CVSD codec and the connections of all RTL blocks in Top level design.