DIGITAL DESIGN AND SIMULATION OF CVSD CODEC ALGORITHM USING VHDL

Amrita Soni, Piyush Gupta

Abstract: Generally, digital signal transmission systems have important advantages over analog counterparts because noise dose not built up in cascading of repeaters. There is various digital transmission techniques like PCM, DM, DPCM, ADM etc. In this DM and ADM provides minimum transmission Bandwidth. DM provides slope overload error and granular noise in transmission so variation of step size is needed, which is provided by ADM. There is various algorithms in ADM technique like SONG algorithm, ABATE algorithm etc. one of the algorithm 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 digital design of CVSD codec system using VHDL and simulation result is obtained at various data rates.

Keywords: CVSD, DM, PCM, FPGA, ASIC, VHDL, BW, SIPO, PIPO, Verilog, RTL.

DOI: https://doi.org/10.15623/ijret.2017.0605015