Continuously Variable Slope Delta modulation is a voice coding method. It is a delta modulation with variable step size (adaptive delta modulation), first proposed by Greefkes and Riemens in 1970
WAV is an audio file that is associated with Microsoft Windows. It is the default audio format for Windows. But it supports almost all the Operating Systems. WAV files are comparatively larger than MP3 files. It is mostly used to create music files in audio cd. It can save music files at different bit rates.