The genuine RAVCpl64.exe file is a software component of Realtek High Definition Audio Driver by Realtek.
The Realtek HD Audio Driver is an interface between the Windows operating system and the Realtek HD Audio Card. RAVCpl64.exe runs the HD Audio Control Panel, a volume configuration tool. This is not an essential Windows process and can be disabled if known to create problems.
The Realtek HD Audio Driver is a software interface for Realtek HD Audio, an audio chipset that uses audio codecs and standards developed by Intel. Realtek HD Audio is a successor to their AC'97 PC audio standard. It was known as 'Azalia' during the development period. Most Intel motherboards contain sound chips from Realtek.
RAVCPl64 stands for Realtek Audio Volume Control Panel (64-bit)