Comparative Study of Audio and Video Chat Application Over the Internet

Study and analysis of popular VoIP (voice/video- over-Internet protocol) applications (apps) on android smart- phone under the same bandwidth has been done. Out of these three popular apps (Skype, Imo & Google Duo), Skype is most popular VoIP applications where as Google Duo has been recently launched by Google last year in august. Also, in this paper a new android VoIP application has been developed with the implementation of adaptive filter. The traffic is captured with tcpdump and analyzed with tools (Wireshark & SteelCentral Packet Analyzer). Skype is based on closed source and is a proprietary project whereas Google Duo, Imo, and developed application are based on WebRTC (an open source project maintained by Google Chrome team). The results indicates that Google Duo voice/video quality is best among the apps whereas Imo having the worst voice/video quality. In this research it is found that most of the variation in voice/video quality arises due to noise in the form of echo in the signal. Therefore, to deal with the noise and echo adaptive filtering algorithm need to be used to enhance the existing voice/video quality. Normalized Least Mean Square (NLMS) is used in the developed application to deal with noise and enhancement of VoIP calls. Developed application when tested and compared with popular apps it shows good quality VoIP call than IMO application that suffer significant packet loss.