Advanced Voice Communication with Acoustic Echocancelling and Enhanced Sound Quality

摘要

This paper initially considers speech coding according to CCITT-Rec.G.722,which allows an in creased audio bandwidth of 7 kHz at a data rate of 64_kbit/s in the 18DN.The problem of handsfree telephony will then be afforded special attention and a solution will be proposed utilising an acoustic echocanceller.The obiective was to develop a compact implementation of both algorithms,using digital signal processors,which also provides for optimal determination and control of system parameters.The results will be discussed and applications for future services will be presented.