Telephoning and hands-free speech for cordless final apparatus with echo compensation

摘要

A process for operating a cordless TC final apparatus with a device for compensating acoustic echoes between loudspeaker and microphone comprises the following steps: a) defining various operating situations (Bi) of the TC final apparatus; (b) detecting sets of parameters (Pi) for compensating acoustic echoes for every operating situation (Bi) and storing them in a memory unit to which the TC final apparatus has access; (c) selecting the current operating situation (Bj) after switching on the TC final apparatus or in the event of a change in the operating situation; (d) loading the set of parameters (Pj) pertaining to the current operating situation (Bj) from the memory unit into the device for compensating acoustic echoes and carrying out the echo compensation with the loaded set of parameters (Pj) as a start value. The speech quality may be considerably improved thereby. In particular, a rapid adaptation to the instantaneous speech or operating situation can be made and therefore the function of hands-free speech can be executed more efficiently and reliably. The process also contributes to avoidance of feedback whistling and reverberation and to making a full-duplex process and a reduced noise level possible.