Switching device for power supply to additional accessories for
System and method for controlling a filter to enhance...
System and method for low-power echo and NEXT cancellers
Systems and arrangements for controlling modes of audio...
Technique for compensating for signal attenuation on a telephone
Techniques for improving telephone audio quality
Teleconferencing device having acoustic transducers...
Telephone apparatus
Telephone apparatus with call transfer function and with improve
Telephone device
Telephone handset detector
Telephone having a speech ban limiting function
Telephone having automatic gain control means
Telephone having four VAD circuits
Telephone instrument
Telephone receiver transmitter device
Telephone set
Telephone set
Telephone set in which an echo signal is effectively cancelled i
Telephone set which can be adjusted in response to ambient noise