Amplifier arrangement
Analog display station apparatus and method of effecting telepho
Animated annunciator apparatus
Animated annunciator apparatus
Apparatus and method for canceling acoustic echoes including non
Apparatus and method for controlling a volume in a digital...
Apparatus and method for detecting far end speech
Apparatus and method for determining the presence and polarity o
Apparatus and method for dual mode phone
Apparatus and method for hands free telephonic communication
Apparatus and method for music production by at least two...
Apparatus and method for reducing local interference in...
Apparatus for accessing function code in telephone
Apparatus for and method of operating an automatic log on/log of
Apparatus for obtaining a high sound level and good sound reprod
Apparatus for reducing echoes and noises in telephone
Apparatus for ring-back constriction
Apparatus for the attachment of a computer to a telephone...
Apparatus in a loudspeaking telephone set for supplying power to
Architecture for telephone set