Acoustic signal transfer device
Acoustic transducer assembly
Acoustical echo canceller having an adaptive filter with passage
Acoustical echo canceller with sub-band filtering
Activating telephone-based services using a POS device
Activating telephone-based services using a POS device
Activation of a telephone's own call answering...
Activation of electronic lock using telecommunications network
Active audio compressing in telecommunication
Active decoupling and power management circuit for...
Active digit cancelling parallel dialer
Active dipole telephone line protection device
Active impedance line feed circuit
Active matrix substrate, method of manufacturing same, and...
Active matrix substrate, method of manufacturing same, and...
Active mode line voltage regulator for ringing subscriber...
Active mode line voltage regulator for ringing subscriber...
Active noise suppression system for telephone handsets and metho
Active prompts
Active strapping and switching device for telephone line testing