Abstract: A method of increasing the terminal coupling loss in a digital half-duplex handsfree terminal is provided. When the terminal receive channel is active an idle code which is effectively zero is transmitted by an idle code generator. When the terminal transmit channel is active a normal speech signal is transmitted. To determine which channel is active, a receive speech signal level is measured at the receive channel input, and a "virtual" transmit speech signal is computed from a signal in the transmit channel before the idle code generator.

Abstract: A system for notifying users of digital wireless communications that a mobile unit is moving out of range and communication is about to be lost. The system inserts an audible indication as the received signal strength varies. The audible indication can be in the form of noise which is inserted in such a manner that a digital mobile unit mimics the behavior of an analog mobile unit which is moving out of range, in order to provide a readily identifiable indication to the user that the wireless handset is about to go out of range. Such a system can be used to indicate to both users of wireless units, and to telephone users which are in communication with wireless units, that communication is about to be lost.