Abstract: An interface system for connecting various accessory devices to a radiotelephone and arbitrating between conflicting requests for access to the audio channel of the radio telephone by the accessory devices. Included is a controller for controlling operation of the interface system and a switch for connecting the audio channel of the selected accessory to the audio channel of the radiotelephone. A method is also provided for entering user selected operational settings for controlling operation of the interface system and prioritizing access to the radiotelephone.

Abstract: A telephone has a receiver, a transmitter, a control interface, an audio processor and a microprocessor. The audio processor includes a digital signal processor, an input audio unit coupled to a microphone, an output audio unit coupled to a speaker, and a ring signal controller coupled to a transducer/ringer. When an incoming call is received, the audio processor samples the microphone input signal, which is indicative of ambient noise, and performs a spectral analysis of the ambient noise. The audio processor then sets the ring frequency and the ring volume responsive to the ambient noise spectrum and the ring volume control level set by the user.