Agere Systems Inc.

Nic Andrew Redshaw

Richard Verney

David J Bennetts

Richard Apsey

Anthony Robert Buckley

In a preferred embodiment, the invention is a mobile communication device having a digital signal processor (DSP), a speaker output node, a local audio source, and an analog front-end (AFE), wherein: (1) the DSP receives a first audio signal corresponding to sound captured by a microphone near a user of the device, (2) if the device is operating in a call mode, the DSP derives a background noise signal from the first audio signal, for subtraction from the first audio signal before transmission to the AFE, and (3) if the device is operating in a non-call mode, then the DSP (i) generates a speaker output signal which substantially corresponds to the first audio signal subtracted from a local audio signal provided by the local audio source and (ii) provides the speaker output signal to a speaker via the speaker output node.

Noise reduction by mobile communication devices in non-call situations

A mobile telecommunications system has a handset and a headset for connection to the handset. The handset includes an RF transceiver for transmitting an outgoing call and receiving an incoming call, and a processor coupled to the RF transceiver that provides audio signals on a first audio path to an audio transducer in the handset and on a second audio path for an audio transducer in the headsets. The headset and handset include respective button switches arranged that the operation has the effect both of initiating and/or accepting a call, and of routing audio signals to the respective first or second audio paths. Embodiments are described including a separate switch for toggling the audio paths, and automatic sensors for detecting use of the headset or handset.

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Windsor, United Kingdom

Nic Andrew Redshaw