Communication apparatus with ambient noise reduction
AssigneeCirrus Logic International Semiconductor Ltd.
InventorAlastair Sibbald
Life of this patent
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Abstract
Noise reduction circuitry for a communication apparatus can apply different noise reduction transfer functions, depending on whether a listening device is connected to the apparatus. If no listening device is connected, the noise reduction transfer function can be adapted for use with microphones and speakers that form an integral part of the communication apparatus, which may be a cellular telephone. If a listening device is connected, the noise reduction transfer function can be adapted for use with microphones and speakers that form a part of the listening device. This allows the noise reduction circuitry to provide improved noise reduction performance.
Claims9
A listening system, comprising:
- a handset, comprising at least one first microphone and at least one first loudspeaker;
- and
- a listening device, comprising at least one second microphone and at least one second loudspeaker;
- wherein the listening device may be connected to the handset by means of a short-range wireless connection,
- wherein the handset comprises noise reduction circuitry,
- wherein the noise reduction circuitry is adapted to generate a first noise cancellation signal by applying a first noise reduction transfer function to an input signal received from the first microphone, and to output the first noise cancellation signal to the at least one first loudspeaker, and
- wherein the noise reduction circuitry is adapted to generate a second noise cancellation signal by applying a second noise reduction transfer function to an input signal received from the second microphone, and to output the second noise cancellation signal to the at least one second loudspeaker.
Dependencies are inferred from the claim text.