Communication apparatus with ambient noise reduction
AssigneeCirrus Logic, Inc.
InventorAlastair Sibbald
Life of this patent
Estimating the term…
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.
Claims19
A listening system, comprising:
- an apparatus;
- and
- a listening device, comprising at least one first microphone and at least one first loudspeaker;
- wherein the listening device may be connected to the apparatus by means of a short-range wireless connection, such that the loudspeaker of the listening device can play sounds in response to signals generated in the apparatus;
- wherein the system comprises noise reduction circuitry configured for generating a noise cancellation signal by applying a noise reduction transfer function to a signal generated by the microphone of the listening device,
- wherein the system has a plurality of user selectable noise reduction transfer functions, and
- wherein the system is configured to reduce a level of the noise cancellation signal in response to an external trigger.
A listening system, comprising:
- an apparatus;
- and
- a listening device, comprising at least one first microphone and at least one first loudspeaker;
- wherein the listening device may be connected to the apparatus by means of a short-range wireless connection, such that the loudspeaker of the listening device can play sounds in response to signals generated in the apparatus;
- wherein the system comprises noise reduction circuitry configured for generating a noise cancellation signal by applying a noise reduction transfer function to a signal generated by the microphone of the listening device,
- wherein the noise reduction transfer function is adjustable by a user of the listening system, and
- wherein the system is configured to reduce a level of the noise cancellation signal in response to an external trigger.
A listening system, comprising:
- an apparatus;
- and
- a listening device, comprising at least one first microphone and at least one first loudspeaker;
- wherein the listening device may be connected to the apparatus by means of a short-range wireless connection, such that the loudspeaker of the listening device can play sounds in response to signals from the apparatus;
- wherein the system comprises noise reduction circuitry configured for generating a noise cancellation signal by applying a noise reduction transfer function to a signal generated by the microphone of the listening device,
- wherein the system has a plurality of user selectable noise reduction transfer functions, and
- wherein the system is configured to reduce a level of the noise cancellation signal in response to an external trigger.
Dependencies are inferred from the claim text.