Communication apparatus with ambient noise reduction
A host device configured to be wirelessly coupled to an accessory device, the host device comprising noise reduction circuitry, wherein, in use of the host device: a signal generated by a microphone of the accessory device in response to ambient noise is supplied to the noise reduction circuitry; the noise reduction circuitry applies a noise reduction transfer function to the signal supplied thereto to generate a noise cancellation signal; and the noise cancellation signal is supplied to at least one loudspeaker of the accessory device; and wherein the noise reduction transfer function applied by the noise reduction circuitry is user selectable or user adjustable.
1. A system comprising:
a host device; and
a listening device that is wirelessly couplable to the host device,
wherein the system comprises:
noise reduction circuitry configured for generating a noise cancellation signal,
and wherein the system is configured to adjust a level of the noise cancellation signal in response to occurrence of a system event during audio playback via the listening device with noise cancellation switched on, wherein a system event comprises an event arising within the system that causes the system to generate an alert for alerting a user of the system.
2. A system according to claim 1 , wherein the system is configured to reduce the level of the noise cancellation signal in response to the system event.
3. A system according to claim 1 , wherein the noise reduction circuitry is configured to apply a noise reduction transfer function to a signal generated by a microphone of the listening device.
4. A system according to claim 1 , wherein the host device comprises an audio processing module.
5. A system according to claim 4 , wherein the audio processing module is configured to act as a source of a desired drive signal to be applied to a loudspeaker of the listening device.
6. A system according to claim 1 , wherein the noise reduction circuitry is provided in the host device.
7. A system according to claim 1 , wherein the host device is a communications apparatus.
8. A system according to claim 7 , wherein the host device is a mobile phone handset.
9. A system according to claim 7 , wherein the system event is an incoming call to the host device.
10. A system according to claim 1 , wherein the listening device comprises a pair of ear buds, each comprising at least one first microphone and at least one first loudspeaker.