Noise suppression

1. A method of noise suppression for a noise suppression module in a communication device, the module being coupled to a radio transmitter, the method comprising:

the module receiving information regarding at least one of the following: radio transmission activity and radio transmission power; the module suppressing, based on the received information, audio path noise; and decomposing, before changing the radio transmission activity or the radio transmission power, the noise into general audio noise and burst noise,

wherein the decomposition comprises considering a frequency bin where burst noise is present and taking two adjacent frequency bins which are free from burst noise and determining the level of general audio noise in these two bins, then applying linear regression, interpolation or averaging to the general audio noise values of these two bins to estimate general audio noise in the frequency bin where burst noise is present, then taking a previous measurement result of the total noise for a bin where burst noise is present and obtaining the burst noise before the change of the radio transmission activity or radio transmission power by subtracting the general audio noise from the total noise.

2. The method according to claim 1 , wherein the method further comprising estimating, before changing the radio transmission activity or the radio transmission power, the audio path noise.

3. The method according to claim 1 , wherein the burst noise, after the radio transmission power change, is obtained by correcting the burst noise before the radio transmission power change by the same amount as the radio transmission power change.

4. The method according to claim 3 , wherein the audio path noise is obtained by adding up the corrected burst noise and the general audio noise.

5. The method according to claim 1 , wherein in case of radio transmission stop the audio path noise after the radio transmission stop equals the general audio noise level.

6. The method according to claim 1 , wherein in case of radio transmission restart, the audio path noise is obtained by taking the audio path noise measured when the radio was transmitting.

7. The method according to claim 1 , wherein the received information represents a synthesised or probed signal representing in time the radio transmission activity or the radio transmission power.

8. The method according to claim 7 , wherein the synthesised signal is based on information received from a protocol stack of the communication device, where the protocol stack controls the operation of the radio transmitter.

9. The method according to claim 7 , wherein once the synthesised signal is obtained, then obtaining estimated audio path noise, which is a filter transfer function of the module in function of the synthesised signal.

10. The method according to claim 9 , wherein the noise suppression comprises training the filter coefficients so that the estimated noise subtracted from a radio path coupling function in function of radio signal output level in time tends to zero.

11. A non-transitory computer program product comprising instructions for implementing the steps of a method according to claim 1 when loaded and run on computer means of a communication device.