Device for processing an audio signal
Disclosed is a device ( 1 ) for processing an initial audio signal ( 4 ), including: a treble detecting block ( 2 ) capable of analyzing the initial audio signal to determine a treble level; and a filter block ( 3 ) capable of attenuating the initial audio signal in the treble, if the treble level is less than a maximum threshold.
1. A device ( 1 ) for processing an initial audio signal ( 4 ) defined by a spectrum of frequencies, the device comprising:
a treble detecting block ( 2 ) that analyzes the initial audio signal ( 4 ) and determines a treble level of the initial audio signal, where the treble level indicates a level of energy of a treble portion of the initial audio signal defined by a detection band of treble frequencies; and
a filter block ( 3 ) that, on condition that the treble level detected by the treble detecting block is less than a maximum threshold (Smax), attenuates the initial audio signal ( 4 ) at frequencies that exceed an attenuation cut-off frequency (F ca ), said attenuation cut-off frequency (F ca ) being a frequency inside the detection band of treble frequencies.
2. The device ( 1 ) as claimed in claim 1 , wherein the treble detecting block ( 2 ) comprises a determining means that determines the treble level as a ratio of an energy (Ea) of the initial audio signal ( 4 ) in the detection band ( 6 ) to a total energy (Et) of the initial audio signal ( 4 ).
3. The device ( 1 ) as claimed in claim 2 , wherein the detection band ( 6 ) extends from 7 kHz to 13 kHz.
4. The device ( 1 ) as claimed in claim 3 , wherein the attenuation cut-off frequency F ca , is 10 kHz.
5. The device ( 1 ) as claimed in claim 4 , wherein the filter block performs minimal attenuation (Amin) when the determined treble level is greater than or equal to the maximum threshold (Smax).
6. The device ( 1 ) as claimed in claim 3 , wherein the filter block performs minimal attenuation (Amin) when the determined treble level is greater than or equal to the maximum threshold (Smax).
7. The device ( 1 ) as claimed in claim 3 , wherein the filter block performs zero attenuation when the treble level is greater than or equal to the maximum threshold (Smax).
8. The device ( 1 ) as claimed in claim 2 , wherein the attenuation cut-off frequency F ca , is 10 kHz.
9. The device ( 1 ) as claimed in claim 8 , wherein the filter block performs minimal attenuation (Amin) when the determined treble level is greater than or equal to the maximum threshold (Smax).
10. The device ( 1 ) as claimed in claim 2 , wherein the filter block performs minimal attenuation (Amin) when the determined treble level is greater than or equal to the maximum threshold (Smax).
11. The device ( 1 ) as claimed in claim 2 , wherein the filter block performs zero attenuation when the treble level is greater than or equal to the maximum threshold (Smax).
12. The device ( 1 ) as claimed in claim 1 , wherein the attenuation cut-off frequency F ca , is 10 kHz.
13. The device ( 1 ) as claimed in claim 12 , wherein the filter block performs minimal attenuation (Amin) when the determined treble level is greater than or equal to the maximum threshold (Smax).
14. The device ( 1 ) as claimed in claim 1 , wherein the filter block performs minimal attenuation (Amin) when the determined treble level is greater than or equal to the maximum threshold (Smax).
15. The device ( 1 ) as claimed in claim 1 , wherein the filter block performs zero attenuation when the treble level is greater than or equal to the maximum threshold (Smax).
16. The device ( 1 ) as claimed in claim 1 , wherein the attenuation (A) performed by the filter block is maximal (Amax) when the treble level is less than or equal to a minimum threshold (Smin), said minimum threshold (Smin) being less than the maximum threshold (Smax).
17. The device ( 1 ) as claimed in claim 1 , wherein the attenuation (A) performed by the filter block is total when the treble level is less than or equal to a minimum threshold (Smin), said minimum threshold (Smin) being less than the maximum threshold (Smax).
18. The device ( 1 ) as claimed in claim 1 , wherein the attenuation (A) performed by the filter block is applied linearly by the filter block as a function of the treble level detected by the treble detecting block, between a maximum attenuation (Amax) corresponding to the minimum threshold (Smin) and a minimum attenuation (Amin) corresponding to the maximum threshold (Smax).
19. The device ( 1 ) as claimed in claim 1 , further comprising:
a time block that causes an activation and/or a deactivation of the filter block ( 3 ) to be performed as a transition over a non-zero period of time.
20. A radio receiver comprising the device ( 1 ) as claimed in claim 1 .