Bass enhancement
View Patent ↗The present invention relates to a bass enhancement system comprising a bass substitution filter with variable gain and variable band width, wherein said variable gain and variable bandwidth at least partly depends on characteristics of an input signal. The present invention further relates to a bass enhancement system according to the above, further comprising a hearing compensation filter and a loudspeaker bass response compensation filter, wherein said input signal is coupled to said hearing compensation filter, the output of which is coupled to said loudspeaker bass response filter, the output of which is coupled to said bass substitution filter. The present invention further relates to a method of enhancing bass perception comprising boosting a reproducible bass frequency band in accordance with characteristics of signal content in a substantially non-reproducible bass frequency band.
1. Method of performing a bass enhancement of an input audio signal, the input audio signal being intended for amplification and subsequent audio reproduction by a loud speaker,
the input signal having low frequency audio components and thereto associated harmonics,
wherein the bass enhancement of said input signal is obtained by filtering of said associated harmonics already present in the input signal,
the filtering comprises obtaining said associated harmonics from the input signal and increasing a gain in a frequency range of said associated harmonics when a level of said low frequency audio components increases, and
wherein a center frequency of said frequency range is increased when the level of said low frequency audio components increases.
2. The method according to claim 1 , wherein the bandwidth of said frequency range is increased when the level of said low frequency audio components increases.
3. The method according to claim 1 , wherein said increase of said gain of said filtering when said level of said low frequency audio components increase is controlled by an expander side chain.
4. The method according to claim 1 , wherein said gain of said filtering is further based on a setting of a user gain control related to an intended playback level.
5. Method of performing a bass enhancement of an input audio signal, the input audio signal being intended for amplification and subsequent audio reproduction by a loud speaker,
the input signal having low frequency audio components and thereto associated harmonics,
wherein the bass enhancement of said input signal is obtained by filtering of said associated harmonics already present in the input signal,
the filtering comprises obtaining said associated harmonics from the input signal and increasing a gain in a frequency range of said associated harmonics when a level of said low frequency audio components increases,
wherein a bandwidth of said frequency range is increased when the level of said low frequency audio components increases; and
wherein a center frequency of said frequency range is increased when the level of said low frequency audio components increases.
6. The method according to claim 5 , wherein said increase of said gain of said filtering when said level of said low frequency audio components increase is controlled by an expander side chain.
7. The method according to claim 5 , wherein said gain of said filtering is further based on a setting of a user gain control related to an intended playback level.
8. Method of performing a bass enhancement of an input audio signal, the audio input signal being intended for amplification and subsequent audio reproduction by a loudspeaker,
the input signal having low frequency audio components and thereto associated harmonics,
wherein the bass enhancement is performed according to a level of the input signal, comprising:
boosting said low frequency audio components where the input signal level is below a low level, and
obtaining said associated harmonics from the input signal and boosting said associated harmonics where the input signal level is above a high level;
wherein said high level is above said low level.
9. The method according to claim 8 , wherein said boosting said associated harmonics is performed over a frequency band, and wherein a center frequency of said frequency band increases when the level of said low frequency audio components increases.
10. The method according to claim 8 , wherein said boosting said associated harmonics when said input signal level is above said high level is controlled by an expander side chain.
11. The method according to claim 8 , wherein said boosting said low frequency audio components when said input signal level is below said low level is controlled by a compressor side chain.
12. The method according to claim 8 , wherein said boosting is further based on a setting of a user gain control related to an intended playback level.