| 摘要 |
A sub-band splitter unit for splitting a broadband input signal (G1), e.g., an audio signal, in K narrowband sub-band signals (L1, . . . , Lk, . . . . , LK), wherein K is an integer larger than 1, which sub-band splitter unit (100) is provided with an input terminal (100) for receiving the broadband input signal and K−1 sub-band filter circuits (SBF1, . . . , SBFk, . . . , SBFK−1), each of the sub-band filter circuits (SBFk) is provided with an input (103.k) and a first (104.k) and a second output (105.k), a first filter arrangement (LPFk) coupled between the input (103.k) and the first output (104.k), a second filter arrangement (HPFk) coupled between the input (103.k) and the second output (105.k), and the sub-band splitter unit is provided with K output terminals (102.1, . . . , 102.k, . . . , 102.K) for supplying the K sub-band signals. The first output (104.k) of a k-th sub-band filter circuit (SBFk) is coupled to an input (103.k+1) of the (k+1)-th sub-band filter circuit. The input (103.1) of the first sub-band filter circuit (SBF1) is coupled to the input (101) of the sub-band splitter unit. The second output (105.k) of a k-th sub-band filter circuit is coupled to the k-th output (102.k) of the sub-band splitter unit. |
| 主权项 |
1. Sub-band splitter unit for splitting a broadband input signal into K narrowband sub-band signals (L1, . . . , Lk, . . . , LK), wherein K is an integer number larger than 1, and wherein sub-band-splitter unit (100) is provided with:
an input terminal for receiving the broadband input signal, a filter unit (SBF1, SBF2, SBF3, . . . ) for filtering the broadband input signal for generating the K narrowband sub-band signals, provided with an input (103.1), coupled to the input terminal of the sub-band splitter unit, and with K outputs (105.1, 105.2, . . . , 105.k, . . . ) for supplying the K narrowband sub-band signals, K output terminals (102.1, . . . , 102.k, . . . , 102.K) for supplying the K sub-band signals, wherein the K output terminals are each coupled to one of the K outputs (105.1, 105.2, 105.3, . . . ) of the filter unit,wherein
the filter unit is provided with K−1 sub-band filter circuits (SBF1, . . . , SBFk, . . . , SBFK−1), each of the sub-band filter circuits (SBFk) is provided with
an input (103.k) and a first (104.k) and a second (105.k) output,a first filter arrangement (LPFk), coupled between the input (103.k) and the first output (104.k),a second filter arrangement (HPFk), coupled between the input (103.k) and the second output (105.k), in that
the first output (104.k) of a k-th sub-band filter circuit (SBFk) is coupled to the input (103.k+1) of the (k+1)-th sub-band filter circuit,the input (103.1) of the first sub-band filter circuit (SBF1) is coupled with the input (103.1) of the filter unit (SBF1, SBF2, SBF3, . . . ),the second output (105.k) of a k-th sub-band filter circuit is coupled with a k-th output (102.k) of the filter unit (SBF1, SBF2, SBF3, . . . ), andthe first output (104.K−1) of the (K−1)-th sub-band filter circuit is coupled to the K-th output (104.K−1) of the filter unit,in that the first filter arrangement (LPFk) of a sub-band filter circuit is adapted for carrying out a lowpass filtering on the signal at the input of the of the first filter arrangement,and the second filter arrangement (HPFk) is adapted for carrying out a highpass filtering on the signal at the input of the second filter arrangement,and wherein the sub-band splitter unit is devoid of down-sampling means. |
