| 摘要 |
In order to realize a correction for changes in the reproduction loudness at low frequencies in a downmix-arrangement, a mixing arrangement is proposed for mixing at least two audio signals, which mixing arrangement is provided with a first unit (104) for deriving a first power signal, which is a measure for the power of the first audio signal, a second unit (105) for deriving a second power signal, which is a measure for the power of the second audio signal, a cross-correlation unit (103) for deriving a cross-correlation signal, which is a measure for a cross-correlation between the first and the second audio signal, a unit (106) for deriving multiplication parameters from the first and second power signals and the cross-correlation signal, and a multiplication and combination unit (107) for carrying out a signal processing on the first and second audio signals and combining them. The unit (106) for deriving the multiplication parameters is provided with a combination unit (110) for deriving a combination signal which is a measure for a combination of the first and second power signals and the cross-correlation signal, and is provided with a scaling unit (109) for scaling one of the signals in the unit for deriving the multiplication parameters with a scaling signal. The scaling signal (D[k]) has a frequency characteristic which is a substantially constant below a first frequency value (kL), is increasing between the first frequency value (kL) and a second higher frequency value (kU) and is again substantially constant above the second frequency value. The unit (106) for deriving the multiplication parameters is further adapted to derive a single multiplication parameter m[k]) from the combination signal, and the multiplications and combination unit (107) is adapted to carry out a signal processing on the first and second audio signals which is equivalent to multiplying the first and second audio signals with this single multiplication parameter, and combining the so multiplied first and second audio signals. |
