ARRANGEMENT FOR MIXING AT LEAST TWO AUDIO SIGNALS

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.

主权项

1. Arrangement for mixing at least two audio signals, comprising:
inputs for receiving the at least two audio signals, a first unit for deriving a first power signal, which first power signal is a measure for the power of the first audio signal, a second unit for deriving a second power signal, which second power signal is a measure for the power of the second audio signal, a cross-correlation unit for deriving a cross-correlation signal, which is a measure of the cross-correlation between the first and second audio signal, a unit for deriving at least one multiplication parameter from the first and second power signals and the cross-correlation signal, a multiplication and combination unit for carrying out a signal processing on the first and second audio signals, which is equivalent to:
multiplying the first audio signal with a multiplication parameter,multiplying the second audio signal with a multiplication parameter,combining the so multiplied first and second audio signals to generate a mixed audio signal, wherein the unit for deriving a multiplication parameter is provided with a combination unit for deriving a combination signal which is a measure for the combination of the first and second power signals and the cross-correlation signal, and provided with a scaling unit for scaling a signal component in the unit for deriving a multiplication parameter with a scaling signal, that the scaling signal (D[k]) has a frequency characteristic which is substantially constant in a frequency range below a first frequency value (kL), increases in a frequency range between the first frequency value (kL) and a second higher frequency value (kU) and is again substantially constant in a frequency range above the second frequency value, that the unit for deriving a multiplication parameter is adapted to derive a single multiplication parameter (m[k]) from the combination signal, and that the multiplication and combination unit is adapted to carry out a signal processing on the first and second audio signals which is equivalent to
multiplying the first audio signal and the second audio signal with the single multiplication parameter, andcombining the so multiplied first and second audio signals.