AUDIO SIGNAL DECORRELATOR, MULTI CHANNEL AUDIO SIGNAL PROCESSOR, AUDIO SIGNAL PROCESSOR, METHOD FOR DERIVING AN OUTPUT AUDIO SIGNAL FROM AN INPUT AUDIO SIGNAL AND COMPUTER PROGRAM
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Abstract
An audio signal decorrelator for deriving an output audio signal from an input audio signal has a frequency analyzer for extracting from the input audio signal a first partial signal descriptive of an audio content in a first audio frequency range and a second partial signal descriptive of an audio content in a second audio frequency range having higher frequencies compared to the second audio frequency range. A partial signal modifier for modifies the first and second partial signals, to obtain first and second processed partial signals, so that a modulation amplitude of a time variant phase shift or time variant delay applied to the first partial signal is higher than that applied to the second partial signal, or for modifying only the first partial signal. A signal combiner combines the first and second processed partial signals, or combines the first processed partial signal and the second partial signal, to obtain an output audio signal.
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Citations
62 Claims
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1-30. -30. (canceled)
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31. :
- An audio signal decorrelator for deriving an output audio signal from an input audio signal, the audio signal decorrelator comprising;
a frequency analyzer for extracting a first partial signal and a second partial signal from the input audio signal, the first partial signal being descriptive of an audio content in a first audio frequency range, the second partial signal being descriptive of an audio content in a second audio frequency range, the first audio frequency range comprising higher frequencies compared to the second audio frequency range; a partial signal modifier for modifying the first partial signal, to acquire a first processed partial signal, and the second partial signal, to acquire a second processed partial signal, so that a modulation amplitude of a time variant phase shift or time variant delay applied to the first partial signal is higher than a modulation amplitude of a time variant phase shift or a time variant delay applied to the second partial signal, or for modifying only the first partial signal, so that a time variant phase shift or a time variant delay is applied to the first partial signal; and a signal combiner for combining the first processed partial signal and the second processed partial signal, or for combining the first processed partial signal and the second partial signal, to acquire an output audio signal. - View Dependent Claims (32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44)
- An audio signal decorrelator for deriving an output audio signal from an input audio signal, the audio signal decorrelator comprising;
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45. :
- A multi channel audio signal processor for decorrelating a first channel audio signal and a second channel audio signal, to acquire a first decorrelated output audio signal and a second decorrelated output audio signal, the multi channel audio signal processor comprising;
a first audio signal decorrelator for deriving an output audio signal from an input audio signal, the audio signal decorrelator comprising; a frequency analyzer for extracting a first partial signal and a second partial signal from the input audio signal, the first partial signal being descriptive of an audio content in a first audio frequency range, the second partial signal being descriptive of an audio content in a second audio frequency range, the first audio frequency range comprising higher frequencies compared to the second audio frequency range; a partial signal modifier for modifying the first partial signal, to acquire a first processed partial signal, and the second partial signal, to acquire a second processed partial signal, so that a modulation amplitude of a time variant phase shift or time variant delay applied to the first partial signal is higher than a modulation amplitude of a time variant phase shift or a time variant delay applied to the second partial signal, or for modifying only the first partial signal, so that a time variant phase shift or a time variant delay is applied to the first partial signal; and a signal combiner for combining the first processed partial signal and the second processed partial signal, or for combining the first processed partial signal and the second partial signal, to acquire an output audio signal, wherein the first audio signal decorrelator is adapted to receive as the input audio signal the first channel audio signal, and wherein the output audio signal of the first audio signal decorrelator forms the first decorrelated output audio signal; wherein the second channel audio signal or a signal derived therefrom forms the second decorrelated output audio signal; and wherein the first audio signal decorrelator is adapted such that audio contents in the first audio frequency range of the first decorrelated output audio signal and of the second decorrelated output audio signal comprise a stronger time-variant phase shift modulation with respect to each other than audio contents in the second audio frequency range of the first decorrelated output audio signal and of the second decorrelated audio output signal. - View Dependent Claims (46, 47, 48, 49, 50, 51)
- A multi channel audio signal processor for decorrelating a first channel audio signal and a second channel audio signal, to acquire a first decorrelated output audio signal and a second decorrelated output audio signal, the multi channel audio signal processor comprising;
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52. :
- An audio signal processor for receiving a first channel audio signal, a second channel audio signal, a third channel audio signal, a fourth channel audio signal and a fifth channel audio signal being part of a multi channel audio signal, the audio signal processor comprising;
a first multi channel audio signal processor for decorrelating a first channel audio signal and a second channel audio signal, to acquire a first decorrelated output audio signal and a second decorrelated output audio signal, the multi channel audio signal processor comprising; a first audio signal decorrelator for deriving an output audio signal from an input audio signal, the audio signal decorrelator comprising; a frequency analyzer for extracting a first partial signal and a second partial signal from the input audio signal, the first partial signal being descriptive of an audio content in a first audio frequency range, the second partial signal being descriptive of an audio content in a second audio frequency range, the first audio frequency range comprising higher frequencies compared to the second audio frequency range; a partial signal modifier for modifying the first partial signal, to acquire a first processed partial signal, and the second partial signal, to acquire a second processed partial signal, so that a modulation amplitude of a time variant phase shift or time variant delay applied to the first partial signal is higher than a modulation amplitude of a time variant phase shift or a time variant delay applied to the second partial signal, or for modifying only the first partial signal, so that a time variant phase shift or a time variant delay is applied to the first partial signal; and a signal combiner for combining the first processed partial signal and the second processed partial signal, or for combining the first processed partial signal and the second partial signal, to acquire an output audio signal, wherein the first audio signal decorrelator is adapted to receive as the input audio signal the first channel audio signal, and wherein the output audio signal of the first audio signal decorrelator forms the first decorrelated output audio signal; wherein the second channel audio signal or a signal derived therefrom forms the second decorrelated output audio signal; and wherein the first audio signal decorrelator is adapted such that audio contents in the first audio frequency range of the first decorrelated output audio signal and of the second decorrelated output audio signal comprise a stronger time-variant phase shift modulation with respect to each other than audio contents in the second audio frequency range of the first decorrelated output audio signal and of the second decorrelated audio output signal, wherein the first multi channel audio signal processor receives as its first channel audio signal the first channel audio signal of the multi channel signal, and wherein the first multi channel audio signal processor receives as its second channel audio signal the second channel audio signal of the multi channel signal; a second multi channel audio signal processor for decorrelating a first channel audio signal and a second channel audio signal, to acquire a first decorrelated output audio signal and a second decorrelated output audio signal, the multi channel audio signal processor comprising; a first audio signal decorrelator for deriving an output audio signal from an input audio signal, the audio signal decorrelator comprising; a frequency analyzer for extracting a first partial signal and a second partial signal from the input audio signal, the first partial signal being descriptive of an audio content in a first audio frequency range, the second partial signal being descriptive of an audio content in a second audio frequency range, the first audio frequency range comprising higher frequencies compared to the second audio frequency range; a partial signal modifier for modifying the first partial signal, to acquire a first processed partial signal, and the second partial signal, to acquire a second processed partial signal, so that a modulation amplitude of a time variant phase shift or time variant delay applied to the first partial signal is higher than a modulation amplitude of a time variant phase shift or a time variant delay applied to the second partial signal, or for modifying only the first partial signal, so that a time variant phase shift or a time variant delay is applied to the first partial signal; and a signal combiner for combining the first processed partial signal and the second processed partial signal, or for combining the first processed partial signal and the second partial signal, to acquire an output audio signal, wherein the first audio signal decorrelator is adapted to receive as the input audio signal the first channel audio signal, and wherein the output audio signal of the first audio signal decorrelator forms the first decorrelated output audio signal; wherein the second channel audio signal or a signal derived therefrom forms the second decorrelated output audio signal; and wherein the first audio signal decorrelator is adapted such that audio contents in the first audio frequency range of the first decorrelated output audio signal and of the second decorrelated output audio signal comprise a stronger time-variant phase shift modulation with respect to each other than audio contents in the second audio frequency range of the first decorrelated output audio signal and of the second decorrelated audio output signal, wherein the second multi channel audio signal processor receives as its first channel audio signal the third channel audio signal of the multi channel signal, and wherein the second multi channel audio signal processor receives as its second channel audio signal the fourth channel audio signal of the multi channel signal; and an audio signal decorrelator for deriving an output audio signal from an input audio signal, the audio signal decorrelator comprising; a frequency analyzer for extracting a first partial signal and a second partial signal from the input audio signal, the first partial signal being descriptive of an audio content in a first audio frequency range, the second partial signal being descriptive of an audio content in a second audio frequency range, the first audio frequency range comprising higher frequencies compared to the second audio frequency range; a partial signal modifier for modifying the first partial signal, to acquire a first processed partial signal, and the second partial signal, to acquire a second processed partial signal, so that a modulation amplitude of a time variant phase shift or time variant delay applied to the first partial signal is higher than a modulation amplitude of a time variant phase shift or a time variant delay applied to the second partial signal, or for modifying only the first partial signal, so that a time variant phase shift or a time variant delay is applied to the first partial signal; and a signal combiner for combining the first processed partial signal and the second processed partial signal, or for combining the first processed partial signal and the second partial signal, to acquire an output audio signal, wherein the audio signal decorrelator receives as its input audio signal the fifth channel audio signal of the multi channel signal, the output signals of the first multi channel audio signal processor, the second multi channel audio signal processor and the audio signal decorrelator forming a decorrelated five channel signal. - View Dependent Claims (53, 54, 55)
- An audio signal processor for receiving a first channel audio signal, a second channel audio signal, a third channel audio signal, a fourth channel audio signal and a fifth channel audio signal being part of a multi channel audio signal, the audio signal processor comprising;
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56. :
- An audio conference system, comprising;
an audio input for receiving a first channel audio signal and a second channel audio signal; a multi channel audio signal processor for decorrelating a first channel audio signal and a second channel audio signal, to acquire a first decorrelated output audio signal and a second decorrelated output audio signal, the multi channel audio signal processor comprising; a first audio signal decorrelator for deriving an output audio signal from an input audio signal, the audio signal decorrelator comprising; a frequency analyzer for extracting a first partial signal and a second partial signal from the input audio signal, the first partial signal being descriptive of an audio content in a first audio frequency range, the second partial signal being descriptive of an audio content in a second audio frequency range, the first audio frequency range comprising higher frequencies compared to the second audio frequency range; a partial signal modifier for modifying the first partial signal, to acquire a first processed partial signal, and the second partial signal, to acquire a second processed partial signal, so that a modulation amplitude of a time variant phase shift or time variant delay applied to the first partial signal is higher than a modulation amplitude of a time variant phase shift or a time variant delay applied to the second partial signal, or for modifying only the first partial signal, so that a time variant phase shift or a time variant delay is applied to the first partial signal; and a signal combiner for combining the first processed partial signal and the second processed partial signal, or for combining the first processed partial signal and the second partial signal, to acquire an output audio signal, wherein the first audio signal decorrelator is adapted to receive as the input audio signal the first channel audio signal, and wherein the output audio signal of the first audio signal decorrelator forms the first decorrelated output audio signal; wherein the second channel audio signal or a signal derived therefrom forms the second decorrelated output audio signal; and wherein the first audio signal decorrelator is adapted such that audio contents in the first audio frequency range of the first decorrelated output audio signal and of the second decorrelated output audio signal comprise a stronger time-variant phase shift modulation with respect to each other than audio contents in the second audio frequency range of the first decorrelated output audio signal and of the second decorrelated audio output signal, the multi channel audio signal processor receiving the first channel audio signal and the second channel audio signal; a first electroacoustic transducer for outputting the first decorrelated output audio signal provided by the multi channel audio signal processor; a second electroacoustic transducer for outputting the second decorrelated output audio signal provided by the multi channel audio signal processor; a microphone acoustically coupled with a first electroacoustic transducer an a second electroacoustic transducer, the microphone providing a microphone signal descriptive of the acoustic signal; an echo cancellation unit for reducing or removing an audio content output by the first electroacoustic transducer from the microphone signal, and for reducing or removing an audio content output by the second electroacoustic transducer from the microphone signal, wherein the echo cancellation unit is adapted to filter the decorellated output audio signals in dependence on filter coefficients, to remove or subtract the filtered version of the decorrelated output audio signals from the microphone signal, to acquire a echo-reduced microphone signal, and to adjust the filter parameters in dependence on the echo-reduced microphone signal, to minimize an audio content output by the electroacoustic transducers in the echo-reduced microphone signal.
- An audio conference system, comprising;
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57. :
- A method for deriving an output audio signal from an input audio signal, the method comprising;
extracting a first partial signal and a second partial signal from the input audio signal, the first partial signal being descriptive of an audio content in a first audio frequency range, the second partial signal being descriptive of an audio content in a second audio frequency range, the first audio frequency range comprising higher frequencies compared to the second audio frequency range; modifying the first partial signal, to acquire a first processed partial signal, and the second partial signal, to acquire a second processed partial signal, so that a modulation amplitude of a time variant phase shift or time variant delay applied to the first partial signal is higher than a modulation amplitude of a time variant phase shift or a time variant delay applied to the second partial signal, or modifying only the first partial signal, so that a time variant phase shift or a time variant delay is applied to the first partial signal; and combining the first processed partial signal and the second processed partial signal, or combining the first processed partial signal and the second partial signal, to acquire an output audio signal. - View Dependent Claims (60)
- A method for deriving an output audio signal from an input audio signal, the method comprising;
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58. :
- A method for decorrelating a first channel audio signal and a second channel audio signal, to acquire a first decorrelated output audio signal and a second decorrelated output audio signal, the method comprising;
deriving an output audio signal from an input audio signal using a method for deriving an output audio signal from an input audio signal, the method comprising; extracting a first partial signal and a second partial signal from the input audio signal, the first partial signal being descriptive of an audio content in a first audio frequency range, the second partial signal being descriptive of an audio content in a second audio frequency range, the first audio frequency range comprising higher frequencies compared to the second audio frequency range; modifying the first partial signal, to acquire a first processed partial signal, and the second partial signal, to acquire a second processed partial signal, so that a modulation amplitude of a time variant phase shift or time variant delay applied to the first partial signal is higher than a modulation amplitude of a time variant phase shift or a time variant delay applied to the second partial signal, or modifying only the first partial signal, so that a time variant phase shift or a time variant delay is applied to the first partial signal; and combining the first processed partial signal and the second processed partial signal, or combining the first processed partial signal and the second partial signal, to acquire an output audio signal, wherein the first channel audio signal forms the input audio signal, and wherein the output audio signal forms the first decorrelated output audio signal; and providing the second channel audio signal or a signal derived therefrom as the second decorrelated output audio signal; wherein the method for decorrelating is executed such that audio contents in the first audio frequency range of the first decorrelated output audio signal and of the second decorrelated output audio signal comprise a larger time-variant phase shift modulation amplitude with respect to each other than audio contents in the second audio frequency range of the first decorrelated output audio signal and of the second decorellated audio output signal. - View Dependent Claims (61)
- A method for decorrelating a first channel audio signal and a second channel audio signal, to acquire a first decorrelated output audio signal and a second decorrelated output audio signal, the method comprising;
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59. :
- A method for processing a multi channel audio signal, the method comprising;
receiving a first channel audio signal, a second channel audio signal, a third channel audio signal, a fourth channel audio signal and a fifth channel audio signal being part of a multi channel audio signal; decorrelating the first channel audio signal and the second channel audio signal of the five channel audio signal using a method for decorrelating a first channel audio signal and a second channel audio signal, to acquire a first decorrelated output audio signal and a second decorrelated output audio signal, the method comprising; deriving an output audio signal from an input audio signal using a method for deriving an output audio signal from an input audio signal, the method comprising; extracting a first partial signal and a second partial signal from the input audio signal, the first partial signal being descriptive of an audio content in a first audio frequency range, the second partial signal being descriptive of an audio content in a second audio frequency range, the first audio frequency range comprising higher frequencies compared to the second audio frequency range; modifying the first partial signal, to acquire a first processed partial signal, and the second partial signal, to acquire a second processed partial signal, so that a modulation amplitude of a time variant phase shift or time variant delay applied to the first partial signal is higher than a modulation amplitude of a time variant phase shift or a time variant delay applied to the second partial signal, or modifying only the first partial signal, so that a time variant phase shift or a time variant delay is applied to the first partial signal; and combining the first processed partial signal and the second processed partial signal, or combining the first processed partial signal and the second partial signal, to acquire an output audio signal, wherein the first channel audio signal forms the input audio signal, and wherein the output audio signal forms the first decorrelated output audio signal; and providing the second channel audio signal or a signal derived therefrom as the second decorrelated output audio signal; wherein the method for decorrelating is executed such that audio contents in the first audio frequency range of the first decorrelated output audio signal and of the second decorrelated output audio signal comprise a larger time-variant phase shift modulation amplitude with respect to each other than audio contents in the second audio frequency range of the first decorrelated output audio signal and of the second decorellated audio output signal, to acquire two signals of a decorrelated multi channel signal; decorrelating the third channel audio signal and the fourth channel audio signal of the multi channel audio signal using a method for decorrelating a first channel audio signal and a second channel audio signal, to acquire a first decorrelated output audio signal and a second decorrelated output audio signal, the method comprising; deriving an output audio signal from an input audio signal according to the method for deriving an output audio signal from an input audio signal, the method comprising; extracting a first partial signal and a second partial signal from the input audio signal, the first partial signal being descriptive of an audio content in a first audio frequency range, the second partial signal being descriptive of an audio content in a second audio frequency range, the first audio frequency range comprising higher frequencies compared to the second audio frequency range; modifying the first partial signal, to acquire a first processed partial signal, and the second partial signal, to acquire a second processed partial signal, so that a modulation amplitude of a time variant phase shift or time variant delay applied to the first partial signal is higher than a modulation amplitude of a time variant phase shift or a time variant delay applied to the second partial signal, or modifying only the first partial signal, so that a time variant phase shift or a time variant delay is applied to the first partial signal; and combining the first processed partial signal and the second processed partial signal, or combining the first processed partial signal and the second partial signal, to acquire an output audio signal, wherein the first channel audio signal forms the input audio signal, and wherein the output audio signal forms the first decorrelated output audio signal; and providing the second channel audio signal or a signal derived therefrom as the second decorrelated output audio signal; wherein the method for decorrelating is executed such that audio contents in the first audio frequency range of the first decorrelated output audio signal and of the second decorrelated output audio signal comprise a larger time-variant phase shift modulation amplitude with respect to each other than audio contents in the second audio frequency range of the first decorrelated output audio signal and of the second decorellated audio output signal, to acquire two further signals of the processed multi channel signal; and decorrelating the fifth channel audio signal of the multi channel audio signal using a method for deriving an output audio signal from an input audio signal, the method comprising; extracting a first partial signal and a second partial signal from the input audio signal, the first partial signal being descriptive of an audio content in a first audio frequency range, the second partial signal being descriptive of an audio content in a second audio frequency range, the first audio frequency range comprising higher frequencies compared to the second audio frequency range; modifying the first partial signal, to acquire a first processed partial signal, and the second partial signal, to acquire a second processed partial signal, so that a modulation amplitude of a time variant phase shift or time variant delay applied to the first partial signal is higher than a modulation amplitude of a time variant phase shift or a time variant delay applied to the second partial signal, or modifying only the first partial signal, so that a time variant phase shift or a time variant delay is applied to the first partial signal; and combining the first processed partial signal and the second processed partial signal, or combining the first processed partial signal and the second partial signal, to acquire an output audio signal, to acquire a fifth signal of the processed multi channel signal. - View Dependent Claims (62)
- A method for processing a multi channel audio signal, the method comprising;
Specification