SYSTEMS, METHODS, AND APPARATUS FOR MULTICHANNEL SIGNAL BALANCING
First Claim
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1. A method of processing a multichannel audio signal, said method comprising:
- calculating a series of values of a level of a first channel of the audio signal over time;
calculating a series of values of a level of a second channel of the audio signal over time;
based on the series of values of a level of the first channel and the series of values of a level of the second channel, calculating a series of values of a gain factor over time; and
controlling the amplitude of the second channel relative to the amplitude of the first channel over time according to the series of values of the gain factor,wherein said method includes indicating that a segment of the audio signal is an information segment, andwherein calculating a series of values of a gain factor over time includes, for at least one of the series of values of the gain factor and in response to said indicating, calculating the gain factor value based on a corresponding value of the level of the first channel, a corresponding value of the level of the second channel, and a bias factor, andwherein the bias factor is based on a standard orientation of an audio sensing device relative to a directional information source.
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Abstract
A method for processing a multichannel audio signal may be configured to control the amplitude of one channel of the signal relative to another based on the levels of the two channels. One such example uses a bias factor, which is based on a standard orientation of an audio sensing device relative to a directional acoustic information source, for amplitude control of information segments of the signal.
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Citations
38 Claims
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1. A method of processing a multichannel audio signal, said method comprising:
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calculating a series of values of a level of a first channel of the audio signal over time; calculating a series of values of a level of a second channel of the audio signal over time; based on the series of values of a level of the first channel and the series of values of a level of the second channel, calculating a series of values of a gain factor over time; and controlling the amplitude of the second channel relative to the amplitude of the first channel over time according to the series of values of the gain factor, wherein said method includes indicating that a segment of the audio signal is an information segment, and wherein calculating a series of values of a gain factor over time includes, for at least one of the series of values of the gain factor and in response to said indicating, calculating the gain factor value based on a corresponding value of the level of the first channel, a corresponding value of the level of the second channel, and a bias factor, and wherein the bias factor is based on a standard orientation of an audio sensing device relative to a directional information source. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A computer-readable medium comprising instructions which when executed by at least one processor cause the at least one processor to perform a method of processing a multichannel audio signal, said instructions comprising:
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instructions which when executed by a processor cause the processor to calculate a series of values of a level of a first channel of the audio signal over time; instructions which when executed by a processor cause the processor to calculate a series of values of a level of a second channel of the audio signal over time; instructions which when executed by a processor cause the processor to calculating a series of values of a gain factor over time, based on the series of values of a level of the first channel and the series of values of a level of the second channel; and instructions which when executed by a processor cause the processor to control the amplitude of the second channel relative to the amplitude of the first channel over time according to the series of values of the gain factor, wherein said medium includes instructions which when executed by a processor cause the processor to indicate that a segment of the audio signal is an information segment, and wherein said instructions which when executed by a processor cause the processor to calculate a series of values of a gain factor over time include instructions which when executed by a processor cause the processor to calculate at least one of the series of values of the gain factor, in response to the indication, based on a corresponding value of the level of the first channel, a corresponding value of the level of the second channel, and a bias factor, and wherein the bias factor is based on a standard orientation of an audio sensing device relative to a directional information source. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. An apparatus for processing a multichannel audio signal, said apparatus comprising:
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means for calculating a series of values of a level of a first channel of the audio signal over time; means for calculating a series of values of a level of a second channel of the audio signal over time; means for calculating a series of values of a gain factor over time, based on the series of values of a level of the first channel and the series of values of a level of the second channel; and means for controlling the amplitude of the second channel relative to the amplitude of the first channel over time according to the series of values of the gain factor, wherein said apparatus includes means for indicating that a segment of the audio signal is an information segment, and wherein said means for calculating a series of values of a gain factor over time is configured to calculate at least one of the series of values of the gain factor, in response to the indication, based on a corresponding value of the level of the first channel, a corresponding value of the level of the second channel, and a bias factor, and wherein the bias factor is based on a standard orientation of an audio sensing device relative to a directional information source. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. An apparatus for processing a multichannel audio signal, said apparatus comprising:
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a first level calculator configured to calculate a series of values of a level of a first channel of the audio signal over time; a second level calculator configured to calculate a series of values of a level of a second channel of the audio signal over time; a gain factor calculator configured to calculate a series of values of a gain factor over time, based on the series of values of a level of the first channel and the series of values of a level of the second channel; an amplitude control element configured to control the amplitude of the second channel relative to the amplitude of the first channel over time according to the series of values of the gain factor; and an information segment indicator configured to indicate that a segment of the audio signal is an information segment, wherein said gain factor calculator is configured to calculate at least one of the series of values of the gain factor, in response to the indication, based on a corresponding value of the level of the first channel, a corresponding value of the level of the second channel, and a bias factor, and wherein the bias factor is based on a standard orientation of an audio sensing device relative to a directional acoustic information source. - View Dependent Claims (30, 31, 32, 33, 34, 35, 36, 37, 38)
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Specification