Apparatus and method for generating a frequency enhanced signal using temporal smoothing of subbands
First Claim
1. An apparatus for generating a frequency enhancement audio signal, comprising:
- a signal generator configured for generating the frequency enhancement audio signal from a core audio signal, the frequency enhancement audio signal comprising an enhancement frequency range not comprised in the core audio signal, wherein a current time portion of the frequency enhancement audio signal or the core audio signal comprises subband signals for a plurality of subbands; and
a controller configured for calculating the same smoothing information for the plurality of subband signals of the enhancement frequency range or the core audio signal, andwherein the signal generator is configured for smoothing the plurality of subband signals of the enhancement frequency range or the core audio signal using the same smoothing information,wherein the controller is configured to calculate the same smoothing information using a combined energy of the plurality of subband signals of the core audio signal and the frequency enhancement audio signal or using the combined energy of the plurality of subband signals of only the frequency enhancement audio signal of the current time portion, andwherein the controller is configured to use an average energy of the plurality of subband signals of the core audio signal and the frequency enhancement audio signal or of the core audio signal only of one or more earlier time portions preceding the current time portion or one or more later time portions following the current time portion,wherein at least one of the controller and the signal generator comprises a hardware implementation.
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Abstract
An apparatus for generating a frequency enhancement signal has: a signal generator for generating an enhancement signal from a core signal, the enhancement signal having an enhancement frequency range not included in the core signal, wherein a current time portion of the enhancement signal or the core signal has subband signals for a plurality of subbands; a controller for calculating the same smoothing information for the plurality of subband signals of the enhancement frequency range or the core signal, and wherein the signal generator is configured for smoothing the plurality of subband signals of the enhancement frequency range or the core signal using the same smoothing information.
35 Citations
14 Claims
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1. An apparatus for generating a frequency enhancement audio signal, comprising:
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a signal generator configured for generating the frequency enhancement audio signal from a core audio signal, the frequency enhancement audio signal comprising an enhancement frequency range not comprised in the core audio signal, wherein a current time portion of the frequency enhancement audio signal or the core audio signal comprises subband signals for a plurality of subbands; and a controller configured for calculating the same smoothing information for the plurality of subband signals of the enhancement frequency range or the core audio signal, and wherein the signal generator is configured for smoothing the plurality of subband signals of the enhancement frequency range or the core audio signal using the same smoothing information, wherein the controller is configured to calculate the same smoothing information using a combined energy of the plurality of subband signals of the core audio signal and the frequency enhancement audio signal or using the combined energy of the plurality of subband signals of only the frequency enhancement audio signal of the current time portion, and wherein the controller is configured to use an average energy of the plurality of subband signals of the core audio signal and the frequency enhancement audio signal or of the core audio signal only of one or more earlier time portions preceding the current time portion or one or more later time portions following the current time portion, wherein at least one of the controller and the signal generator comprises a hardware implementation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 11)
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10. A method of generating a frequency enhancement audio signal, comprising:
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generating, by a signal generator, the frequency enhancement audio signal from a core audio signal, the frequency enhancement audio signal comprising an enhancement frequency range not comprised in the core audio signal, wherein a current time portion of the frequency enhancement audio signal or the core audio signal comprises subband signals for a plurality of subbands; calculating, by a controller, the same smoothing information for the plurality of subband signals of the enhancement frequency range or the core audio signal, and wherein the generating comprises smoothing the plurality of subband signals of the enhancement frequency range or the core audio signal using the same smoothing information, wherein the calculating comprises calculating the same smoothing information using a combined energy of the plurality of subband signals of the core audio signal and the frequency enhancement audio signal or using the combined energy of the plurality of subband signals of only the frequency enhancement audio signal of the current time portion, and wherein the calculating comprises using an average energy of the plurality of subband signals of the core audio signal and the frequency enhancement audio signal or of the core audio signal only of one or more earlier time portions preceding the current time portion or one or more later time portions following the current time portion, wherein at least one of the controller and the signal generator comprises a hardware implementation.
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12. A method of processing audio signals, comprising:
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generating, by an encoder, an encoded core audio signal; and generating, by an apparatus, a frequency enhancement audio signal using a method of generating the frequency enhancement audio signal, the method of generating the frequency enhancement audio signal comprising; generating the frequency enhancement audio signal from a core audio signal, the frequency enhancement audio signal comprising an enhancement frequency range not comprised in the core audio signal, wherein a current time portion of the frequency enhancement audio signal or the core audio signal comprises subband signals for a plurality of subbands; calculating the same smoothing information for the plurality of subband signals of the enhancement frequency range or the core audio signal, and wherein the generating comprises smoothing the plurality of subband signals of the enhancement frequency range or the core audio signal using the same smoothing information, wherein the calculating comprises calculating the same smoothing information using a combined energy of the plurality of subband signals of the core audio signal and the frequency enhancement audio signal or using the combined energy of the plurality of subband signals of only the frequency enhancement audio signal of the current time portion, and wherein the calculating comprises using an average energy of the plurality of subband signals of the core audio signal and the frequency enhancement audio signal or of the core audio signal only of one or more earlier time portions preceding the current time portion or one or more later time portions following the current time portion, wherein at least one of the encoder and the apparatus comprises a hardware implementation.
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13. A non-transitory storage medium having stored thereon a computer program for performing, when running on a computer or a processor, a method of generating a frequency enhancement audio signal, the method comprising:
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generating the frequency enhancement audio signal from a core audio signal, the frequency enhancement audio signal comprising an enhancement frequency range not comprised in the core audio signal, wherein a current time portion of the frequency enhancement audio signal or the core audio signal comprises subband signals for a plurality of subbands; calculating the same smoothing information for the plurality of subband signals of the enhancement frequency range or the core audio signal, and wherein the generating comprises smoothing the plurality of subband signals of the enhancement frequency range or the core audio signal using the same smoothing information, wherein the calculating comprises calculating the same smoothing information using a combined energy of the plurality of subband signals of the core audio signal and the frequency enhancement audio signal or using the combined energy of the plurality of subband signals of only the frequency enhancement audio signal of the current time portion, and wherein the calculating comprises using an average energy of the plurality of subband signals of the core audio signal and the frequency enhancement audio signal or of the core audio signal only of one or more earlier time portions preceding the current time portion or one or more later time portions following the current time portion.
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14. A non-transitory storage medium having stored thereon a computer program for performing, when running on a computer or a processor, the method of processing audio signals comprising:
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generating an encoded core audio signal; and generating a frequency enhancement audio signal using a method of generating the frequency enhancement audio signal, the method of generating the frequency enhancement audio signal comprising; generating the frequency enhancement audio signal from a core audio signal, the frequency enhancement audio signal comprising an enhancement frequency range not comprised in the core audio signal, wherein a current time portion of the frequency enhancement audio signal or the core audio signal comprises subband signals for a plurality of subbands; calculating the same smoothing information for the plurality of subband signals of the enhancement frequency range or the core audio signal, and wherein the generating comprises smoothing the plurality of subband signals of the enhancement frequency range or the core audio signal using the same smoothing information, wherein the calculating comprises calculating the same smoothing information using a combined energy of the plurality of subband signals of the core audio signal and the frequency enhancement audio signal or using only the frequency enhancement audio signal of the current time portion, and wherein the calculating comprises using an average energy of the plurality of subband signals of the core audio signal and the frequency enhancement audio signal or of the core audio signal only of one or more earlier time portions preceding the current time portion or one or more later time portions following the current time portion.
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Specification