AUDIO DECODER, METHOD AND COMPUTER PROGRAM USING A ZERO-INPUT-RESPONSE TO OBTAIN A SMOOTH TRANSITION
First Claim
1. An audio decoder for providing a decoded audio information on the basis of an encoded audio information, the audio decoder comprising:
- a linear-prediction-domain decoder configured to provide a first decoded audio information on the basis of an audio frame encoded in a linear prediction domain;
a frequency domain decoder configured to provide a second decoded audio information on the basis of an audio frame encoded in a frequency domain; and
a transition processor,wherein the transition processor is configured to obtain a zero-input-response of a linear predictive filtering, wherein an initial state of the linear predictive filtering is defined in dependence on the first decoded audio information and the second decoded audio information, andwherein the transition processor is configured to modify the second decoded audio information, which is provided on the basis of an audio frame encoded in the frequency domain following an audio frame encoded in the linear prediction domain, in dependence on the zero-input-response, to obtain a smooth transition between the first decoded audio information and the modified second decoded audio information.
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Abstract
An audio decoder for providing a decoded audio information on the basis of an encoded audio information includes a linear-prediction-domain decoder configured to provide a first decoded audio information on the basis of an audio frame encoded in a linear prediction domain, a frequency domain decoder configured to provide a second decoded audio information on the basis of an audio frame encoded in a frequency domain, and a transition processor. The transition processor is configured to obtain a zero-input-response of a linear predictive filtering, wherein an initial state of the linear predictive filtering is defined depending on the first decoded audio information and the second decoded audio information, and modify the second decoded audio information depending on the zero-input-response, to obtain a smooth transition between the first and the modified second decoded audio information.
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Citations
18 Claims
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1. An audio decoder for providing a decoded audio information on the basis of an encoded audio information, the audio decoder comprising:
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a linear-prediction-domain decoder configured to provide a first decoded audio information on the basis of an audio frame encoded in a linear prediction domain; a frequency domain decoder configured to provide a second decoded audio information on the basis of an audio frame encoded in a frequency domain; and a transition processor, wherein the transition processor is configured to obtain a zero-input-response of a linear predictive filtering, wherein an initial state of the linear predictive filtering is defined in dependence on the first decoded audio information and the second decoded audio information, and wherein the transition processor is configured to modify the second decoded audio information, which is provided on the basis of an audio frame encoded in the frequency domain following an audio frame encoded in the linear prediction domain, in dependence on the zero-input-response, to obtain a smooth transition between the first decoded audio information and the modified second decoded audio information. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method for providing a decoded audio information on the basis of an encoded audio information, the method comprising:
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providing a first decoded audio information on the basis of an audio frame encoded in a linear prediction domain; providing a second decoded audio information on the basis of an audio frame encoded in a frequency domain; and obtaining a zero-input-response of a linear predictive filtering, wherein an initial state of the linear predictive filtering is defined in dependence on the first decoded audio information and the second decoded audio information, and modifying the second decoded audio information, which is provided on the basis of an audio frame encoded in the frequency domain following an audio frame encoded in the linear prediction domain, in dependence on the zero-input-response, to obtain a smooth transition between the first decoded audio information and the modified second decoded audio information.
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18. A non-transitory digital storage medium having a computer program stored thereon to perform the method for providing a decoded audio information on the basis of an encoded audio information, the method comprising:
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providing a first decoded audio information on the basis of an audio frame encoded in a linear prediction domain; providing a second decoded audio information on the basis of an audio frame encoded in a frequency domain; and obtaining a zero-input-response of a linear predictive filtering, wherein an initial state of the linear predictive filtering is defined in dependence on the first decoded audio information and the second decoded audio information, and modifying the second decoded audio information, which is provided on the basis of an audio frame encoded in the frequency domain following an audio frame encoded in the linear prediction domain, in dependence on the zero-input-response, to obtain a smooth transition between the first decoded audio information and the modified second decoded audio information when said computer program is run by a computer.
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Specification