Coding model selection
First Claim
1. An apparatus, comprising:
- an input unit, configured to receive frames of an audio signal,a long term prediction analysis block, configured to perform a long term prediction analysis on the frames of the audio signal and to form long term prediction parameters based on properties of the audio signal,a first excitation block, configured to perform a first excitation for frames of the audio signal,a second excitation block, configured to perform a second excitation for frames of the audio signal,a parameter analysis block, configured to analyze said long term prediction parameters, andan excitation selection block, configured to select, based on the parameter analysis by said parameter analysis block, one excitation block among said first excitation block and said second excitation block for performing the excitation for encoding the frames of the audio signal.
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Abstract
The invention relates to an encoder (200) comprising an input (201) for inputting frames of an audio signal, a LTP analysis block (209) for performing a LTP analysis of the frames of the audio signal to form LTP parameters on the basis of the properties of the audio signal, and at least a first excitation block (206) for performing a first excitation for frames of the audio signal, and a second excitation block (207) for performing a second excitation for frames of the audio signal. The encoder (200) further comprises a parameter analysis block (202) for analysing said LTP parameters, and an excitation selection block (203) for selecting one excitation block among said first excitation block (206) and said second excitation block (207) for performing the excitation for the frames of the audio signal on the basis of the parameter analysis. The invention also relates to a device, a system, a method, a module and a computer program product.
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Citations
52 Claims
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1. An apparatus, comprising:
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an input unit, configured to receive frames of an audio signal, a long term prediction analysis block, configured to perform a long term prediction analysis on the frames of the audio signal and to form long term prediction parameters based on properties of the audio signal, a first excitation block, configured to perform a first excitation for frames of the audio signal, a second excitation block, configured to perform a second excitation for frames of the audio signal, a parameter analysis block, configured to analyze said long term prediction parameters, and an excitation selection block, configured to select, based on the parameter analysis by said parameter analysis block, one excitation block among said first excitation block and said second excitation block for performing the excitation for encoding the frames of the audio signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A device comprising an encoder, said encoder comprising:
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an input unit, configured to receive frames of an audio signal, a long term prediction analysis block, configured to perform a long term prediction analysis on the frames of the audio signal and to form long term prediction parameters based on properties of the audio signal, a first excitation block, configured to perform a first excitation for frames of the audio signal, a second excitation block, configured to perform a second excitation for frames of the audio signal, a parameter analysis block, configured to analyze said long term prediction parameters, and an excitation selection block, configured to select, based on the parameter analysis by said parameter analysis block, one excitation block among said first excitation block and said second excitation block for performing the excitation for encoding the frames of the audio signal. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A system comprising an encoder, said encoder comprising:
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an input unit, configured to receive frames of an audio signal, a long term prediction analysis block, configured to perform a long term prediction analysis on the frames of the audio signal and to form long term prediction parameters based on the properties of the audio signal, a first excitation block, configured to perform a first excitation for frames of the audio signal, a second excitation block, configured to perform a second excitation for frames of the audio signal, a parameter analysis block, configured to analyze said long term prediction parameters, and an excitation selection block, configured to select, based on the parameter analysis by said parameter analysis block, one excitation block among said first excitation block and said second excitation block for performing the excitation for encoding the frames of the audio signal. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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30. A method, comprising:
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receiving frames of an audio signal in an apparatus, said apparatus performing a long term prediction analysis on the frames of the audio signal for forming long term prediction parameters based on properties of the audio signal, said apparatus analyzing said long term prediction parameters, and said apparatus based on the analysis of the long term prediction parameters, selecting one excitation method among a first excitation method and a second excitation method for performing an excitation for encoding the frames of the audio signal. - View Dependent Claims (31, 32, 33, 34, 35, 36)
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37. A device, comprising:
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a long term prediction analysis block, configured to perform a long term prediction analysis on frames of an audio signal to form long term prediction parameters based on properties of the audio signal, a parameter analysis block, configured to analyze said long term prediction parameters, and an excitation selection block, configured to select one excitation block among a first excitation block and a second excitation block, and for indicating a selected excitation block to an encoder, wherein said frames of the audio signal are encoded by the encoder using excitation parameters output by the selected excitation block. - View Dependent Claims (38, 39, 40, 41, 42, 43, 44, 45)
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46. A computer readable storage medium stored with code thereon for use by an encoder, which when executed by a processor, causes the encoder to perform:
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receiving frames of an audio signal, performing a long term prediction analysis to frames of the audio signal and forming long term prediction parameters based on properties of the signal, analyzing said long term prediction parameters, and selecting, based on the analysis of said long term prediction parameters, one excitation method among a first excitation method and a second excitation method for performing an excitation for encoding the frames of the audio signal. - View Dependent Claims (47, 48, 49, 50, 51, 52)
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Specification