CONCEPT FOR ENCODING AN AUDIO SIGNAL AND DECODING AN AUDIO SIGNAL USING DETERMINISTIC AND NOISE LIKE INFORMATION
First Claim
1. An encoder for encoding an audio signal, the encoder comprising:
- an analyzer configured for deriving prediction coefficients and a residual signal from an unvoiced frame of the audio signal;
a gain parameter calculator configured for calculating a first gain parameter information for defining a first excitation signal related to a deterministic codebook and for calculating a second gain parameter information for defining a second excitation signal related to a noise-like signal for the unvoiced frame; and
a bitstream former configured for forming an output signal based on an information related to a voiced signal frame, the first gain parameter information and the second gain parameter information.
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Abstract
An encoder for encoding an audio signal has: an analyzer configured for deriving prediction coefficients and a residual signal from an unvoiced frame of the audio signal; a gain parameter calculator configured for calculating a first gain parameter information for defining a first excitation signal related to a deterministic codebook and for calculating a second gain parameter information for defining a second excitation signal related to a noise-like signal for the unvoiced frame; and a bitstream former configured for forming an output signal based on an information related to a voiced signal frame, the first gain parameter information and the second gain parameter information.
30 Citations
19 Claims
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1. An encoder for encoding an audio signal, the encoder comprising:
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an analyzer configured for deriving prediction coefficients and a residual signal from an unvoiced frame of the audio signal; a gain parameter calculator configured for calculating a first gain parameter information for defining a first excitation signal related to a deterministic codebook and for calculating a second gain parameter information for defining a second excitation signal related to a noise-like signal for the unvoiced frame; and a bitstream former configured for forming an output signal based on an information related to a voiced signal frame, the first gain parameter information and the second gain parameter information. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A decoder for decoding a received audio signal comprising an information related to prediction coefficients, the decoder comprising:
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a first signal generator configured for generating a first excitation signal from a deterministic codebook for a portion of a synthesized signal; a second signal generator configured for generating a second excitation signal from a noise-like signal for the portion of the synthesized signal; a combiner configured for combining the first excitation signal and the second excitation signal for generating a combined excitation signal for the portion of the synthesized signal; and a synthesizer configured for synthesizing the portion of the synthesized signal from the combined excitation signal and the prediction coefficients. - View Dependent Claims (13, 14)
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15. An encoded audio signal comprising an information related to prediction coefficients, an information related to a deterministic codebook, an information related to a first gain parameter and a second gain parameter and an information related to a voiced and an unvoiced signal frame.
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16. A method for encoding an audio signal, the method comprising:
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deriving prediction coefficients and a residual signal from an unvoiced frame of the audio signal; calculating a first gain parameter information for defining a first excitation signal related to a deterministic codebook and for calculating a second gain parameter information for defining a second excitation signal related to a noise-like signal for the unvoiced frame; and forming an output signal based on an information related to a voiced signal frame, the first gain parameter information and the second gain parameter information.
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17. A method for decoding a received audio signal comprising an information related to prediction coefficients, the decoder comprising:
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generating a first excitation signal from a deterministic codebook for a portion of a synthesized signal; generating a second excitation signal from a noise-like signal for the portion of the synthesized signal; combining the first excitation signal and the second excitation signal for generating a combined excitation signal for the portion of the synthesized signal; and synthesizing the portion of the synthesized signal from the combined excitation signal and the prediction coefficients.
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18. A non-transitory digital storage medium having stored thereon a computer program for executing a method for encoding an audio signal, the method comprising:
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deriving prediction coefficients and a residual signal from an unvoiced frame of the audio signal; calculating a first gain parameter information for defining a first excitation signal related to a deterministic codebook and for calculating a second gain parameter information for defining a second excitation signal related to a noise-like signal for the unvoiced frame; and forming an output signal based on an information related to a voiced signal frame, the first gain parameter information and the second gain parameter information, when running on a computer.
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19. A non-transitory digital storage medium having stored thereon a computer program for executing a method for decoding a received audio signal comprising an information related to prediction coefficients, the decoder comprising:
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generating a first excitation signal from a deterministic codebook for a portion of a synthesized signal; generating a second excitation signal from a noise-like signal for the portion of the synthesized signal; combining the first excitation signal and the second excitation signal for generating a combined excitation signal for the portion of the synthesized signal; and synthesizing the portion of the synthesized signal from the combined excitation signal and the prediction coefficients, when running on a computer.
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Specification