CONCEPT FOR ENCODING AN AUDIO SIGNAL AND DECODING AN AUDIO SIGNAL USING SPEECH RELATED SPECTRAL SHAPING INFORMATION
First Claim
1. An encoder for encoding an audio signal, the encoder comprisingan analyzer configured for deriving prediction coefficients and a residual signal from a frame of the audio signal;
- a formant information calculator configured for calculating a speech related spectral shaping information from the prediction coefficients;
a gain parameter calculator configured for calculating a gain parameter from an unvoiced residual signal and the spectral shaping information; and
a bitstream former configured for forming an output signal based on an information related to a voiced signal frame, the gain parameter or a quantized gain parameter and the prediction coefficients.
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Abstract
According to an aspect of the present invention an encoder for encoding an audio signal has an analyzer configured for deriving prediction coefficients and a residual signal from a frame of the audio signal. The encoder has a formant information calculator configured for calculating a speech related spectral shaping information from the prediction coefficients, a gain parameter calculator configured for calculating a gain parameter from an unvoiced residual signal and the spectral shaping information and a bitstream former configured for forming an output signal based on an information related to a voiced signal frame, the gain parameter or a quantized gain parameter and the prediction coefficients.
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Citations
17 Claims
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1. An encoder for encoding an audio signal, the encoder comprising
an analyzer configured for deriving prediction coefficients and a residual signal from a frame of the audio signal; -
a formant information calculator configured for calculating a speech related spectral shaping information from the prediction coefficients; a gain parameter calculator configured for calculating a gain parameter from an unvoiced residual signal and the spectral shaping information; and a bitstream former configured for forming an output signal based on an information related to a voiced signal frame, the gain parameter or a quantized gain parameter and the prediction coefficients. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A decoder for decoding a received signal comprising information related to prediction coefficients, the decoder comprising
a formant information calculator configured for calculating a speech related spectral shaping information from the prediction coefficients; -
a noise generator configured for generating a decoding noise-like signal; a shaper configured for shaping a spectrum of the decoding noise-like signal or an amplified representation thereof using the spectral shaping information to acquire a shaped decoding noise-like signal; and a synthesizer configured for synthesizing a synthesized signal from the amplified shaped encoding noise-like signal and the prediction coefficients. - View Dependent Claims (11, 12)
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13. An encoded audio signal comprising prediction coefficient information for a voiced frame and an unvoiced frame, a further information related to the voiced signal frame and an information related to a gain parameter or a quantized gain parameter for the unvoiced frame.
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14. A method for encoding an audio signal, comprising
deriving prediction coefficients and a residual signal from an audio signal frame; -
calculating a speech related spectral shaping information from the prediction coefficients; calculating a gain parameter from an unvoiced residual signal and the spectral shaping information; and forming an output signal based on an information related to a voiced signal frame, the gain parameter or a quantized gain parameter and the prediction coefficients.
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15. A method for decoding a received audio signal comprising an information related prediction coefficients and a gain parameter, the method comprising
calculating a speech related spectral shaping information from the prediction coefficients; -
generating a decoding noise-like signal; shaping a spectrum of the decoding noise-like signal or an amplified representation thereof using the spectral shaping information to acquire a shaped decoding noise-like signal; and synthesizing a synthesized signal from the amplified shaped encoding noise-like signal and the prediction coefficients.
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16. A non-transitory digital storage medium having stored thereon a computer program for performing a method for encoding an audio signal, comprising
deriving prediction coefficients and a residual signal from an audio signal frame; -
calculating a speech related spectral shaping information from the prediction coefficients; calculating a gain parameter from an unvoiced residual signal and the spectral shaping information; and forming an output signal based on an information related to a voiced signal frame, the gain parameter or a quantized gain parameter and the prediction coefficients, when said computer program is run by a computer.
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17. A non-transitory digital storage medium having stored thereon a computer program for performing a method for decoding a received audio signal comprising an information related prediction coefficients and a gain parameter, the method comprising
calculating a speech related spectral shaping information from the prediction coefficients; -
generating a decoding noise-like signal; shaping a spectrum of the decoding noise-like signal or an amplified representation thereof using the spectral shaping information to acquire a shaped decoding noise-like signal; and synthesizing a synthesized signal from the amplified shaped encoding noise-like signal and the prediction coefficients, when said computer program is run by a computer.
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Specification