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Controlling a noise-shaping feedback loop in a digital audio signal encoder avoiding instability risk of the feedback
Controlling a noise-shaping feedback loop in a digital audio signal encoder avoiding instability risk of the feedback
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机译:控制数字音频信号编码器中的噪声整形反馈环路,避免了反馈的不稳定风险
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摘要
A method and apparatus are provided for controlling the shaping of encoding noise during the ADPCM encoding of a digital audio input signal. The noise-shaping is carried out through the use of feedback that comprises filtering noise. The method includes the following steps: obtaining a parameter for indicating a high spectral dynamic range of the signal, the parameter indicating a risk of instability of the feedback; detecting a risk of instability by comparing the indication parameter to at least one predetermined threshold; limiting the feedback in the event that a risk of instability is detected; and gradually reactivating the feedback over a predetermined number of frames subsequent to the current frame for which the feedback is limited. Also provided is an encoder with feedback, including a control module implementing the control method as described.
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