Method and apparatus for encoding and decoding audio signal using complex polar quantizer
AssigneeElectronics and Telecommunications Research Institute
InventorsByeong Ho Cho, Seung Kwon Beack, Jong Mo Sung, Tae Jin Lee, Woo Taek Lim, In Seon Jang
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Abstract
A complex number quantization-based audio signal encoding method may comprise: estimating a scale factor for each subband of an input audio signal; performing complex magnitude scaling for each subband based on the scale factor; and performing polar quantization on a complex frequency coefficient for each subband, wherein the performing the polar quantization for each subband comprises applying two or more different magnitude quantization techniques based on the magnitude of the complex frequency coefficient scaled for each subband.
Claims20
A complex number quantization-based audio signal encoding method comprising:
- estimating a scale factor for each subband of an input audio signal;
- performing complex magnitude scaling for each subband based on the scale factor;
- and
- performing polar quantization on a complex frequency coefficient for each subband,
- wherein the performing the polar quantization for each subband comprises applying two or more different magnitude quantization techniques based on the magnitude of the complex frequency coefficient scaled for each subband.
A complex number quantization-based audio signal decoding method comprising:
- determining one of two or more different magnitude inverse quantization modes by comparing a decoded magnitude quantization index for an audio signal with a threshold value;
- performing magnitude inverse polar quantization on the magnitude quantization index based on the determined magnitude inverse quantization mode;
- performing phase inverse polar quantization on a decoded phase quantization index for the audio signal;
- and
- generating an inverse polar quantized complex coefficient for the audio signal by combining the magnitude inverse polar quantization result and the phase inverse polar quantization result.
A complex number quantization-based audio signal decoding apparatus comprising:
- an inverse polar quantizer performing inverse polar quantization on an audio signal,
- wherein the inverse polar quantizer is configured to:
- determine one of two or more different magnitude inverse quantization modes by comparing a decoded magnitude quantization index for the audio signal;
- perform magnitude inverse polar quantization on the magnitude quantization index based on the determined magnitude inverse quantization mode;
- perform phase inverse polar quantization on a decoded phase quantization index for the audio signal;
- and
- generate an inverse quantized complex coefficient for the audio signal by combining the magnitude inverse polar quantization result and the phase inverse polar quantization result.
Dependencies are inferred from the claim text.