Signal encoding method and apparatus and signal decoding method and apparatus
AssigneeSamsung Electronics Co., Ltd.
InventorsHo-sang Sung, Ki-hyun Choo, Eun-mi Oh
Life of this patent
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Abstract
A spectrum coding method includes quantizing spectral data of a current band based on a first quantization scheme, generating a lower bit of the current band using the spectral data and the quantized spectral data, quantizing a sequence of lower bits including the lower bit of the current band based on a second quantization scheme, and generating a bitstream based on a upper bit excluding N bits, where N is 1 or greater, from the quantized spectral data and the quantized sequence of lower bits.
Claims10
A spectrum coding method comprising:
- quantizing spectral data of a non-zero band by using uniform scalar quantization (USQ);
- extracting a lower bit from the quantized spectral data;
- generating a sequence of lower bits by collecting lower bits of the quantized spectral data for all non-zero bands;
- quantizing the sequence of lower bits by using Trellis coded quantization (TCQ);
- generating a bitstream based on upper bits except for the lower bit in the quantized spectral data and the quantized sequence of lower bits,
- wherein a number of bits used for TCQ is extracted evenly from a number of bits allocated for quantization of each non-zero band, and wherein a remaining number of bits in the non-zero band is used for USQ.
A spectrum coding apparatus comprising at least one processor configured to:
- quantize spectral data of a non-zero band by using uniform scalar quantization (USQ);
- extract a lower bit from the quantized spectral data;
- generate a sequence of lower bits by collecting lower bits of the quantized spectral data for all non-zero bands;
- quantize the sequence of lower bits by using Trellis coded quantization (TCQ);
- generate a bitstream based on upper bits except for the lower bit in the quantized spectral data and the quantized sequence of lower bits,
- wherein a number of bits used for TCQ is extracted evenly from a number of bits allocated for quantization of each non-zero band, and wherein a remaining number of bits in the non-zero band is used for USQ.
Dependencies are inferred from the claim text.