ENCODING DEVICE, DECODING DEVICE, AND METHODS THEREFOR
First Claim
1. A coding apparatus that includes at least two coding layers, the coding apparatus comprising:
- a first layer coding section that inputs a first input signal of a frequency domain thereto, selects a first quantization target band of the first input signal from a plurality of sub-bands into which the frequency domain is divided, encodes the first input signal of the first quantization target band to generate first coded information including first band information on the first quantization target band, generates a first decoded signal using the first coded information, and generates a second input signal using the first input signal and the first decoded signal; and
a second layer coding section that inputs the second input signal and the first decoded signal or the first coded information thereto, selects a second quantization target band of the second input signal from the plurality of sub-bands using the first decoded signal or the first coded information, encodes the second input signal of the second quantization target band, and generates second coded information including second band information on the second quantization target band.
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Accused Products
Abstract
Disclosed is an encoding device that improves the quality of a decoded signal in a hierarchical coding (scalable coding) method, wherein a band to be quantized is selected for every level (layer). The encoding device (101) is equipped with a second layer encoding unit (205) that selects a first band to be quantized of a first input signal from among a plurality of sub-bands, and that generates second layer encoding information containing first band information of said band; a second layer decoding unit (206) that generates a first decoded signal using the second layer encoding information; an addition unit (207) that generates a second input signal using the first input signal and the first decoded signal; and a third layer encoding unit (208) that selects a second band to be quantized of the second input signal using the first decoded signal, and that generates third layer encoding information.
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Citations
14 Claims
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1. A coding apparatus that includes at least two coding layers, the coding apparatus comprising:
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a first layer coding section that inputs a first input signal of a frequency domain thereto, selects a first quantization target band of the first input signal from a plurality of sub-bands into which the frequency domain is divided, encodes the first input signal of the first quantization target band to generate first coded information including first band information on the first quantization target band, generates a first decoded signal using the first coded information, and generates a second input signal using the first input signal and the first decoded signal; and a second layer coding section that inputs the second input signal and the first decoded signal or the first coded information thereto, selects a second quantization target band of the second input signal from the plurality of sub-bands using the first decoded signal or the first coded information, encodes the second input signal of the second quantization target band, and generates second coded information including second band information on the second quantization target band. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A decoding apparatus that receives and decodes information generated by a coding apparatus including at least two coding layers, the decoding apparatus comprising:
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a receiving section that receives the information including first coded information and second coded information, the first coded information being obtained by encoding a first layer of the coding apparatus, the first coded information including first band information generated by selecting a first quantization target band of the first layer from a plurality of sub-bands into which a frequency domain is divided, the second coded information being obtained by encoding a second layer of the coding apparatus using a first layer decoded signal that is generated using the first coded information, the second coded information including second band information generated by selecting a second quantization target band of the second layer from the plurality of sub-bands; a first layer decoding section that inputs the first coded information obtained from the information thereto, and generates a first decoded signal with respect to the first quantization target band set based on the first band information included in the first coded information; and a second layer decoding section that inputs the second coded information obtained from the information, and generates a second decoded signal with respect to the second quantization target band set based on the second band information included in the second coded information. - View Dependent Claims (9, 10, 11, 12)
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13. A coding method of performing encoding in at least two coding layers, comprising:
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a first layer encoding step of inputting a first input signal of a frequency domain thereto, selecting a first quantization target band of the first input signal from a plurality of sub-bands into which the frequency domain is divided, encoding the first input signal of the first quantization target band to generate first coded information including first band information on the first quantization target band, generating a first decoded signal using the first coded information, and generating a second input signal using the first input signal and the first decoded signal; and a second layer encoding step of inputting the second input signal and the first decoded signal or the first coded information thereto, selecting a second quantization target band of the second input signal from the plurality of sub-bands using the first decoded signal or the first coded information, encoding the second input signal of the second quantization target band, and generating second coded information including second band information on the second quantization target band.
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14. A decoding method of receiving and decoding information generated by a coding apparatus including at least two coding layers, comprising:
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a receiving step of receiving the information including first coded information and second coded information, the first coded information being obtained by encoding a first layer of the coding apparatus, the first coded information including first band information generated by selecting a first quantization target band of the first layer from a plurality of sub-bands into which a frequency domain is divided, the second coded information being obtained by encoding a second layer of the coding apparatus using a first layer decoded signal that is generated using the first coded information, the second coded information including second band information generated by selecting a second quantization target band of the second layer from the plurality of sub-bands; a first layer decoding step of inputting the first coded information obtained from the information thereto, and generating a first decoded signal with respect to the first quantization target band set based on the first band information included in the first coded information; and a second layer decoding step of inputting the second coded information obtained from the information, and generating a second decoded signal with respect to the second quantization target band set based on the second band information included in the second coded information.
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Specification