US 2010/0169081 A1 · ENCODING DEVICE, DECODING DEVICE, AND METHOD THEREOF

Abstract

An encoding device includes: a frequency region converter which converts an inputted audio signal into a frequency region; a band selector which selects a quantization object band from a plurality of sub bands obtained by dividing the frequency region; and a shape quantizer which quantizes the shape of the frequency region parameter of the quantization object band. When a prediction encoding presence/absence determiner determines that the number of common sub bands between the quantization object band and the quantization object band selected in the past is not smaller than a predetermined value, a gain quantizer performs prediction encoding on the gain of the frequency region parameter of the quantization object band. When the number of common sub bands is smaller than the predetermined value, the gain quantizer non-predictively encodes the gain of the frequency region parameter of the quantization object band.

Claims22

Dependent claims

An encoding apparatus, comprising:

a transformer that transforms an input signal to a frequency domain to obtain a frequency domain parameter;
a selector that selects a quantization target band from among a plurality of subbands obtained by dividing the frequency domain, and generates band information indicating the quantization target band;
a shape quantizer that quantizes a shape of the frequency domain parameter in the quantization target band;
and
a gain quantizer that encodes a gain of a frequency domain parameter in the quantization target band to obtain gain encoded information.

2 more elements

A decoding apparatus, comprising:

a receiver that receives information indicating a quantization target band selected from among a plurality of subbands obtained by dividing a frequency domain of an input signal;
a shape dequantizer that decodes shape encoded information in which a shape of a frequency domain parameter in the quantization target band is quantized, to generate a decoded shape;
a gain dequantizer that decodes gain encoded information in which a gain of a frequency domain parameter in the quantization target band is quantized, to generate a decoded gain, and decodes a frequency parameter using the decoded shape and the decoded gain to generate a decoded frequency domain parameter;
and
a time domain transformer that transforms the decoded frequency domain parameter to the time domain and obtains a time domain decoded signal.

2 more elements

Dependencies are inferred from the claim text.

Encoding device, decoding device, and method thereof

Life of this patent

Encoding device, decoding device, and method thereof

Life of this patent

Abstract

Claims22