Encoding device, encoding method, decoding device, decoding method

Abstract

An encoding apparatus includes a time-frequency transform unit that performs a time-frequency transform on an audio signal, a normalization unit that normalizes a frequency spectral coefficient obtained by the time-frequency transform in order to generate encoded data of the audio signal, a level calculation unit that calculates a level of the audio signal, a scale factor changing unit that changes a concealment scale factor included in encoded concealment data obtained by performing, on the basis of the level of the audio signal, a time-frequency transform and normalization on a minute noise signal, the concealment scale factor being a scale factor relating to a coefficient used for the normalization, and an output unit that outputs the encoded data of the audio signal generated by the normalization unit or outputs, as encoded data of the audio signal, the encoded concealment data whose concealment scale factor has been changed.

Description

technical field [0001] The present disclosure relates to an encoding device, an encoding method, a decoding device, a decoding method, and a program, and more particularly, to an encoding device, an encoding method, a decoding Devices, decoding methods, and programs. Background technique [0002] In recent years, audio signals are generally digitized, and the resulting digital signals are compressed and encoded, and then transmitted or stored. Coding of audio signals is generally classified into waveform coding and analysis / synthesis coding. Waveform coding includes band division coding and transform coding, in which an audio signal is divided into a plurality of frequency components using a band division filter and encoded, and in transform coding, a digital audio signal is subjected to time-frequency transform on a block-by-block basis and The resulting spectrum is encoded. In waveform encoding, an audio signal that has been divided into frequency components using a ban...

AI Technical Summary

Problems solved by technology

[0014] In the encoding device 10 described above, encoding errors may occur due to reasons such as the number of bits of a frame is smaller than the number of bits required for encoding or encoding takes longer than a period during which real-time processing can be performed

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