Encoding apparatus, encoding method, and program

摘要

An encoding apparatus includes a noise detector configured to detect noise included in a certain band in accordance with an audio signal, a gain controller configured to perform gain control on the audio signal so that components in the certain band of the audio signal are attenuated when the noise is detected by the noise detector, a bit allocation calculation unit configured to calculate the numbers of bits to be allocated to frequency spectra of the audio signal which have been subjected to the gain control performed by the gain controller in accordance with the frequency spectra, and a quantization unit configured to quantize the frequency spectra of the audio signal which have been subjected to the gain control in accordance with the numbers of the bits.

主权项

1. An encoding apparatus comprising:
a noise detector configured to detect noise included in a certain band in accordance with an audio signal; a gain controller configured to perform gain control on the audio signal so that components in the certain band of the audio signal are attenuated when the noise is detected by the noise detector; a bit allocation calculation unit configured to calculate the numbers of bits to be allocated to frequency spectra of the audio signal which have been subjected to the gain control performed by the gain controller in accordance with the frequency spectra; and a quantization unit configured to quantize the frequency spectra of the audio signal which have been subjected to the gain control in accordance with the numbers of the bits, wherein the noise is included in the certain band and has tendency of monotonic increase, and the noise detector detects the noise when sums of powers of groups of the frequency spectra in the certain band are monotonically increased, and wherein the noise detector, the gain controller, the bit allocation calculation unit, and the quantization unit are each implemented via a processor.