| 摘要 |
<p>An encoding device capable of considerably reducing the amount of processing operations while inhibiting output signal quality deterioration by adaptively adjusting a conversion coefficient used in a correlation operation for each process when performing the correlation operation for an input signal, wherein frequency domain converters (701, 702) acquire a conversion coefficient in which a frequency band is divided into low end and high end, a sub-band energy calculator (703) divides either the low end or the high end frequency band of the conversion coefficient into a plurality of sub-bands, an importance assessment unit (704) sets a degree of importance for each sub-band, a sparse processor (705), according to the set importance, sets the amplitude value of a specific number of conversion coefficients, from among the plurality of conversion coefficients included in each sub-band, at zero, and a correlation analysis unit (706) calculates the correlation between the corrected conversion coefficient of one frequency band and the conversion coefficient of the other frequency band.</p> |
