Patent ID: 8417515
Filing Date: 2013-04-09
Classification: G10L

Abstract:
1. A coding apparatus comprising: a coder, including a processor, that codes estimated information of a high frequency band spectrum of an input signal having a wideband spectrum comprising a low frequency band spectrum and the high frequency band spectrum; and a limiter that acquires a first low frequency band spectrum in which a coded signal of the low frequency band spectrum of the input signal is decoded, and generates a second low frequency band spectrum by modifying a dynamic range of the first low frequency band spectrum to be closer to a dynamic range of a high frequency band spectrum, wherein the coder receives as input the wideband spectrum of the input signal as a reference signal, estimates, as the estimated information, a most similar spectrum to the high frequency band spectrum of the input signal using the wideband spectrum and the second low frequency band spectrum, and codes information about the estimated spectrum to supplant the high frequency band spectrum.