Patent ID: 8838443
Filing Date: 2014-09-16
Classification: G10L

Abstract:
1. A coding apparatus comprising: a first coding section that inputs a low-frequency decoded signal of a frequency domain generated using low-frequency coded information obtained by encoding an input signal and the input signal of the frequency domain, generates a high-frequency decoded signal of the frequency domain using high-frequency coded information obtained through encoding using the low-frequency decoded signal and the input signal, generates a band extension signal using the low-frequency decoded signal and the high-frequency decoded signal and generates a difference signal between the input signal and the band extension signal; and a second coding section that encodes the difference signal to generate difference coded information, wherein: the first coding section searches a part approximate to the high-frequency part of the input signal from the low-frequency decoded signal in encoding using the low-frequency decoded signal and the input signal to thereby obtain an ideal gain that minimizes energy of the difference signal, generate the difference signal that minimizes the energy and generate the high-frequency coded information including the ideal gain.