SPEECH ENCODING DEVICE, SPEECH DECODING DEVICE, SPEECH ENCODING METHOD, AND SPEECH DECODING METHOD

摘要

Provided is a speech encoding device that is capable of performing encoding in an extension encoder even when the core encoder and core decoder of each layer have been interchanged, and that is also capable of performing high precision encoding by using the appropriate codec for each situation. The speech encoding device (100) performs hierarchical encoding of a speech signal by using the information of a lower layer in a higher layer. A core encoder (102) in the speech encoding device (100) generates a code by encoding the speech signal. A core decoder (104) generates a decoded signal by decoding the code generated by the core encoder (102). An adding unit (106) detects the encoding residual between the speech signal and the decoded signal generated by the core decoder (104). An auxiliary analyzing unit (107) inputs the decoded signal and generates lower layer information by conducting analysis processing and adjustment processing. An extension encoder (108) encodes the encoding residual using the speech signal and the lower layer information.