VOICE ENCODING DEVICE AND VOICE DECODING DEVICE, AND METHOD THEREOF

摘要

PROBLEM TO BE SOLVED: To perform scalable encoding with a small calculation quantity and a small encoded information amount. SOLUTION: This voice encoding device is configured to obtain basic layer encoded information by encoding an input signal by a basic layer encoding part 101. A basic layer decoding part 102 decodes the basic layer encoded information to obtain a basic layer decoded signal and long-period prediction information (pitch lag). An addition part 103 inverts the polarity of the basic layer decoded signal and adds it to the input signal to obtain a residue signal. An extension layer encoding part 104 encodes a long-period prediction coefficient calculated by using the long-period prediction information and residue signal to obtain layer extension layer encoded information. A basic layer decoding part 152 decodes the basic layer encoded information to obtain a basic layer decoded signal and long-period prediction information. An extension layer decoding part 153 decodes the extension layer encoded information by using the long-period prediction information to obtain an extension layer decoded signal. An addition part 154 sums the basic layer decoded signal and extension layer decoded signal to obtain a voice/musical sound signal. COPYRIGHT: (C)2005,JPO&NCIPI