BANDWIDTH EXPANSION ENCODING AND DECODING METHOD CAPABLE OF NOT LOSING SOUND QUALITY AND A DEVICE THEREOF

摘要

PURPOSE: A bandwidth expansion encoding and decoding method and a device thereof are provided to encode and decode a high-frequency band signal using a low-frequency band signal.;CONSTITUTION: A domain among a frequency domain and a time domain is determined to be encoded for a signal in a lower band than a predetermined frequency. When the domain is determined as the frequency domain, the signal is quantized and encoded without loss (920, 925). When the domain is determined as the time domain, the signal is encoded by a code excited linear prediction (CELP) method (930). Information required to generate a higher signal than the predetermined frequency is encoded using the signal in the lower band than the predetermined frequency (945).;COPYRIGHT KIPO 2013;[Reference numerals] (900) Divide low frequency band signal and high frequency band signal; (905) Low frequency band signal is to be encoded in frequency domain?; (910) Convert by applying MDCT; (915) Control noise; (920) Quantize; (925) No-loss encode; (930) Code according to CELP method; (935) Convert low frequency band signal; (940) Convert high frequency band signal; (945) Encode high frequency band signal by using low frequency band signal; (950) Encode by stereo tool; (955) Perform multiplexing; (AA) Start; (BB) No; (CC) Yes; (DD) End