DEVICE TO RESTORE MULTI-CHANNEL AUDIO SIGNAL BY USING HE-AAC DECODER AND MPEG SURROUND DECODER

• Main Authors: KIM JIN-WOONG, JANG IN-SONG, HONG JIN-WOO, JANG DAE-YONG, BAEK SON-KWON, SEO JONG-IL
• Format: Patent
• Language: English
• Published: 16.08.2012
• Subjects: ACOUSTICS; ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; MUSICAL INSTRUMENTS; PHYSICS; SPEECH ANALYSIS OR SYNTHESIS; SPEECH OR AUDIO CODING OR DECODING; SPEECH OR VOICE PROCESSING; SPEECH RECOGNITION; STEREOPHONIC SYSTEMS

PROBLEM TO BE SOLVED: To provide a method in an MPEG surround decoder, which adjusts a delay according to a type of a down-mix audio signal and controls synchronization between a down-mix signal and an MPEG surround additional information signal.SOLUTION: In restoring a multi-channel audio signal by using an MPEG surround low-power decoder, a method according to the present invention is provided with delay means to compensate a delay generated at a real/complex converter when a QMF signal in the complex number region output from a general HE-AAC decoder is used as a down-mix signal. The method is also provided with delay means to delay a space parameter for compensating a delay generated during a processes of a QMF and a Nyquist filter bank when a down-mix signal in a time region output from the HE-AAC decoder is used together. In addition, in restoring the multi-channel audio signal by using an MPEG surround decoder in a high quality mode, the method uses a delay unit to compensate the delay generated at the real/complex converter.