Apparatus, method for processing audio signal using correlation between bands
An audio signal, inter-band technology, applied in pulse modulation TV signal transmission, speech analysis, instruments, etc., can solve problems such as sound quality degradation
Inactive Publication Date: 2010-11-24
SAMSUNG ELECTRONICS CO LTD
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In this case, since the audio frequency bandwidth is reduced, the sound quality is reduced more
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Apparatus, method, and medium for processing an audio signal using a correlation between bands are provided. The apparatus includes an encoding unit encoding an input audio signal and a decoding unit decoding the encoded input audio signal. The encoding unit includes a correlation analyzer searching a most similar subband having a correlation of more than a predetermined value between a first subband and the most similar subband from second subbands and generating information about the second searched subband, and the decoding unit comprises a high frequency component restoring portion (copying data about the second searched subband as data about the first subband, using the generated information about the second subband generated by the correlation analyzer and transmitted in a bit stream format, to perform decoding on the first subbands, and the first subbands are subbands that belong to a high frequency band in a band of a result of subband-filtering the input audio signal and the second subbands are subbands that belong to a low frequency band in a band of the result of subband-filtering.
Description
Apparatus and method for processing audio signals using correlation between frequency bands technical field The present invention relates to audio signal processing using, for example, Motion Picture Experts Group (MPEG)-4, i.e. audio signal encoding and decoding, and more particularly relates to an apparatus and method for processing audio signals using correlation between frequency bands and medium. Background technique In conventional methods of processing audio signals such as Perceptual Noise Substitution (PNS), which is used as an MPEG-4 audio coding tool, audio signals can be efficiently processed at low bit rates such as 64kbps / stereo, but the sound quality is limited at high bit rates. rate decreased. In the conventional method, specifically, when dealing with transient audio signals, the sound quality degrades more. Also, in the conventional method, the audio signal is encoded by reducing the audio bandwidth because the number of available bits is small. In th...
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IPC IPC(8): H04N7/52G10L19/02G10L19/032
CPCG10L21/038G10L19/0204G10L19/02
Inventor 金重会金度亨李时和
Owner SAMSUNG ELECTRONICS CO LTD
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