| Autor: |
Masahiro Serizawa, Sua Hong Neo, Chong Kok Seng, Naoya Tanaka, Toshiyuki Nomura, Kuah Kim Hann, Yuichiro Takamizawa, Takeshi Norimatsu, Mineo Tsushima, Osamu Shimada |
| Rok vydání: |
2004 |
| Předmět: |
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| Zdroj: |
Fourth International Conference on Information, Communications and Signal Processing, 2003 and the Fourth Pacific Rim Conference on Multimedia. Proceedings of the 2003 Joint. |
| DOI: |
10.1109/icics.2003.1292697 |
| Popis: |
Spectral band replication (SBR) is the bandwidth extension technology for the MPEG-4 audio extension 1 standard. Its principle is based on mapping the low-frequency portion of an audio signal coded at low bitrate to the missing high-frequency region, and uses a small amount of information embedded in the audio bitstream to shape the energy envelop and tone to a noise ratio of the mapped signals, such that they aurally resemble the high-frequency spectrum of the original signal, and thereby deliver compact disc-like listening sensation to the listeners. Low power SBR (LP-SBR) is a simplified version of the SBR technology that applies real-valued processing to all SBR modules, and applies aliasing reduction tools to suppress the resultant aliasing artifacts. LP-SBR requires 40% less computational cost compared to the original SBR. This paper describes the causes of aliasing artifacts and the principles behind the anti-aliasing solutions. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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