发明授权
- 专利标题: Reconstruction of a high-frequency range in low-bitrate audio coding using predictive pattern analysis
- 专利标题(中): 使用预测模式分析重建低位音频编码中的高频范围
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申请号: US14084479申请日: 2013-11-19
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公开(公告)号: US09373337B2公开(公告)日: 2016-06-21
- 发明人: Pavel Chubarev , Dmitry Shmunk
- 申请人: DTS, INC.
- 申请人地址: US CA Calabasas
- 专利权人: DTS, INC.
- 当前专利权人: DTS, INC.
- 当前专利权人地址: US CA Calabasas
- 代理商 Craig S. Fischer
- 主分类号: G10L19/06
- IPC分类号: G10L19/06 ; G10L19/02 ; G10L19/00 ; G10L19/04 ; G10L21/038
摘要:
A predictive pattern high-frequency reconstruction system and method that finds patterns in high-frequency components of an audio signal, encodes the audio signal into an encoded bitstream along with pattern information, and then uses the patterns to reconstruct the high-frequency components during decoding. The high-frequency components can be reconstructed using the pattern information alone. Embodiments of the system and method map normalized subband signals of the audio signal to a scaled representation of a time-frequency grid containing multiple tiles and perform statistical analysis on each tile to estimate subband parameters and determine whether a pattern exists. If a pattern does exist, it can be encoded in the encoded bitstream, transmitted, and used to reconstruct the high-frequency components at the decoder. A direct search technique and a fast Fourier transform (FFT) technique may be used to perform the statistical analysis.
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