数字电视音频子系统设计与音频处理算法研究
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摘要
数字音频已经成为数字电视产品的重要部分,因为声音是影响电视观众主观感受的关键。随着集成电路的发展,数字电视解码系统已可以集成在SoC芯片中。然而,更低的功耗和成本,更多功能的集成,仍然是数字电视SoC系统设计的挑战,音频子系统也不例外。
本文以数字电视系统中的数字音频技术为研究对象。从传统的数字电视SoC系统的解复用及音频子系统设计出发,深入讨论了新一代数字电视的多标准音频解码与处理平台的设计。在此基础上研究了多种数字音频处理技术,并且根据数字电视音频标准大多采用变换编码方式传输这一特点,提出在变换域进行低复杂度的音频处理。这些算法非常适合在数字电视SoC系统中实现。
本文取得的创新性成果包括:
1,在传统的数字电视SoC系统中实现了解复用和音频子系统的设计,并提出了一种有效的音视频同步方法。作为国产首款集成DVB-S的数字电视接收一体化SoC芯片中的重要模块,解复用和音频子系统都通过了芯片量产考验。
2,提出了一种MDCT域的正弦参数提取方法。该方法通过分析MDCT域最大值及其周围系数的符号,简化了判断正弦信号频率整数部分的方法,另外本文的补充判定方法,有效提升了频率分数部分的精确度。与同类方法相比具有复杂度低,频率判定准确率高的优点。
3,提出了一种MDCT域音频错误隐藏方法。在正弦与噪声模型的基础上,本文提出了正弦频率估计方法判断正弦分量MDCT系数的符号,可以有效改善主观听觉质量,并且运算复杂度较低。适合实时性要求高且处理能力受限的数字电视SoC系统。
4,提出了一种基于HRTF频谱特征的MDCT域滤波优化方法。较以往的MDCT域滤波方法,本文运算复杂度降低明显且主观质量一致。在此基础上,提出了本文MDCT域的虚拟环绕处理方法。各项实验结果表明,较频域滤波以及以往的MDCT域滤波方法,本文提出的MDCT域虚拟环绕处理方法,可以在较低的运算复杂度情况下,获得较好的主观感受。
Digital Audio is a core component in DTV,because audio is central to perceived quality of DTV product.With the development of integrated circuits.DTV can be integrated in the system-on-chip.The chanllenge of DTV SoC design is to integrated more features with lower cost.The audio subsystem design is of no exception.
This thesis makes research on the field of Digital Audio Technique in DTV decoding SoC.Based on the design of demultiplexer and audio subsystem,a RISC-based audio processor is adopted for multi-standard decoding and processing in a new gerneration DTV SoC.On its basis,serveal efficient audio processing algorithms are proposed in MDCT domain,which is the dominant transform method of high quality audio coding in DTV.The achievements are as follows:
1,Proposed an efficient Audio-video synchronization method in the design of demultiplexer and audio subsystem in the DTV SoC.As an important part in SoC chip of DVB-S demodulator and MPEG-2 decoder,all the design was verified by ASIC and mass production.
2,Proposed an accurate low complexity algorithm for frequency estimation in MDCT domain,The algorithm extracts integer part of frequency by estimating combinations of local maximum and neighbor of MDCT coefficients.And the fractional part of the frequency achieves accurate results by complementing method. The algorithm is superior to previous method in Sinusoid modeling of MDCT domain.
3,Proposed an efficient audio packet loss concealment method in MDCT domain. Based on Sinusoid and noise model,MDCT coefficients are divided into two groups, noise and sinusoid component.The sign of MDCT coefficients of sinusoidal component in the lost packets are reconstructed by frequency estimation.The method can improve the subjective listening quality with quite low computational cost,so can be used in DTV receiver with limited computation capacity.
4,Proposed an efficient filtering approach in MDCT domain base on the spectrum character of HRTF.On its basis,realized a virtual surround processing method in MDCT domain.Compared with previous frequency and MDCT domain methods,the proposed virtual surround processing achieves low complexity with the same quality,both in objective and subjective test.
本文以数字电视系统中的数字音频技术为研究对象。从传统的数字电视SoC系统的解复用及音频子系统设计出发,深入讨论了新一代数字电视的多标准音频解码与处理平台的设计。在此基础上研究了多种数字音频处理技术,并且根据数字电视音频标准大多采用变换编码方式传输这一特点,提出在变换域进行低复杂度的音频处理。这些算法非常适合在数字电视SoC系统中实现。
本文取得的创新性成果包括:
1,在传统的数字电视SoC系统中实现了解复用和音频子系统的设计,并提出了一种有效的音视频同步方法。作为国产首款集成DVB-S的数字电视接收一体化SoC芯片中的重要模块,解复用和音频子系统都通过了芯片量产考验。
2,提出了一种MDCT域的正弦参数提取方法。该方法通过分析MDCT域最大值及其周围系数的符号,简化了判断正弦信号频率整数部分的方法,另外本文的补充判定方法,有效提升了频率分数部分的精确度。与同类方法相比具有复杂度低,频率判定准确率高的优点。
3,提出了一种MDCT域音频错误隐藏方法。在正弦与噪声模型的基础上,本文提出了正弦频率估计方法判断正弦分量MDCT系数的符号,可以有效改善主观听觉质量,并且运算复杂度较低。适合实时性要求高且处理能力受限的数字电视SoC系统。
4,提出了一种基于HRTF频谱特征的MDCT域滤波优化方法。较以往的MDCT域滤波方法,本文运算复杂度降低明显且主观质量一致。在此基础上,提出了本文MDCT域的虚拟环绕处理方法。各项实验结果表明,较频域滤波以及以往的MDCT域滤波方法,本文提出的MDCT域虚拟环绕处理方法,可以在较低的运算复杂度情况下,获得较好的主观感受。
Digital Audio is a core component in DTV,because audio is central to perceived quality of DTV product.With the development of integrated circuits.DTV can be integrated in the system-on-chip.The chanllenge of DTV SoC design is to integrated more features with lower cost.The audio subsystem design is of no exception.
This thesis makes research on the field of Digital Audio Technique in DTV decoding SoC.Based on the design of demultiplexer and audio subsystem,a RISC-based audio processor is adopted for multi-standard decoding and processing in a new gerneration DTV SoC.On its basis,serveal efficient audio processing algorithms are proposed in MDCT domain,which is the dominant transform method of high quality audio coding in DTV.The achievements are as follows:
1,Proposed an efficient Audio-video synchronization method in the design of demultiplexer and audio subsystem in the DTV SoC.As an important part in SoC chip of DVB-S demodulator and MPEG-2 decoder,all the design was verified by ASIC and mass production.
2,Proposed an accurate low complexity algorithm for frequency estimation in MDCT domain,The algorithm extracts integer part of frequency by estimating combinations of local maximum and neighbor of MDCT coefficients.And the fractional part of the frequency achieves accurate results by complementing method. The algorithm is superior to previous method in Sinusoid modeling of MDCT domain.
3,Proposed an efficient audio packet loss concealment method in MDCT domain. Based on Sinusoid and noise model,MDCT coefficients are divided into two groups, noise and sinusoid component.The sign of MDCT coefficients of sinusoidal component in the lost packets are reconstructed by frequency estimation.The method can improve the subjective listening quality with quite low computational cost,so can be used in DTV receiver with limited computation capacity.
4,Proposed an efficient filtering approach in MDCT domain base on the spectrum character of HRTF.On its basis,realized a virtual surround processing method in MDCT domain.Compared with previous frequency and MDCT domain methods,the proposed virtual surround processing achieves low complexity with the same quality,both in objective and subjective test.
引文
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