A novel frame error concealment scheme is proposed to improve the decoded audio quality of the receiver for transform coded excitation（TCX）audio codec.This scheme,which is a gain control approach based on the stabil...A novel frame error concealment scheme is proposed to improve the decoded audio quality of the receiver for transform coded excitation（TCX）audio codec.This scheme,which is a gain control approach based on the stability of linear predictive coding（LPC）filter,predicts the lost frames by utilizing the linear spectrum frequency and different continuous attenuation factor of different kinds of lost frames.Signal noise ratio（SNR）test and multiple stimuli with hidden reference and anchor（MUSHRA）test are conducted to evaluate the performance of this approach in adaptive multi-rate wideband plus（AMR-WB＋）audio codec.Compared with the original frame error concealment scheme,our scheme achieves better audio recovery quality in AMR-WB＋audio codec.展开更多
LC3plus(Low Complexity Communication Codec plus)协议中规定的模式选择机制用于支持音频解码器自适应选择最优丢包隐藏技术,该部分存在复杂的数学运算以及大量数据读写操作,增加了其在CPU中的运算延时。提出了以一种硬件架构用于协...LC3plus(Low Complexity Communication Codec plus)协议中规定的模式选择机制用于支持音频解码器自适应选择最优丢包隐藏技术,该部分存在复杂的数学运算以及大量数据读写操作,增加了其在CPU中的运算延时。提出了以一种硬件架构用于协调模式选择机制内部的相关数据交互,通过计算单元复用的方式,极大减小了模块消耗的逻辑资源。对所实现的选择模块进行了功能仿真与FPGA验证,测试结果表明,所设计的硬件模块处理结果符合LC3plus协议要求,且能以较小的硬件开销获得明显的处理加速。展开更多
世界数字广播(Digital Radio Mondiale,DRM)是数字调幅广播的国际标准,其信息媒介为音频信号。介绍DRM系统中广泛采用的MPEG-4高级音频编解码(Advanced Audio Coding,AAC)标准及相关算法,包括心理声学模型、滤波、量化、无噪声编码及时...世界数字广播(Digital Radio Mondiale,DRM)是数字调幅广播的国际标准,其信息媒介为音频信号。介绍DRM系统中广泛采用的MPEG-4高级音频编解码(Advanced Audio Coding,AAC)标准及相关算法,包括心理声学模型、滤波、量化、无噪声编码及时域噪声整形的实现原理,分析音频解码的基本流程。在工程应用阶段,为了优化硬件接收器的设计方法,利用C++语言编写接收器软件,用于模拟硬件设备的功能。经测试,该软件工具能够有效解码DRM音频信息。展开更多
基金Supported by the National High Technology Research and Development Program of China(863 Program)(2015AA016306)the Foundation of Outstanding Middle-aged and Young Scientific and Technological Innovation Team Program of Department of Education of Hubei Province(T201516)the Foundation of Department of Education of Hubei Province(Q20132207)
文摘A novel frame error concealment scheme is proposed to improve the decoded audio quality of the receiver for transform coded excitation（TCX）audio codec.This scheme,which is a gain control approach based on the stability of linear predictive coding（LPC）filter,predicts the lost frames by utilizing the linear spectrum frequency and different continuous attenuation factor of different kinds of lost frames.Signal noise ratio（SNR）test and multiple stimuli with hidden reference and anchor（MUSHRA）test are conducted to evaluate the performance of this approach in adaptive multi-rate wideband plus（AMR-WB＋）audio codec.Compared with the original frame error concealment scheme,our scheme achieves better audio recovery quality in AMR-WB＋audio codec.
文摘LC3plus(Low Complexity Communication Codec plus)协议中规定的模式选择机制用于支持音频解码器自适应选择最优丢包隐藏技术,该部分存在复杂的数学运算以及大量数据读写操作,增加了其在CPU中的运算延时。提出了以一种硬件架构用于协调模式选择机制内部的相关数据交互,通过计算单元复用的方式,极大减小了模块消耗的逻辑资源。对所实现的选择模块进行了功能仿真与FPGA验证,测试结果表明,所设计的硬件模块处理结果符合LC3plus协议要求,且能以较小的硬件开销获得明显的处理加速。
文摘世界数字广播(Digital Radio Mondiale,DRM)是数字调幅广播的国际标准,其信息媒介为音频信号。介绍DRM系统中广泛采用的MPEG-4高级音频编解码(Advanced Audio Coding,AAC)标准及相关算法,包括心理声学模型、滤波、量化、无噪声编码及时域噪声整形的实现原理,分析音频解码的基本流程。在工程应用阶段,为了优化硬件接收器的设计方法,利用C++语言编写接收器软件,用于模拟硬件设备的功能。经测试,该软件工具能够有效解码DRM音频信息。
