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1. 发明申请

US20080025195A1 OFDM SYSTEM ADAPTED TO MULTI-PROGRAM TRANSMISSION THEREFORE 审中-公开
标题翻译： OFDM系统适用于多节目传输
公开(公告)号：US20080025195A1
公开(公告)日：2008-01-31
申请号：US11550400
申请日：2006-10-17
申请人： Haiyun Yang , Dinesh Venkatachalam
发明人： Haiyun Yang , Dinesh Venkatachalam
IPC分类号： H04J11/00
CPC分类号： H04L5/0037 , H04H20/30 , H04L5/0007
摘要： An OFDM (Orthogonal frequency-division multiplexing) communication system is provided. The system includes at least two programs being simultaneously transmitted under one spectrum. Each program is respectively modulated under a different or similar scheme. Each of the at least two programs commonly share a control frame. The control frame is transmitted under a similar or more robust modulation scheme than the at least two programs' modulations respectively.
摘要翻译：提供了OFDM（正交频分复用）通信系统。该系统包括在一个频谱下同时发送的至少两个节目。每个程序分别以不同或类似的方案进行调制。至少两个程序中的每一个通常共享控制帧。控制帧分别在与至少两个程序的调制相似或更稳健的调制方案下传输。

2. 发明申请

US20090276227A1 FAST SYNTHESIS SUB-BAND FILTERING METHOD FOR DIGITAL SIGNAL DECODING 有权
标题翻译：用于数字信号解码的快速合成子带滤波方法
公开(公告)号：US20090276227A1
公开(公告)日：2009-11-05
申请号：US12501342
申请日：2009-07-10
申请人： George Sapna , Haiyun Yang
发明人： George Sapna , Haiyun Yang
IPC分类号： G10L21/00
CPC分类号： G10L19/0208 , H04H40/18
摘要： In order to reproduce audio signals which have been compressed or encoded for storage or transmission using, for example, MPEG audio encoding, a synthesis sub-band filter is employed which performs an inverse modified discrete cosine transform. The computational cost of the IMDCT implementation is reduced by pre-calculating arrays of sum and difference data. The arrays of sum and difference data are then used in two separate transform calculations, the results of which can be used in the generation of pulse code modulation audio data.
摘要翻译：为了再现使用例如MPEG音频编码进行压缩或编码以进行存储或传输的音频信号，采用执行逆修正离散余弦变换的合成子带滤波器。通过预先计算和和差数据的阵列来减少IMDCT实现的计算成本。然后将和差数据的数组用于两个单独的变换计算，其结果可用于生成脉冲编码调制音频数据。

3. 发明授权

US08301282B2 Fast synthesis sub-band filtering method for digital signal decoding 有权
标题翻译：用于数字信号解码的快速合成子带滤波方法
公开(公告)号：US08301282B2
公开(公告)日：2012-10-30
申请号：US12501342
申请日：2009-07-10
申请人： Sapna George , Haiyun Yang
发明人： Sapna George , Haiyun Yang
IPC分类号： G06F17/00
CPC分类号： G10L19/0208 , H04H40/18
摘要： In order to reproduce audio signals which have been compressed or encoded for storage or transmission using, for example, MPEG audio encoding, a synthesis sub-band filter is employed which performs an inverse modified discrete cosine transform. The computational cost of the IMDCT implementation is reduced by pre-calculating arrays of sum and difference data. The arrays of sum and difference data are then used in two separate transform calculations, the results of which can be used in the generation of pulse code modulation audio data.
摘要翻译：为了再现使用例如MPEG音频编码进行压缩或编码以进行存储或传输的音频信号，采用执行逆修正离散余弦变换的合成子带滤波器。通过预先计算和和差数据的阵列来减少IMDCT实现的计算成本。然后将和差数据的数组用于两个单独的变换计算，其结果可用于生成脉冲编码调制音频数据。

4. 发明授权

US09172505B1 Methods and apparatus for frame detection 有权
标题翻译：帧检测方法和装置
公开(公告)号：US09172505B1
公开(公告)日：2015-10-27
申请号：US13624095
申请日：2012-09-21
申请人： Haiyun Yang , Ninh D. Ngo
发明人： Haiyun Yang , Ninh D. Ngo
IPC分类号： H04L1/00 , H04L25/02
CPC分类号： H04L1/0091 , H03M13/333 , H04L1/0041 , H04L25/0262
摘要： One embodiment relates to a frame detection circuit for detecting a frame boundary. The circuit includes at least two frame buffers and a staged-parallel structure of syndrome computation circuits that computes a number of syndromes in one cycle. The two frame buffers are each one word in width. The number of syndromes computed in one cycle by the cascaded series is a fraction of a number of bits in one word. Another embodiment relates to a method for detecting a frame boundary. Another embodiment relates to a method for computing a current syndrome. Other embodiments, aspects, and features are also disclosed.
摘要翻译：一个实施例涉及用于检测帧边界的帧检测电路。该电路包括至少两个帧缓冲器和在一个周期中计算多个综合征的校正子计算电路的分段并行结构。两个帧缓冲区的宽度各为一个字。通过级联序列在一个周期中计算的综合征数量是一个字中位数的几分之一。另一实施例涉及一种用于检测帧边界的方法。另一实施例涉及一种用于计算当前综合征的方法。还公开了其它实施例，方面和特征。

5. 发明授权

US07324428B1 Frame identifier 失效
标题翻译：帧标识符
公开(公告)号：US07324428B1
公开(公告)日：2008-01-29
申请号：US10040185
申请日：2001-10-19
申请人： Haiyun Yang
发明人： Haiyun Yang
IPC分类号： H04J11/00 , H04J3/14 , H04L12/28
CPC分类号： H04L27/2656 , H04L5/026 , H04L27/2613
摘要： Method and system for determining the number of one or more of a sequence of M+1 consecutive OFDM frames from analysis of the designated preambles of two or more consecutive frames (m=0, 1, . . . , M; M≧1). An overlap function OF(m;k) is formed for each frame with a sequence of selected reference signals indexed by k (k=1, 2, . . . , K), dependent upon the frame number m and the index k, and a phase (sequence location corresponding to largest amplitude of overlap function) is determined. An Mth-order phase difference is computed that corresponds to frame number of one of the M+1 frames. A consistency check is provided for the phase numbers.
摘要翻译：用于从两个或更多个连续帧（m = 0,1，...，M; M> = 1）的指定前同步码的分析中确定M + 1个连续OFDM帧序列中的一个或多个序列的数目的方法和系统）。根据帧数m和索引k，由k（k = 1,2，...，K）索引的所选择的参考信号序列为每个帧形成重叠函数OF（m; k），并且确定相位（对应于最大幅度的重叠函数的序列位置）。计算对应于M + 1帧中的一个帧的帧号的M阶相位差。对相数进行一致性检查。

6. 发明授权

US06931291B1 Method and apparatus for frequency-domain downmixing with block-switch forcing for audio decoding functions 有权
标题翻译：用于音频解码功能的块切换强制的频域缩混的方法和装置
公开(公告)号：US06931291B1
公开(公告)日：2005-08-16
申请号：US09423413
申请日：1997-05-08
申请人： Mario Antonio Alvarez-Tinoco , Sapna George , Haiyun Yang
发明人： Mario Antonio Alvarez-Tinoco , Sapna George , Haiyun Yang
IPC分类号： H04S1/00 , G06F17/00 , G10L21/00 , H04R5/00
CPC分类号： H04S1/007 , G10L19/008 , G10L19/022
摘要： An audio decoder solution is here provided where a reduction in computing power is required. The proposed method consists of forcing the multiple output channels to only one type of inverse transformation format. A format of long transform length is more suitable for input signals whose spectrum remains stationary or quasi-stationary. This provides a greater frequency resolution, improved coding performance and a reduction of computing power required. Another format of two or more short transform lengths, possessing greater time resolution, is more desirable for rapidly changing signals with time. The computer power required for two or more short transforms should be higher than for only one transformation. The time versus frequency resolution trade-off should be considered when selecting a transform block length. Advantage is taken of human hearing behaviour to reduce the computing power of a processing engine (e.g. DSP) when downmixing from an M-channel input to a P-channel output is required. The encoder provides spectral information concerning the transmitted audio signal frame. This information corresponds to signals which are stationary/quasi-stationary or changing rapidly with time. Some analysis is required to decide which input channels are forced to long or short block conversion prior to frequency-domain downmixing and transformation.
摘要翻译：这里提供了一种需要降低计算能力的音频解码器解决方案。所提出的方法包括将多个输出通道强制为一种类型的逆变换格式。长变换长度的格式更适合于频谱保持静止或准静止的输入信号。这提供了更高的频率分辨率，改进的编码性能和减少所需的计算能力。具有更长时间分辨率的两个或多个短变换长度的另一格式对于快速变化的信号随时间而言更为理想。两个或多个短变换所需的计算机功率应高于仅一次转换。在选择变换块长度时，应考虑时间与频率分辨率的折衷。当需要从M通道输入到P沟道输出的混合时，优先采用人类听觉行为来降低处理引擎（例如DSP）的计算能力。编码器提供关于传输的音频信号帧的频谱信息。该信息对应于静止/准静止或随时间快速变化的信号。需要进行一些分析，以确定哪些输入通道在频域缩混和变换之前被强制进行长或短块转换。

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