公开(公告)号：US20060193373A1

公开(公告)日：2006-08-31

申请号：US11409437

申请日：2006-04-21

申请人： Brian Agee ,  Matthew Bromberg ,  Derek Gerlach ,  David Gibbons ,  James Golden ,  Minnie Ho ,  Elliott Hoole ,  Mary Jesse ,  Robert Maxwell ,  Robert Mechaley ,  Robert Naish ,  David Nix ,  David Ryan ,  David Stephenson

发明人： Brian Agee ,  Matthew Bromberg ,  Derek Gerlach ,  David Gibbons ,  James Golden ,  Minnie Ho ,  Elliott Hoole ,  Mary Jesse ,  Robert Maxwell ,  Robert Mechaley ,  Robert Naish ,  David Nix ,  David Ryan ,  David Stephenson

IPC分类号： H04B1/707 ,  H04K1/10

CPC分类号： H04B1/69 ,  H04B1/692 ,  H04B1/707 ,  H04B1/7107 ,  H04B7/04 ,  H04B2201/70702 ,  H04L5/0021 ,  H04L5/0026 ,  H04L5/0048 ,  H04L5/026 ,  H04L25/0228 ,  H04L25/03019 ,  H04L27/186 ,  H04L27/3416 ,  H04L2025/03414 ,  H04L2025/03426 ,  H04W16/14 ,  H04W88/08

摘要： A discrete multitone stacked-carrier spread spectrum communication method is based on frequency domain spreading including multiplication of a baseband signal by a set of superimposed, or stacked, complex sinusoid carrier waves. In a preferred embodiment, the spreading involves energizing the bins of a large Fast Fourier transform (FFT). This provides a considerable savings in computational complexity for moderate output FFT sizes. Point-to-multipoint and multipoint-to-multipoint (nodeless) network topologies are possible. A code-nulling method is included for interference cancellation and enhanced signal separation by exploiting the spectral diversity of the various sources. The basic method may be extended to include multielement antenna array nulling methods for interference cancellation and enhanced signal separation using spatial separation. Such methods permit directive and retrodirective transmission systems that adapt or can be adapted to the radio environment. Such systems are compatible with bandwidth-on-demand and higher-order modulation formats and use advanced adaptation algorithms. In a specific embodiment the spectral and spatial components of the adaptive weights are calculated in a unified operation based on the mathematical analogy between the spectral and spatial descriptions of the airlink.

摘要翻译： 离散多媒体叠层载波扩频通信方法是基于频域扩展，包括基带信号乘以叠加的或叠加的复数正弦波载波的集合。 在优选实施例中，扩展涉及激励大的快速傅立叶变换（FFT）的信息仓。 这为中等输出FFT大小节省了大量的计算复杂度。 点对多点和多点到多点（无节点）网络拓扑是可能的。 通过利用各种光源的光谱多样性，可以包括一个代码归零方法用于干扰消除和增强的信号分离。 基本方法可以扩展为包括用于干扰消除的多元天线阵列归零方法和使用空间分离的增强信号分离。 这种方法允许适应或可以适应于无线电环境的指导和逆向传输系统。 这样的系统与带宽按需和高阶调制格式兼容，并且使用高级适配算法。 在具体实施例中，基于空中链路的频谱和空间描述之间的数学类比，以统一的操作计算自适应权重的频谱和空间分量。

公开(公告)号：US06678658B1

公开(公告)日：2004-01-13

申请号：US09612026

申请日：2000-07-07

申请人： John Hogden ,  David Nix

发明人： John Hogden ,  David Nix

IPC分类号： G10L1506

CPC分类号： G10L15/063 ,  G10L15/14

摘要： A computer implemented method enables the recognition of speech and speech characteristics. Parameters are initialized of first probability density functions that map between the symbols in the vocabulary of one or more sequences of speech codes that represent speech sounds and a continuity map. Parameters are also initialized of second probability density functions that map between the elements in the vocabulary of one or more desired sequences of speech transcription symbols and the continuity map. The parameters of the probability density functions are then trained to maximize the probabilities of the desired sequences of speech-transcription symbols. A new sequence of speech codes is then input to the continuity map having the trained first and second probability function parameters. A smooth path is identified on the continuity map that has the maximum probability for the new sequence of speech codes. The probability of each speech transcription symbol for each input speech code can then be output.

摘要翻译： 计算机实现的方法能够识别语音和语音特征。 初始化第一概率密度函数的参数，其映射在表示语音的一个或多个语音代码序列的词汇表中的符号和连续性映射之间。 第二概率密度函数的参数也被初始化，该功能在一个或多个期望的语音转录符号序列的词汇表中的元素和连续性映射之间进行映射。 然后训练概率密度函数的参数以使语音转录符号的期望序列的概率最大化。 然后，将新的语音码序列输入具有训练的第一和第二概率函数参数的连续性映射。 在连续性图上识别出具有新的语音码序列的最大概率的平滑路径。 然后可以输出每个输入语音代码的每个语音转录符号的概率。