公开(公告)号：US06717991B1

公开(公告)日：2004-04-06

申请号：US09493265

申请日：2000-01-28

申请人： Harald Gustafsson ,  Ulf Lindgren ,  Ingvar Claesson ,  Sven Nordholm

发明人： Harald Gustafsson ,  Ulf Lindgren ,  Ingvar Claesson ,  Sven Nordholm

IPC分类号： H04B1500

CPC分类号： H04R3/005

摘要： Speech enhancement is provided in dual microphone noise reduction systems by including spectral subtraction algorithms using linear convolution, causal filtering and/or spectrum dependent exponential averaging of the spectral subtraction gain function. According to exemplary embodiments, when a far-mouth microphone is used in conjunction with a near-mouth microphone, it is possible to handle non-stationary background noise as long as the noise spectrum can continuously be estimated from a single block of input samples. The far-mouth microphone, in addition to picking up the background noise, also picks up the speaker's voice, albeit at a lower level than the near-mouth microphone. To enhance the noise estimate, a spectral subtraction stage is used to suppress the speech in the far-mouth microphone signal. To be able to enhance the noise estimate, a rough speech estimate is formed with another spectral subtraction stage from the near-mouth signal. Finally, a third spectral subtraction function is used to enhance the near-mouth signal by suppressing the background noise using the enhanced background noise estimate. A controller dynamically determines any or all of a first, second, and third subtraction factor for each of the first, second, and third spectral subtraction stages, respectively.

摘要翻译： 通过使用线性卷积，频谱减法增益函数的因果滤波和/或频谱依赖指数平均的频谱减法算法，在双麦克风降噪系统中提供语音增强。 根据示例性实施例，当远端麦克风与近嘴麦克风结合使用时，只要可以从单个输入样本块连续地估计噪声谱，就可以处理非平稳背景噪声。 远端麦克风除了吸收背景噪音外，还会吸收扬声器的声音，尽管距离近嘴麦克风较低。 为了增强噪声估计，使用频谱减法级来抑制远口麦克风信号中的语音。 为了能够增强噪声估计，粗略的语音估计是由近端信号的另一个谱减法阶段形成的。 最后，使用第三频谱减法函数，通过使用增强的背景噪声估计来抑制背景噪声来增强近嘴信号。 控制器分别动态地确定第一，第二和第三频谱减法级中的每一个的第一，第二和第三减法因子中的任何一个或全部。

公开(公告)号：US20070209498A1

公开(公告)日：2007-09-13

申请号：US10596572

申请日：2004-12-17

申请人： Ulf Lindgren ,  Harald Gustafsson

发明人： Ulf Lindgren ,  Harald Gustafsson

IPC分类号： G10H7/00

CPC分类号： G10H1/361 ,  G10H1/0066 ,  G10H2230/021 ,  G10H2240/031 ,  G10H2240/061 ,  G10H2240/071 ,  G10H2240/145 ,  G10H2240/251

摘要： A method and unit for composing or decomposing a multimedia signal according to the Musical Instrument Digital Interface (MIDI) protocol. The signal carries events of a first type, which are arranged to carry instructions regarding which predefined patches to use for playback and which predefined notes to play, and events of a second type which carry additional content. The signal is parsed to identify events of the second type and to read the additional content. Coded samples of multimedia content are loaded at an address specified in the additional content. The coded samples are then decoded to provide the samples for playback of the multimedia content. In this manner, vocal song or vocals and other audio type signals are efficiently conveyed utilizing the widely used MIDI protocol.

摘要翻译： 根据乐器数字接口（MIDI）协议来组合或分解多媒体信号的方法和单元。 信号携带第一类型的事件，其被布置为携带关于用于播放的哪些预定义补丁以及要播放的预定义笔记以及携带附加内容的第二类型的事件的指令。 该信号被解析为识别第二类型的事件并读取附加内容。 多媒体内容的编码样本以附加内容中指定的地址加载。 然后将编码的样本解码以提供用于多媒体内容的回放的样本。 以这种方式，使用广泛使用的MIDI协议有效地传达声乐歌曲或声乐和其他音频类型的信号。

公开(公告)号：US06704711B2

公开(公告)日：2004-03-09

申请号：US09754993

申请日：2001-01-05

申请人： Harald Gustafsson ,  Ulf Lindgren ,  Clas Thurban ,  Petra Deutgen

发明人： Harald Gustafsson ,  Ulf Lindgren ,  Clas Thurban ,  Petra Deutgen

IPC分类号： G10L1300

CPC分类号： G10L21/038

摘要： A system and method for speech signal enhancement upsamples a narrowband speech signal at a receiver to generate a wideband speech signal. The lower frequency range of the wideband speech signal is reproduced using the received narrowband speech signal. The received narrowband speech signal is analyzed to determine its formants and pitch information. The upper frequency range of the wideband speech signal is synthesized using information derived from the received narrowband speech signal.

摘要翻译： 用于语音信号增强的系统和方法在接收机处对窄带语音信号进行采样以产生宽带语音信号。 使用接收到的窄带语音信号来再现宽带语音信号的较低频率范围。 分析所接收的窄带语音信号以确定其共振峰和音调信息。 使用从接收的窄带语音信号导出的信息来合成宽带语音信号的上限频率范围。

公开(公告)号：US20110274191A1

公开(公告)日：2011-11-10

申请号：US13123673

申请日：2008-10-09

申请人： Ulf Lindgren ,  Bo Hagerman

发明人： Ulf Lindgren ,  Bo Hagerman

IPC分类号： H04L27/28

CPC分类号： H04B7/0691 ,  H04B7/0417 ,  H04B7/0602 ,  H04B7/0639

摘要： The present invention relates to a multi-stream communication system comprising a transmitting node provided with a polyphase antenna and a receiving node provided with an antenna arrangement configured to receive multiple data streams. The polyphase antenna has at least one group of multiple antenna elements, each group having N antenna elements. The transmitting node is also provided with at least one radio chain and a switch for each radio chain arranged to cyclically connect each radio chain to the antenna elements in one of the groups. The switch is configured to operate with a switching frequency fsw. The transmitting node is further configured to transmit M weighted symbols of an uncorrelated signal from each antenna element in each group, the M weighted symbols being less than or equal to N, and the receiving node is further configured to convert the received N data streams into each respective uncorrelated signal.

摘要翻译： 多流通信系统技术领域本发明涉及一种多流通信系统，包括：具有多相天线的发送节点和配置有接收多个数据流的天线配置的接收节点。 多相天线具有至少一组多个天线元件，每组具有N个天线元件。 发射节点还设置有至少一个无线电链和用于每个无线电链的交换机，其被布置为将每个无线电链周期性地连接到组中的一个中的天线元件。 开关配置为以开关频率fsw运行。 发送节点还被配置为从每个组中的每个天线元件发送不相关信号的M个加权符号，M个加权符号小于或等于N，并且接收节点还被配置为将接收到的N个数据流转换成 各自不相关的信号。

公开(公告)号：US20100215113A1

公开(公告)日：2010-08-26

申请号：US12682706

申请日：2007-10-15

申请人： Ulf Lindgren ,  Leonid Krasny ,  Henrik Sahlin

发明人： Ulf Lindgren ,  Leonid Krasny ,  Henrik Sahlin

IPC分类号： H04B7/02 ,  H04L27/00

CPC分类号： H04L25/03343 ,  H04B7/0617 ,  H04B7/0626 ,  H04L2025/03426 ,  H04L2025/03802

摘要： A method for processing signals to be transmitted in a MIMO system from a transmitter having at least two transmitting antennas to a receiver having at least two receiving antennas on a frequency selective communication channel. The method comprises estimating elements of a channel matrix H(q−1) based on time delays and complex valued coefficients associated with the communication channel to provide an estimated frequency variation function of each element of the channel matrix, and pre-coding the signals to be transmitted based on the estimated frequency variation function for each element. The invention also relates to a MIMO system; and a transmitter and a receiver for use in a MIMO system.

摘要翻译： 一种用于处理在MIMO系统中从具有至少两个发射天线的发射机发射到在频率选择性通信信道上具有至少两个接收天线的接收机的信号的方法。 该方法包括基于与通信信道相关联的时间延迟和复值系数来估计信道矩阵H（q-1）的元素，以提供信道矩阵的每个元素的估计频率变化函数，并将该信号预编码为 基于每个元素的估计频率变化函数来发送。 本发明还涉及MIMO系统; 以及用于MIMO系统的发射机和接收机。

公开(公告)号：US08483310B2

公开(公告)日：2013-07-09

申请号：US12919301

申请日：2008-02-25

申请人： Mikael Coldrey ,  Fredrik Athley ,  Ulf Lindgren ,  Sven Oscar Petersson

发明人： Mikael Coldrey ,  Fredrik Athley ,  Ulf Lindgren ,  Sven Oscar Petersson

IPC分类号： H04K1/02

CPC分类号： H04B7/0426 ,  H04B7/0617

摘要： A method of and a precoding device and a communication device for precoding transmit data signals in a wireless Multiple-Input Multiple-Output, MIMO, channel transmission scheme for maximizing channel capacity of the MIMO system given available amounts of transmit power. The precoding is expressed in a complex precoding matrix (W), which is calculated involving individual transmit power constraints of the multiple outputs (71, . . . , 7t) of the MIMO channel. The individual transmit power constraints are comprised of predetermined individual output transmit power amplifier (PA1, . . . , PAt) limitations.

摘要翻译： 一种预编码装置和通信装置的方法，用于在无线多输入多输出MIMO信道传输方案中预编码发射数据信号，用于在给定可用的发射功率量下最大化MIMO系统的信道容量。 预编码在复数预编码矩阵（W）中表示，其被计算涉及MIMO信道的多个输出（71，...，7t）的各个发射功率约束。 单个发射功率约束由预定的单独输出发射功率放大器（PA1，...，PAt）限制组成。

公开(公告)号：US20120219098A1

公开(公告)日：2012-08-30

申请号：US13502432

申请日：2009-10-20

申请人： Ulf Lindgren ,  Henrik Sahlin

发明人： Ulf Lindgren ,  Henrik Sahlin

IPC分类号： H04B1/10 ,  H04L27/06

CPC分类号： H04L25/03114 ,  H04L25/0242 ,  H04L25/03993

摘要： The present invention relates to a node (1) in a wireless communication network, where the node (1) is arranged to receive at least two signals (y1(n), y2(n)) which correspond to at least two transmitted uncorrelated signal streams (x1(n), X2(n)) which have been transmitted to the node via a channel. The channel (2) is signals represented by means of a channel matrix (H(q−1)). The node (1) comprises a controllable filter structure (3) that is arranged to diagonalize the channel matrix (H(q−1)) such that a channel matrix estimation (Ĥ(q−1)) may be obtained. The present invention also relates to a corresponding method.

摘要翻译： 本发明涉及无线通信网络中的节点（1），其中节点（1）被布置为接收与至少两个发送的不相关信号对应的至少两个信号（y1（n），y2（n））） 已经通过信道被发送到节点的流（x1（n），X2（n））。 信道（2）是通过信道矩阵（H（q-1））表示的信号。 节点（1）包括可控滤波器结构（3），其被布置为使信道矩阵（H（q-1））对角化，使得可以获得信道矩阵估计（Ĥ（q-1））。 本发明还涉及相应的方法。

公开(公告)号：US08219074B2

公开(公告)日：2012-07-10

申请号：US12996659

申请日：2008-06-12

申请人： Ulf Lindgren ,  Bo Hagerman

发明人： Ulf Lindgren ,  Bo Hagerman

IPC分类号： H04Q7/20

CPC分类号： H04B7/0689 ,  H04B7/0617 ,  H04B7/0697 ,  H04B17/336 ,  H04W16/18

摘要： The present invention relates to a solution for determining wireless communication cell characteristics related to wireless MIMO transmission mode and dynamically selecting suitable communication transmission mode for certain parts of the wireless communication cell. The solution uses a flatness spectrum analysis of received impulse response from a plurality of measurement points in the cell using a plurality of antennas in a wireless network access gateway, e.g. a base station.

摘要翻译： 本发明涉及一种用于确定与无线MIMO传输模式相关的无线通信小区特性的方案，并且为该无线通信小区的某些部分动态选择合适的通信传输模式。 该解决方案使用无线网络接入网关中的多个天线（例如，无线网络接入网关）对来自小区中的多个测量点的接收脉冲响应的平坦度频谱分析。 一个基站。

公开(公告)号：US20120014467A1

公开(公告)日：2012-01-19

申请号：US13254075

申请日：2009-03-06

申请人： Ulf Lindgren ,  Henrik Sahlin

发明人： Ulf Lindgren ,  Henrik Sahlin

IPC分类号： H04L27/28

CPC分类号： H04L27/266 ,  H04L27/2659

摘要： For compensating carrier frequency generation in communication equipment for radio transmission in an Orthogonal Frequency Division Multiplex, OFDM, based wireless radio communication system, in which reference signals known communication equipment are transmitted in a regular time repetitive manner, carrier frequency generation is compensated (63) by a calculated carrier frequency offset estimate. The carrier frequency offset estimate in the communication equipment is calculated from coarse (61) and fine carrier frequency offset estimates (62). The coarse carrier frequency offset estimate (61) is calculated in the frequency domain from reference symbols of a reference signal received (60) at the communication equipment and the fine carrier frequency offset estimate (62) is calculated in the time domain from reference symbols of reference signals repetitively received (60) at said communication equipment. An algorithm and an estimator module (90) for calculating a coarse carrier frequency offset are provided.

摘要翻译： 为了补偿在正交频分复用的基于OFDM的无线电通信系统中的用于无线电传输的通信设备中的载波频率产生，其中通信设备已知的参考信号以规则的时间重复方式发送，载波频率产生被补偿（ 63）通过计算的载波频率偏移估计。 通信设备中的载波频率偏移估计由粗略（61）和精细载波频率偏移估计（62）计算。 在通信设备处接收到的参考信号（60）的参考符号的频域中计算粗略载波频率偏移估计（61），并且在时域中从参考符号的参考符号计算精细载波频率偏移估计（62） 在所述通信设备处重复地接收（60）的参考信号。 提供了一种用于计算粗载波频率偏移的算法和估计器模块（90）。

公开(公告)号：US09184947B2

公开(公告)日：2015-11-10

申请号：US13502432

申请日：2009-10-20

申请人： Ulf Lindgren ,  Henrik Sahlin

发明人： Ulf Lindgren ,  Henrik Sahlin

IPC分类号： H04L27/06 ,  H04L25/03 ,  H04L25/02

CPC分类号： H04L25/03114 ,  H04L25/0242 ,  H04L25/03993

摘要： The present invention relates to a node (1) in a wireless communication network, where the node (1) is arranged to receive at least two signals (y1(n), y2(n)) which correspond to at least two transmitted uncorrelated signal streams (x1(n), X2(n)) which have been transmitted to the node via a channel. The channel (2) is signals represented by means of a channel matrix (H(q−1)). The node (1) comprises a controllable filter structure (3) that is arranged to diagonalize the channel matrix (H(q−1)) such that a channel matrix estimation (Ĥ(q−1)) may be obtained. The present invention also relates to a corresponding method.

摘要翻译： 本发明涉及无线通信网络中的节点（1），其中节点（1）被布置为接收与至少两个发送的不相关信号对应的至少两个信号（y1（n），y2（n））） 已经通过信道被发送到节点的流（x1（n），X2（n））。 信道（2）是通过信道矩阵（H（q-1））表示的信号。 节点（1）包括可控滤波器结构（3），其被布置为使信道矩阵（H（q-1））对角化，使得可以获得信道矩阵估计（Ĥ（q-1））。 本发明还涉及相应的方法。