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1.发明授权
公开(公告)号：US5995923A
公开(公告)日：1999-11-30
申请号：US883353
申请日：1997-06-26
CPC分类号： G10L19/16 , H04W88/181
摘要： In recent years, the telecommunications industry has witnessed the proliferation of a variety of digital vocoders in order to meet bandwidth demands of different wireline and wireless communication systems. The rapid growth in the diversity of networks and the number of users of such networks is increasing the number of instances where two vocoders are placed in tandem to serve a single connection. Such arrangements of low bit-rate codecs can degrade the quality of the transmitted speech. To overcome this problem the invention provides a novel method and an apparatus for transmitting digitized voice signals in the wireless communications environment. The apparatus is capable of converting a compressed speech signal from one format to another format via an intermediate common format, thus avoiding the necessity to successively de-compress voice data to a PCM type digitization and then recompress the voice data.
摘要翻译： 近年来，电讯业目睹了各种数字声码器的扩散，以满足不同有线和无线通讯系统的带宽需求。 网络的多样性的快速增长和这种网络的用户数量正在增加两个声码器串联放置以服务于单个连接的情况的数量。 低比特率编解码器的这种布置可能会降低发送语音的质量。 为了克服这个问题，本发明提供了一种用于在无线通信环境中发送数字化语音信号的新颖方法和装置。 该装置能够通过中间公共格式将压缩的语音信号从一种格式转换成另一格式，从而避免必须将语音数据连续解压缩到PCM型数字化，然后再重新压缩语音数据。
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公开(公告)号：US06324515B1
公开(公告)日：2001-11-27
申请号：US09088895
申请日：1998-06-02
申请人： Rafi Rabipour , Paul Coverdale , William Navarro
发明人： Rafi Rabipour , Paul Coverdale , William Navarro
IPC分类号： G10L2104
CPC分类号： G10L19/00
摘要： This invention relates to a method and an apparatus for processing digital audio signals that may reduce the signal degradation occurring when the signal is exchanged between two communication terminals equipped with vocoders in a communication network. The solution proposed by this invention is to provide a communication terminal with a vocoder including a decoder section provided with a plurality of decoding units. A switch activates a selected one of the decoding units in dependence of the format of the compressed audio signal data frames received from a remote communication terminal. This system allows the communication terminal to support a number of different speech compression formals. In order to achieve simplicity and low cost, the communication terminal is provided with a single encoding unit. This results in an asymmetric arrangement where the communication terminal has a large number of decoding units than encoding units. The great majority of the speech compression algorithms deployed in wireless and Internet telephony standards have the property that their speech decoders are of far less computational complexity than their respective speech encoder. Therefore, a low-cost terminal can be produced which supports a low complexity speech encoder unit and a variety of speech decoder units.
摘要翻译： 本发明涉及一种用于处理数字音频信号的方法和装置，其可以减少在通信网络中配备声码器的两个通信终端之间交换信号时发生的信号劣化。 本发明提出的解决方案是提供一种具有声码器的通信终端，该声码器包括设置有多个解码单元的解码器部分。 开关根据从远程通信终端接收的压缩音频信号数据帧的格式来激活所选择的解码单元。 该系统允许通信终端支持多种不同的语音压缩形式。 为了实现简单性和低成本，通信终端设置有单个编码单元。 这导致非对称布置，其中通信终端具有比编码单元大的解码单元数量。 部署在无线和因特网电话标准中的绝大多数语音压缩算法具有这样的性质：它们的语音解码器的计算复杂度远远低于它们各自的语音编码器。 因此，可以制造支持低复杂性语音编码器单元和各种语音解码器单元的低成本终端。
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公开(公告)号：US20050114433A1
公开(公告)日：2005-05-26
申请号：US10721909
申请日：2003-11-26
申请人： Rafi Rabipour , Paul Coverdale
发明人： Rafi Rabipour , Paul Coverdale
CPC分类号： H04L65/4038 , H04L29/06027
摘要： A conference bridge adapter for processing data carried on a media path between, on the one hand, a conference bridge operative to communicate composite packets carrying media information and auxiliary information pertaining to the media information and, on the other hand, an endpoint characterized by an inability to exchange composite packets with the conference bridge. In one direction, a stream of composite packets is received from the bridge. An output media stream without auxiliary information is generated from the media information in each received composite packet. In the opposite direction, a stream of packets carrying only media information is received from the endpoint. Auxiliary information is derived from the media information and a stream of composite packets is generated by combining the media information and the auxiliary information. Thus, a media conference can be established between seemingly incompatible network elements.
摘要翻译： 一种用于处理媒体路径上承载的数据的会议桥适配器，一方面是可操作以传送携带媒体信息的复合分组的会议桥和与媒体信息有关的辅助信息，另一方面， 无法与会议桥交换复合数据包。 在一个方向上，从桥接收到复合数据包流。 从每个接收到的复合分组中的媒体信息生成没有辅助信息的输出媒体流。 在相反的方向，从端点接收到仅携带媒体信息的分组流。 从媒体信息导出辅助信息，并通过组合媒体信息和辅助信息来生成复合数据包流。 因此，可以在看似不兼容的网络元素之间建立媒体会议。
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公开(公告)号：US07076316B2
公开(公告)日：2006-07-11
申请号：US09859640
申请日：2001-05-18
申请人： Rafi Rabipour , Chung Cheung Chu , Paul Coverdale
发明人： Rafi Rabipour , Chung Cheung Chu , Paul Coverdale
CPC分类号： H04W88/181 , H04L29/06 , H04L29/06027 , H04L65/80
摘要： A method and apparatus for controlling an operative setting of a communications link is provided. The communications link is capable of acquiring a plurality of operative settings. Audio quality in the communications link under different operative settings is compared and an operative setting is selected at least in part on the basis of this comparison. A control signal is sent to at least one component in the communications link to cause the communications link to attempt to acquire the selected setting.
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公开(公告)号：US07006456B2
公开(公告)日：2006-02-28
申请号：US09986498
申请日：2001-11-09
申请人： Rafi Rabipour , Paul Coverdale , Paxton Smith
发明人： Rafi Rabipour , Paul Coverdale , Paxton Smith
CPC分类号： H04L65/605 , H04L29/06 , H04L29/06027 , H04L65/103 , H04L65/104 , H04L65/4038 , H04L65/607 , H04W88/181
摘要： A conference bridge is provided for managing a conference between media signal sources generating media data packets conveying encoded media information and encoding type information. The media signal sources, in order to enter a conference, generate link messages including respective supported encoding types and transmit the link messages to the conference bridge. The conference bridge receives the link messages and processes them to derive a first common encoding type supported all media signal sources in the conference and a second encoding type supported a subset of media signal sources in the conference. The conference bridge generates link message reply signals conveying the first encoding type and the second encoding type the subset of media signal sources and conveying at least the first encoding type to the media signal sources other than the subset of all media signal sources. Each media signal source is responsive to the link message reply signal to render active at least the first encoding type and selectively render active the second encoding type.
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公开(公告)号：US5455888A
公开(公告)日：1995-10-03
申请号：US985418
申请日：1992-12-04
CPC分类号： G10L21/038 , G10L19/0204 , G10L21/0232
摘要： A speech bandwidth extension method and apparatus analyzes narrowband speech sampled at 8 kHz using LPC analysis to determine its spectral shape and inverse filtering to extract its excitation signal. The excitation signal is interpolated to a sampling rate of 16 kHz and analyzed for pitch control and power level. A white noise generated wideband signal is then filtered to provide a synthesized wideband excitation signal. The narrowband shape is determined and compared to templates in respective vector quantizer codebooks, to select respective highband shape and gain. The synthesized wideband excitation signal is then filtered to provide a highband signal which is, in turn, added to the narrowband signal, interpolated to the 16 kHz sample rate, to produce an artificial wideband signal. The apparatus may be implemented on a digital signal processor chip.
摘要翻译： 语音带宽扩展方法和装置分析使用LPC分析以8kHz采样的窄带语音，以确定其频谱形状和反向滤波以提取其激励信号。 激励信号内插到16 kHz的采样率，并分析了音调控制和功率电平。 然后对产生白噪声的宽带信号进行滤波以提供合成的宽带激励信号。 确定窄带形状并将其与各矢量量化器码本中的模板进行比较，以选择各自的高频带形状和增益。 然后对合成的宽带激励信号进行滤波以提供高频带信号，该高频带信号又被加到窄带信号中，以16kHz采样率内插，以产生人造宽带信号。 该装置可以在数字信号处理器芯片上实现。
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公开(公告)号：US4853958A
公开(公告)日：1989-08-01
申请号：US201154
申请日：1988-06-02
IPC分类号： H04Q1/457
CPC分类号： H04Q1/4575
摘要： A dual tone multi-frequency (DTMF) receiver for use in detecting digitally transmitted signals in the telephone industry. The receiver derives linear predictive coefficients for the digital signals in the data frame. This information is used to compute frequency response magnitudes at the DTMF frequencies. A plurality of magnitude comparisons are then performed to verify the presence of true DTMF signals and concurrently the frequency of these signals is obtained.
摘要翻译： 一种双音多频（DTMF）接收机，用于检测电话行业中的数字传输信号。 接收器为数据帧中的数字信号导出线性预测系数。 该信息用于计算DTMF频率的频率响应幅度。 然后执行多个幅度比较以验证真实DTMF信号的存在，同时获得这些信号的频率。
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公开(公告)号：US08194649B2
公开(公告)日：2012-06-05
申请号：US12458883
申请日：2009-07-27
IPC分类号： H04L12/66
CPC分类号： H04M7/0027 , H04L12/6418 , H04L69/08 , H04L69/24 , H04L2012/6486 , H04M3/08
摘要： Data communication apparatus including a port and a control entity. The control entity is operative to establish a connection with a remote entity over a first path and negotiate with the remote entity using in-band signaling over the first path establishment of a second path allowing the exchange of data between the data communication apparatus and the remote entity. The invention presents advantages from the standpoint of ease of implementation and bandwidth and resource savings. The use of an in-band messaging protocol to negotiate a establishment of the second path can be implemented generally in a straight forward manner. At the same time, the ability to transfer at least part of the connection to the second path avoids the drawbacks that would arise if that part of the connection were constrained to the first path. This feature allows the operator to take advantage of benefits provided by the second path but not available to the first path.
摘要翻译： 包括端口和控制实体的数据通信装置。 控制实体可操作以通过第一路径与远程实体建立连接，并使用允许在数据通信设备和远端之间的数据交换的第二路径的第一路径建立的带内信令与远程实体进行协商 实体。 从实现的方便性和带宽和资源节省的观点出发，本发明具有优点。 通常使用带内消息协议来协商第二路径的建立通常以直接方式实现。 同时，将连接的至少一部分传送到第二路径的能力避免了如果连接的那部分被限制到第一路径时会出现的缺点。 该特征允许操作者利用由第二路径提供的优点，但不能用于第一路径。
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公开(公告)号：US08116335B2
公开(公告)日：2012-02-14
申请号：US11984490
申请日：2007-11-19
CPC分类号： H04L12/66 , H04L12/6418 , H04L69/08 , H04L69/24 , H04L2012/6486 , H04M3/08 , H04M7/0027 , H04W76/12
摘要： A data communication apparatus, comprising an interface for enabling communication with a remote entity via a network and a control entity in communication with said interface. The control entity is operative to establish a packet-switched connection with the remote entity through the network and to negotiate with the remote entity using in-band signaling entry into a codec-bypass mode of operation. In this way, a codec-bypass connection, which enhances speech quality, can be established over a packet network, which reduces bandwidth.
摘要翻译： 一种数据通信装置，包括用于经由网络和与所述接口通信的控制实体与远程实体进行通信的接口。 控制实体可操作以通过网络与远程实体建立分组交换连接，并使用带内信令进入编解码器旁路操作模式与远程实体进行协商。 以这种方式，可以通过分组网络建立增强语音质量的编解码器旁路连接，从而降低带宽。
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公开(公告)号：US20100039949A1
公开(公告)日：2010-02-18
申请号：US12458883
申请日：2009-07-27
IPC分类号： H04L12/26
CPC分类号： H04M7/0027 , H04L12/6418 , H04L69/08 , H04L69/24 , H04L2012/6486 , H04M3/08
摘要： Data communication apparatus including a port and a control entity. The control entity is operative to establish a connection with a remote entity over a first path and negotiate with the remote entity using in-band signaling over the first path establishment of a second path allowing the exchange of data between the data communication apparatus and the remote entity. The invention presents advantages from the standpoint of ease of implementation and bandwidth and resource savings. The use of an in-band messaging protocol to negotiate a establishment of the second path can be implemented generally in a straight forward manner. At the same time, the ability to transfer at least part of the connection to the second path avoids the drawbacks that would arise if that part of the connection were constrained to the first path. This feature allows the operator to take advantage of benefits provided by the second path but not available to the first path.
摘要翻译： 包括端口和控制实体的数据通信装置。 控制实体可操作以通过第一路径建立与远程实体的连接，并使用通过允许在数据通信设备和远端之间的数据交换的第二路径的第一路径建立的带内信令来与远程实体进行协商 实体。 从实现的方便性和带宽和资源节省的观点出发，本发明具有优点。 通常使用带内消息协议来协商第二路径的建立通常以直接方式实现。 同时，将连接的至少一部分传送到第二路径的能力避免了如果连接的那部分被限制到第一路径时会出现的缺点。 该特征允许操作者利用由第二路径提供的优点，但不能用于第一路径。
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