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    • 3. 发明授权
    • System for bandwidth extension of narrow-band speech
    • 窄带语音带宽扩展系统
    • US08595001B2
    • 2013-11-26
    • US13290464
    • 2011-11-07
    • David MalahRichard Vandervoort Cox
    • David MalahRichard Vandervoort Cox
    • G10L19/00
    • G10L21/038
    • A method applies a parametric approach to bandwidth extension but does not require training. The method computes narrowband linear predictive coefficients from a received narrowband speech signal, computes narrowband partial correlation coefficients using recursion, computes Mnb area coefficients from the partial correlation coefficient, and extracts Mwb area coefficients using interpolation. Wideband parcors are computed from the Mwb area coefficients and wideband LPCs are computed from the wideband parcors. The method further comprises synthesizing a wideband signal using the wideband LPCs and a wideband excitation signal, highpass filtering the synthesized wideband signal to produce a highband signal, and combining the highband signal with the original narrowband signal to generate a wideband signal.
    • 一种方法将参数化方法应用于带宽扩展,但不需要培训。 该方法从接收的窄带语音信号计算窄带线性预测系数,使用递归计算窄带部分相关系数,从部分相关系数计算Mnb面积系数,并使用插值提取Mwb面积系数。 从Mwb区域系数计算宽带掩码,并从宽带掩码计算宽带LPC。 该方法还包括使用宽带LPC和宽带激励信号合成宽带信号,对合成的宽带信号进行高通滤波以产生高频带信号,以及将高频带信号与原始窄带信号组合以产生宽带信号。
    • 6. 发明申请
    • SYSTEM FOR BANDWIDTH EXTENSION OF NARROW-BAND SPEECH
    • 窄带语音带宽扩展系统
    • US20100042408A1
    • 2010-02-18
    • US12582034
    • 2009-10-20
    • David MalahRichard Vandervoort Cox
    • David MalahRichard Vandervoort Cox
    • G10L21/00
    • G10L21/038
    • A system and method are disclosed for extending the bandwidth of a narrowband signal such as a speech signal. The method applies a parametric approach to bandwidth extension but does not require training. The parametric representation relates to a discrete acoustic tube model (DATM). The method comprises computing narrowband linear predictive coefficients (LPCs) from a received narrowband speech signal, computing narrowband partial correlation coefficients (parcors) using recursion, computing Mnb area coefficients from the partial correlation coefficient, and extracting Mwb area coefficients using interpolation. Wideband parcors are computed from the Mwb area coefficients and wideband LPCs are computed from the wideband parcors. The method further comprises synthesizing a wideband signal using the wideband LPCs and a wideband excitation signal, highpass filtering the synthesized wideband signal to produce a highband signal, and combining the highband signal with the original narrowband signal to generate a wideband signal. In a preferred variation of the invention, the Mnb area coefficients are converted to log-area coefficients for the purpose of extracting, through shifted-interpolation, Mwb log-area coefficients. The Mwb log-area coefficients are then converted to Mwb area coefficients before generating the wideband parcors.
    • 公开了用于扩展诸如语音信号的窄带信号的带宽的系统和方法。 该方法对带宽扩展采用参数化方法,但不需要培训。 参数表示涉及离散声管模型(DATM)。 该方法包括从接收的窄带语音信号中计算窄带线性预测系数(LPC),使用递归计算窄带部分相关系数(parcors),从部分相关系数计算Mnb面积系数,以及使用插值提取Mwb面积系数。 从Mwb区域系数计算宽带掩码,并从宽带掩码计算宽带LPC。 该方法还包括使用宽带LPC和宽带激励信号合成宽带信号,对合成的宽带信号进行高通滤波以产生高频带信号,以及将高频带信号与原始窄带信号组合以产生宽带信号。 在本发明的优选变型中,Mnb面积系数被转换为对数面积系数,以便通过移位插值提取Mwb对数面积系数。 然后在生成宽带掩码之前,将Mwb对数区域系数转换为Mwb区域系数。
    • 10. 发明授权
    • System and method of ubiquitous language translation for wireless devices
    • 无线设备无处不在的语言翻译系统和方法
    • US07272377B2
    • 2007-09-18
    • US10067851
    • 2002-02-07
    • Richard Vandervoort CoxThomas M. Isaacson
    • Richard Vandervoort CoxThomas M. Isaacson
    • H04Q7/20G06F17/28
    • H04W4/02H04M3/42229H04M2203/2061H04M2207/18H04M2242/30
    • A system and method of providing a location-based translation service is disclosed. A wireless device receives from a wireless network an updated priority target language list according to the location of the wireless device. The wireless device and/or wireless network are capable of automatic speech recognition (ASR), text-to-speech (TTS) services and language translation services. A language and location database module associates probable target languages in a given area. The wireless network node receives the location of the wireless device through a network-based location means or through a GPS system and compares the location of the wireless device to the language and location database. The wireless network transmits to the wireless device an updated priority language list based on the data in the language and location database such that the wireless device pre-selects the most likely target language if the user launches the language translation application. When the user launches the language translation application, the selection of the target language is simplified since the most likely target language is pre-selected.
    • 公开了一种提供基于位置的翻译服务的系统和方法。 无线设备根据无线设备的位置从无线网络接收更新的优先目标语言列表。 无线设备和/或无线网络能够进行自动语音识别(ASR),文本到语音(TTS)服务和语言翻译服务。 语言和位置数据库模块将给定区域中的可能的目标语言相关联。 无线网络节点通过基于网络的位置装置或通过GPS系统接收无线设备的位置,并将无线设备的位置与语言和位置数据库进行比较。 无线网络基于语言和位置数据库中的数据向无线设备发送更新的优先级语言列表,使得如果用户启动语言翻译应用,则无线设备预先选择最可能的目标语言。 当用户启动语言翻译应用程序时,简化了目标语言的选择,因为预先选择了最可能的目标语言。