CN101529849A - 无线电到sip适配器中的声音调制识别 - Google Patents

无线电到sip适配器中的声音调制识别 Download PDF

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CN101529849A
CN101529849A CN200780032758.1A CN200780032758A CN101529849A CN 101529849 A CN101529849 A CN 101529849A CN 200780032758 A CN200780032758 A CN 200780032758A CN 101529849 A CN101529849 A CN 101529849A
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D·哈尔
D·弗洛耶得
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JPS Communications Inc
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/1066—Session management
    • H04L65/1101—Session protocols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/10—Architectures or entities
    • H04L65/102—Gateways
    • H04L65/1023—Media gateways
    • H04L65/1026—Media gateways at the edge
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/10—Architectures or entities
    • H04L65/102—Gateways
    • H04L65/1033—Signalling gateways
    • H04L65/1036—Signalling gateways at the edge
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/1066—Session management
    • H04L65/1101—Session protocols
    • H04L65/1104—Session initiation protocol [SIP]
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
    • G10L25/00—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00
    • G10L25/78—Detection of presence or absence of voice signals
    • G10L2025/783—Detection of presence or absence of voice signals based on threshold decision

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Abstract

本发明公开一种无线电到SIP适配器，包括声音检测算法处理器以及其它电路以提供无线电和SIP适配器之间的接口来适应从半双工到全双工的切换，并且当人的语音存在于来自电话网络的音频信号中时使无线电进行传送。

Description

无线电到SIP适配器中的声音调制识别
技术领域
本发明通常涉及手持无线电设备，并且尤其涉及将这样的手持无线电设备接入到电话网络的系统和技术。
背景技术
手持无线电设备经常用于公共安全方面，并且在遇到紧急情况时经常期望将手持无线电连接到电话网络。最近，电话网络正在实施一项通常被称为基于IP的语音的新的通信技术，其中使用互联网协议(IP)网络进行语音通信。基于IP的语音通信采用会话初始化协议(SIP)作为信令选择的协议。SIP是用于在IP网络中建立会话的信令协议，并且是本领域技术人员所熟知的RFC标准(RFC 3261)。通过使用SIP，电话成为另一个网络应用并且与其它互联网服务集成在一起。
在公共安全应用中，经常期望通过所谓的无线电到SIP适配器而将手持无线电设备接入到电话网络。通常操作于半双工模式的这样一种手持无线电设备缺乏一种在不需要某种类型的操作者干预的情况下由通过SIP网络的通话进行控制的方式。
需要提供这样一种技术，其中来自使用SIP的网络的无线电通话能够控制无线电收发机的激活，当电话网络上的参与方希望讲话时，使无线电收发机进行从接收到发送再回到接收的切换。
发明内容
按照本发明，无线电到SIP适配器包括声音检测算法处理器，用于检测音频信号中人的语音的存在；音频输入，用于接收音频信号；以及无线电发送指示器信号输出，用于提供表示人的语音存在于音频信号中的信号。利用这种配置，可以通过使用SIP的电话网络来初始化无线电通话，而无需操作者干预。
附图说明
通过参照附图将更加充分地理解本发明的前述特征以及本发明本身，在附图中：
图1是根据本发明的无线电到SIP适配器的声音调制识别的方框图；
图2示出了根据本发明的无线电到SIP的操作流程图；并且
图3是根据本发明的以软件实现的声音检测算法的方框图。
具体实施方式
熟知手持无线电的技术人员将会意识到，在正常操作中，该无线电以公知的半双工模式操作，在该半双工模式下，通过接收机来接收接收信号并且通过扬声器向用户提供音频输出。当用户希望讲话时，按压按下通话按钮来激活发射机并且用户对着麦克风讲话以进行传输。为了简化操作，大多数手持无线电提供外部麦克风和扬声器接口以使得可以使用外部麦克风和扬声器耳机。基站与手持无线电类似，除了基站被配置为用于更持久的位置之外。在典型操作中，多个手持无线电将在彼此之间并且与基站进行通信。
当实际上是半双工的无线电收发机被接入到实际上是全双工的SIP(会话初始化协议)电话网络时，存在控制发射机的激活的需要，当电话网络上的参与方希望讲话时，使发射机从接收切换到发送并且再返回。通过分析来自电话网络的音频并且使用合适的信号处理算法，可以确定人的语音能量的存在并且可以有效地控制发射机。现有的系统使用被称为VOX(声控制切换)的完全等级感测系统，该系统并不检查音频的内容。背景噪音和非语音信号会“欺骗”该发射机的激活。其它方法涉及在电话键区上指定按键作为“按下通话”(PTT)按钮，但是这需要用户培训并且易于发生错误。
在本发明中，当SIP电话设备的用户讲话时无线电被激活，但是该无线电不会被背景噪音或其它非语音信号激活。这提供了一种可靠而透明的从半双工无线电系统到全双工SIP电话网络的会话。本发明允许无线电收发机经由SIP(会话初始化协议)连接到电话网络。这样接口的一个问题是在无线电的半双工本质(可以发送或接收，但是不能同时进行发送和接收)与电话环境的全双工本质之间的不一致。本发明使用被称为声音调制识别或声音检测的信号处理算法来激活发射机以确保只有在电话网络的参与方讲话时该发射机才进行发送，并且不会由于背景噪音或其它非语音信号而进行发送。在无线电到SIP接口中，这样的算法是唯一的并且提供了一种将半双工通信设备连接到SIP电话网络的高效方法。该无线电表现为任何其它SIP端点，并且用户无需培训而且也不需要像其它系统所要求的那样按压电话键区上的指定键来激活该发射机。
现在参照图1，无线电到SIP适配器10包括声音检测算法处理器12以及其它电路(未示出)以提供无线电和SIP适配器之间的接口。应该意识到，该无线电到SIP适配器10可以是单机单元或者在SIP适配器的制造期间被包括作为该SIP适配器的一部分。无线电到SIP适配器10包括音频信号输入14，该音频信号输入14也被提供作为输出16。音频输入信号包括被测试用于人的语音的存在的音频。该无线电到SIP适配器10还包括无线电发送信号输出18。该无线电发送信号向无线电提供指示，表明该无线电能够使能其发射机并且发送音频。
该无线电到SIP适配器10设置在本地无线电和SIP适配器之间，该SIP适配器提供到IP网络的接口，基于IP的语音通信应用在该IP网络上操作。
现在参照图2，示出了描述该无线电到SIP适配器10的操作流程图100，该流程图从步骤22开始。如步骤24所示，该无线电到SIP适配器监测用于音频的音频信号输入14并且通过声音检测算法处理器12处理该音频以检测在该音频信号中人的语音的存在。如步骤26所示，如果检测到人的语音，则该无线电到SIP适配器10将该无线电传送信号设置为有效，以使得该无线电将开启其发射机并且发送音频，否则该无线电到SIP适配器10将无线电发送设置为无效。如步骤28所示，实时地重复步骤24和26，以使得该无线电发送信号保持与该音频信号同步。
应该意识到，流程图表示计算机软件指令或指令组。可选择地，该处理和判断模块代表由功能等效的电路执行的步骤，该电路例如是数字信号处理器电路或专用集成电路(ASIC)。该流程图并没有描述任何特定编程语言的语法。但是，该流程图示出了本领域普通技术人员在制造电路或生成计算机软件以执行特定设备需要的处理所需的功能性信息。应该注意到，许多例程程序元素，例如循环和变量的初始化以及临时变量的使用并未示出。本领域的普通技术人员应该意识到，除非这里以其它方式指明，所述步骤的特定顺序仅仅是示意性的并且能够在不偏离本发明精神的情况下进行变动。这样，除非以其它方式说明，下述步骤是无序的，这意味着在尽可能的时候，可以按照任何方便或期望的顺序来执行这些步骤。
由该处理器12执行的声音检测算法可以是能够检测人的语音的任意声音检测算法。例如，能够检测人的语音的声音检测算法中的一个例子已经使用德州仪器的TMS320VC5409数字信号处理器实现。应该注意到，与对语音进行分析以将语音转换为文本的语音辨识设备不同，在本发明的设备中，分析该音频以检测人的语音的存在。
现在参照图3，示出了由处理器12中的软件实现的声音检测算法40的方框图，包括音频输入42。该音频由多个带通滤波器44分离成多个信号45a，45b，45c，45d，该多个信号45a，45b，45c，45d在各自的带宽内具有不同的频率。将该对个信号45a-45d中的任何一个输入到包络检波器45中的各自一个，在包络检波器45中这些信号被取平均。将输出信号47a，47b，47c，47d中的任何一个输入到多个低通滤波器48中的各自一个。将输出信号49a，49b，49c，49d中的任何一个输入到包络检波器50中的各自一个，在包络检波器50中这些信号被取平均。将输出信号51a，51b，51c，51d中的任何一个输入到音节检测决策逻辑52中，在该音节检测决策逻辑52中使用输入到该音节检测决策逻辑52的信号的各种时间和幅度阈值，按照从以往已知的人的语音所获得的信息来确定人的语音的存在。后者(音节检测决策逻辑52)将在例如无线电静噪和背景噪声的其它声音中识别出语音的存在。当检测到人的语音存在时，提供语音检测信号54以适当地激活无线电。
应该意识到，该无线电到SIP适配器10监控来自电话网络的无线电信号并且当该无线电到SIP适配器10检测到人的语音时激活无线电发射机。
已经描述了本发明的优选实施例，现在对于本领域的普通技术人员来说很明显，可以使用结合其概念的其它实施例。因此能感觉到，这些实施例并不局限于所公开的实施例而是仅由所附权利要求的精神和范围限定。

Claims (6)

1、一种无线电到SIP适配器，包括：
声音检测算法处理器，用于检测音频信号中人的语音的存在；
音频输入，用于接收音频信号；以及
无线电发送指示器信号输出，用于提供表明人的语音存在于所述音频信号中的信号。
2、根据权利要求1所述的无线电到SIP适配器，其中，所述无线电到SIP适配器与SIP适配器集成在一起。
3、根据权利要求1所述的无线电到SIP适配器，其中，所述声音检测算法处理器包括德州仪器的TMS320VC5409数字信号处理器。
4、一种使无线电进行发送的方法，包括：
监控音频信号并且使用声音检测算法来处理所述信号，以检测所述音频信号中人的语音的存在；
如果检测到人的语音，则激活无线电发送信号以使无线电发送音频；以及
如果没有检测到人的语音，则不激活无线电发送信号以使无线电不发送音频。
5、根据权利要求3所述的方法，其中，所述音频信号来自电话网络并且重复所述方法以保持与所述音频信号中的所述人的语音同步。
6、一种无线电到SIP适配器，包括：
声音检测算法处理器，用于检测音频信号中人的语音的存在；
音频输入，用于接收来自电话网络的音频信号；
无线电发送指示器信号输出，用于提供表明人的语音存在于所述音频信号中的信号，并且当人的语音存在于来自所述电话网络的所述音频信号中时，使无线电发送音频。
CN200780032758.1A 2006-08-04 2007-08-03 无线电到sip适配器中的声音调制识别 Pending CN101529849A (zh)

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