ImageVerifierCode 换一换
格式:PDF , 页数:20 ,大小:151.58KB ,
资源ID:800800      下载积分:10000 积分
快捷下载
登录下载
邮箱/手机:
温馨提示:
如需开发票,请勿充值!快捷下载时,用户名和密码都是您填写的邮箱或者手机号,方便查询和重复下载(系统自动生成)。
如填写123,账号就是123,密码也是123。
特别说明:
请自助下载,系统不会自动发送文件的哦; 如果您已付费,想二次下载,请登录后访问:我的下载记录
支付方式: 支付宝扫码支付 微信扫码支付   
注意:如需开发票,请勿充值!
验证码:   换一换

加入VIP,免费下载
 

温馨提示:由于个人手机设置不同,如果发现不能下载,请复制以下地址【http://www.mydoc123.com/d-800800.html】到电脑端继续下载(重复下载不扣费)。

已注册用户请登录:
账号:
密码:
验证码:   换一换
  忘记密码?
三方登录: 微信登录  

下载须知

1: 本站所有资源如无特殊说明,都需要本地电脑安装OFFICE2007和PDF阅读器。
2: 试题试卷类文档,如果标题没有明确说明有答案则都视为没有答案,请知晓。
3: 文件的所有权益归上传用户所有。
4. 未经权益所有人同意不得将文件中的内容挪作商业或盈利用途。
5. 本站仅提供交流平台,并不能对任何下载内容负责。
6. 下载文件中如有侵权或不适当内容,请与我们联系,我们立即纠正。
7. 本站不保证下载资源的准确性、安全性和完整性, 同时也不承担用户因使用这些下载资源对自己和他人造成任何形式的伤害或损失。

版权提示 | 免责声明

本文(ITU-T Q 115 2-2007 Logic for the control of voice enhancement devices and functions (Study Group 16)《语音增强设备和功能的控制逻辑 研究组11》.pdf)为本站会员(medalangle361)主动上传,麦多课文库仅提供信息存储空间,仅对用户上传内容的表现方式做保护处理,对上载内容本身不做任何修改或编辑。 若此文所含内容侵犯了您的版权或隐私,请立即通知麦多课文库(发送邮件至master@mydoc123.com或直接QQ联系客服),我们立即给予删除!

ITU-T Q 115 2-2007 Logic for the control of voice enhancement devices and functions (Study Group 16)《语音增强设备和功能的控制逻辑 研究组11》.pdf

1、 International Telecommunication Union ITU-T Q.115.2TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (01/2007) SERIES Q: SWITCHING AND SIGNALLING Clauses applicable to ITU-T standard systems Logic and protocols for the control of signal processing network elements and functions Logic for the control

2、of voice enhancement devices and functions ITU-T Recommendation Q.115.2 ITU-T Q-SERIES RECOMMENDATIONS SWITCHING AND SIGNALLING SIGNALLING IN THE INTERNATIONAL MANUAL SERVICE Q.1Q.3 INTERNATIONAL AUTOMATIC AND SEMI-AUTOMATIC WORKING Q.4Q.59 FUNCTIONS AND INFORMATION FLOWS FOR SERVICES IN THE ISDN Q.

3、60Q.99 CLAUSES APPLICABLE TO ITU-T STANDARD SYSTEMS Q.100Q.119 General clauses Q.100Q.109 Transmission clauses for signalling Q.110Q.114Logic and protocols for the control of signal processing network elements and functions Q.115 Abnormal conditions Q.116Q.119 SPECIFICATIONS OF SIGNALLING SYSTEMS No

4、. 4, 5, 6, R1 AND R2 Q.120Q.499 DIGITAL EXCHANGES Q.500Q.599 INTERWORKING OF SIGNALLING SYSTEMS Q.600Q.699 SPECIFICATIONS OF SIGNALLING SYSTEM No. 7 Q.700Q.799 Q3 INTERFACE Q.800Q.849 DIGITAL SUBSCRIBER SIGNALLING SYSTEM No. 1 Q.850Q.999 PUBLIC LAND MOBILE NETWORK Q.1000Q.1099 INTERWORKING WITH SATE

5、LLITE MOBILE SYSTEMS Q.1100Q.1199 INTELLIGENT NETWORK Q.1200Q.1699 SIGNALLING REQUIREMENTS AND PROTOCOLS FOR IMT-2000 Q.1700Q.1799 SPECIFICATIONS OF SIGNALLING RELATED TO BEARER INDEPENDENT CALL CONTROL (BICC) Q.1900Q.1999 BROADBAND ISDN Q.2000Q.2999 SIGNALLING REQUIREMENTS AND PROTOCOLS FOR THE NGN

6、 Q.3000Q.3999 For further details, please refer to the list of ITU-T Recommendations. ITU-T Rec. Q.115.2 (01/2007) i ITU-T Recommendation Q.115.2 Logic for the control of voice enhancement devices and functions Summary ITU-T Recommendation Q.115.2 describes the network logic for the control of voice

7、 enhancement devices/functions (VEDs) to be deployed in the network(s). A VED is defined as certain signal processing (acoustic echo control and noise reduction) in the digital transmission path. Mobile networks, where acoustic echo and noise is a common problem, are examples of where VEDs are deplo

8、yed. The signal processing network equipment for VED (SPNE:VED) is the platform that incorporates the VED. The network logic described in ITU-T Recommendation Q.115.2 avoids multiple provisioning of voice enhancement devices/functions in the same digital transmission path of a connection. Source ITU

9、-T Recommendation Q.115.2 was approved on 13 January 2007 by ITU-T Study Group 16 (2005-2008) under the ITU-T Recommendation A.8 procedure. Keywords Acoustic echo control, noise reduction, signal processing network equipment, signalling. ii ITU-T Rec. Q.115.2 (01/2007) FOREWORD The International Tel

10、ecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications. The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of ITU. ITU-T is responsible for studying technical, operating and tariff questions and issuing Recommendations on the

11、m with a view to standardizing telecommunications on a worldwide basis. The World Telecommunication Standardization Assembly (WTSA), which meets every four years, establishes the topics for study by the ITU-T study groups which, in turn, produce Recommendations on these topics. The approval of ITU-T

12、 Recommendations is covered by the procedure laid down in WTSA Resolution 1. In some areas of information technology which fall within ITU-Ts purview, the necessary standards are prepared on a collaborative basis with ISO and IEC. NOTE In this Recommendation, the expression “Administration“ is used

13、for conciseness to indicate both a telecommunication administration and a recognized operating agency. Compliance with this Recommendation is voluntary. However, the Recommendation may contain certain mandatory provisions (to ensure e.g. interoperability or applicability) and compliance with the Rec

14、ommendation is achieved when all of these mandatory provisions are met. The words “shall“ or some other obligatory language such as “must“ and the negative equivalents are used to express requirements. The use of such words does not suggest that compliance with the Recommendation is required of any

15、party. INTELLECTUAL PROPERTY RIGHTS ITU draws attention to the possibility that the practice or implementation of this Recommendation may involve the use of a claimed Intellectual Property Right. ITU takes no position concerning the evidence, validity or applicability of claimed Intellectual Propert

16、y Rights, whether asserted by ITU members or others outside of the Recommendation development process. As of the date of approval of this Recommendation, ITU had not received notice of intellectual property, protected by patents, which may be required to implement this Recommendation. However, imple

17、menters are cautioned that this may not represent the latest information and are therefore strongly urged to consult the TSB patent database at http:/www.itu.int/ITU-T/ipr/. ITU 2007 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior writte

18、n permission of ITU. ITU-T Rec. Q.115.2 (01/2007) iii CONTENTS Page 1 Scope 1 2 References. 1 3 Definitions 1 4 Abbreviations and acronyms 2 5 Conventions 2 6 Voice enhancement control logic . 3 6.1 Abstract model 3 6.2 SPNE:VED. 4 6.3 Voice enhancement control logic . 4 Bibliography. 11 ITU-T Rec.

19、Q.115.2 (01/2007) 1 ITU-T Recommendation Q.115.2 Logic for the control of voice enhancement devices and functions 1 Scope Acoustic echo and noise is a common problem in many networks, e.g., mobile networks. Special signal processing network equipment (SPNE) containing voice enhancement devices/funct

20、ions (VEDs) has been designed to enhance voice quality. This SPNE:VED can be provided as a stand-alone version or integrated into other network equipment. This Recommendation defines a network logic that provides the optimal placement (nearest to the source) of, and avoids multiple provisioning of,

21、VEDs in a connection. This voice enhancement control logic (VECL) is applicable to network entities that control a VED on a per-call basis. As VEDs will normally be deployed in mobile networks, the VECL described in this Recommendation is considered to be applicable in any network that provides VED.

22、 NOTE Multiple VEDs in a connection would waste resources and the interaction between VEDs could impair the voice quality (in the sense of VEDs processing a signal that has already been processed by a VED). 2 References The following ITU-T Recommendations and other references contain provisions whic

23、h, through reference in this text, constitute provisions of this Recommendation. At the time of publication, the editions indicated were valid. All Recommendations and other references are subject to revision; users of this Recommendation are therefore encouraged to investigate the possibility of ap

24、plying the most recent edition of the Recommendations and other references listed below. A list of the currently valid ITU-T Recommendations is regularly published. The reference to a document within this Recommendation does not give it, as a stand-alone document, the status of a Recommendation. ITU

25、-T Q.115.0 ITU-T Recommendation Q.115.0 (2002), Protocols for the control of signal processing network elements and functions. 3 Definitions This Recommendation defines the following terms: 3.1 acoustic echo: The reflected signal resulting from the acoustic path between the earphone/loudspeaker and

26、microphone of a hand-held or hands-free mobile station. 3.2 noise: In the context of voice enhancement, noise is defined as a slowly varying stochastic process appearing additive to the desired speech signal. Specifically, the variation in the characteristics of the noise process is such that it can

27、 be considered approximately stationary over much longer time intervals than a typical speech signal. 3.3 signal processing function (SPF): A software function that performs voice processing such as electric and acoustic echo control, noise reduction or automatic level control. 3.4 signal processing

28、 network equipment (SPNE): Type of network equipment which contains one or more signal processing function(s). In this Recommendation, the focus is on the SPNE:VED (a SPNE that incorporates VED). 3.5 voice enhancement: Combination of acoustic echo cancellation and noise reduction in order to improve

29、 voice quality. 2 ITU-T Rec. Q.115.2 (01/2007) 3.6 voice enhancement device/function (VED): The combination of acoustic echo cancellation and noise reduction in the digital transmission send path provided on a hardware/software basis. NOTE b-ITU-T G.160 defines a VED for mobile networks. 3.7 voice e

30、nhancement control logic (VECL): A network control logic that provides the optimal placement (nearest to the source) of VEDs and avoids multiple provisioning of VEDs in a connection. 4 Abbreviations and acronyms This Recommendation uses the following abbreviations and acronyms: AEC Acoustic Echo Con

31、trol CS MGW Circuit Switched Media Gateway DB Database (data administered by the network operator) EC (network) Echo Canceller GMSC Gateway Mobile Switching Centre IPE Incoming Protocol Entity MSC Mobile Switching Centre NR Noise Reduction OPE Outgoing Protocol Entity SDL Specification and Descripti

32、on Language SPF Signal Processing Function SPNE Signal Processing Network Equipment/Function SPNE:VED SPNE that incorporates VED TFO Tandem Free Operation VE Voice Enhancement VECL Voice Enhancement Control Logic VED Voice Enhancement Device/Function VEDb i. Voice Enhancement Device in backward dire

33、ction included VEDb n.i. Voice Enhancement Device in backward direction not included VEDCF Voice Enhancement Device Control Function VEDCI Voice Enhancement Device Control Info VEDf i. Voice Enhancement Device in forward direction included VEDf n.i. Voice Enhancement Device in forward direction not

34、included VEDIB Voice Enhancement Device Information backward VEDIF Voice Enhancement Device Information forward VEDSF Voice Enhancement Device Switching Function 5 Conventions None. ITU-T Rec. Q.115.2 (01/2007) 3 6 Voice enhancement control logic 6.1 Abstract model Voice enhancement control logic (V

35、ECL) is associated with call/bearer control and has an interface to the incoming and outgoing protocol entities as well as to the voice enhancement device switching function (VEDSF). The VEDSF is either associated with the incoming or outgoing protocol entity. This allows the incoming/outgoing proto

36、col entity to take into consideration the call state when actually controlling the VED (e.g., enabling the VED only after the call has been answered and not during call set-up). In case of a stand-alone SPNE:VED the control protocols used on the interface between VEDSF and the voice enhancement devi

37、ce control function (VEDCF) are those defined in ITU-T Q.115.0, whereas, in case of an integrated SPNE:VED, this interface is an implementation matter. The VECL process can run in addition to other signal processing control logic, e.g., echo control logic (as defined in b-ITU-T Q.115.1), if a node p

38、rovides those signal processing functions in addition to VED. An example of such a node could be a gateway mobile switching centre (GMSC) that provides the VED for its mobile subscribers as well as the echo canceller (EC) for the interconnection to the fixed network. Figure 1 shows the functional en

39、tities and their interrelation. SignallingIncomingprotocolentityOutgoingprotocolentityCall/bearer control Routing etc.VEDIFSignallingVoice enhancementcontrol logic (VECL)VEDIBVEDCIVEDIFVEDIBVEDCIVEDSF VEDSFControl ControlVED control functionNRAECSPNE:VEDFor a specific call, theassociation is either

40、with theincoming or outgoing side.ITU-T Rec. Q.115.0 for stand-alone SPNE:VED; implementation-dependent for integrated SPNE:VEDBearer BearerThis RecommendationFigure 1 Voice enhancement control 4 ITU-T Rec. Q.115.2 (01/2007) 6.2 SPNE:VED The SPFs of a VED can be controlled by the VECL described in t

41、his Recommendation, if the SPNE:VED does provide a VEDCF. This applies to stand-alone as well as integrated SPNE:VEDs. Figure 2 shows a block diagram of a SPNE:VED with a control interface. Environment andterminal characteristicsNoiseAcousticechoAEC NRSPF1 SPF2VEDCFSinSoutRoutRinRRSSinoutinoutReceiv

42、e in portSend out portSend in portReceive out portControl interface: Integrated VED: control is implementation-dependent. Stand-alone VED: see ITU-T Rec. Q.115.0.Figure 2 SPNE:VED (AEC and NR controlled by VECL) 6.3 Voice enhancement control logic 6.3.1 General principles The voice enhancement contr

43、ol logic (VECL) is invoked for voice calls during call set-up, when recognizing the need for the provisioning of a voice enhancement device/function. The need for providing voice enhancement may be based on specific information, e.g., the subscriber profile, origin/destination-dependent responsibili

44、ties (agreements) or simply on the fact that voice enhancement devices/functions are available. The network operator can administer the use of TFO or VED for connections where both mechanisms TFO and VED are available. The voice enhancement control logic analyses the voice enhancement control inform

45、ation received via the signalling systems/protocols (if none is received, information from a local database or subscriber profile may be used instead), as well as origin/destination-related information that is stored in the database of the call/bearer control node. Based on all these data, the voice

46、 enhancement control logic determines: a) VED-related actions (i.e., enable/disable) on the VED under control; and b) the VED information that has to be transmitted by the signalling systems/protocols in their call set-up messages. The voice enhancement control logic does not directly control the VE

47、D. It is the task of the VED switching function which communicates the result of the voice enhancement control logic to the VED control function (master-slave relation). Protocols to be used between the VED switching function and the VED control function are described in ITU-T Q.115.0. ITU-T Rec. Q.

48、115.2 (01/2007) 5 The voice enhancement control logic is applicable to any mobile-originating or mobile-terminating call, irrespective of the peer entity connected to the same network (arrow 2 in Figure 3) or another (mobile) network (arrow 1 in Figure 3). A VED may be provided not only for the own

49、mobile subscriber(s), based on e.g., the subscriber profile, but also for a (mobile) subscriber connected to another network, based on origin- and destination-related information respectively. Access network signalling Core network signallingRadio subsystemaccess networkNetwork subsystemcore network(1)(2)* Possible locations for VED(1) Connection between a mobile subscriber and a (mobile) subscriber belonging to another (mobile) network(2) Connection between two mobile subscribers belonging to the same service provider*MSCCS-MGWFigure 3 Ba

copyright@ 2008-2019 麦多课文库(www.mydoc123.com)网站版权所有
备案/许可证编号:苏ICP备17064731号-1