Speech Processing for IP Networks
Media Resource Control Protocol (MRCP)
Published on 13. March 2007
368 pages
978-0-470-06060-5 (ISBN)
Description
Media Resource Control Protocol (MRCP) is a new IETF protocol,providing a key enabling technology that eases the integration ofspeech technologies into network equipment and accelerates theiradoption resulting in exciting and compelling interactive servicesto be delivered over the telephone. MRCP leverages IPtelephony and Web technologies such as SIP, HTTP, and XML(Extensible Markup Language) to deliver an open standard,vendor-independent, and versatile interface to speechengines.
Speech Processing for IP Networks brings thesetechnologies together into a single volume, giving the reader asolid technical understanding of the principles of MRCP, how itleverages other protocols and specifications for its operation, andhow it is applied in modern IP-based telecommunicationnetworks. Focusing on the MRCPv2 standard developed by theIETF SpeechSC Working Group, this book will also provide anoverview of its precursor, MRCPv1.
Speech Processing for IP Networks:
* Gives a complete background on the technologies required byMRCP to function, including SIP (Session Initiation Protocol), RTP(Real-time Transport Protocol), and HTTP (Hypertext TransferProtocol).
* Covers relevant W3C data representation formats includingSpeech Synthesis Markup Language (SSML), Speech Recognition GrammarSpecification (SRGS), Semantic Interpretation for SpeechRecognition (SISR), and Pronunciation Lexicon Specification(PLS).
* Describes VoiceXML - the leading approach for programmingcutting-edge speech applications and a key driver to thedevelopment of many of MRCP's features.
* Explains advanced topics such as VoiceXML and MRCPinterworking.
This text will be an invaluable resource for technical managers,product managers, software developers, and technical marketingprofessionals working for network equipment manufacturers, speechengine vendors, and network operators. Advanced students oncomputer science and engineering courses will also find this to bea useful guide.
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Person
David Burke is Chief Technology Officer and co-founder ofVoxpilot Ltd, UK. David led Voxpilot to its current positionas a leader in VoiceXML interactive services platform technology.His management duties at Voxpilot include executive management andcounsel, product vision, direction and management, responsibilityfor all R&D activities including budgeting, engineering teamselection and mentoring, and architecture and design.
He is also member of the World Wide Web Consortium (W3C) VoiceBrowser Working Group and of the Internet Engineering Task Force(IETF) Speech SC Working Group.
Content
PART I. BACKGROUND.
1. Introduction.
1.1 Introduction to Speech Applications.
1.2 The MRCP Value Proposition.
1.3 History of MRCP Standardisation.
1.3.1 Internet Engineering Task Force.
1.3.2 World Wide Web Consortium.
1.3.3 MRCP: From Humble Beginnings Toward IETF Standard.
1.4 Summary.
2. Basic Principles of Speech Processing.
2.1 Human Speech Production.
2.1.1 Speech Sounds: Phonemics and Phonetics.
2.2 Speech Recognition.
2.2.1 Endpoint Detection.
2.2.2 Mel-Cepstrum.
2.2.3 Hidden Markov Models.
2.2.4 Language Modelling.
2.3 Speaker Verification and Identification.
2.3.1 Feature Extraction.
2.3.2 Statistical Modelling.
2.4 Speech Synthesis.
2.4.1 Front-end Processing.
2.4.2 Back-end Synthesis.
2.5 Summary.
3. Overview of MRCP.
3.1 Architecture.
3.2 Media Resource Types.
3.3 Network Scenarios.
3.3.1 VoiceXML IVR Service Node.
3.3.2 IP PBX with Voicemail.
3.3.3 Advanced Media Gateway.
3.4 Protocol Operation.
3.4.1 Establishing Communication Channels.
3.4.2 Controlling a Media Resource.
3.4.3 Walkthrough Examples.
3.5 Security.
3.6 Summary.
PART II. MEDIA AND CONTROL SESSIONS.
4. Session Initiation Protocol.
4.1 Introduction.
4.2 Walkthrough Example.
4.3 SIP URIs.
4.4 Transport.
4.5 Media Negotiation.
4.5.1 Session Description Protocol.
4.5.2 Offer/Answer Model.
4.6 SIP Servers.
4.6.1 Registrars.
4.6.2 Proxy Servers.
4.6.3 Redirect Servers.
4.7 SIP Extensions.
4.7.1 Capability Discovery.
4.8 Security.
4.8.1 Transport and Network Layer Security.
4.8.2 Authentication.
4.8.3 S/MIME.
4.9 Summary.
5. Session Initiation in MRCP.
5.1 Introduction.
5.2 Initiating the Media Session.
5.3 Initiating the Control Session.
5.4 Session Initiation Examples.
5.4.1 Single Media Resource.
5.4.2 Adding and Removing Media Resources.
5.4.3 Distributed Media Source/Sink.
5.5 Locating Media Resource Servers.
5.5.1 Requesting Server Capabilities.
5.5.2 Media Resource Brokers.
5.6 Security.
5.7 Summary.
6. The Media Session.
6.1 Media Encoding.
6.1.1 Pulse Code Modulation (PCM).
6.1.2 Linear Predictive Coding (LPC).
6.2 Media Transport.
6.2.1 Real-Time Protocol (RTP).
6.2.2 DTMF.
6.3 Security.
6.4 Summary.
7. The Control Session.
7.1 Message Structure.
7.1.1 Request Message.
7.1.2 Response Message.
7.1.3 Event Message.
7.1.4 Message Bodies.
7.2 Generic Methods.
7.3 Generic Headers.
7.4 Security.
7.5 Summary.
PART III. DATA REPRESENTATION FORMATS.
8. Speech Synthesis Markup Language (SSML).
8.1 Introduction.
8.2 Document Structure.
8.3 Recorded Audio.
8.4 Pronunciation.
8.4.1 Phonemic/Phonetic Content.
8.4.2 Substitution.
8.4.3 Interpreting Text .
8.5 Prosody.
8.5.1 Prosodic Boundaries.
8.5.2 Emphasis.
8.5.3 Speaking Voice.
8.5.4 Prosodic Control.
8.6 Markers .
8.7 Metadata.
8.8 Summary.
9. Speech Recognition Grammar Specification (SRGS).
9.1 Introduction.
9.2 Document Structure.
9.3 Rules, Tokens, and Sequences.
9.4 Alternatives.
9.5 Rule References.
9.5.1 Special Rules.
9.6 Repeats.
9.7 DTMF Grammars.
9.8 Semantic Interpretation.
9.8.1 Semantic Literals.
9.8.2 Semantic Scripts.
9.9 Summary.
10. Natural Language Semantics Markup Language (NLSML).
10.1 Introduction.
10.2 Document Structure.
10.3 Speech Recognition Results.
10.3.1 Serialising Semantic Interpretation Results.
10.4 Voice Enrollment Results.
10.5 Speaker Verification Results.
10.6 Summary.
11. Pronunciation Lexicon Specification (PLS).
11.1 Introduction.
11.2 Document Structure.
11.3 Lexical Entries.
11.4 Abbreviations and Acronyms.
11.5 Multiple Orthographies.
11.6 Multiple Pronunciations.
11.7 Summary.
PART IV. MEDIA RESOURCES.
12. Speech Synthesiser Resource.
12.1 Overview.
12.2 Methods.
12.2.1 SPEAK.
12.2.2 PAUSE.
12.2.3 RESUME.
12.2.4 STOP.
12.2.5 BARGE-IN-OCCURRED.
12.2.6 CONTROL.
12.2.7 DEFINE-LEXICON.
12.3 Events.
12.3.1 SPEECH-MARKER.
12.3.2 SPEAK-COMPLETE.
12.4 Headers.
12.5 Summary.
13. Speech Recogniser Resource.
13.1 Overview.
13.2 Recognition Methods.
13.2.1 RECOGNIZE.
13.2.2 DEFINE-GRAMMAR.
13.2.3 START-INPUT-TIMERS.
13.2.4 GET-RESULT.
13.2.5 STOP.
13.2.6 INTERPRET.
13.3 Enrollment Methods.
13.3.1 START-PHRASE-ENROLLMENT.
13.3.2 ENROLLMENT-ROLLBACK.
13.3.3 END-PHRASE-ENROLLMENT.
13.3.4 MODIFY-PHRASE.
13.3.5 DELETE-PHRASE.
13.4 Events.
13.4.1 START-OF-INPUT.
13.4.2 RECOGNITION-COMPLETE.
13.4.3 INTERPRETATION-COMPLETE.
13.5 Recognition Headers.
13.6 Enrollment Headers.
13.7 Summary.
14. Recorder Resource.
14.1 Overview.
14.2 Methods.
14.2.1 RECORD.
14.2.2 START-INPUT-TIMERS.
14.2.3 STOP.
14.3 Events.
14.3.1 START-OF-INPUT.
14.3.2 RECORD-COMPLETE.
14.4 Headers.
14.5 Summary.
15. Speaker Verification Resource.
15.1 Overview.
15.2 Methods.
15.2.1 START-SESSION.
15.2.2 END-SESSION.
15.2.3 VERIFY.
15.2.4 VERIFY-FROM-BUFFER.
15.2.5 VERIFY-ROLLBACK.
15.2.6 START-INPUT-TIMERS.
15.2.7 GET-INTERMEDIATE-RESULT.
15.2.8 STOP.
15.2.9 CLEAR-BUFFER.
15.2.10 QUERY-VOICEPRINT.
15.2.11 DELETE-VOICEPRINT.
15.3 Events.
15.3.1 START-OF-INPUT.
15.3.2 VERIFICATION-COMPLETE.
15.4 Headers.
15.5 Summary.
PART V. PROGRAMMING SPEECH APPLICATIONS.
16. Voice eXtensible Markup Language (VoiceXML).
16.1 Introduction.
16.2 Document Structure.
16.2.1 Applications and Dialogs.
16.3 Dialogs.
16.3.1 Forms.
16.3.2 Menus.
16.3.3 Mixed Initiative Dialogs.
16.4 Media Playback.
16.5 Media Recording.
16.6 Speech and DTMF Recognition.
16.6.1 Specifying Grammars.
16.6.2 Grammar Scope and Activation.
16.6.3 Configuring Recognition Settings.
16.6.4 Processing Recognition Results.
16.7 Flow Control.
16.7.1 Executable Content.
16.7.2 Variables, Scopes, and Expressions.
16.7.3 Document and Dialog Transitions .
16.7.4 Event Handling.
16.8 Resource Fetching.
16.9 Call Transfer.
16.10 Summary.
17. VoiceXML and MRCP Interworking.
17.1 Introduction.
17.2 Interworking Fundamentals.
17.2.1 Play Prompts.
17.2.2 Play and Recognise.
17.2.3 Record.
17.3 Application Example.
17.3.1 VoiceXML Scripts.
17.3.2 MRCP Flows.
17.4 Summary.
Appendix A. MRCP Version 1.
A.1 Overview.
A.2 Session Management and Message Transport.
A.3 General Protocol Details.
A.4 Speech Synthesiser Resource.
A.5 Speech Recogniser Resource.
Appendix B. XML Primer.
B.1 Background.
B.2 Basic Concepts.
B.3 Namespaces.
B.4 Document Schemas.
Appendix C. HTTP Primer.
C.1 Background.
C.2 Basic Concepts.
C.2.1 GET Method.
C.2.2 POST Method.
C.3 Caching.
C.4 Cookies.
C.5 Security.
References.
Index.
Acronyms.
