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T. T. Centrum. för talteknologi. Multi-modal expression of Swedish prominence Björn Granström Centre for Speech Technology, Department of Speech, Music and Hearing, KTH, Stockholm, Sweden. Historical background. Prosody for speech synthesis at KTH, together with Rolf Carlson

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Centrum

T

T

Centrum

för talteknologi

Multi-modal expression of Swedish prominenceBjörn Granström Centre for Speech Technology, Department of Speech, Music and Hearing, KTH, Stockholm, Sweden


Historical background

Historical background

  • Prosody for speech synthesis at KTH, together with Rolf Carlson

  • The Lund intonation model – Gösta Bruce et al.


Several joint projects

Several joint projects

Profs – Prosodic phrasing in Swedish ~1989-1992

Gösta Bruce, Björn Granström and more

First reference: G. Bruce and B. Granström. Modelling Swedish intonation in a text-to-speech system. STL-QPSR, 30(1):17-21, 1989. (on the KTH web)


Potentially ambiguous sentences varying in phrase boundary location

Potentially ambiguous sentences, varying in phrase boundary location


Entering greve piper s humble residence

Entering greve Piper´s humble residence


Several joint projects cont

Several joint projects, cont.

Prosodiag - Prosodic Segmentation and Structuring of Dialogue (HSFR + NUTEK) 1993 –1996

Gösta Bruce, Björn Granström, Kjell Gustafson, David House, Paul Touati

Project Description

The object of study is the prosody of dialogue in a language technology framework. The primary goal of the project is to increase our understanding of how prosodic aspects of speech are exploited interactively in dialogue and on the basis of this increased knowledge to be able to create a more powerful prosody model.

Late reference: Gösta Bruce, Johan Frid, Björn Granström, Kjell Gustafson, Merle Home, and David House. Prosodic segmentation and structuring of dialogue. TMH-QPSR, 37(3):1-6, 1996.

More than 20 joint publications – and then?


Much in the context of the annual phonetics meetings next

Much in the context of the annual phonetics meetings – next:


Project meetings in inspirering surroundings

Project meetings in inspirering surroundings


Probing many different cultures

..probing many different cultures


Is prosody more than sound

Is prosody more than sound?

  • Our bias: communication is multi-modal

  • Traditionally prosodic functions are signaled by “gestures”, perceived by “eye and ear”

  • This concerns both body and face gestures

  • Preliminary hypothesis: F0~eyebrow height - e.g. Cavé et al. (1996)

  • Easy to put to a test with multimodal speech synthesis


Eyebrow vs intonation

Eyebrow vs intonation

1 No eyebrow motion

2 Eyebrow motion

controlled by the

fundamental frequency

of the voice

3 Eyebrow motion at

focal accents +

4 Eyebrow motion at

the first focal accent +

“Jag heter Axel, inte Axell” (translation: “My name is Axel, not Axell”). In Sweden Axel is a first name as opposed to Axell, which is a family name.


Goals and research context

Goals and research context

  • How are visual expressions used to convey and strengthen prosodic functions?

  • Understand interactions between visual expressions, dialog functions and speech acoustics

  • Context: animated talking agent

    • Realistic communicative behavior using multimodal speech synthesis


Visual prosodic functions

Prominence

stress

focus

Phrasing

Utterance type

question

statement

Dialogue functions

back channeling

turntaking

Attitudes

Emotions

Visual prosodic functions


Visual prosody cont

Visual prosody cont.

  • What is underlying?

  • How tight is the AV connection?

  • What are the important visual gestures?

  • More optional than acoustic prosodic parameters?

  • Individual and cultural variation

  • Reinforcing or qualifying acoustics?


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Formal experimentProminence due to eyebrow rise5 content words: ”När pappafiskar stör piper Putte”When dad is fishing sturgeon, Putte is whimpering


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Example of stimuliTask: “which word is most prominent” (identical acoustics – varied location of eyebrow movement)

Eyebrow movement

No eyebrow movement (neutral)


Prominence increase due to eyebrow movement

Prominence increase due to eyebrow movement


Feedback experiment

Feedback experiment

  • Mini dialogues (two turns)

  • Travel agent application

  • Both visual and acoustic feedback cues

  • Affirmative cues – agent understands/accepts the request

  • Negative cues – agent is unsure about the request (seeks confirmation)

  • Six cues hypothesised

    Granström, House & Swerts (2002)


Pos neg feedback experiment

Pos/Neg feedback experiment

(Granström, House & Swerts 2002)


Recording of communicative interactions

Recording of communicative interactions

Automatic tracking of reflective spots in 3D (Qualisys)


Interactions emotion and articulation resynthesis from av speech database eu pf star project

Interactions: emotion and articulation (resynthesis)(from AV speech database – EU/PF_STAR project)


Measurement points for lip coarticulation analysis

Measurement points for lip coarticulation analysis

Vertical distance

left mouth corner

Lateral distance


The expressive mouth

The expressive mouth

”left mouth corner”

  • All vowels

    (sentences)

    • Encouraging

    • Happy

    • Angry

    • Sad

    • Neutral

(Svanfeldt et al. 2003)


Prompted read speech database

Prompted read speech database

  • Expressive modes:

    • Confirming, questioning, certain, uncertain, happy, (angry)

  • 39 short, content neutral sentences with three possible focal accent positions each, e.g.

    • Båten seglade förbi (The boat sailed by)

    • Dom flyttade möblerna (They moved the furniture)

  • Nonsense words (VCV, VCCV, CVC)

  • Digits


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    Mean eyebrow positions for one speaker


    Centrum

    Nose marker traces with automatic (blue) and two human (red)

    annotated head nods (adapted from Cerrato & Svanfeldt 2006)


    Examples from the database

    Examples from the database

    Focal accent on: Båten seglade förbi

    Confirming Happy


    Exploitation of visual parameters

    Exploitation of visual parameters

    • Visual cues exploited at focal accent

    • Mouth cues

      • Happy, encouraging

    • Eyebrow cues

      • Happy, questioning

    • Vertical head nods

      • Confirming


    Analysis in terms of fap and fmq

    Analysis in terms of FAP and FMQ

    MPEG-4 Facial Animation Parameter (FAP) A subset of 31 FAPs out of the 68 FAPs defined in the MPEG-4 standard, including only the ones that we were able to calculate directly from our measured point data

    Focal Motion Quotient, FMQ, defined as the standard deviation of a FAP parameter taken over a word in focal position, divided by the average standard deviation of the same FAP in the same word in non-focal position.


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    The focal motion quotient, FMQ, averaged across all sentences, for all measured MPEG-4 FAPs for several expressive modes

    articulation I smile I brows I head


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    The effect of focus on the variation of several groups of MPG-4 /FAP parameters, for different expressive modes

    FMQ (Focal Motion Quotient)


    The effect of focal accent on selected parameter variations in certain and uncertain readings

    The effect of focal accent on selected parameter variations in Certain and Uncertain readings

    FMQ (Focal Motion Quotient)


    What s next

    What´s next?

    • Better recordings

    • Detailed analysis of the eye region: ”Gaze and wrinkles”

    • Use in applications, e.g. spoken dialogue systems

    • And more audible prosody…….


    New cooperative project

    New cooperative project

    SIMULEKT - Simulering av svenskans prosodiska dialekttyper (Simulating intonational varieties of Swedish)

    VR 2007-2009

    And finally………..


    Congratulations well done g sta

    Congratulations! Well done Gösta!


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