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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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slide1

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)

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?

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?
slide15

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

slide16
Example of stimuliTask: “which word is most prominent” (identical acoustics – varied location of eyebrow movement)

Eyebrow movement

No eyebrow movement (neutral)

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
slide27

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.

slide31

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

slide32
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………..

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