DT2118 Speech and Speaker Recognition - Introduction · DT2118 Speech and Speaker Recognition...

DT2118Speech and Speaker Recognition

Introduction

Giampiero Salvi

KTH/CSC/TMH giampi@kth.se

VT 2016

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Outline

Course Organization

IntroductionThe Big PictureChallenges

Models of Speech ProductionSource/Filter Model: Vowel-like soundsSource/Filter Model, General Case

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Outline

Course Organization

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Contact Info

Giampiero Salvi (giampi@kth.se)

All communications handled through the courseweb:

https://www.kth.se/social/course/DT2118/

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Course Objectivesafter the course you should be able to:

I implement simple training and evaluation methods forHidden Markov Models

I train and evaluate a speech recogniser using softwarepackages

I compare different feature extraction and trainingmethods

I document and discuss specific aspects related to speechand speaker recognition

I with the help of the literature, review and criticise otherstudents’ work in the subject

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Schedule

Part 1 Introduction, Speech Signal, Features,Statistics (ca 4 hours)

Part 2 Hidden Markov Models, Training andDecoding, Acoustic Models(ca 4-6 hours)

Part 3 Decoding and Search Algorithms(ca 2 hours)

Part 4 Language Models (Grammars)(ca 2 hours)

Part 5 Noise robustness and SpeakerRecognition (ca 2-4 hours)

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Literature

I Spoken Language Processing: A Guide to Theory,Algorithm, and System Development

Xuedong Huang, Alex Acero, Hsiao-Wuen Hon, Prentice Hall

I 3 at KTH library,I 6 at TMH library (against 300 SEK deposit)

I Automatic Speech Recognition: A deep learning approach

Dong Yu and Li Deng, Springer 2015

Available in PDF from SpringerLink (via KTH Biblioteket)

I HTK manual version 3.4

I selected research articles

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Reading Instructions (course book)These are indicative, check the schedule for more updated instructions

pages # pagesPart 1 (Spoken Language Structure) (19–71) (52)

Digital Signal Processing (201–273) 73Probability, Statistics and Inform. Theory 73–131 59Pattern Recognition 133–197 65Speech Signal Representations 275–336 62

Part 2 Hidden Markov Models 377–413 37Acoustic Modeling 415–475 61Environmental Robustness 477–544 68HTK tutorial (HTK book)

Part 3 Basic Search Algorithms 591–643 53(Large-Vocabulary Search Algorithms) (645–685) (41)(Applications and User Interfaces) (919–956) (38)

Part 4 Language Modeling 545–590 46Part 5 Speaker Recognition literature

(Optional chapters in parentheses)

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Requirements/Activities

Grades: Pass/FailIn order to pass you have to:

1. carry out three labs and hand in the report

2. carry out mini-project in groups and writereport (paper)

3. review other students’ report

4. present your work at final seminar

5. discuss other student’s work at final seminar

6. submit final version of the paper

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Lab 1: Speech Feature Extraction

I implement extraction for typical speech features

I analyse the features on speech data

I compare utterances with Dynamic TimeWarping

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Lab 2: Gaussian Hidden Markov Models

I implement the decoding algorithms for HMMs

I implement the training algorithms for HMMs

I test the algorithms on isolated digits

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Lab 3: Continuous Speech Recognitionand Deep Learning

I Extend the training and testing algorithms tocontinuous speech

I test the algorithms on the TIDIGIT database(connected digits)

I Optional: implement DNNs using Theano,compare with GMM-HMMS

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Project report

I Suggest a title or choose a topic from a list

I Project report in form of research paper

I Suggested topics:

Own work and experiments after discussion with the teacherLimitations in standard HMM and a survey of alternativesPronunciation variation and its importance for speech recogni-tionLanguage models for speech recognitionNew search methodsTechniques for robust recognition of speechConfidence measures in speech recognitionThe role of prosody for speech recognitionSpeaker variability and methods for adaptation

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Computational Resources at PDC

For Lab 3 and the Project

I apply for an account at https://www.pdc.kth.se/support/accounts/user

I use edu16.DT2118 when asked for timeallocation

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Important datesThu 14 April: submit Lab 1 report

Tue 19 April: decide topic for project

Thu 28 April: submit Lab 2 report

Thu 12 May: submit Lab 3 report

Wed 25 May: submit project report (draft). Neededfor the peer review.

Sun 29 May: submit review of other report

Tue 31 May: Final seminar: present own projectresults, and discuss others’

Mon 6 Jun: Final report

KTH Social deadlines are set at 23:5515 / 54

Part 1

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Outline

Course Organization

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Motivation

I Natural way of communication (No trainingneeded)

I Leaves hands and eyes free (Good forfunctionally disabled)

I Effective (Higher data rate than typing)

I Can be transmitted/received inexpensively(phones)

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The dream of Artificial Intelligence

2001: A space odyssey (1968)

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A very long endeavour1952, Bell laboratories, isolated digit recognition,single speaker, hardware based [1]

An underestimated challenge:60 years of bold announcements

[1] K. H. Davis, R. Biddulph, and S. Balashek. “Automatic Recognition of Spoken Digits”. In: JASA 24.6 (1952),pp. 637–642

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A very long endeavour1952, Bell laboratories, isolated digit recognition,single speaker, hardware based [1]

An underestimated challenge:60 years of bold announcements

[1] K. H. Davis, R. Biddulph, and S. Balashek. “Automatic Recognition of Spoken Digits”. In: JASA 24.6 (1952),pp. 637–642

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Today’s Reality

I Now Pronounce You Chuck & Larry (2007)

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The ASR Goal (for this course)Convert speech into text

AutomaticSpeech

Recognition“My name is . . . ”

[confidence score]

CC Please tell me your nameLV Larry ValentineCC I’m sorry, I didn’t quite get thatLV Larry ValentineCC You said “Berry Schmallenpine”. . . is that

right?LV Schmallenpine?!?!CC You said “Schmallenpine”. . . is that right?

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AutomaticSpeech

[confidence score]

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AutomaticSpeech

[confidence score]

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AutomaticSpeech

[confidence score]

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AutomaticSpeech

[confidence score]

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ASR in a Broader Context

DialogueManager

AutomaticSpeech

Recognition

SpokenLanguage

UnderstandingText to Speech

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The Speech Chain

musclesVocal

Feedbacklink

Sensorynerves

Motornerves

Sensorynerves

levelLinguistic

levelPhysiological

levelAcoustic

levelPhysiological

levelLinguistic

EarBrain

BrainSound waves

SPEAKER LISTENER

Peter Denes, Elliot Pinson, 196324 / 54

ASR versus Computer Vision

Peter Denes, Elliot Pinson, 1963

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ASR versus Computer Vision

Property ASR Computer Visionsignal originatesfrom:

cognition + physics physics

persistence: disappears as soon asheard

continually available(active perception)

across countries: different languages same objectstype of interac-tion:

two-way one-way

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The Speech Chain (from the book)

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Not covered in this course:

I multimodality

I interaction (bi-directional)

I incrementality

I non-verbal communication

musclesVocal

Feedbacklink

Sensorynerves

Motornerves

Sensorynerves

levelLinguistic

levelPhysiological

levelAcoustic

levelPhysiological

levelLinguistic

EarBrain

BrainSound waves

SPEAKER LISTENER

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http://www.itl.nist.gov/iad/mig/publications/ASRhistory/

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Main variables in ASR

Speaking mode isolated words vs continuous speech

Speaking style read speech vs spontaneous speech

Speakers speaker dependent vs speakerindependent

Vocabulary small (<20 words) vs large (>50 000words)

Robustness against background noise

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Challenges — VariabilityBetween speakers

I AgeI GenderI AnatomyI Dialect

Within speaker

I StressI EmotionI Health conditionI Read vs SpontaneousI Adaptation to

environment (Lombardeffect)

I Adaptation to listener

Environment

I NoiseI Room acousticsI Microphone distanceI Microphone, telephoneI Bandwidth

Listener

I AgeI Mother tongueI Hearing lossI Known / unknownI Human / Machine

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Example: spontaneous vshyper-articulated

Va jobbaru me Vad jobbar du med

“What is your occupation”(“What work you with”)

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Examples of reduced pronunciation

Spoken Written In EnglishTesempel Till exempel for exampleahamba och han bara and he justbafatt bara for att just becausejavende jag vet inte I don’t know

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Microphone distanceHeadset

2 m distance

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Applications today

Call centers:

I traffic information

I time-tables

I booking. . .

Accessibility

I Dictation

I hand-free control (TV, video, telephone)

Smart phones

I Siri, Android. . .

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Outline

Course Organization

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Speech Examples

TIMIT database (American English)

example of “clean” speech

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Elements of Signal Processing

I continuous/digital signals

I Linear and Time Invariant (LTI) systems

I impulse response and convolution

I Fourier transform and transfer function

I sampling theorem

I short-time Fourier transform

(Chapter 5 in the book)

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Speech Examples

live examples

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Physiology

Esophagus

Larynx

Soft palate(velum)

Hard palate

Trachea

Oral cavity

TongueLip

Nostril

Nasal cavity

Diaphragm

cavityPharyngeal

��

Trachea

Muscle Force and Relaxation

FoldsVocal

Glottis

PharyngealCavity Cavity

Cavity

NoseOutput

MouthOutput

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Source/Filter Model, Vowel-like sounds

Vowels

Esophagus

Larynx

Soft palate(velum)

Hard palate

Trachea

Oral cavity

TongueLip

Nostril

Nasal cavity

Diaphragm

cavityPharyngeal

��

� Source (periodic)� Front Cavity� Back Cavity� Back Cavity (2ndapprox.)

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Glottal Flow

��

Trachea

FoldsVocal

Glottis

Cavity

NoseOutput

MouthOutput

0 5 10 15

Liljencrants−Fant glottal model

0 5 10 15

time (msec)

G (z) =1

(1− βz)2, β < 1

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Radiation form the Lips/Nose

��

Trachea

FoldsVocal

Glottis

Cavity

NoseOutput

MouthOutput

Problem of radiation at thelips plus diffraction about thehead too complicated.

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��

Trachea

FoldsVocal

Glottis

Cavity

NoseOutput

MouthOutput

Approx. with a piston in arigid sphere: solved but notin closed form

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��

Trachea

FoldsVocal

Glottis

Cavity

NoseOutput

MouthOutput

2nd approx: piston in an in-finite wall

R(z) ≈ 1− αz−1

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Tube Model of the Vocal Tract

Cavity

NoseOutput

MouthOutput

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Tube Model (cntd.)k k+1

0 1 2 3 4 5 6 7 8

all−pole transfer function

freqency (kHz)

I assume planar wave propagation and losslesstubes

I solve pressure p(x , t) and velocity u(x , t) ineach tube according to wave equation

I impose continuity of pressure and velocity atthe junctions

⇒ all-pole transfer function (N = number of tubes)

V (z) =Az−N/2

1−∑N

k=1 akz−k

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Tube Model (cntd.)k k+1

0 1 2 3 4 5 6 7 8

all−pole transfer function

freqency (kHz)

I assume planar wave propagation and losslesstubes

I solve pressure p(x , t) and velocity u(x , t) ineach tube according to wave equation

I impose continuity of pressure and velocity atthe junctions

⇒ all-pole transfer function (N = number of tubes)

V (z) =Az−N/2

1−∑N

k=1 akz−k

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Source/Filter Model: vowel-like sounds

0 5 10 15

waveform

0 2 4 6 8

spectrum (log)

0 5 10 15 0 2 4 6 8

0 5 10 15

time (msec)

0 2 4 6 8

freqency (kHz)

← p[n]

← p[n] ∗ g [n]

← p[n] ∗ g [n] ∗ r [n]

← p[n]∗g [n]∗r [n]∗v [n]

��

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0 5 10 15

waveform

0 2 4 6 8

spectrum (log)

0 5 10 15 0 2 4 6 8

0 5 10 15

time (msec)

0 2 4 6 8

freqency (kHz)

← p[n]

← p[n] ∗ g [n]

← p[n] ∗ g [n] ∗ r [n]

← p[n]∗g [n]∗r [n]∗v [n]

��

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0 5 10 15

waveform

0 2 4 6 8

spectrum (log)

0 5 10 15 0 2 4 6 8

0 5 10 15

time (msec)

0 2 4 6 8

freqency (kHz)

← p[n]

← p[n] ∗ g [n]

← p[n] ∗ g [n] ∗ r [n]

← p[n]∗g [n]∗r [n]∗v [n]

��

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0 5 10 15

waveform

0 2 4 6 8

spectrum (log)

0 5 10 15 0 2 4 6 8

0 5 10 15

time (msec)

0 2 4 6 8

freqency (kHz)

← p[n]

← p[n] ∗ g [n]

← p[n] ∗ g [n] ∗ r [n]

← p[n]∗g [n]∗r [n]∗v [n]

��

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0 5 10 15

waveform

0 2 4 6 8

spectrum (log)

0 5 10 15 0 2 4 6 8

0 5 10 15

time (msec)

0 2 4 6 8

freqency (kHz)

← p[n]

← p[n] ∗ g [n]

← p[n] ∗ g [n] ∗ r [n]

← p[n]∗g [n]∗r [n]∗v [n]

��

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F0 and Formants

I Varying F0 (vocal fold oscillation rate)

0 2 4 6 8

spectrum (log) f0 = 100Hz

freqency (kHz)

0 2 4 6 8

freqency (kHz)

I Varying Formants (vocal tract shape)

0 2 4 6 8

spectrum (log) vowel [ε]

freqency (kHz)

0 2 4 6 8

spectrum (log) vowel [u]

freqency (kHz)

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F0 and Formants

I Varying F0 (vocal fold oscillation rate)

0 2 4 6 8

freqency (kHz)

0 2 4 6 8

freqency (kHz)

I Varying Formants (vocal tract shape)

0 2 4 6 8

spectrum (log) vowel [ε]

freqency (kHz)

0 2 4 6 8

spectrum (log) vowel [u]

freqency (kHz)

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Source/Filter Model, General Case

Vowels

Esophagus

Larynx

Soft palate(velum)

Hard palate

Trachea

Oral cavity

TongueLip

Nostril

Nasal cavity

Diaphragm

cavityPharyngeal

��

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Fricatives (e.g. sh) or Plosive (e.g. k)

Esophagus

Larynx

Soft palate(velum)

Hard palate

Trachea

Oral cavity

TongueLip

Nostril

Nasal cavity

Diaphragm

cavityPharyngeal

��

� Source (noise orimpulsive)� Front Cavity� Back Cavity� Back Cavity (2ndapprox.)

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Fricatives (e.g. s) or Plosive (e.g. t)

Esophagus

Larynx

Soft palate(velum)

Hard palate

Trachea

Oral cavity

TongueLip

Nostril

Nasal cavity

Diaphragm

cavityPharyngeal

��

� Source (noise orimpulsive)� Front Cavity� Back Cavity� Back Cavity (2ndapprox.)

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Nasalised Vowels

Esophagus

Larynx

Soft palate(velum)

Hard palate

Trachea

Oral cavity

TongueLip

Nostril

Nasal cavity

Diaphragm

cavityPharyngeal

��

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Source/Filter Model: fricative sounds

0 5 10 15

waveform

0 2 4 6 8

spectrum (log)

0 5 10 15 0 2 4 6 8

0 5 10 15

time (msec)

0 2 4 6 8

freqency (kHz)

← p[n]

← p[n] ∗ r [n]

← p[n] ∗ r [n] ∗ v [n]

��

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Complete Source/Filter Model

AvωG( )

ωV( ) ωR( )fricative

plosive

Source

voiced

Filter

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IPA Chart: Consonants

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IPA Chart: Vowels

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Phonology vs Phonetics

Phonemes

co-articulation, speakingstyle, dialogue, reduction,

assimilation, speakerdifferences, environment

(loudness, channel,room acoustics, noise)

Phones

Sounds

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Phonology vs Phonetics

Phonemes

co-articulation, speakingstyle, dialogue, reduction,

assimilation, speakerdifferences, environment

(loudness, channel,room acoustics, noise)

Phones

Sounds

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Components of ASR System

Speech SignalSpectralAnalysis

FeatureExtraction

Searchand Match

Recognised Words

Acoustic Models

Lexical Models

Language Models

Representation

Constraints - KnowledgeDecoder

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DT2118 Speech and Speaker Recognition - Introduction · DT2118 Speech and Speaker Recognition...

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