SR

Question 1

What is Speech Recognition?

Answer 1

is the interdisciplinary subfield of computational linguistics that develops methodologies and technologies that enables the recognition and translation of spoken language into text by computers

Question 2

ASR

Answer 2

automatic speech recognition

Question 3

STT

Answer 3

speech to text

Question 4

Speech Signal:

Answer 4

Amplitude/Time

Question 5

Fundamental problem
1 Given:
2 Wanted:
3 Search:

Answer 5

1: an observation (ADC ,FFT) X = x1, x2, … , xT
2: the corresponding word sequence W = w1, w2, … , wm
3: the most likely word sequence W’

Question 6

W’

Answer 6

= arg max(w) P(W|X)

Question 7

P( W|X )

Answer 7

p( X|W ) * P( W ) / p( X )

Question 8

P( X|W ) The acoustic modeI

Answer 8

how likely is it to observe X when W is spoken

Question 9

P( W ) The language model

Answer 9

how likely is it W is spoken -priori

Question 10

What is X ?

Answer 10

The Problem of Pre-Processing (Vorverarbeitung)

Question 11

What is p( X|W ) ?

Answer 11

The Problem of Acoustic Modelling (Akustische Modellierung)

Question 12

What is P( W ) ?

Answer 12

The problem of Language Modelling (Sprachmodellierung)

Question 13

How do we find argmax W?

Answer 13

The Search problem (Suche)