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PERFOMANCE EVALUATION OF

DIFFERENT

SPEECH CODER

Prepared By:Milan Rathod

Pragnesh Patel

Darpan Patel

Vicky Patel

Guided By:Vijayendra Desai

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Introduction

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SPEECH MODEL AND CODING

Origin of Speech Signal

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SPEECH MODEL AND CODING

CLASSIFICATION OF SPEECH SIGNALS

MODELLING THE SPEECH PRODUCTION

SYSTEM

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SPEECH MODEL AND CODING

OVERVIEW OF SPEECH CODING

Properties of Speech Coder

Applications of Speech Coders

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DIAGRAM OF A SPEECH CODER

Properties of Speech Coder

Applications of Speech Coders

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Classification of speech coders

Classification by Coding Techniques

Category Bit Rate Range

High bit-rate >15 Kbps

Medium bit-rate 5 to 10 Kbps

Low bit-rate 2 to 5 Kbps

Very bit-rate

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EVALUATION METHOD

Subjective quality measurement

1. ACR test

2. DCR test Objective quality measurement

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ACR METHODS OF SUBJECTIVE

QUALITY MEASURMENT

How it performed?

ACR RATING

CATEGORY RATING

5 EXCELLENT

4 GOOD

3 FAIR

2 POOR

1 BAD

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DCR METHODS OF SUBJECTIVE

QUALITY MEASURMENT

How it performed?

DCR RATING

CATEGORY RATING

5 Inaudible

4 Audible but not annoying

3 Slightly annoying

2Annoying

1 Very annoying

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The background noise alone using a five-point

scale of background intrusiveness (BAK)

Rating Description

5 Not noticeable

4 Somewhat noticeable

3 Not intrusive

2 Somewhat intrusive

1 Very intrusive

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The overall quality using the scale of the mean

opinion score (MOS)

Rating Description

5 Excellent

4 Good

3 Fair

2 Poor

1 Bad

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OBJECTIVE MEASURES

correlation coefficient

PESQ

LPC-Based Objective Measures

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Time-Domain and Frequency-Weighted SNRMeasures

WSS Measures

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COMPOSITE MEASURES

Combining basic objective measure

Multiple linear regression analysis and MARS

analysis SIG,BAK,OVRL

Correlate Highly with subjective rating

Subset measures

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RESULT

Original

speech

Compressed

speech

Overall

quality

Signal

distortion

Back ground

distortion

CELP-10200.wav 3.9147 4.6669 3.8185

CELP-7950.wav 3.7527 3.0620 4.5204

Doormono.wave

CELP-5900.wav 3.5535 3.0683 4.5083

CELP-4700.wav 3.6258 4.3641 3.3879

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RESULT FOR SUBJECTIVE ANALYSIS

SPEECH AMOS DMOS

Ninandvoice_2.73kbps.wav 3.64 3.35

Ninandvoice_2.3kbps.wav 3.64 3.21

Ninandvoice_2.15kbps.wav 3.50 3.14

Ninandvoice_2.05kbps.wav 3.21 3.07

Ninandvoice_1.8kbps.wav 3.07 2.64

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Conclusion

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Thank you..