RESEARCH

Acoustic & Speech

Investigates various Speech signal processing schemes for acoustic modeling so that more robust speech recognition can be achieved. Our aim is to perform the state-of-art research providing effective means for achieving:

 Speaker Verification : From Research to Reality

Admin    2021-04-08    👁️ 498

 Speaker Verification : From Research to Reality

     Contents

1. Introduction

2. Procedure of Speaker Verification

3. Features for speaker Verification

4. Applications

1. Introduction        

  1.1 Speaker Recognition : the process of automatically recognizing who is speaking on the basis of individual information included in speech waves which can be classified into identification and verification.

• Speaker Identification : the process of classifying an unlabeled input voice sample as one of a group of known speakers. (N possible outcomes)

• Speaker Verification : the process of verifying whether an unknown speaker is the person as claimed. (2 possible outcome - Accept or Reject)

  1.2  Speaker Verification :: speech modalities

• Text-Dependent Speaker Verification

• Text-Independent Speaker Verification

• Text-Prompted Speaker Verification

2. Procedure of Speaker Verification       

2.1 Enrollment(Training) process

  2.2 Verification process

• Two types of errors

  • False Rejection Rate(FRR) : incorrectly reject a speaker

  • False Acceptance Rate(FAR) : increctly accept an imposter

3. Features for speaker verifcation        

  3.1 Key information of speaker verification

• Vocal tract

• Glottis : effect on pitch, voiced sounds, fundamental frequency

• Nasal cavity

• Organization of teeth, plate, lip’s effect etc.

  3.2 Analysis of the inherent speech information : Feature extraction

• Short-term, long-term spectrum

• Energy, fundamental frequency etc.

• Parameter transformation to separate the speaker’s identity

4. Applications       

• Access Control : Physical facilities, Computer networks and websites

• Transaction Authenitcation : Telephone banking, Remote credit card purchases

• Speech Data Management : Voice mail browsing, Speech skimming

• Personalization : Intelligent answering machine, Voice/device customization

• Law Enforcement : Forensics, Home parole