GB/T 35048-2018 in English
VALIDTerminology for phonetics and acoustics examination in forensics
- Issued on:-
- Implemented on:2018-12-01
- File Format:PDF
- Delivery:Via email within 5 business days
$592.00
| Standard No: | GB/T 35048-2018 |
| Document status: | VALID |
| Title in English: | Terminology for phonetics and acoustics examination in forensics |
| Title in Chinese: | 法庭科学语音及音频检验术语 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 5 business days |
| Implemented on: | 2018-12-01 |
| ICS Classification: | 13.310-Protection against crime |
| Chinese Classification: | A92-Crime judging technology |
| Professional Classification: | GB-National Standard |
| Related Keywords: | standard terminology
acoustics examination forensic speech examination pronunciation habit identification acoustics forensics introduction standard framework |
| Related Topics: | Laboratory streamline
Voice 3.1khz voice laboratory medicine voice products Small laboratory Provincial inspection departments court GBT35048 GB/T 35048-2018 Laboratory Biochemistry Instrument Methodology Vehicle voice detection international forensic science |
《GB/T 35048-2018法庭科学语音及音频检验术语》由TC179（全国刑事技术标准化技术委员会）归口，TC179SC5（全国刑事技术标准化技术委员会刑事照相、录像分会）执行，主管部门为公安部。
Introduction
Standard Framework and Technological Evolution
This standard was jointly developed by the Ministry of Public Security's Physical Evidence Identification Center, the Supreme People's Procuratorate, a number of universities and research institutions, marking a new stage in the standardization of forensic speech examination in my country. The technology development context presents three major characteristics:
- Disciplinary integration: integrating knowledge from multiple fields such as linguistics, acoustics, and forensic identification
- Technical iteration: from traditional auditory analysis to digital voiceprint recognition system
- Driven by judicial needs: dealing with new types of cases such as telecommunications fraud and audio recording evidence identification
Analysis of the core terminology system
| Classification | Number of terms | Examples of key terms | Forensic application |
|---|---|---|---|
| Linguistics/Phonetics | 141 items | Voice onset time (VOT), burst sound, formant pattern | Dialect feature analysis, pronunciation habit identification |
| Acoustics and signal processing | 72 items | MFCC, linear prediction coding, hidden Markov model | Audio tampering detection, speech enhancement |
| Voiceprint inspection | 54 items | Dynamic range, essential difference, voice identity identification | Speaker recognition, recording authenticity identification |
Detailed explanation of key technical terms
3.1.52 Formant
Definition: The acoustic performance of vocal tract resonance that causes speech energy to gather in a specific frequency band. In forensic identification, it is used for:
- Vowel feature analysis (the first formant F1 reflects the degree of mouth opening, and the second formant F2 reflects the tongue position)
- Disguised speech recognition (formant frequency shift detection)
- Recording device tracing (differences in formant attenuation characteristics of different devices)
3.3.50 Voice Identity Recognition
Operational process:
| 1. Feature extraction | 12 parameters such as fundamental frequency, formant, and prosodic features |
| 2. Difference analysis | Distinguishing between essential and non-essential differences |
| 3. Comprehensive evaluation | Using Bayesian discriminant rule to calculate probability |
Recommendations for the implementation of the standard
Forensic appraisal institutions
- Establish a mapping relationship between standard terminology and voice workstation parameters
- Regulate the use of terminology in inspection reports (such as distinguishing between "dialect characteristics" and "social dialect")
Technical R&D units
- Algorithm development must be compatible with characteristic parameters such as Mel frequency cepstral coefficients defined in the standard
- Audio interface design should comply with 3.3.33 Digital Audio Interface Specification
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