SF/T 0150-2023 in English
VALIDTechnical specification for forensic identification of audio recording device
- Issued on:2023-10-07
- Implemented on:2023-12-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
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本文件规定了声像资料鉴定中录音设备鉴定的设备和工具、步骤和方法以及鉴定意见。
本文件适用于司法鉴定领域声像资料鉴定中的录音设备鉴定。
Introduction
Standard Revision Background and Technology Evolution
This standard replaces SF/Z JD0301002-2015 version. The main technical upgrades are: new digital watermark analysis, improvement of equipment inspection system and refinement of identification opinion classification. The revision reflects the current demand for electronic evidence identification in the field of new recording devices such as smartphones.
Core terminology definitions
| Terms | Definition | Identification significance |
|---|---|---|
| Characteristic signal | Audio mark generated by device operation | Identify device operation fingerprint |
| Noise floor | Equipment inherent electroacoustic noise | Key features for device identification |
| Recording equipment to be inspected | Equipment suspected of recording inspection materials | Inspection comparison benchmark object |
Key nodes of the inspection process
Typical inspection scenarios
In a loan dispute case, by comparing The background noise spectrum correlation (0.92) between the class=instrument>iPhone 13 recording sample and the disputed recording, combined with the encoder identifier in the metadata, ultimately resulted in a "positive identity" opinion.
Comparison of inspection methods
| Methods | 2015 version | 2023 version |
|---|---|---|
| Digital watermark analysis | Not included | New chapter 5.5.8 |
| Data recovery | Briefly mentioned | Independent chapter 5.5.2 |
Key points for implementation of appraisal opinions
The judgment of the six types of opinions requires comprehensive consideration: degree of feature consistency, feature stability and environmental interference factors. Special attention should be paid to "no signs of non-identity" (6.2.3) as a new type of opinion, which is applicable to situations where the evidence is insufficient but there are no contradictions.
Opinion Level Comparison Table
| Certainty | Opinion Type | Technical Requirements |
|---|---|---|
| Certainty | Affirmation/Negation of the Same | 3+ Unique Feature Matches |
| Tendency | Tendency Opinion | 2 Significant Feature Matches |
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