Spectrogram-Based Audible Document Authentication
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Solution Overview
Problem
Current methods for visually impaired individuals to identify documents, particularly currency, lack reliability and can be easily counterfeited, as they rely on crude tactile features or require learning correlations between auditory signals and document properties.
Innovation Solution
Implementing a spectrogram, a time-frequency distribution of audible information, as a security feature on documents using document security means such as watermarks, laser-marking, or magnetic patterns, which can be read by a device to produce an audible sound signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If tactile features (embossing, punched holes) are used for document authentication, then the solution is simple and can be perceived by visually impaired people, but the reliability is insufficient and can be easily counterfeited
Solution Approach 1:
The patent replaces tactile mechanical features with acoustic fields. Instead of using embossing or punched holes that can be easily replicated, the invention uses acoustic waves to excite document security features, generating unique audible responses that are difficult to counterfeit. This substitution transitions from mechanical tactile detection to acoustic detection, resolving the contradiction between ease of manufacture and reliability.
2Measurement precision
If auditory features are used to provide finer distinction for document authentication, then the measurement precision improves, but the device complexity increases due to requirement of electronic devices
Solution Approach 1:
The patent enables the document itself to generate the authentication signal through its inherent security features. When acoustic waves excite the document, the document's security elements (watermarks, laser markings, magnetic patterns) naturally produce characteristic audible responses without requiring complex external analysis equipment. This self-service approach reduces device complexity while maintaining high measurement precision.
3Loss of information
If OCR and speech synthesizer are used to read character information, then information can be reproduced audibly, but the method requires information to be in recognizable character set and language which limits versatility
Solution Approach 1:
The patent extracts authentication information directly from the document's physical security features rather than relying on printed text. By detecting acoustic responses from watermarks, laser markings, and magnetic patterns, the system obtains information about the document's nature and denomination without needing OCR or speech synthesizers. This extraction approach eliminates language and character set limitations, greatly enhancing versatility.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Provides a robust and compact representation of audio information that is difficult to imitate, allowing for reliable authentication of documents and enabling the representation of any spoken language, enhancing security and usability for visually impaired individuals.
Implementation Method 1
a document or article carrying information for the audible authentication of said document or article, in that said information is present in or on the document or article in the form of a spectrogram
Data Source
AI summary
Disclosed is a document or article carrying information for the audible authentication of said document or article, wherein the information is present in or on said document or article in the form of a frequency-versus-time spectral density function (spectrogram), the spectrogram being embodied using document security means. Disclosed are further a method for producing said document or article; a reader device for displaying audible authentication information from said document or article, a method for authenticating said document or article and the use of a spectrogram for document authentication purposes.