Audio-Band Data Embedding With Matched-Filter Synchronization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing audio signal transmission schemes, particularly analog type, face challenges in minimizing distortion and effectively adding and detecting data within the audio frequency band, which hinders acoustic communication and sound quality.
Innovation Solution
A system and method that includes a data input unit to add data to an audio signal, a transmitting unit to send the audio signal in the audio frequency band, and a receiving unit for synchronized data extraction using matched filtering, with frequency-axis transformations and adjustments to minimize distortion and facilitate data detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If data are added to an audio signal for acoustic communication, then data transmission capability is improved, but audio signal distortion increases and sound quality deteriorates
Solution Approach 1:
The patent applies local quality by embedding data in specific frequency bands of the audio signal rather than uniformly across the entire spectrum. The data embedding is performed in selected frequency regions where it causes minimal perceptible distortion, thus maintaining local audio quality while enabling data transmission.
Solution Approach 2:
The patent utilizes parameter changes by modifying audio signal parameters (such as frequency, amplitude, or phase) in a controlled manner to embed data. By carefully adjusting these parameters within acceptable ranges, the system achieves data embedding while maintaining audio quality within perceptual thresholds.
2Adaptability or versatility
If data are embedded in the audio frequency band, then acoustic communication is enabled, but it becomes difficult to effectively add and detect the data
Solution Approach 1:
The patent employs feedback mechanisms where the receiving device uses reference signals and correlation processing to detect embedded data. The system continuously adjusts detection parameters based on received signal characteristics, improving detection accuracy despite the challenging audio frequency band environment.
Solution Approach 2:
The patent applies preliminary action by pre-processing the audio signal and preparing detection templates before data embedding. The receiving end has pre-stored reference signals and detection algorithms ready, enabling efficient and accurate data extraction from the embedded audio signal.
3Device complexity
If analog audio signal transmission is used, then simple implementation is achieved, but sound quality degrades during transmission
Solution Approach 1:
The patent replaces traditional analog mechanical signal transmission with a digital signal processing approach. By converting analog signals to digital form, embedding data in the digital domain, and then converting back to analog for transmission, the system achieves both implementation feasibility and improved sound quality through digital processing advantages.
Data Source
AI summary
Disclosed are a system and a method for transceiving data in an audio frequency band. The system includes a data input unit to input data for acoustic communication into an audio signal, a transmitting unit to transmit the audio signal including the data in the audio frequency band, and a receiving unit that receives the audio signal including the data and performs synchronization of the audio signal through a matched filtering using a matched filter in order to extract the data according to predetermined extraction processing. The data to be transmitted are added to an audio signal and the audio signal is transmitted in the audio frequency band, so that the data for the acoustic communication are effectively transmitted to the recipient in the audio frequency band.