Journal of the Korea Society of Computer and Information (한국컴퓨터정보학회논문지)

Korean Society of Computer Information (한국컴퓨터정보학회)
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An Ultrasonic Wave Encoder and Decoder for Indoor Positioning of Mobile Marketing System

  • Received : 2019.05.08
  • Accepted : 2019.06.10
  • Published : 2019.07.31
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Abstract

In this paper, we propose an intelligent marketing service system that can provide custom advertisements and events to both businesses and customers by identifying the location and contents using the ultrasonic signals and feature information in voice signals. We also develop the encoding and decoding algorithm of ultrasonic signals for this system and analyze the performance evaluation results. With the development of the hyper-connected society, the on-line marketing has been activated and is growing in size. Existing store marketing applications have disadvantages that customers have to find out events or promotional materials that the headquarters or stores throughusing the corresponding applications whenever they visit them. To solve these problems, there are attempts to create intelligent marketing tools using GPS technology and voice recognition technology. However, this approach has difficulties in technology development due to accuracy of location and speed of comparison and retrieval of voice recognition technology, and marketing services for customer relation are also much simplified.

Keywords

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Fig. 1. Classification by Frequency Band of Sound

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Fig. 2. Ultrasonic Signal Generation and Recovery System Configuration Diagram

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Fig. 3. General Ultrasonic Encoding Conceptual Plot

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Fig. 4. Packet Format (For 6 datacodes)

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Fig. 5. Android Ultrasonic Retrofit Schematic

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Fig. 6. Detection Failure Example

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Fig. 7. Sinkband Allocation Format

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Fig. 8. New Encoding Format

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Fig. 9. Effects of Ultrasonic Encoding

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Fig. 12. Example of Partial Loss Recovery

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Fig. 13. Chirp Signal Generation C Code

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Fig. 14. Sink Sound Generation C Code (M=4)

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Fig. 15. Data Generation C Code (M=4)

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Fig. 16. Spectrogram of Ultrasonic Waves Received through the Microphone

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Fig. 17. Ultrasonic Regeneration and Rehabilitation Device Implementation

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Fg. 10. Decodable Structure if Overlaps with other Signals in the Ultrasound Area

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Fig. 11. Recovered Ultrasonic Signal

Table. 1. Band Configuration

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Table. 2. Requirements for Generating and Restoring Ultrasonic Signals

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Table. 3. Results of Accuracy Measurement in the Cafe Environment

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Table. 4. Results of Experiments in the Environment of the Cafe

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