Phase Shift Keyed Sonic Signal Encoding
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Solution Overview
Problem
Existing methods for embedding sonic signals in audio content face limitations in data transmission integrity and flexibility, particularly in efficiently transmitting large amounts of data and varying data volumes across different applications.
Innovation Solution
A device and method that encode data messages as symbol sequences using phase characteristics of audio carriers, generating and transmitting sonic signals, and decoding these signals using a processor circuit with a quadrature oscillator and low-pass filtering to identify phases and decode symbol sequences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional sonic signals are embedded in audio content using frequency modulation, then data can be transmitted through audio playback, but the data transmission integrity and flexibility are limited
Solution Approach 1:
The patent applies parameter changes by transitioning from frequency modulation to phase modulation for encoding sonic signals. Phase modulation provides more robust data transmission integrity while maintaining flexibility through phase state variations (e.g., 0, π/2, π, 3π/2 radians), allowing adaptation to different data volumes and applications without sacrificing reliability.
2Object-affected harmful factors
If sonic signals are transmitted at frequencies above 20,000 Hz or below 20 Hz, then the signals remain inaudible to humans, but the system lacks efficiency in transmitting large amounts of data
Solution Approach 1:
The patent employs periodic action by using phase-shift keyed signaling tones that are repeatedly and periodically output by the sound source. This periodic transmission of phase-encoded symbols enables efficient data transmission while maintaining inaudibility, as the phase transitions occur at audio frequencies that are imperceptible to humans when properly modulated.
3Measurement precision
If modulated codes are repeatedly output by the sound source, then the decoding device can identify and demodulate the code, but the system cannot efficiently handle varying data volumes for different applications
Solution Approach 1:
The patent applies dynamics by making the sonic signal transmission adaptive to different data volumes and application requirements. The phase modulation scheme allows dynamic adjustment of transmission parameters such as symbol rate and phase states, enabling the system to efficiently handle varying data volumes while maintaining decoding accuracy through the robust phase-based encoding scheme.
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
This approach enhances data transmission integrity and flexibility by allowing efficient encoding and decoding of data messages within audio content, enabling reliable delivery of data messages as audio content.
Implementation Method 1
Each symbol encodes a data value that is associated with respective phase characteristics of the audio carrier during the time period
Implementation Method 2
filter the complex modulated signal with a low pass filter to generate a complex baseband signal
Data Source
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AI summary
A disclosed device 2010, 2300 is configured to generate and transmit a sonic signal 2012 that encodes a symbol sequence, representing a data message, for delivery as audio content. The device includes an audio transmitter and a processor circuit. The processor circuit is configured to encode the data message as a sequence of symbols 2034, with each symbol 1802 encoding a data value thai is associated with respective phase characteristics of a transmitted audio carrier. The processor is further configured to generate 2102 audio samples of a digitized version of the sequence of symbols using the phase characteristics of the audio carrier associated with the symbols, and to control 2108 the audio transmitter to generate and transmit the sonic signal, based on the audio samples. A further disclosed device 2014 is configured to receive 2202 the sonic signal and to decode 2210 a symbol sequence by identifying symbols corresponding to determined phases of the sonic signal.