Audio Data Transmission Equalization for Frequency Interference
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Solution Overview
Problem
Existing data transmission methods between computing devices require specialized hardware and communicative pairing, and audio transmissions are susceptible to frequency-dependent interference that affects data accuracy.
Innovation Solution
Audio transmissions are structured with predetermined frequencies at known times, allowing receiving devices to identify frequency distributions, equalize magnitudes, and adjust timing to correct interference, enabling accurate data extraction without specialized hardware or pairing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If data is transmitted using audio transmissions between computing devices, then specialized hardware and communicative pairing are eliminated, but frequency-dependent interference reduces data accuracy
Solution Approach 1:
The patent applies preliminary action by inserting a training sequence with known predetermined frequencies at the beginning of the audio transmission. This allows the receiving device to pre-calculate frequency responses and equalization parameters before the actual data is transmitted, compensating for frequency-dependent interference in advance.
Solution Approach 2:
The patent uses feedback by having the receiving device calculate the actual frequency response of the audio channel based on the received training sequence, then use this information to adjust equalization parameters and compensate for interference in subsequent data reception.
2Adaptability or versatility
If audio transmissions are used for data transfer, then connectivity requirements are reduced, but interference from the audio channel affects transmission reliability
Solution Approach 1:
The receiving device measures the actual frequency response of the audio channel using the training sequence and feeds this information back into the equalization process, allowing the system to adapt to channel characteristics and maintain reliable transmission despite audio channel interference.
Solution Approach 2:
The patent changes parameters by adjusting equalization filters based on the measured frequency response. The system modifies the gain and phase parameters of different frequency components to compensate for distortion introduced by the audio transmission channel.
3Productivity
If predetermined frequencies are used for modulation, then data can be transmitted through audio channels, but frequency magnitude variations require complex equalization processing
Solution Approach 1:
The system performs preliminary equalization by calculating the frequency response using the training sequence before processing the actual data. This pre-computation of equalization parameters simplifies the processing required for the main data transmission.
Solution Approach 2:
The patent uses the training sequence as a copy or reference model of the expected signal. By comparing the received training sequence with the known transmitted frequencies, the system creates a model of the channel response that can be used to correct the actual data transmission.
Data Source
AI summary
Methods and systems are presented for correcting interference to audio transmissions containing data. In one embodiment, a method is presented that includes receiving an audio transmission that includes data modulated onto an audio carrier signal. A first portion of the audio transmission may be detected that includes predetermined frequencies that are produced at predetermined times. The method may further include determining a frequency distribution for the predetermined frequencies and identifying magnitudes of the predetermined frequencies within the frequency distribution. A second portion of the audio transmission may then be equalized according to the magnitudes of the predetermined frequencies.