Audio Signal Frequency Dynamics for Interference Reduction
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Solution Overview
Problem
Audio communication systems face interference issues due to reflected high-frequency signals, leading to decreased detection accuracy and transmission rates, as traditional methods like adding silence between signals extend data transfer time.
Innovation Solution
A communication system utilizing a receiving apparatus with a signal detector and processor that dynamically selects frequencies from a group of at least three frequencies to represent logic levels, allowing for interference differentiation and efficient data transfer without extending transmission time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a period of silence is added between two adjacent audio signals to attenuate reflected signal interference, then detection accuracy is improved, but data transmission rate is decreased
Solution Approach 1:
The patent applies dynamics by making the frequency of audio signals changeable over time. Specifically, adjacent audio signals use different frequencies dynamically selected from a frequency group, allowing the system to adapt to interference conditions without requiring silence periods, thus maintaining both detection accuracy and transmission rate
Solution Approach 2:
The patent changes the frequency parameter of audio signals to resolve the contradiction. By selecting frequencies dynamically from a frequency group based on detection results, the system can distinguish reflected signals from new signals without adding silence periods, thereby maintaining high data transmission rate while ensuring accurate detection
2Productivity
If high-frequency signals are used to transmit data, then data transmission capability is improved, but signal reflection interference increases
Solution Approach 1:
The system dynamically adjusts the frequency of audio signals used for data transmission. By selecting frequencies from a frequency group and changing them between adjacent signals, the system maintains data transmission capability while reducing the impact of reflected signal interference through frequency differentiation
Solution Approach 2:
The system uses feedback from the detection result to determine the frequency of the next audio signal. The detection unit detects whether the current audio signal is a reflected signal, and this detection result feeds back to the frequency selection for subsequent signals, allowing the system to adapt and mitigate interference while maintaining transmission capability
Data Source
AI summary
A communication system is provided. A receiver receives a plurality of audio signals, wherein a frequency of each of the audio signals is selected from a frequency group formed by at least three frequencies. A signal detector coupled to the receiver is configured to obtain the frequency of each of the audio signals. A processor coupled to the signal detector is configured to convert the frequency of each of the audio signals into a digital signal having a first logic level or a second logic level. Two adjacent audio signals of the audio signals have different frequencies, and at least one frequency of the frequency group is used to dynamically represent the first logic level or the second logic level.