Frequency-Selective Impedance Circuits for Bidirectional Signal Transmission
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Solution Overview
Problem
Conventional automotive navigation systems are unable to transmit high frequency signals in one direction and low frequency signals in another direction simultaneously, limiting dual-directional data signal transmission of different bands.
Innovation Solution
A signal transmission system with multiple transmission devices and impedance circuits, each configured to manage current flow based on specific frequency bands, ensuring that current values do not exceed maximum output current values of the amplifiers, allowing for dual-directional transmission of signals with different frequency components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If high frequency signal and low frequency signal are synthesized and transmitted unidirectionally from information processing device to guide terminal, then signal transmission is achieved, but dual-directional transmission of different frequency bands is not possible
Solution Approach 1:
The transmission system is segmented into multiple transmission devices (information processing device and guide terminal), each equipped with independent output amplifiers and impedance circuits. This segmentation enables each device to independently transmit different frequency bands bidirectionally through the same transmission line, resolving the contradiction between versatility and complexity.
Solution Approach 2:
Each transmission device is equipped with a frequency-specific impedance circuit tailored to its operational requirements. The information processing device has an impedance circuit optimized for high frequency signals, while the guide terminal has an impedance circuit optimized for low frequency signals. This local quality differentiation enables bidirectional transmission of different frequency bands without interference.
2Adaptability or versatility
If multiple transmission devices share the same transmission line for bidirectional communication, then dual-directional transmission is enabled, but current may exceed maximum output current values causing signal distortion
Solution Approach 1:
The impedance circuits dynamically adjust their impedance values based on the frequency of the transmitted signals. By changing the impedance parameter according to frequency, the system controls current flow to remain within maximum output current values of the output amplifiers, preventing signal distortion while enabling bidirectional transmission.
Solution Approach 2:
The impedance circuits are configured to provide feedback control over current flow between transmission devices. When one device transmits a signal, the impedance circuit monitors and adjusts the impedance to prevent excessive current from flowing into the other device's output amplifier, ensuring reliable operation within current limits.
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
Enables efficient dual-directional transmission of signals with different frequency bands by controlling current flow through impedance circuits, preventing overcurrent and ensuring effective signal transmission across various frequency ranges.
Implementation Method 1
a first impedance circuit that has one or a plurality of reactance elements provided between the first output amplifier and a transmission line, where impedance of the first impedance circuit corresponds to frequencies belonging to a first band and is smaller than impedance corresponding to frequencies outside the first band
Implementation Method 2
a first impedance circuit that has one or a plurality of reactance elements provided between the first output amplifier and a transmission line
Data Source
AI summary
A signal transmission includes a first transmission device that includes: a first output amplifier that outputs a first output signal; and a first impedance circuit that has one or a plurality of reactance element provided between the first output amplifier and a transmission line, where impedance of the first impedance circuit corresponds to frequencies belonging to a first band, and is smaller than impedance corresponding to frequencies outside the first band; and a second transmission device that includes: a second output amplifier that outputs a second output signal; and a second impedance circuit that has one or a plurality of reactance elements provided between the second output amplifier and the transmission line, where impedance of the second impedance circuit corresponds to frequencies belonging to a second band differing from the first band, and is smaller than impedance corresponding to frequencies outside the second band.