Bidirectional Signal Interface With Adaptive Filter Cutoff Control
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Solution Overview
Problem
Conventional bidirectional communication systems using the frequency division method struggle to flexibly set data rates and parameters for high-data-rate video signals and low-data-rate touch panel operation signals, particularly in systems with limited peripheral device functionality, leading to issues with weight, cost, latency, EMI, and power consumption.
Innovation Solution
A signal transmitting and receiving device with a filter and controller that adjusts the cutoff frequency, data rate, and slew rate of the second signal based on the recovered clock signal from the first signal, allowing flexible setting of data rates and parameters without additional transmission paths or connectors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of stationary object
If the frequency division method is used to transmit both first signal and second signal through a common transmission path, then weight and cost are reduced, but flexible setting of data rates and parameters becomes difficult
Solution Approach 1:
The patent applies dynamics by making the cutoff frequency of the filter adjustable rather than fixed. The controller dynamically changes the cutoff frequency based on the data rate of the first signal, enabling the system to adapt to different communication scenarios while using a common transmission path, thus resolving the contradiction between weight reduction and parameter flexibility.
Solution Approach 2:
The patent changes the parameter of cutoff frequency dynamically according to the first signal's data rate. By adjusting this parameter, the system can optimize performance for different signal conditions without requiring separate transmission paths, thereby maintaining low weight while achieving flexible parameter setting.
2Productivity
If the cutoff frequency of the filter is lowered to pass low-frequency second signal, then the second signal can be transmitted, but high-frequency first signal may be attenuated
Solution Approach 1:
The system dynamically adjusts the cutoff frequency based on the data rate of the first signal. When the first signal has low data rate, the cutoff frequency is lowered to allow second signal transmission. When the first signal has high data rate, the cutoff frequency is raised to prevent attenuation, thus dynamically resolving the conflict between transmitting the second signal and maintaining first signal quality.
Solution Approach 2:
The controller preliminarily determines the appropriate cutoff frequency based on the detected data rate of the first signal before transmitting the second signal. This preliminary adjustment ensures that the filter is optimally configured to prevent signal quality degradation while enabling the desired transmission.
3Reliability
If echo cancellation is performed using digital signal processor, then complete cancellation of second signal is achieved, but circuit area and power consumption increase
Solution Approach 1:
The patent extracts and removes the need for complex digital signal processors and high-speed buffers by using an analog filter-based approach. The filter selectively passes or attenuates signals based on frequency, eliminating the need for power-consuming digital cancellation circuits while achieving sufficient signal separation.
Solution Approach 2:
The patent replaces the digital signal processing mechanism (DSP, ADC, high-speed buffers) with an analog filter mechanism. This substitution uses passive electronic components and analog filtering to achieve signal cancellation and separation, significantly reducing power consumption and circuit complexity while maintaining effective cancellation characteristics.
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 flexible and efficient setting of data rates and parameters for both signals, reducing weight, cost, latency, EMI, and power consumption, while maintaining optimal communication performance.
Implementation Method 1
a frequency division method in which a common transmission path is provided to transmit the first signal and the second signal, frequency bands of the first and second signals differ
Implementation Method 2
a receiver to receive the first signal output through the filter, recover data and a clock signal based on the first signal
Implementation Method 3
In the differential signaling method, two signals of the differential signal are inverted each other, and the relevant currents flowing through the two transmission lines satisfy an inverted relationship, which cancels out magnetic fields generated by the currents
Data Source
AI summary
A bidirectional communication system includes a signal transmitting and receiving device and a signal transmitting and receiving device that perform bidirectional communication via a transmission path. The signal transmitting and receiving device includes a driver, a filter, a receiver, and a controller. The receiver recovers a clock signal by performing frequency locking on a training pattern signal output through the filter, and outputs a recovered clock to the controller. The controller receives the recovered clock output from the receiver, controls a cutoff frequency of the filter, and controls an operation of the driver based on a frequency information of the recovered clock signal.