Phase Compensation Circuit for Multi-Scan Touch Sensing
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Solution Overview
Problem
Conventional phase compensation methods for multi-scan touch sensing systems either increase hardware costs or fail to effectively address phase shifts, leading to signal noise and processing difficulties.
Innovation Solution
A phase compensation method and circuit that automatically compensates carrier signals by performing demodulation, inverse matrix operations, and signal mixing on both in-phase and quadrature component signals, reducing hardware requirements and phase spread.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a hardware architecture with re-designed signal processing circuit is used to perform phase compensation on carrier signals one by one, then phase compensation can be achieved, but hardware cost and circuit complexity increase
Solution Approach 1:
The patent combines multiple carrier signal processing operations into a single integrated signal processing circuit. Instead of using separate hardware circuits for each carrier signal, the invention merges the processing of multiple carrier signals into one unified circuit that can handle all signals simultaneously, thereby reducing hardware cost and circuit complexity while maintaining phase compensation effectiveness.
Solution Approach 2:
The signal processing circuit is designed with multi-functionality to perform phase compensation on multiple different carrier signals using the same hardware resources. The circuit can dynamically adapt to process various carrier signals sequentially or concurrently, eliminating the need for dedicated hardware for each signal and reducing overall system complexity.
2Reliability
If conventional phase compensation methods are used, then some phase shift correction may be achieved, but phase spread of carrier signals cannot be solved and noises are induced
Solution Approach 1:
The patent implements a feedback mechanism where the signal processing circuit continuously monitors the phase characteristics of incoming carrier signals and dynamically adjusts compensation parameters. By detecting actual phase shifts and feed this information back to the compensation algorithm, the system can effectively correct phase spread and reduce induced noises adaptively, rather than using fixed conventional compensation methods.
Solution Approach 2:
The invention dynamically changes processing parameters such as demodulation frequencies and mixing coefficients based on the detected phase characteristics of each carrier signal. By adapting these parameters in real-time according to the specific phase conditions, the system can effectively compensate for phase spread and minimize noise induction across different signal conditions.
Data Source
AI summary
A phase compensation method for multi-scan in touch sensing system is provided. The phase compensation method includes the following steps. A plurality of carrier signals are received, and a demodulating operation is preformed on each of the carrier signals to obtain a first component signal and a second component signal of each of the carrier signals. An inverse matrix operation is respectively preformed on the first component signal and the second component signal both demodulated by the demodulating operation. A signal mixing operation is preformed on the first component signal and the second component signal both processed by the inverse matrix operation to obtain raw data of each of the carrier signals. Furthermore, a phase compensation circuit applying afore-said phase compensation method is also provided.