Wireless Remote Control Using Doppler Shift Detection
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Solution Overview
Problem
Existing wireless remote control systems using ultrasonic signals require an additional infrared transmitter and receiver to determine the frequency of the emitted signal, increasing size, cost, and power consumption.
Innovation Solution
A wireless remote control system that calculates movement patterns based on frequency shifts induced by the Doppler effect, eliminating the need for an infrared emitter and receiver by using a decision module to determine the movement of a remote controller without knowing the exact frequency of the emitted signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an infrared emitter and receiver are added to determine the frequency of the ultrasonic signal, then the measurement precision of the frequency is improved, but the device complexity, size, and power consumption increase
Solution Approach 1:
The patent extracts and eliminates the infrared emitter and receiver components from the system. Instead of using infrared signals to determine ultrasonic frequency, the system directly processes ultrasonic signals through detectors and a microprocessor that calculates frequency differences using Doppler effect principles, thereby removing the unnecessary infrared subsystem while maintaining measurement capability
Solution Approach 2:
The patent introduces an intermediary approach where the microprocessor acts as a computational mediator. Rather than using infrared signals as a physical intermediary to carry frequency information, the system uses mathematical calculations on detected ultrasonic frequencies to determine the required frequency reference, eliminating the need for additional hardware intermediaries
2Measurement precision
If an infrared emitter and receiver are added to determine the frequency of the ultrasonic signal, then the measurement precision of the frequency is improved, but the size of the remote controller increases
Solution Approach 1:
The patent removes the infrared emitter and receiver components that would increase the remote controller's size. The system achieves frequency determination through computational methods using existing ultrasonic detectors and a microprocessor, eliminating the need for additional physical components in the remote controller
3Measurement precision
If an infrared emitter and receiver are added to determine the frequency of the ultrasonic signal, then the measurement precision of the frequency is improved, but the power consumption increases
Solution Approach 1:
The patent eliminates the infrared emitter and receiver subsystem that would consume additional power. The frequency measurement is achieved through computational processing of ultrasonic signals already being detected by the system, removing the energy-consuming infrared components while maintaining measurement precision
Solution Approach 2:
The system uses its existing ultrasonic detection capability to determine frequency information through computational analysis. The microprocessor leverages the detected ultrasonic signals and applies mathematical calculations based on Doppler effect principles, allowing the system to serve its own frequency measurement needs without requiring separate infrared measurement subsystems
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
The system achieves a compact, low-cost, and low-power remote control solution that can be widely used, with reduced size and power consumption, enabling efficient gesture-based control signals without the need for additional infrared components.
Implementation Method 1
Because of the Doppler effect, the frequencies detected by the two detectors (represented as f1 and f2) at the computer side are different from the original frequency of the ultrasonic signal emitted by the mouse (represented as f0)
Data Source
Figure 1~2(B)
Figure 3(A)
Figure 3(B)
AI summary
A wireless remote control system is provided. This system includes a remote controller, plural detectors, and a decision module. The detectors are used for detecting the frequency a wireless signal emitted by the remote controller and respectively generate a detecting result. Based on at least one frequency difference between the detecting results, the decision module determines how the remote controller is moving and thereby generates a control signal. Because the decision module needs no knowledge of the frequency of the emitted wireless signal, the wireless remote controller has the advantages of small size, low cost, and low power consumption.