Infrared Learning Device Signal Conditioning Circuit
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Solution Overview
Problem
Conventional universal remote controllers are limited in their ability to control electronic devices of unspecified brands since they require pre-stored IR signals, restricting their universal application.
Innovation Solution
An IR learning device that includes an IR transceiver, amplifying and shaping circuit, and processor to receive, amplify, shape, and sample IR signals, allowing it to learn and replicate the IR signals emitted by external devices, thereby enabling control of various electronic devices without prior signal storage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional universal remote controller stores IR signals in advance, then it can control specific brands of electronic devices, but it cannot control electronic devices of unspecified brands
Solution Approach 1:
The remote controller performs preliminary learning by receiving and storing IR signals from external devices before actual use. The learning circuit captures the carrier frequency, waveform, and timing characteristics of IR signals from target devices, enabling the remote to adapt to new devices without requiring pre-stored signals for every possible brand.
Solution Approach 2:
The system dynamically adjusts and learns IR signal parameters including carrier frequency, pulse width modulation patterns, and timing intervals. By measuring and storing these specific parameters from external devices during the learning phase, the remote controller can replicate signals tailored to each specific device brand and model, overcoming the limitation of fixed pre-stored signals.
2Measurement precision
If IR signal is directly processed without amplification and shaping, then the processing is simpler, but the digital signal quality is insufficient for accurate waveform and frequency calculation
Solution Approach 1:
An amplifying and shaping circuit serves as an intermediary between the IR transceiver and the learning circuit. This intermediate stage conditions the received IR signal by amplifying weak signals and shaping them into standardized digital waveforms, ensuring that the learning circuit receives high-quality signals suitable for accurate parameter extraction without requiring overly complex processing.
Solution Approach 2:
The signal processing function is divided into separate specialized stages: the amplifying and shaping circuit handles signal conditioning, while the learning circuit handles parameter measurement and storage. This segmentation allows each component to be optimized for its specific function, achieving high measurement precision without requiring the entire system to be overly complex.
3Adaptability or versatility
If the remote controller learns IR signals through hardware and software processing, then it can acquire signals from external devices, but the processing time and computational resources increase
Solution Approach 1:
The learning process is performed in advance during a dedicated learning phase before actual remote control operation. The hardware captures and stores signal parameters including carrier frequency, pulse widths, and timing intervals during this preliminary learning stage, so that during normal operation, the controller can quickly retrieve and replicate the learned signals without repeated complex processing.
Solution Approach 2:
Instead of continuously analyzing and processing IR signals during operation, the system creates a digital copy of the signal parameters during the learning phase. The learning circuit stores the essential characteristics (carrier frequency, waveform pattern, timing) as reference data, enabling fast signal generation during actual use without repeating the full measurement and analysis process.
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 the IR learning device to acquire and replicate IR signals from external devices, allowing it to control a wide range of electronic devices, effectively overcoming the limitations of conventional universal remote controllers.
Implementation Method 1
The IR transceiver is configured for receiving the IR signal
Implementation Method 2
The amplifying and shaping circuit is configured for amplifying and shaping the IR signal to generate a digital signal related to the IR signal
Data Source
AI summary
An infrared (IR) learning device is disclosed. A hardware device of the IR learning device amplifies, shapes, and samples an IR signal to acquire a better digital signal related to the IR signal. A software device of the IR learning device calculates the waveform of the IR signal and the frequency of a carrier wave of the IR signal according to the digital signal related to the IR signal. Accordingly, the IR learning device can learn the IR signal emitted from an external device by the hardware device and the software device.