Infrared Receiver Circuit External Clock Frequency Tuning
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Solution Overview
Problem
The manufacturing of infrared receiver circuits is time-intensive and costly due to the need for selecting and fine-tuning the center frequency of the bandpass filter, which requires an internal clock pulse generator.
Innovation Solution
The infrared receiver circuit utilizes an external clock pulse generator, such as a microcontroller, to set the center frequency of the bandpass filter, eliminating the need for an internal clock pulse generator and allowing for precise frequency setting without additional hardware or separate input lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If an internal clock pulse generator is used to set the center frequency of the bandpass filter, then the frequency can be precisely tuned, but the manufacturing process becomes time-intensive and costly
Solution Approach 1:
The clock pulse generator is extracted from the infrared receiver circuit and relocated to an external device. The frequency setting terminal of the bandpass filter is directly connected to the external clock pulse generator, eliminating the need for an internal clock pulse generator and its associated time-intensive selection and fine adjustment processes
Solution Approach 2:
The external clock pulse generator serves dual purposes: it provides the clock signal for frequency setting and can be integrated with the microcontroller or control unit already present in the receiving device, making the system more versatile and reducing overall component count
2Measurement precision
If an internal clock pulse generator is used for frequency setting, then precise frequency control is achieved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The clock pulse generator function is extracted from the infrared receiver circuit and assigned to an external source. This removes the internal clock pulse generator, frequency selection switches, and associated control circuitry, thereby reducing device complexity while maintaining frequency setting precision through the external generator
Solution Approach 2:
The clock pulse generator function is merged with existing external components such as the microcontroller or control unit that are already present in the receiving device. This consolidation eliminates redundant components and simplifies the overall system architecture
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
This approach reduces manufacturing costs and complexity by leveraging existing clock signals, ensuring high precision in frequency tuning and simplifying the production process while avoiding interference influences.
Implementation Method 1
a photodiode which receives the infrared signal transmitted by the remote control and converts it into electrical signals
Data Source
AI summary
The invention relates to an infrared receiver circuit for receiving a carrier-modulated infrared signal that comprises a carrier signal and a wanted signal modulated onto the carrier signal, having a band pass filter that exhibits a frequency adjustment connection via which the band center frequency of the band pass filter can be adjusted, furthermore having a demodulator for recovering the wanted signal and having a signal output to which the demodulated wanted signal can be output. The infrared receiver circuit exhibits a signal input that is at least indirectly connected to the frequency adjustment connection of the band pass filter so that the band center frequency of the band pass filter can be adjusted by a clock signal of an external clock pulse generator.