Broadcast Receiver Tuning Circuit for Regional Band Interference
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Solution Overview
Problem
Conventional high frequency circuits require separate designs for different regions due to varying digital television broadcast reception bands, necessitating adjustments in cutoff frequencies to suppress interfering signals effectively.
Innovation Solution
A high frequency circuit with a separator, processor, band limiter, detector, and adjuster that automatically adjusts characteristics or operations based on detected signals to accommodate different reception bands without design changes, using multiple band limiters and detectors to suppress interfering signals across multiple regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If separate designs are used for each destination to adjust cutoff frequency, then interfering signals are efficiently suppressed, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent applies dynamics by making the cutoff frequency adjustable rather than fixed. The high pass filter's cutoff frequency is dynamically changed based on the reception band (U.S. or Japan) through a frequency changing section that modifies the filter characteristic according to the detected broadcast signal standard, allowing the same device to adapt to different regional requirements without separate designs
Solution Approach 2:
The patent changes the parameter of cutoff frequency based on the reception band. By detecting whether the broadcast signal follows U.S. or Japan standards, the system automatically adjusts the cutoff frequency parameter of the high pass filter to match the appropriate reception band, eliminating the need for separate designs for each destination
2Reliability
If separate designs are used for each destination, then reception performance is optimized for specific regions, but adaptability to different regions decreases
Solution Approach 1:
The system dynamically adjusts its characteristics based on the detected reception band. The frequency changing section modifies the high pass filter's cutoff frequency in real-time according to whether the broadcast signal is from the U.S. or Japan, enabling the device to maintain optimal reception performance across different regions without requiring separate designs
Solution Approach 2:
The patent implements universality by designing a single high frequency circuit that can handle multiple reception bands (both U.S. and Japan standards). The automatic detection and frequency adjustment mechanism allows one device to perform the function of multiple region-specific devices, achieving both optimized reception and broad adaptability
3Object-affected harmful factors
If manual adjustment of cutoff frequency is performed, then interfering signals are suppressed, but ease of operation and automation decrease
Solution Approach 1:
The system performs self-service by automatically detecting the broadcast signal standard (U.S. or Japan) and autonomously adjusting the high pass filter's cutoff frequency without user intervention. The detection section identifies the reception band and triggers the frequency changing section to modify the filter characteristic automatically, eliminating the need for manual adjustment while maintaining effective interfering signal suppression
Solution Approach 2:
The patent implements feedback by using the detection section to monitor the broadcast signal characteristics and feed this information back to the frequency changing section. Based on the detected reception band, the system automatically adjusts the cutoff frequency, creating a closed-loop control system that simplifies operation while maintaining optimal performance
Data Source
AI summary
A broadcast receiver includes a processor that processes a broadcasting signal, a detector that detects a level of a signal of a first predetermined band of the broadcasting signal, and an adjuster that adjusts at least one of a characteristic and an operation of the processor based on the detected level.