Broadcast Receiver RF Tuning Across Regional TV Bands
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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 components like high pass filters, impedance matching units, and signal amplifiers to efficiently suppress interfering signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If separate designs are used for each destination to adjust cutoff frequency, then interference suppression is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent implements a universal high frequency circuit design that can operate across multiple reception bands (VHF and UHF) without requiring separate designs for different destinations. The band limiter automatically adapts to the appropriate band based on the received signal, eliminating the need for destination-specific design variations while maintaining effective interference suppression.
Solution Approach 2:
The patent employs dynamic band limiting where the cutoff frequency of the band limiter is automatically adjusted based on the detected signal characteristics. This dynamic adaptation allows the same circuit design to effectively suppress interference in both VHF and UHF bands without requiring manual reconfiguration or separate designs for different reception bands.
2Reliability
If separate designs are used for each destination, then reception performance is improved, but ease of manufacture deteriorates
Solution Approach 1:
The patent creates a universal receiver design that maintains optimal reception performance across different regions and reception bands (VHF and UHF) without requiring separate manufacturing designs. The automatic band limitation feature ensures that the same manufactured unit achieves reliable reception performance regardless of the target reception band, significantly simplifying the manufacturing process.
3Device complexity
If fixed cutoff frequency is used, then device complexity is reduced, but adaptability to different regions deteriorates
Solution Approach 1:
The patent implements a dynamic band limitation mechanism where the cutoff frequency is automatically adjusted based on the detected signal characteristics without requiring complex circuit reconfiguration. This dynamic adaptation enables the same simple circuit design to effectively adapt to different regional reception bands (VHF and UHF) while maintaining low circuit complexity.
Solution Approach 2:
The high frequency circuit performs self-adjustment of the band limitation characteristics based on the detected signal. The detector monitors the received signal and automatically controls the band limiter to set the appropriate cutoff frequency, enabling the circuit to adapt to different regions without external intervention or complex control mechanisms.
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 efficient signal transmission and interference suppression across different regions without the need for design changes, effectively handling reception bands with varying center frequencies by automatically adjusting filter characteristics and impedance matching.
Implementation Method 1
a band limiter that performs band limiting in a predetermined band on a second output signal of the separator
Implementation Method 2
a detector that detects a signal output by the band limiter after band limiting
Implementation Method 3
the characteristic of the high frequency processor may also be at least a characteristic of the filter or a characteristic of the impedance matching unit
Data Source
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AI summary
A broadcast receiver (10) includes a processor (5) that processes a broadcasting signal, a detector (4) 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 (5) based on the detected level.