Adaptive TV Input Filtering for Mobile Spectrum Interference
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Solution Overview
Problem
TV receivers face interference issues due to the coexistence of terrestrial television broadcasting and neighboring mobile radio transmission spectrums, particularly in frequency sub-bands allocated for additional radio services, leading to reception problems and the need for adaptive filtering to minimize interference.
Innovation Solution
A TV reception part with a control device and input filter means that dynamically adjusts its filtering state based on the current reception situation, using analysis routines to detect transmission spectra and control the input filter to either pass or block interference, ensuring optimal reception of TV services while minimizing interference from other radio services.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the input filter means permanently block the frequency sub-band to suppress interference from mobile radio services, then interference suppression is improved, but TV services in the same frequency sub-band cannot be received
Solution Approach 1:
The patent applies dynamics by making the filter state changeable between blocked and unblocked states based on reception conditions. The control device dynamically adjusts the input filter means to block the frequency sub-band when mobile radio interference is detected, and unblock it when TV services need to be received, resolving the contradiction between interference suppression and service reception capability
Solution Approach 2:
The patent changes the parameter of filter state (blocked/unblocked) based on detected reception situations. The control device monitors transmission spectra and adjusts the filter configuration parameter to appropriate states, enabling the system to adapt between suppressing mobile radio interference and receiving TV services in the same frequency sub-band
2Reliability
If the input filter means are set to pass all frequencies to maintain high sensitivity, then reception sensitivity is improved, but interference from mobile radio transmission spectrums increases
Solution Approach 1:
The system dynamically adjusts the filter state between pass and block configurations based on real-time detection of transmission spectra. When mobile radio interference is present, the filter blocks the frequency sub-band while maintaining sensitivity for other frequencies. When no interference is detected, the filter passes all frequencies to maintain high reception sensitivity
Solution Approach 2:
The input filter means applies selective filtering only to the specific frequency sub-band used by mobile radio services (790-862 MHz or 694-790 MHz), while leaving other frequency ranges unaffected. This local quality approach maintains high sensitivity for TV service frequencies while suppressing interference in the mobile radio frequency range
3Productivity
If the TV band V is fully utilized for digital TV services to maximize channel capacity, then productivity is improved, but coexistence with mobile radio services becomes difficult
Solution Approach 1:
The control device dynamically manages the coexistence by monitoring transmission spectra and adjusting the filter state accordingly. This enables the system to maintain full utilization of TV band V for digital TV services while dynamically suppressing mobile radio interference when both services operate in the same frequency sub-band, ensuring reliable coexistence
Solution Approach 2:
The system uses feedback from the detection of transmission spectra to control the filter state. The control device continuously monitors the frequency sub-band and adjusts the input filter means based on detected signals, enabling automatic adaptation to maintain both high channel capacity and reliable coexistence with mobile radio services
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 solution effectively protects TV reception from interference by adaptively controlling the input filter, ensuring high sensitivity and robustness to interference from mobile devices and other radio services, thereby maintaining reliable TV service reception across varying reception conditions.
Implementation Method 1
input filter means for frequency-selectively suppressing transmission power from transmission spectra in a frequency sub-band to an input circuit of a tuning unit
Data Source
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AI summary
The patent application relates to a TV receiver with a controllable input filter (FI) for suppressing interference power in an input circuit (IHF) of an RF tuning unit (TUN) caused by transmission spectra of terrestrially received radio services. It solves a problem arising from the gradual introduction of additional radio service types beyond the existing terrestrial television broadcasting or cable television use in at least one frequency subband (e.g., from 791 MHz to 821 MHz). According to the application, the input filters (FI) in the TV receiver must be adaptable to the changing reception conditions in a region. The TV receiver includes a control unit (CTRL) and the input filter (FI) for frequency-selectively suppressing transmission power from transmission spectra in a frequency subband.The TV receiver uses analysis routines with the following features: The control unit uses the tuning unit (TUN) to perform channel scans in the corresponding frequency subband to locate transmission spectra. Service type detection determines the current reception situation in the reception area within the frequency subband based on a transmission standard used for selected transmission spectra. Depending on the current reception situation, the control unit adjusts the input filter to either a pass state or a frequency-selective block state.