Broadcast Receiver Digital Signal Multiplexing Single Cable
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing broadcast receiver systems face challenges with high costs and space requirements due to the use of multiple signal cables for broadcast signals with overlapping frequency bands, and polarization division multiplexing complicates system design while making signals susceptible to external interference.
Innovation Solution
A broadcast receiver system that uses a single signal cable to distribute broadcast signals with different polarizations by converting analog signals into digital signals and multiplexing them, eliminating the need for frequency conversion and reducing interference susceptibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple signal cables are used for broadcast signals with overlapping frequency bands, then signal distribution is achieved, but cost and space requirements increase
Solution Approach 1:
The patent combines multiple broadcast signals with different polarizations into a single signal cable by converting them to digital format and multiplexing. The digital signal processing unit receives multiple analog signals, converts them to digital, and outputs them through a single cable, eliminating the need for separate cables for each signal.
Solution Approach 2:
The patent changes the parameter domain from analog to digital signals. By converting analog broadcast signals to digital format, the system enables efficient multiplexing and transmission over a single cable, reducing both cost and space requirements while maintaining signal integrity.
2Productivity
If polarization division multiplexing is used, then frequency band utilization is improved, but system design complexity increases due to image signals and interference
Solution Approach 1:
The patent replaces complex analog signal processing mechanisms with digital signal processing. Instead of using mechanical or analog methods to handle polarization division multiplexing, image signal separation, and interference rejection, the system uses digital conversion and processing, which simplifies the overall design while maintaining high frequency band utilization.
3Quantity of substance
If frequency division multiplexing is applied to broadcast signals, then single cable distribution is achieved, but signals become susceptible to external interference
Solution Approach 1:
The patent uses digital signal processing which is more robust against interference. Digital signals can be regenerated and error-corrected, making them less susceptible to external interference compared to analog frequency division multiplexed signals. The system converts analog signals to digital format, processes them through digital signal processing units, and transmits them over a single cable with improved interference resistance.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A broadcast receiver comprising: a first acquisition component (233, 234) configured to acquire first and second digital signals (1, 2) generated based on a broadcast signal received by a receiving antenna; a first converter (161) configured to convert the first digital signal (1) into a first analog signal; a second converter (162) configured to convert the second digital signal (2) into a second analog signal; and a tuner (230) configured to select at least one broadcast signal based on at least one of the first and second analog signals converted by the first and second converters. The first analog signal is a broadcast signal with a specific wave polarization. The second analog signal is a broadcast signal whose wave polarization is different from the specific wave polarization.