Broadcast Receiver Switching Control Using Dynamic CN Estimation
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Solution Overview
Problem
Existing broadcast receivers experience repetitive switching between full-segment and one-segment broadcasts due to the same reference value being used for both stationary and moving states, leading to inconvenience and inefficiency in signal quality adaptation.
Innovation Solution
An electronic device with a receiver, first measuring module for carrier-to-noise power ratio (CN), and a control module that estimates CN in a stationary environment based on reception power, allowing adaptive switching between high-speed and low-speed transmission channels by comparing estimated and measured CN values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the same reference value is used for switching between full-segment and one-segment broadcasts irrespective of moving state, then the switching control is simple, but repetitive switching occurs and reliability deteriorates
Solution Approach 1:
The patent applies dynamics by making the reference value dynamic rather than static. The control module changes the reference value for switching between full-segment and one-segment broadcasts based on the detected moving state of the receiver. When the receiver is detected to be in motion, a different reference value is used compared to when it is stationary, allowing the switching control to adapt to changing environmental conditions and prevent repetitive switching.
Solution Approach 2:
The patent implements parameter changes by modifying the reference value parameter according to the moving state. The control module detects whether the receiver is in a moving or stationary state and accordingly adjusts the reference value used for comparing signal quality metrics. This parameter adaptation ensures reliable broadcast reception by preventing inappropriate switching that would occur with a fixed reference value.
2Adaptability or versatility
If automatic switching between full-segment and one-segment broadcasts is implemented, then adaptability to different transmission channels is improved, but repetitive switching occurs due to low error resistance of full-segment broadcast in moving states
Solution Approach 1:
The system maintains adaptability while improving reliability by dynamically adjusting the switching reference value based on the receiver's moving state. When motion is detected, the adjusted reference value prevents premature switching to full-segment broadcast, which has low error resistance and would cause repetitive switching. This dynamic approach allows the system to adapt to different transmission conditions while ensuring stable reception.
Solution Approach 2:
The patent employs feedback by continuously monitoring the receiver's state and using this information to adjust switching decisions. The control module detects the moving state and feeds this information back into the switching control logic, modifying the reference value accordingly. This feedback mechanism prevents repetitive switching by ensuring that transitions to full-segment broadcast only occur when signal conditions and receiver stability both warrant such switching.
3Reliability
If switching threshold is lowered to enable full-segment broadcast in moving state, then service quality improves, but error resistance decreases leading to reception failures
Solution Approach 1:
The patent applies parameter changes by adjusting the reference value based on the receiver's moving state rather than using a fixed threshold. When the receiver is detected to be in motion, the control module modifies the reference value to account for the degraded signal conditions and reduced error resistance of full-se段 broadcast. This dynamic parameter adjustment allows the system to optimize service quality while compensating for the increased error susceptibility in moving states.
Data Source
AI summary
According to one embodiment, an electronic device receives a broadcast signal includes a high-speed transmission channel and a low-speed transmission channel. The electronic device estimates a CN when the electronic device is in an environment corresponding to a stationary state, based on a measured reception power, reception sensitivity required for receiving a broadcast service of the high-speed transmission channel and a necessary CN required for receiving the broadcast service of the high-speed transmission channel, and controls a processing of switching a demodulation target between the high-speed transmission channel and the low-speed transmission channel, based on a difference between the estimated CN and the measured CN.