Adaptive HD Radio Sensitivity Threshold for Nighttime Signal Stability
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Solution Overview
Problem
Prior HD radio receivers exhibit excessive transitions between digital and analog signal processing at night due to variable AM band radio signal strength, leading to choppy audio delivery, as they use a common sensitivity threshold for both daytime and nighttime operations.
Innovation Solution
Implementing a dynamic HD signal sensitivity threshold selection based on nighttime or daytime operation and AM radio signal strength, allowing for reduced unwanted transitions between digital and analog signal processing, with higher sensitivity for stronger stations and lower sensitivity for weaker signals to minimize disruptions from grounded conductive structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a common HD signal sensitivity threshold value is used for both daytime and night-time operation, then the device complexity is reduced, but the reliability of audio content delivery deteriorates due to excessive transitions between digital and analog signal processing at night
Solution Approach 1:
The patent implements dynamic adjustment of the HD signal sensitivity threshold based on time of day (daytime vs. night-time). The threshold value changes automatically according to operational conditions, allowing the system to adapt to varying AM band signal strength characteristics without requiring complex manual configuration or multiple fixed threshold schemes.
Solution Approach 2:
The patent changes the sensitivity threshold parameter values based on operational mode. Specifically, it uses a first sensitivity threshold value during daytime and a second, different sensitivity threshold value during night-time. This parameter adaptation resolves the contradiction by optimizing performance for each operational context while maintaining a relatively simple overall system architecture.
2Measurement precision
If the HD signal sensitivity threshold is set for maximum sensitivity during daytime, then the digital radio signal reception is maximized, but the stability of signal processing deteriorates at night-time due to variable AM band signal strength
Solution Approach 1:
The system dynamically switches between different sensitivity threshold values based on the time of day. During daytime, a more sensitive threshold is used to maximize digital signal reception. During night-time, the threshold is adjusted to a less sensitive setting to prevent excessive transitions caused by natural variations in AM band signal strength, thereby maintaining processing stability.
Solution Approach 2:
The patent implements parameter adaptation by using different sensitivity threshold values for different operational conditions. The first threshold value optimizes daytime performance with maximum sensitivity, while the second threshold value optimizes night-time performance by reducing sensitivity to accommodate variable signal conditions, thus maintaining stability.
3Adaptability or versatility
If the HD radio receiver transitions frequently between digital and analog signal processing at night, then it adapts to varying signal conditions, but the audio content delivery quality deteriorates due to choppy transitions
Solution Approach 1:
The patent implements dynamic threshold adjustment that adapts to night-time conditions by using a less sensitive threshold value. This reduces the frequency of transitions between digital and analog processing modes while still maintaining adequate adaptation to signal conditions, thereby preventing choppy audio delivery.
Solution Approach 2:
The system changes the sensitivity threshold parameter to a second value during night-time operation. This parameter change reduces the likelihood of spurious transitions caused by normal signal variations, maintaining audio delivery quality while still allowing necessary adaptations to genuine signal condition changes.
Data Source
AI summary
A vehicle has a lighting control module and a HD radio receiver. The lighting control module provides an indication of daytime operation of the vehicle and an indication of night-time operation of the vehicle. The HD radio receiver is configured for selecting between outputting digital format audio content of a radio signal and outputting analog format audio content of the HD radio signal dependent upon a HD signal sensitivity threshold. The HD radio receiver sets the HD signal sensitivity threshold to one of a plurality of different night-time HD signal sensitivity threshold values as a function of a signal strength characteristic of the HD radio signal when the lighting control module provides the indication of night-time operation thereto. The HD radio receiver sets the HD signal sensitivity threshold to a daytime HD signal sensitivity threshold value when the lighting control module provides the indication of daytime operation thereto.