GPS-Based FM Frequency Selection for Wireless Audio
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Solution Overview
Problem
Existing wireless communication devices face challenges in selecting available FM frequencies for RF output due to interference from existing broadcasters, especially in portable devices that move through different broadcast areas, leading to degraded signal quality.
Innovation Solution
A method and apparatus using a satellite positioning system (SPS) receiver to determine a geographic location and access a database to identify available FM channels, allowing for automatic selection and modulation of an RF frequency for wireless output, reducing user intervention and interference issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If fixed RF output frequencies are used, then device complexity is reduced, but signal quality degrades due to broadcaster interference
Solution Approach 1:
The patent implements dynamic RF frequency selection by using GPS location data to automatically determine and switch between different FM broadcast frequencies based on the device's geographic position. This transforms the static, fixed-frequency approach into a dynamic system that adapts to changing environmental conditions, resolving the contradiction between simple device configuration and reliable signal quality.
2Adaptability or versatility
If manual frequency selection is implemented, then adaptability to local conditions improves, but ease of operation deteriorates
Solution Approach 1:
The patent enables the device to automatically select and configure the appropriate RF output frequency based on its own GPS-determined location without requiring user intervention. The system serves itself by autonomously querying location databases and switching frequencies, thereby maintaining high adaptability to local broadcast conditions while preserving ease of operation.
3Adaptability or versatility
If portable device mobility is increased, then adaptability to different locations improves, but signal quality stability worsens due to entering broadcast areas
Solution Approach 1:
The patent implements a feedback mechanism where the device continuously monitors its GPS location and automatically adjusts the RF output frequency based on real-time geographic position data. This closed-loop system detects when the device enters a new broadcast area and responds by switching to an appropriate frequency, thereby maintaining signal quality consistency despite increased mobility and geographic adaptability.
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
This solution enables reliable and automatic selection of available FM frequencies, improving signal quality by minimizing interference from broadcasters and eliminating the need for manual frequency scanning, ensuring consistent audio output during navigation and travel.
Implementation Method 1
A SPS receiver, such as a GPS receiver, can determine its position based on conventional techniques
Implementation Method 2
The electronic equipment may provide wireless output by modulating the visual output onto a television carrier or modulating audio output onto a radio carrier, such as a Frequency Modulation (FM) radio carrier
Data Source
AI summary
Methods and apparatus for determining an available FM frequency channel for interfacing with FM modulated output signals from a wireless device are described herein. A SPS receiver, such as a GPS receiver, can determine its position based on conventional techniques. The SPS receiver can determine one or more available FM channels over which audio output may be transmitted. The SPS receiver can use the determined position to access a local data base of available channels. Alternatively, the SPS receiver can use the determined position to access a local database of allocated channels in order to determine one or more available channels. The SPS receiver may display a prompt or message that indicates an FM channel over which output audio is modulated.