Wireless Receiver Dynamic Filter Bandwidth Adjustment
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Solution Overview
Problem
FM receivers face challenges in enhancing audio sensitivity while maintaining low current consumption and preserving other performance parameters, such as Total Harmonic Distortion and RDS sensitivity, without increasing the integrated circuit chip area or degrading battery life.
Innovation Solution
A wireless receiver system with a dynamically controllable filter module and electronic power management circuit that adjusts filter bandwidth based on signal conditions, using a down-converter module and digital processor to optimize audio sensitivity and power usage, including a process of dynamically decreasing channel select filter bandwidth to match varying signal bandwidth and power managing modules for improved audio sensitivity and reduced noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If filter bandwidth is decreased to reduce noise and enhance audio sensitivity, then audio sensitivity is improved, but signal distortion may increase and reception reliability degrades at lower RF SNR values
Solution Approach 1:
The patent implements dynamic filter bandwidth adjustment based on detected signal conditions. The receiver automatically adapts the filter bandwidth to match the instantaneous signal bandwidth, using narrower filters for weak signals to reduce noise while maintaining wider filters for strong signals to preserve signal integrity and avoid distortion.
Solution Approach 2:
The system changes the filter bandwidth parameter dynamically according to the received signal's characteristics. By monitoring signal strength and bandwidth, the receiver adjusts the filter parameters in real-time, optimizing the balance between noise reduction and signal preservation for different operating conditions.
2Measurement precision
If audio sensitivity is enhanced through hardware improvements, then audio sensitivity is improved, but integrated circuit chip area increases
Solution Approach 1:
The patent replaces hardware-based audio sensitivity enhancement with software-based digital signal processing. Instead of using larger analog filters or more complex RF front-end hardware, the system uses digital filtering and dynamic bandwidth adjustment algorithms to achieve the same or better performance with minimal additional chip area.
3Measurement precision
If audio sensitivity is improved through increased power consumption, then audio sensitivity is improved, but battery life decreases
Solution Approach 1:
The system uses intelligent power management that automatically adjusts receiver operation based on signal conditions. The dynamic filter bandwidth adjustment reduces processing requirements for weak signals, and the power management circuit adapts operating modes to minimize current consumption while maintaining acceptable audio sensitivity performance.
Data Source
AI summary
A wireless receiver includes a down converter module operable to deliver a signal having a signal bandwidth that changes over time, a dynamically controllable filter module having a filter bandwidth and fed by said down converter module, and a measurement module operable to at least approximately measure the signal bandwidth, said dynamically controllable filter module responsive to said measurement module to dynamically adjust the filter bandwidth to more nearly match the signal bandwidth as it changes over time, whereby output from said filter module is noise-reduced. Other wireless receivers, electronic circuits, and processes for their operation are disclosed.