Audio Signal Processing Device for Radiofrequency Multipath Interference
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Solution Overview
Problem
Existing audio signal processing technologies fail to account for the history and repetition of multipaths during radiofrequency signal transmission, leading to instabilities due to instantaneous processing methods.
Innovation Solution
A device comprising both an instantaneous multipath sensor and a mean multipath sensor, along with corresponding filter blocks, to analyze and attenuate audio signals based on instantaneous and mean multipath rates, respectively, to address both quick and long-term multipath interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If instantaneous processing operation is used to attenuate audio signal based on multipath magnitude, then the audio signal can be quickly attenuated in response to multipath interference, but harmful instabilities and pumping effects occur due to lack of consideration for multipath history and repetition
Solution Approach 1:
The processing device is divided into two independent processing paths: an instantaneous processing path that provides fast response to multipath interference, and a mean processing path that provides stable, history-aware attenuation. Each path has its own sensor and filter block operating independently with different time constants, allowing both speed and stability to coexist without mutual interference
Solution Approach 2:
The mean multipath sensor acts as an intermediary that processes the instantaneous multipath rate through temporal filtering with a larger time constant. This intermediary component smooths out rapid fluctuations and provides a stabilized control signal to the mean filter block, preventing direct transmission of unstable instantaneous variations to the audio signal
2Device complexity
If only instantaneous multipath sensing is used, then the processing operation is simple and fast, but it does not take into account the history and repetition of multipaths leading to pumping effects
Solution Approach 1:
The mean multipath sensor continuously analyzes the instantaneous multipath rate and maintains a running average through temporal filtering with a larger time constant. This continuous processing ensures that historical multipath information is always available and incorporated into the attenuation decision, providing reliable processing without requiring complex memory or storage mechanisms
Solution Approach 2:
The mean filter block performs preliminary attenuation based on the mean multipath rate before the instantaneous filter block applies its attenuation. This preliminary action establishes a stable baseline attenuation that accounts for multipath history, upon which the instantaneous filter can build for rapid response to current interference conditions
Data Source
AI summary
A device for processing an audio signal arising from a radiofrequency signal, including: an instantaneous multipath sensor able to analyze the radiofrequency signal so as to determine an instantaneous multipath rate, an instantaneous filter block able to attenuate the audio signal in line with an instantaneous attenuation that is an increasing function of the instantaneous multipath rate, also including a mean multipath sensor able to determine a mean multipath rate, and a mean filter block able to attenuate the audio signal in line with a mean attenuation that is an increasing function of the mean multipath rate. A radio receiver having such a processing device is also disclosed.