Signal Processing Device for Vehicle Broadcast Noise Removal
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Solution Overview
Problem
Existing techniques fail to effectively remove noise with a periodic spectrum pattern in the frequency domain from signals received by antennas in vehicles, leading to interference with broadcast electromagnetic waves.
Innovation Solution
A signal processing device and method that convert time domain signals to frequency domain signals, calculate the frequency interval between noise peaks, determine a frequency shift amount, and shift the frequency to create a frequency-shifted signal, allowing for the extraction and removal of noise from the signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If noise removal technique from Patent Literature 1 is applied, then periodic noise in frequency domain can be removed, but noise with periodic spectrum pattern cannot be appropriately removed
Solution Approach 1:
The patent changes the frequency parameter of the signal by applying frequency shifting. The frequency shift amount is determined based on the frequency interval of noise peaks, which allows the broadcast signal to be moved to a different frequency position where noise interference is reduced or eliminated
Solution Approach 2:
The patent introduces frequency shifting as an intermediary process between signal reception and noise removal. By shifting the frequency of the broadcast signal before processing, it creates a new frequency domain representation where noise can be more effectively separated and removed
2Object-affected harmful factors
If frequency shifting is applied to remove noise, then noise with periodic spectrum pattern can be removed, but frequency range may overlap with tuned broadcast station
Solution Approach 1:
The patent dynamically adjusts the frequency shift amount based on the detected noise peak intervals and the frequency range of tuned broadcast stations. This dynamic adaptation ensures that the frequency-shifting operation removes noise while avoiding overlap with important broadcast frequencies
Solution Approach 2:
The patent modifies the frequency parameter adaptively by selecting a frequency shift amount that satisfies two conditions: it effectively shifts noise peaks away from the signal band, and it ensures the shifted signal does not overlap with tuned broadcast station frequency ranges
Data Source
AI summary
A signal processing device includes: a processor; and a memory having instructions. When executed by the processor, the instructions cause the signal processing device to perform operations including: converting a first signal that is a time domain signal into a second signal that is a frequency domain signal in response to reception of the first signal, the first signal containing noise superimposed on a broadcast electric signal derived from a broadcast electromagnetic wave, the noise having peaks of amplitude at regular frequency intervals in the frequency domain; calculating a frequency interval between the peaks of the noise in the frequency domain based on a correlation of the second signal; determining a frequency shift amount in the frequency domain based on the frequency interval; and shifting a frequency of the second signal by the frequency shift amount to create a frequency-shifted signal.