Noise Removal Apparatus Using Frequency Band Inversion
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Solution Overview
Problem
Conventional radio communication apparatuses require multiple antennas and complex configurations to accurately remove internal noise, making it impractical to locate and eliminate noise sources, especially when multiple noise sources are present.
Innovation Solution
A noise removal apparatus that separates signals into communication and noise components using a band separation section, inverts the noise signal's frequency band, and adds it to the communication signal to cancel out noise, allowing for effective noise removal without additional antennas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple antennas are used to receive noise signals separately, then noise removal accuracy is improved, but device complexity increases
Solution Approach 1:
The patent segments the frequency spectrum into multiple bands using band separation sections. Each band can be processed independently to remove noise, allowing targeted noise removal in specific frequency ranges while maintaining overall system simplicity with a single antenna.
Solution Approach 2:
The patent changes frequency band parameters by separating the received signal into different frequency bands. This allows the system to identify and remove noise in specific frequency ranges without requiring multiple physical antennas, thus maintaining noise removal accuracy while reducing device complexity.
2Reliability
If band separation and frequency inversion are used to remove noise, then noise removal effectiveness is improved, but signal processing complexity increases
Solution Approach 1:
The patent applies periodic frequency inversion to the separated noise bands. By inverting the frequency bands of noise signals and adding them to the original signal, the system effectively cancels periodic noise components while maintaining manageable processing complexity through systematic repetition of the inversion and addition process.
Solution Approach 2:
The patent converts the harmful noise signals into beneficial cancellation components by inverting their frequency bands. The inverted noise bands are then added to the original signal, causing the noise components to cancel each other out while the desired communication signal remains intact, thus transforming harm into benefit.
3Measurement precision
If noise signals are received and processed separately, then noise cancellation accuracy is improved, but processing time increases
Solution Approach 1:
The patent performs preliminary band separation of the received signal into frequency bands before noise removal processing. By pre-separating the signal bands and identifying noise components in advance, the system can efficiently process and remove noise from each band simultaneously, reducing overall processing time while maintaining high cancellation accuracy.
Solution Approach 2:
The patent applies frequency inversion and noise cancellation processing to all frequency bands, not just those containing noise. This excessive action ensures that noise in any band is caught and removed, maintaining high cancellation accuracy while the parallel processing of multiple bands reduces the total processing time compared to sequential analysis.
Data Source
AI summary
An object of the present invention is to provide a noise removal apparatus, of a simplified configuration, capable of removing a noise. A band separation section 351 separates an inputted digital signal into a digital signal D1 and a digital signal D2 by using, as a boundary, the center frequency of a frequency band of the inputted digital signal. The phase adjustment section 352 adjusts a level and a frequency band of the digital signal D2, and outputs, as a removal signal R, a signal for which the level and the frequency band have been adjusted. The adder 353 adds the removal signal R to the digital signal D1, thereby enabling a signal obtained by removing an in-vehicle noise from the digital signal D1 to be outputted as a corrected signal A.