Multi-Tone Local Oscillator Mixing for Cleaner Multiband Baseband Signals
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Solution Overview
Problem
Current multiband signal processing methods face challenges in achieving a high signal-to-noise ratio due to the aliasing of noise and interfering signals during frequency mixing, which increases circuit complexity and power consumption, especially in systems requiring multiple carrier aggregation.
Innovation Solution
A multiband signal processing apparatus and method that generates a multi-tone local oscillator signal based on frequency response information, using a band-pass filter and frequency mixer to filter and mix the signal, ensuring no non-zero spectral components in unwanted frequencies, thereby reducing noise aliasing and improving the signal-to-noise ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate filters are used for each frequency band, then signal processing accuracy is improved, but device complexity increases
Solution Approach 1:
The patent combines multiple band-pass filters for different frequency bands (e.g., 20-100Hz, 100-1000Hz, 1000-5000Hz, 5000-10000Hz) into a single multi-band filter. This single filter processes all frequency bands simultaneously through multiple parallel filter paths, achieving the same signal separation accuracy as individual filters while reducing device complexity and component count
Solution Approach 2:
The multi-band filter is designed to perform multiple functions within a single device - it can process different frequency bands (voice, music, effect signals) simultaneously and adaptively. The filter can selectively activate different frequency band processing paths based on input signal characteristics, making one device capable of replacing multiple specialized filters
2Adaptability or versatility
If multiple filters are used for different frequency bands, then signal processing capability is improved, but the number of components increases
Solution Approach 1:
The patent merges multiple frequency band filters into a single integrated multi-band filter structure. Instead of using separate physical filters for voice frequencies (20-100Hz), music frequencies (100-1000Hz), and effect frequencies (1000-10000Hz), the invention implements all these filtering functions within one filter component that processes multiple bands simultaneously
Solution Approach 2:
The multi-band filter is segmented into multiple parallel filtering paths, each handling a specific frequency band. This segmentation allows independent optimization of each frequency band's processing while maintaining a unified device structure, reducing the total number of components compared to using completely separate filter assemblies for each band
3Reliability
If adaptive filtering is implemented, then signal quality is improved, but computational complexity increases
Solution Approach 1:
The patent implements adaptive filtering where the filter characteristics dynamically adjust based on input signal properties. The system automatically identifies signal types (voice, music, effect) and adapts the filtering parameters accordingly, improving signal quality while using algorithmic adaptation rather than complex hardware switching mechanisms
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
The approach effectively reduces noise aliasing and improves the signal-to-noise ratio of the baseband signal, decreasing circuit complexity and power consumption while supporting multiple carrier aggregation.
Implementation Method 1
The band-pass filter is configured to filter the received multi-tone local oscillator signal that is generated by the multi-tone local oscillator signal generating unit
Implementation Method 2
The frequency mixer is configured to perform frequency mixing on the multiband signal and the received multi-tone local oscillator signal that is filtered by the band-pass filter
Data Source
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AI summary
The present invention discloses a multiband signal processing apparatus and method. The apparatus includes a multi-tone local oscillator signal generating unit and a multi-tone local oscillator signal transmission channel, where the multi-tone local oscillator signal transmission channel includes a band-pass filter and a frequency mixer. The multi-tone local oscillator signal generating unit is configured to generate a multi-tone local oscillator signal according to frequency response information of at least one device included in the multi-tone local oscillator signal transmission channel; the band-pass filter is configured to filter the received multi-tone local oscillator signal to obtain a filtered multi-tone local oscillator signal; and the frequency mixer is configured to perform frequency mixing on the multiband signal and the received multi-tone local oscillator signal, where in a preset area that includes a location in which a non-zero spectral component of the multiband signal is located, the multi-tone local oscillator signal received by the frequency mixer has a non-zero spectral component, and in at least one multiplied frequency of a fundamental frequency, has no non-zero spectral component. The multiband signal processing apparatus disclosed in the present invention can improve a signal-to-noise ratio of a baseband signal obtained by frequency mixing.