Lattice Wave Filter Architecture for Multichannel Sample Rate Conversion
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Solution Overview
Problem
Conventional sample rate conversion systems in digital signal processing face challenges in reducing power consumption, silicon area, and latency, while maintaining efficient coefficient changes and noise cancellation in multichannel applications.
Innovation Solution
The implementation of multichannel, multirate lattice wave filters with a feedback path and multiplexer structure, which allows for efficient coefficient updates and reduced hardware complexity by combining multiple filter sections into a single reflector stage, enabling lower power consumption and silicon footprint.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional CIC, FIR, or IIR filters are used for sample rate conversion, then sample rate conversion can be performed, but power consumption is high
Solution Approach 1:
The patent combines multiple filter sections into a single lattice wave filter structure that processes multiple channels simultaneously. By merging the functionality of separate filters for different channels into one unified lattice structure, the patent reduces the total number of filter operations required, thereby lowering power consumption while maintaining sample rate conversion performance across all channels.
Solution Approach 2:
The lattice wave filter is designed to handle multiple signal channels and multiple sample rate conversions within a single processing structure. This multi-functional approach allows the same hardware to perform what would traditionally require multiple separate filter banks, reducing overall power consumption while maintaining conversion accuracy for all channels.
2Area of stationary object
If multiple filter sections are implemented separately for each channel, then channel processing is straightforward, but silicon area increases
Solution Approach 1:
The patent merges multiple channel processing paths into a single lattice wave filter structure that can simultaneously process multiple channels. This consolidation reduces the silicon area required by eliminating redundant filter sections for each channel, while the lattice structure's inherent ability to handle multiple input/output channels maintains full multichannel processing capability.
Solution Approach 2:
The single lattice wave filter structure is designed to be universal, handling multiple channels and multiple sample rate conversions simultaneously. This multi-functional design eliminates the need for separate dedicated filter sections for each channel, thereby reducing silicon footprint while preserving adaptability to process various channel configurations.
3Loss of time
If traditional filter structures are used, then coefficient changes can be implemented, but latency increases
Solution Approach 1:
The lattice wave filter structure segments the filtering operation into stages that can be pipelined efficiently. By dividing the processing into manageable segments with intermediate outputs, the patent reduces the overall critical path delay compared to traditional single-stage filter structures, thereby reducing latency while maintaining coefficient update capability.
4Device complexity
If separate hardware is implemented for each filter section, then processing is simple, but device complexity increases
Solution Approach 1:
The patent combines multiple filter sections into a single integrated lattice wave filter that processes multiple channels simultaneously. This merging reduces device complexity by eliminating redundant hardware components that would be required if separate filters were implemented for each channel, while the unified structure maintains high processing efficiency through shared computational resources.
Data Source
AI summary
Systems and methods for multichannel, multirate lattice wave filters receive digital signal channels at a first sample rate and include a first multiplexer to combine the digital signal channels into a first digital data stream, and a first lattice wave filter comprising a first delay elements and a first feedback path to the first multiplexer, the first lattice wave filter produces a first output digital data stream having a second sample rate that is different than the first sample rate. The first multiplexer is configured to receive a first feedback signal through the first feedback path and combine the first feedback signal with the digital signal channels to produce the first digital data stream. The system may include a first processing branch comprising the first multiplexer and the first lattice wave filter structure, and a second processing branch comprising a second multiplexer and a second lattice wave filter structure. This may enable the implementation of simplified filters of lower complexity by reuse of hardware.