Frequency-Selective Bit Width Control in Digital Filters
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Solution Overview
Problem
In digital filtering processes, increasing bit width to enhance precision leads to increased circuit scale and power consumption, while decreasing bit width to reduce these factors results in degraded filter performance, making it challenging to optimize partial circuits without compromising performance.
Innovation Solution
A digital filter device that includes a first transform circuit for processing data in a specific frequency range, a filtering circuit that sets the operation bit width of certain frequency components to a different value than others, and a second transform circuit to execute subsequent processes, allowing for optimized bit width adjustments based on frequency component importance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the bit width of signal data is increased to enhance operational precision, then the precision in operation is improved, but the circuit scale and power consumption increase
Solution Approach 1:
The patent applies different bit widths to different frequency components based on their importance. Specifically, frequency components within a predetermined range (e.g., near DC component) use a first bit width for high precision, while other frequency components use a second bit width (smaller than the first). This local differentiation allows the system to maintain high operational precision where needed while reducing circuit scale and power consumption in less critical areas.
2Measurement precision
If the bit width of signal data is increased to enhance operational precision, then the precision in operation is improved, but the power consumption increases
Solution Approach 1:
The patent reduces power consumption by applying smaller bit widths to frequency components that are less critical to filter performance. By limiting high-precision processing only to essential frequency ranges (such as those near the DC component), the system minimizes the energy required for bit-wise operations in less important frequency areas, thereby reducing overall power consumption while maintaining necessary precision.
3Device complexity
If the bit width of signal data is decreased to reduce circuit scale and power consumption, then the circuit scale and power consumption are reduced, but the precision in operation deteriorates
Solution Approach 1:
The patent strategically assigns larger bit widths only to frequency components where high precision is critical (e.g., predetermined frequency ranges around DC), and uses smaller bit widths for other frequency components. This selective approach ensures that operational precision is maintained where it matters most for filter performance, while allowing circuit scale reduction in less critical processing areas.
4Use of energy by stationary object
If the bit width of signal data is decreased to reduce power consumption, then the power consumption is reduced, but the precision in operation deteriorates
Solution Approach 1:
The patent optimizes the balance between power consumption and precision by using smaller bit widths for frequency components where high precision is not critical, thereby reducing power consumption. Simultaneously, it maintains larger bit widths for frequency components within predetermined ranges that are essential for filter performance, ensuring that precision deterioration is avoided in critical areas while achieving overall power savings.
Data Source
AI summary
In order to reduce a circuit scale and power consumption while maintaining filter performance, a digital filter device includes a first transform circuit for executing a first transform process on data in a predetermined frequency range; a filtering circuit for executing a filtering process by setting an operation bit width of data of a preset first frequency component among the data, on which the first transform process was executed by the first transform circuit, to a different bit width from bit widths of other frequency components; and a second transform circuit for executing a second transform process on the data on which the filtering process was executed by the filtering circuit.