Digital Interference Equalizing Circuit Using Clipping and Dither
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Solution Overview
Problem
High-speed data transmission systems face signal corruption due to energy coupling, which introduces data-dependent interference, particularly affecting analog-to-digital and digital-to-analog converters, making it difficult to maintain consistent noise levels across operating conditions.
Innovation Solution
A digital interference equalizing circuit comprising a clipping unit and a dithering unit that clips the digital signal and adds dither to maintain constant interference levels, reducing data-dependent noise by ensuring the signal remains within the dynamic range, even at full or zero scale, thereby converting data-dependent noise into random noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If dithering is added to equalize digital interference, then data-dependent noise is reduced, but device complexity increases
Solution Approach 1:
The equalizing circuit is divided into two functional segments: a clipping unit that limits signal excursions and a dithering unit that adds randomization. This segmentation allows each unit to perform its specific function efficiently, reducing data-dependent noise while keeping the overall complexity manageable through modular design.
Solution Approach 2:
Dither signal acts as an intermediary element between the clipping unit and the output. By introducing this random dither signal, the circuit converts deterministic data-dependent noise into random noise, effectively equalizing interference across all operating conditions without requiring complex adaptive algorithms.
2Stability of the object's composition
If clipping is applied to prevent saturation, then dynamic range is maintained, but signal distortion increases
Solution Approach 1:
The clipping operation, which normally causes distortion by cutting off signal peaks, is combined with dithering to convert the harmful deterministic distortion into beneficial random noise. The clipping maintains dynamic range stability by preventing saturation, while the subsequent dithering randomizes any clipping artifacts, making them imperceptible and effectively turning a harmful effect into a beneficial one.
Solution Approach 2:
The circuit changes the statistical parameters of the noise signal by adding dither. This transforms the noise distribution from data-dependent deterministic patterns to a random distribution with controlled statistical properties, maintaining dynamic range while eliminating audible distortion patterns.
Data Source
AI summary
The invention is directed to a circuit and method for equalizing digital interference. A digital interference equalizing circuit may include a signal clipping unit, receiving a digital signal and clipping the digital signal based upon a clipping function, and a dithering unit adding dither to the clipped digital signal. A digital interference equalizing circuit may also include a noise detection circuit, detecting the normal activity level in a digital signal which may then be used to scale the dither added to the digital signal.