Emphasis Signal Circuit High-Frequency Extraction
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Solution Overview
Problem
Existing emphasis signal generating circuits face challenges in reducing frequency dependence and jitter while maintaining a low circuit scale and power consumption, as they often require increasing the number of taps to achieve effective pre-emphasis, which limits waveform shaping freedom and phase characteristics compensation.
Innovation Solution
The emphasis signal generating circuit incorporates a branch and delay unit, amplifiers, an addition and subtraction unit, and a coupling capacitor unit to extract and separate high-frequency components, allowing for phase compensation and minimizing the number of taps by performing emphasis on high-frequency components separately, thereby reducing circuit scale and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of taps is increased to reduce frequency dependence and jitter, then signal quality improves, but circuit scale and power consumption increase
Solution Approach 1:
The patent segments the signal processing into two independent paths: a main signal path and a high-frequency extraction path. The high-frequency extraction unit separately processes only the high-frequency components, while the main path handles the overall signal. This segmentation allows effective pre-emphasis with fewer taps by focusing computational resources on the problematic high-frequency components, thereby reducing circuit scale while maintaining signal quality.
Solution Approach 2:
The patent extracts high-frequency components from the main signal through a dedicated high-frequency extraction unit. By taking out and separately processing only the high-frequency portion that causes frequency dependence and jitter, the system achieves effective pre-emphasis without needing to process the entire signal spectrum through multiple taps, thus reducing circuit complexity while improving signal quality.
2Adaptability or versatility
If the number of taps is increased to achieve effective pre-emphasis, then waveform shaping freedom improves, but circuit scale increases
Solution Approach 1:
The patent divides waveform shaping into two independent functions: overall waveform control in the main path and high-frequency component shaping in the extraction path. This segmentation provides waveform shaping freedom by allowing independent optimization of different frequency components without requiring a large number of taps in a single complex filter structure.
Solution Approach 2:
The patent applies different processing qualities to different frequency components: the main path handles the overall signal characteristics while the high-frequency extraction path applies specialized processing tailored to high-frequency requirements. This local quality approach enables effective pre-emphasis with reduced circuit scale by optimizing each frequency range with appropriate processing rather than using a uniform complex filter.
3Reliability
If the number of taps is increased to compensate for phase characteristics, then signal degradation compensation improves, but power consumption increases
Solution Approach 1:
The patent extracts and separately processes high-frequency components that are most susceptible to phase degradation. By focusing phase compensation efforts on only the high-frequency portion rather than processing the entire signal spectrum through multiple taps, the system achieves effective phase characteristics compensation with reduced computational load and lower power consumption.
Solution Approach 2:
The patent applies partial action by focusing pre-emphasis and phase compensation primarily on the high-frequency components rather than uniformly processing all frequencies. This targeted approach achieves sufficient signal degradation compensation for the most problematic frequency range while minimizing unnecessary computational operations, thereby reducing power consumption while maintaining reliability.
Data Source
AI summary
An emphasis signal generating circuit includes: a branch and delay unit configured to branch an input signal, delay a branched signal, and output a first delayed signal; a high-frequency extraction unit configured to extract at least one of high-frequency components of the input signal and the first delayed signal to output a high-frequency signal; and an addition and subtraction unit configured to add and subtract the input signal, the first delayed signal, and the high-frequency signal.