AM Noise Canceller with Adaptive Level Hold for Pulse Noise
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Solution Overview
Problem
Conventional noise cancellers fail to adapt the level hold period for pulse noise removal based on the fluctuations in the receiving signal's level, leading to either excessive distortion or inadequate noise removal, affecting sound quality.
Innovation Solution
A noise canceller system that includes a pulse noise detecting unit, a reception level detecting unit, and a level hold period setting unit, which dynamically adjusts the level hold period based on the receiving signal's level to effectively remove pulse noise while maintaining sound quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the level hold period T is fixed in conventional noise cancellers, then the device complexity is reduced, but the adaptability to varying signal conditions deteriorates
Solution Approach 1:
The level hold period T is changed from a fixed value to a dynamically adjustable parameter that varies according to the detected signal level. The level hold period setting unit receives the detected level information and adjusts T accordingly, making the noise canceller adaptive to different operating conditions while maintaining reasonable structural complexity.
Solution Approach 2:
The invention changes the parameter T (level hold period) based on the detected signal level. When the signal level is high, T is set to a shorter duration, and when the signal level is low, T is set to a longer duration. This parameter adaptation allows the system to maintain effectiveness across varying signal conditions without requiring a completely complex rearchitecture.
2Reliability
If the level hold period T is set too long, then pulse noise removal effectiveness is improved, but the distortion rate of the receiving signal worsens
Solution Approach 1:
The level hold period T is adjusted as a variable parameter based on the detected signal level. For high-level signals, T is shortened to prevent excessive distortion of the waveform. For low-level signals, T is extended to ensure complete pulse noise removal. This dynamic parameter adjustment resolves the contradiction between noise removal effectiveness and signal fidelity.
3Manufacturing precision
If the level hold period T is set too short, then signal distortion is reduced, but pulse noise removal effectiveness deteriorates
Solution Approach 1:
The system dynamically adjusts the level hold period T based on the detected signal level to ensure adequate noise removal. When low-level signals are detected, T is extended to a longer duration, guaranteeing that pulse noise is completely removed even though this increases the risk of distortion for other signal types. The level-based adjustment strategy prioritizes noise removal effectiveness in low-signal conditions.
4Ease of operation
If the level hold period T is fixed, then the ease of operation is improved, but the sound quality deteriorates under varying signal conditions
Solution Approach 1:
The noise canceller system performs self-adjustment by automatically detecting the signal level and autonomously setting the appropriate level hold period T. The level hold period setting unit uses the detected level information to configure T without requiring manual intervention, maintaining ease of operation while adapting to varying signal conditions to preserve sound quality.
Solution Approach 2:
The system automatically changes the level hold period T parameter based on detected signal characteristics. This self-adjusting mechanism eliminates the need for manual tuning while maintaining high sound quality across different operating conditions, effectively resolving the contradiction between operational simplicity and performance quality.
Data Source
AI summary
A noise canceller that a receiving signal received by a receiving antenna is input to, the noise canceller removing a pulse noise superimposed on the receiving signal to output the signal, the noise canceller comprising: a pulse noise detecting unit that detects the pulse noise superimposed on the receiving signal; a reception level detecting unit that detects the level of the receiving signal; a level hold unit that is triggered by the detection of the pulse noise with the pulse noise detecting unit to hold the level of the receiving signal in a process on the preceding stage of the output; and a level hold period setting unit that sets the level hold period when the level is held in the level hold unit in accordance with the level of the receiving signal detected by the reception level detecting unit.