Feedback Compressor Power Limiter for Burst Audio Waveforms
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Solution Overview
Problem
Power limiter circuits fail to accurately manage burst power waveforms, leading to attenuation of signals even when the average power is within limits, due to immediate application of attenuation based on peak power exceedance, which results in distortion or failure to pass unattenuated burst waveforms.
Innovation Solution
A feedback compressor circuit configuration that combines an auxiliary attenuation signal with a compressed attenuation signal from a feedback compressor circuit, using a low-pass filter to smooth power measurements and delay attenuation, allowing burst power waveforms to pass by not immediately charging to the limiter threshold during short bursts, and dynamically adjusting the threshold and filter state to manage auxiliary attenuation changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If immediate attenuation is applied when peak power exceeds threshold, then power limits are enforced, but burst power waveforms are distorted or fail to pass unattenuated
Solution Approach 1:
The low-pass filter is applied preliminarily to the power measurement signal before it is used to control attenuation. This preprocessing action smooths the power measurements and delays the attenuation response, allowing burst waveforms to pass through without immediate attenuation while still enforcing power limits over time.
Solution Approach 2:
The system provides a cushioning effect by using the low-pass filter to prevent immediate, harsh attenuation responses. The filter acts as a buffer that smooths out rapid power fluctuations, cushioning the transition into and out of attenuation states and preserving the natural dynamics of burst power waveforms.
2Manufacturing precision
If attenuation is delayed using low-pass filter, then burst waveforms pass unattenuated, but response time to power exceedance is reduced
Solution Approach 1:
The system dynamically adjusts the attenuation response based on the filtered power measurement. The low-pass filter creates a time-varying attenuation characteristic that responds differently to sustained power exceedance versus transient bursts, optimizing both signal fidelity and response time through dynamic adaptation.
3Measurement precision
If feedback compressor architecture is used to measure true output power, then accurate power measurement is achieved, but system complexity increases
Solution Approach 1:
The feedback compressor architecture uses feedback from the output stage to measure true output power by monitoring both voltage and current. This feedback mechanism allows accurate power measurement that accounts for varying load impedance, achieving precise power measurement despite the increased circuit complexity.
Data Source
AI summary
Example embodiments provide a process that includes one or more of receiving an audio signal at a feedback compressor circuit, determining how much to attenuate the audio signal when a power level of the audio signal exceeds a threshold power level, combining the audio signal with an auxiliary attenuation signal from an auxiliary attenuation source and a compressed attenuation signal from the feedback compressor circuit to create a combination signal, and generating an audio output signal of the feedback compressor circuit based on the combination signal.