Dual-Level Dynamic Range Control Circuit for Clipping Reduction

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Solution Overview

Problem

Current dynamic range controllers in loudspeaker systems face limitations, particularly with low-frequency reproduction, leading to numeric overflow and clipping issues due to the lack of effective dynamic range control algorithms that can address sudden signal attenuation and amplification.

Innovation Solution

A method and circuit for dynamic range control using peak level and RMS level double-level detection, which processes input signals through an equalizer, detects peak and RMS levels, adjusts parameter configurations, and applies dynamic gain adjustments to mitigate clipping distortion.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Volume of moving object

If bass enhancement and compensation is introduced by digital equalizers for low-frequency reproduction, then low-frequency reproduction capacity is improved, but numeric overflow leading to clipping occurs

Engineering Contradiction:

Improvelow-frequency reproduction capacityVSAvoidnumeric overflow and clipping

Core Design Contradiction:

Volume of moving objectVSObject-affected harmful factors

Solution Approach 1:

The patent applies preliminary action by performing dynamic range control before the equalized signal is output to the power amplifier. The system detects peak and RMS levels of the equalized signal and adjusts the dynamic gain in advance to prevent numeric overflow and clipping from occurring in the power amplifier stage, thereby resolving the contradiction between improved low-frequency reproduction and prevention of numeric overflow

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent implements feedback mechanisms by continuously monitoring both peak level and RMS level of the equalized signal. The dynamic range controller uses this feedback information to adjust the dynamic gain parameter, creating a closed-loop control system that prevents clipping while maintaining low-frequency enhancement benefits

Inventive Principle:

Principle #23Feedback

2Speed

If peak level dynamic range control is used, then response speed is improved, but signal suddenly attenuates and amplifies causing instability

Engineering Contradiction:

Improveresponse speedVSAvoidsignal amplitude stability

Core Design Contradiction:

SpeedVSStability of the object's composition

Solution Approach 1:

The patent merges peak level detection and RMS level detection into a dual-detection dynamic range control system. The peak level provides fast response for sudden signal changes, while the RMS level provides stable baseline control. By combining both detection methods and using their weighted sum to control dynamic gain, the system achieves both fast response speed and signal amplitude stability

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent changes the control parameter from single-level detection to dual-level detection (peak and RMS). The dynamic gain is controlled by a composite parameter that includes both peak level and RMS level components, allowing the system to transition smoothly between different signal conditions and avoid sudden attenuation or amplification

Inventive Principle:

Principle #35Parameter changes

3Stability of the object's composition

If RMS level dynamic range control is used, then signal stability is improved, but response speed decreases due to detection process requirements

Engineering Contradiction:

Improvesignal amplitude stabilityVSAvoidresponse speed

Core Design Contradiction:

Stability of the object's compositionVSSpeed

Solution Approach 1:

The patent combines peak level detection (fast response) and RMS level detection (stable control) into a unified dynamic range control system. The peak level component provides immediate response to sudden signal changes, while the RMS level component maintains stable baseline control, achieving both fast response speed and signal amplitude stability simultaneously

Inventive Principle:

Principle #5Merging (Combining)

4Object-affected harmful factors

If dynamic range control is applied after equalization, then clipping is reduced, but processing time increases

Engineering Contradiction:

Improveclipping distortionVSAvoidprocessing time

Core Design Contradiction:

Object-affected harmful factorsVSLoss of time

Solution Approach 1:

The patent applies dynamic range control as a preliminary processing step before the equalized signal reaches the power amplifier. By detecting and adjusting the dynamic gain of the equalized signal in advance, the system prevents clipping from occurring in subsequent stages, reducing the need for complex real-time correction processing and thereby minimizing processing time loss

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS12176873B2Method and circuit for dynamic range control based on peak level and RMS level double-level detection

Publication Date: 2024.12.24 SUZHOU ACME SEMI CO LTD

AI summary

The present application relates to a method and a circuit for dynamic range control based on peak level and RMS level double-level detection. The method includes: processing an input signal by an equalizer, to obtain an equalized signal; detecting a signal peak level and a signal RMS level of the equalized signal, to obtain the signal peak level and the signal RMS level; adjusting a parameter configuration of a dynamic range controller according to the signal peak level and the signal RMS level; adjusting a dynamic gain of the dynamic range controller according to the parameter configuration, and adjusting the equalized signal by using the adjusted gain, and then outputting the adjusted equalized signal. The method can not only control the dynamic range of the signal but also improve the clipping distortion of the signal.