Parametric Equalizer Weighting Control to Prevent Signal Clipping
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Solution Overview
Problem
Parametric equalizers face challenges in achieving optimal auditory effects and gain compensation, as they either cause signal clipping when input levels are high or fail to produce a good auditory effect when levels are low, and lose gain compensation at high input levels.
Innovation Solution
A method that dynamically adjusts weighting values instead of gain values in a parametric equalizer, using a combination of first and second parametric equalizer circuits, multiplication circuits, and an addition circuit, with a weighting control circuit to adjust these values based on the equalizer output signal, allowing for flexible gain adjustment between +12 dB and -6 dB.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the level of the signal inputted to the parametric equalizer is increased, then the auditory effect is improved, but signal clipping occurs and gain compensation is lost
Solution Approach 1:
The patent applies dynamics by making the weighting values adjustable and adaptable rather than fixed. The system dynamically adjusts the weighting between different parametric equalizer circuits based on input signal characteristics, allowing optimal performance across varying signal levels without clipping. This is achieved through control circuits that modify the weighting parameters in real-time according to the input conditions.
2Object-affected harmful factors
If the level of the signal inputted to the parametric equalizer is decreased, then signal clipping is avoided, but good auditory effect cannot be achieved
Solution Approach 1:
The patent employs parameter changes by adjusting the weighting values as control parameters to optimize the output across different input levels. By changing the weighting parameters dynamically, the system maintains good auditory effects even at lower input levels where clipping would normally occur. The parameter adjustment compensates for the reduced input level to preserve audio quality.
3Power
If gain values are adjusted in traditional parametric equalizers, then frequency response is modified, but gain compensation is lost at high input levels
Solution Approach 1:
The patent introduces weighting values as intermediary control parameters between the input signal and the parametric equalizer circuits. Instead of directly adjusting gain values that lead to compensation loss, the weighting values act as mediators that optimize the signal processing path. This intermediary mechanism preserves gain compensation by controlling the contribution of different circuit paths rather than directly amplifying signals to clipping levels.
Data Source
AI summary
A parametric equalizer includes a first parametric equalizer circuit, a second parametric equalizer circuit, a first multiplication circuit, a second multiplication circuit, an addition circuit, and a weighting control circuit. The first parametric equalizer circuit processes an input signal to output a first output signal. The second parametric equalizer circuit processes the input signal to output a second output signal. The first multiplication circuit multiplies the first output signal and a first weighting value to generate a first adjusted output signal. The second multiplication circuit multiplies the second output signal and a second weighting value to generate a second adjusted output signal. The addition circuit combines the first adjusted output signal and the second adjusted output signal to generate an equalizer output signal. The weighting control circuit dynamically adjusts the first weighting value and the second weighting value according to the equalizer output signal.