Audio Signal Correction Apparatus with Dynamic Coefficient Estimation
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Solution Overview
Problem
Existing signal correction apparatuses fail to fully approximate the power of input audio signals to a reference power, especially when input power is excessively higher or lower at certain frequencies due to noise or propagation delays.
Innovation Solution
A signal correction apparatus that computes the power of audio signals at every frequency, estimates a continuous correction function relating each frequency to a correction coefficient, and multiplies the power by this coefficient to approximate it to a reference power, using a polynomial function to adjust the correction coefficient based on time-averaged powers from multiple microphones.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a predetermined correction coefficient is used for each frequency to approximate audio signal power to reference power, then the correction process is simple and fast, but the power approximation is inaccurate when input power is excessively higher or lower at certain frequencies
Solution Approach 1:
The patent changes the parameter of correction coefficient from a fixed predetermined value to a dynamically estimated value based on the correction function. The correction function estimation unit estimates the correction function by analyzing the relationship between frequency and power ratio, then uses this function to determine appropriate correction coefficients that adapt to actual signal conditions, thereby improving power approximation accuracy.
Solution Approach 2:
The patent replaces the simple predetermined coefficient method with a correction function estimation mechanism. Instead of using fixed mechanical-like predetermined values, the system introduces an estimation process that analyzes power ratios across frequencies and generates correction coefficients based on estimated transfer functions, substituting a more sophisticated computational approach for the simpler predetermined method.
2Reliability
If correction coefficients are predetermined for each frequency, then the correction process is straightforward, but it cannot handle cases where input power is excessively higher or lower due to noise or propagation delays
Solution Approach 1:
The patent introduces dynamics into the correction process by making the correction coefficient adaptive rather than static. The correction function estimation unit continuously estimates the correction function based on current signal conditions, allowing the system to dynamically adjust correction coefficients in response to varying input conditions such as noise or propagation delays, thereby improving reliability under different operating conditions.
Solution Approach 2:
The patent implements a feedback mechanism where the power ratio between input and reference signals is analyzed to estimate the correction function. The estimated correction function then feeds back to determine the correction coefficients, creating a closed-loop system that continuously adapts to signal conditions. This feedback approach enables the system to handle varying conditions reliably by using actual signal characteristics to guide correction.
Data Source
AI summary
A signal correction apparatus receives an input audio signal (serving as a first sound reception means). The signal correction apparatus computes, at every frequency, first power that indicates magnitude of sound represented by the input audio signal (serving as a first power computation means). The signal correction apparatus estimates a correction function that is a continuous function defining a relation between each frequency and a correction coefficient used to approximate the first power computed at that frequency to the reference power predetermined for that frequency (serving as a correction function estimation means). The signal correction apparatus multiplies the computed first power by the correction coefficient acquired in accordance with the relation defined by the estimated correction function so as to correct the first power at every frequency (serving as a power correcting means).