Parallel AGC Gain Range Detection for Clipping-Free Audio Tuning
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Solution Overview
Problem
Traditional Automated Gain Control (AGC) protocols in media monitoring meters waste time and resources by testing a full range of gain levels each time, starting at either maximum or minimum gain, regardless of the audio volume, leading to inefficient signature generation and watermark extraction.
Innovation Solution
Implementing an AGC parameter protocol that uses multiple tuners in parallel to identify a smaller range of gain levels where the border between clipping and no clipping occurs, reducing the range of gain levels for the AGC protocol, thereby optimizing the gain selection process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional AGC protocols test the full range of gain levels starting at maximum or minimum gain, then the complete gain range is covered ensuring accurate clipping detection, but the time and computational resources are wasted by testing unnecessary gain levels
Solution Approach 1:
The patent applies preliminary action by first performing a quick assessment of the audio signal characteristics (such as signal level, dynamic range, or spectral content) before initiating the full AGC protocol. This preliminary step identifies the likely optimal gain range, allowing the subsequent AGC protocol to start from a pre-determined gain level rather than testing the entire range from maximum or minimum. This resolves the contradiction by maintaining clipping detection accuracy while significantly reducing the time and computational resources needed.
Solution Approach 2:
The patent implements dynamics by making the AGC protocol adaptive based on real-time audio signal analysis. The system dynamically adjusts the gain range and starting point of the AGC protocol according to the characteristics of the current audio signal. For example, if the signal is already at a high level, the protocol starts from a lower gain and searches upward; if the signal is low, it starts from a higher gain. This dynamic adaptation ensures accurate clipping detection while minimizing unnecessary tests, thus reducing execution time.
2Reliability
If traditional AGC protocols test all gain levels regardless of audio volume, then all possible gain settings are evaluated ensuring optimal gain selection, but computational resources are wasted on unnecessary tests
Solution Approach 1:
The patent applies segmentation by dividing the full gain range into multiple segments or sub-ranges based on preliminary audio signal analysis. Instead of testing all gain levels uniformly, the system first identifies which segment is most likely to contain the optimal gain setting. The AGC protocol then focuses its detailed testing within that specific segment, reducing the number of gain levels that need to be evaluated. This segmentation approach maintains reliable gain selection by ensuring thorough testing within the relevant range while significantly reducing computational resource consumption by avoiding tests in irrelevant ranges.
3Adaptability or versatility
If the AGC protocol starts at maximum gain, then high volume signals can be handled, but low volume signals may be clipped during the initial testing phase
Solution Approach 1:
The patent implements feedback by continuously monitoring the audio signal characteristics during the AGC protocol execution and using this information to adjust the gain testing strategy in real-time. The system analyzes the signal level, dynamic range, and other characteristics to determine the appropriate starting gain level and search direction. This feedback mechanism ensures that the protocol adapts to both high and low volume signals appropriately, preventing clipping of low volume signals during initial testing while maintaining the capability to handle high volume signals. The feedback loop resolves the contradiction by making the protocol versatile across different signal levels without causing harmful clipping effects.
Data Source
AI summary
Methods and apparatus to determine automated gain control parameters for an automated gain control protocol are disclosed. An example apparatus includes a first tuner to amplify an audio signal. Disclosed example apparatus also include a second tuner to amplify the audio signal. Disclosed example apparatus also include a first controller to tune the first tuner to apply a first gain representative of a first range of gains to the audio signal to determine a first amplified audio signal and tune the second tuner to apply a second gain representative a second range of gains to the audio signal to determine a second amplified audio signal, the second range of gains lower than the first range of gains. Disclosed example apparatus also include a second controller to select the first range of gains to be utilized in an automated gain control protocol when the first gain results in clipping of the first amplified audio signal and the second gain does not result in clipping of the second amplified audio signal.