Polar Audio Channel Display for Relative Phase and Amplitude Logging
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Solution Overview
Problem
Existing audio test equipment struggles to intuitively and effectively display the relationships among multiple audio channels, particularly in multi-channel systems like surround sound, where complexity increases with the number of channels, making it difficult to monitor and adjust audio parameters accurately.
Innovation Solution
A graphic display apparatus and method that plots relative amplitude and phase differences of multiple audio channels using a polar plot with radiating amplitude meter lines, allowing for intuitive comparison of any channel against a reference channel, with selectable meter ballistics and logging capabilities for trend analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional meters or readouts are used to display audio signal characteristics, then signal amplitude and basic parameters can be monitored, but the display becomes unduly complicated and information is lost when three or more channels are involved
Solution Approach 1:
The display is segmented into distinct functional zones: a polar plot area for relative amplitude and phase visualization, a log plot area for historical trend analysis, and an alarm indicator area. Each zone handles specific information types, preventing information overload in any single area while maintaining comprehensive monitoring capability across multiple channels
Solution Approach 2:
The patent transitions from traditional linear or radial meter displays to a two-dimensional polar coordinate system where relative amplitude and phase are simultaneously represented. This dimensional change allows multiple parameters to be visualized in a compact, intuitive format that scales effectively to three or more channels without proportional increase in complexity
2Loss of information
If multiple variables are represented using different display attributes, then more information can be conveyed, but changes occur at the same time possibly obscuring information in the complexity
Solution Approach 1:
Different regions of the display are assigned specific visualization qualities: the polar plot uses angular position and radial distance to represent phase and amplitude respectively, the log plot uses temporal progression to show trends, and alarm indicators use distinct visual markers. This localized optimization ensures each area presents its specific information type clearly without competing with other variables
Solution Approach 2:
The display provides historical context through the log plot area that records past signal characteristics before current conditions develop. This allows operators to see trends and anticipate changes, cushioning against the loss of information that might occur in real-time monitoring alone by providing a buffer of historical data for comparison
3Speed
If peak meter ballistics are used to respond quickly to signal peaks, then amplifier overdrive can be detected, but the meter cannot persist very long in displaying a signal level
Solution Approach 1:
The system dynamically adjusts display persistence based on the type of information being presented. Peak detection in the polar plot provides immediate, short-persistence feedback for rapid response to overdrive conditions, while the log plot maintains longer persistence to show historical trends. This dynamic differentiation allows the system to optimize both response speed and information retention for different monitoring needs
Data Source
AI summary
An audio test device and method provide a visual display of audio parameters for plural audio channels. One audio channel at least temporarily is deemed a reference channel and other channels become relative channel for comparison. Samples from the reference and relative channels produce relative amplitude and relative phase difference values that are plotted on the display. The difference values for pairs of relative channel and reference channel data samples can be plotted as pixels in pie shaped plot segments or other two dimensional plots, one for each relative channel. The relative amplitude and phase differences are presented as positions of pixels along the axes of the plot. This arrangement is particularly useful in showing the current amplitude and phase condition of a multi-channel audio signal. In addition, the amplitude and relative phase data for the channels can be logged over a long time period (a day or more) to show the amplitude and phase conditions as changing over time.