This panel is used to display voltage contour, admittance filter coefficients loaded in device. Tuning of power and voltage limiting for each channel can be performed using this panel.
Power Manager Panel
Channel List
User can select a channel for the current core from a list on the top left of the power manager panel.
Power manager panel: Channel List
Tab selection
User can select Voltage or Power tab to view their specific chart and tuning parameters.
By default, Voltage tab is selected.
Power manager: tab selection
Refresh Panel
Refresh panel option is used to update coefficient filters data without relaunching panel.
Power manager: refresh panel
Coefficient Chart
The panel has a chart that has only total amplitude and total phase graphs.
Power manager: coefficient chart
Contour Filter 1-3
Three separate bi-quadratic filters which are used to model the frequency-dependent peak-voltage limit for the speaker.
Admittance Filter 1-3
Three separate bi-quadratic filters which are used to model the admittance of the speaker. These are used to calculate current consumption and in turn estimate power.
Coefficients cannot be edited.
Tuning Parameters
Voltage limiting parameters
Voltage Threshold Linear Scale: The reference threshold from which the contour filters bias the incoming signal.
Voltage Attack Rate: The rate at which the peak-limiter reduces gain when the contoured threshold has been crossed.
Voltage Release Rate: The rate at which the peak-limiter goes back to unity gain when the contoured threshold is not being crossed.
Voltage-Peak Time-Constant: The tau-constant for the first-order averaging filter used in envelope detection. The envelope level will decay at this rate when the signal-peak is at a lower level.
Power limiting parameters
Short-term Power Threshold: The power threshold over which the short-term power limiter will start reducing gain.
Short-term Average Time: Averaging time-window for the short-term power limiter.
Long-term Power Threshold: The power threshold over which the long-term power limiter will start reducing gain.
Long-term Average Time: Averaging time-window for the long-term power limiter.
Power Attack Rate: The rate at which any of the power limiters will reduce gain when the threshold is crossed.
Power Release Rate: The rate at which any of the power limiters will go back to unity gain when the threshold is not being crossed.
Power Depth: The maximum attenuation allowed for the power limiters.
Changing the parameter value
User can change the value in four ways:
- Moving the slider button.
- Using the mouse scroll button.
- Changing the value in the text box – value and visual representation will be updated after clicking enter or when text box will lose selection.
- Increase/decrease delay by calculated step value using increase and decrease buttons
Maximum/Minimum parameter value
Maximum and minimum parameter values are derived from the GTT in the Symbol Descriptor.