{"id":19137,"date":"2022-12-19T13:21:18","date_gmt":"2022-12-19T12:21:18","guid":{"rendered":"https:\/\/demdlx704as001.ad.harman.com\/?post_type=documentor-sections&p=19137"},"modified":"2024-04-05T10:43:44","modified_gmt":"2024-04-05T08:43:44","slug":"power-manager-2","status":"publish","type":"post","link":"https:\/\/audioworx.transfunnel.co\/old\/?p=19137","title":{"rendered":"Power Manager"},"content":{"rendered":"

The aim of Power Manager is to protect speakers from damage. The object consists of three limiters grouped into two main sub-blocks. The peak-voltage sub-block consists of a frequency-dependent limiter which protects against cone over-excursion. The power-limiter sub-block is made up of a short-term and a long-term limiter, each of which can be configured to attack at a distinct power threshold over an independent time-averaging window.
\n<\/span>The power limiter is meant to protect the speaker\u2019s components from overheating. The Power Manager AO has the following additional parameters:<\/span><\/p>\n

Design Time Parameters<\/strong><\/p>\n

Look-ahead delay [samples]:<\/strong> The fixed delay in samples for the audio signal. This delay improves the response of the peak-voltage limiter at frequencies over 10 kHz.<\/span><\/p>\n

Tuning Parameters<\/strong><\/p>\n

Power manager exposes below parameters as tuning parameters in GTT for each channel:<\/span><\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
\n
Name<\/strong><\/span><\/div>\n<\/td>\n
\n
Unit<\/strong><\/span><\/div>\n<\/td>\n
\n
Format<\/strong><\/span><\/div>\n<\/td>\n
\n
Range<\/strong><\/span><\/div>\n<\/td>\n
\n
Default<\/strong><\/span><\/div>\n<\/td>\n
Description<\/strong><\/span><\/td>\n<\/tr>\n
Short-term Average Time<\/strong><\/span><\/td>\ns<\/span><\/td>\nFloat<\/span><\/td>\n0.1 – 100<\/span><\/td>\n2<\/span><\/td>\nAveraging time-window for the short-term power limiter.<\/span><\/td>\n<\/tr>\n
Long-term Average Time<\/strong><\/span><\/td>\ns<\/span><\/td>\nFloat<\/span><\/td>\n0.1 – 100<\/span><\/td>\n10<\/span><\/td>\nAveraging time-window for the long-term power limiter.<\/span><\/td>\n<\/tr>\n
Short-term Power Threshold<\/strong><\/span><\/td>\nW<\/span><\/td>\nFloat<\/span><\/td>\n0 – 100<\/span><\/td>\n10<\/span><\/td>\nThe power threshold over which the short-term power limiter will start reducing gain.<\/span><\/td>\n<\/tr>\n
Long-term Power Threshold<\/strong><\/span><\/td>\nW<\/span><\/td>\nFloat<\/span><\/td>\n0 – 100<\/span><\/td>\n5<\/span><\/td>\nThe power threshold over which the long-term power limiter will start reducing gain.<\/span><\/td>\n<\/tr>\n
Power Attack Rate<\/strong><\/span><\/td>\ns<\/span><\/td>\nFloat<\/span><\/td>\n0 – 5<\/span><\/td>\n1<\/span><\/td>\nThe rate at which any of the power limiters will reduce gain when the threshold is crossed.<\/span><\/td>\n<\/tr>\n
Power Release Rate<\/strong><\/span><\/td>\ns<\/span><\/td>\nFloat<\/span><\/td>\n0 – 5<\/span><\/td>\n1<\/span><\/td>\nThe rate at which any of the power limiters will go back to unity gain when the threshold is not being crossed.<\/span><\/td>\n<\/tr>\n
Power Depth<\/strong><\/span><\/td>\n–<\/span><\/td>\nFloat<\/span><\/td>\n0 – 1<\/span><\/td>\n3.8E-07<\/span><\/td>\nThe maximum attenuation allowed for the power limiters.<\/span><\/td>\n<\/tr>\n
Voltage-Peak Time-Constant<\/strong><\/span><\/td>\ns<\/span><\/td>\nFloat<\/span><\/td>\n0 – 5<\/span><\/td>\n0.008<\/span><\/td>\nThe 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.<\/span><\/td>\n<\/tr>\n
Voltage Threshold Linear Scale<\/strong><\/span><\/td>\nV<\/span><\/td>\nFloat<\/span><\/td>\n0 – 100<\/span><\/td>\n1<\/span><\/td>\nThe reference threshold from which the contour filters bias the incoming signal.<\/span><\/td>\n<\/tr>\n
Voltage Attack Rate<\/strong><\/span><\/td>\ns<\/span><\/td>\nFloat<\/span><\/td>\n0 – 30000<\/span><\/td>\n2000<\/span><\/td>\nThe rate at which the peak-limiter reduces gain when the contoured threshold has been crossed.<\/span><\/td>\n<\/tr>\n
Voltage Release Rate<\/strong><\/span><\/td>\ns<\/span><\/td>\nFloat<\/span><\/td>\n0 – 30000<\/span><\/td>\n500<\/span><\/td>\nThe rate at which the peak-limiter goes back to unity gain when the contoured threshold is not being crossed.<\/span><\/td>\n<\/tr>\n
Voltage Scalar<\/strong><\/span><\/td>\nV<\/span><\/td>\nFloat<\/span><\/td>\n1 – 100<\/span><\/td>\n1<\/span><\/td>\nThe relation between the configured limiter-threshold voltage and the output voltage of the power IC used.<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

In Addition to above tuning parameter Power manger uses below filters to model Peak-voltage and admittance of speaker<\/span><\/p>\n

Contour Filters:<\/strong> Cascade of three bi-quadratic filters which are used to model the frequency-dependent peak-voltage limit for the speaker.<\/span><\/p>\n

Admittance Filters:<\/strong> Cascade of three 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.<\/span><\/p>\n

Contour filters and Admittance filters coefficients loaded into DSP\/Amplifier can be visualized in SV tree and GTT panel.<\/span><\/p>\n\n\n\n\n\n\n\n\n
\n
Name<\/strong><\/span><\/div>\n<\/td>\n
\n
Unit<\/strong><\/span><\/div>\n<\/td>\n
\n
Format<\/strong><\/span><\/div>\n<\/td>\n
\n
Range<\/strong><\/span><\/div>\n<\/td>\n
\n
Default<\/strong><\/span><\/div>\n<\/td>\n<\/tr>\n
b0<\/strong><\/span><\/td>\n–<\/span><\/td>\nFloat<\/span><\/td>\n-100 – 100<\/span><\/td>\n1<\/span><\/td>\n<\/tr>\n
b1<\/strong><\/span><\/td>\n–<\/span><\/td>\nFloat<\/span><\/td>\n-100 – 100<\/span><\/td>\n0<\/span><\/td>\n<\/tr>\n
b2<\/strong><\/span><\/td>\n–<\/span><\/td>\nFloat<\/span><\/td>\n-100 – 100<\/span><\/td>\n0<\/span><\/td>\n<\/tr>\n
a1<\/strong><\/span><\/td>\n–<\/span><\/td>\nFloat<\/span><\/td>\n-100 – 100<\/span><\/td>\n0<\/span><\/td>\n<\/tr>\n
a2<\/strong><\/span><\/td>\n–<\/span><\/td>\nFloat<\/span><\/td>\n-100 – 100<\/span><\/td>\n0<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u00a0GTT panel also displays frequency response of filters. Please note that the filter coefficients cannot be tuned from GTT. The filter coefficients are loaded in DSP\/Amplifier through a unique API.<\/span><\/p>\n

Native Panel<\/strong><\/p>\n

PowerManager\u00a0 AO<\/span>\u00a0 supports native panel. The native panel window has different controls for configuring tuning parameters, fields for displaying coefficients and graph for displaying output voltage\/ power. Native panel can be opened by double-clicking on the PowerManager object in the\u00a0 SFD<\/span>.<\/span><\/p>\n

\"\"<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"

The aim of Power Manager is to protect speakers from damage. The object consists of three limiters grouped into two main sub-blocks. The peak-voltage sub-block consists of a frequency-dependent limiter which protects against cone over-excursion. The power-limiter sub-block is made up of a short-term and a long-term limiter, each of which can be configured to 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