rack::dsp::VuMeter2 Struct Reference

Models a VU meter with smoothing. More...

#include <vumeter.hpp>

Public Types
enum	Mode { PEAK , RMS }

Public Member Functions
void	reset ()
void	process (float deltaTime, float value)
float	getBrightness (float dbMin, float dbMax)
	Returns the LED brightness measuring tick marks between dbMin and dbMax.

Public Attributes
Mode	mode = PEAK
float	v = 0.f
	Either the smoothed peak or the mean-square of the brightness, depending on the mode.
float	lambda = 30.f
	Inverse time constant in 1/seconds.

Detailed Description

Models a VU meter with smoothing.

Supports peak and RMS (root-mean-square) metering. Usage example for a strip of lights with 3dB increments:

// Update VuMeter state every frame.
vuMeter.process(deltaTime, output);
// Iterate lights every ~512 frames (less than a screen refresh).
for (int i = 0; i < 6; i++) {
    float b = vuMeter.getBrightness(-3.f * (i + 1), -3.f * i);
    // No need to use setSmoothBrightness() since VuMeter2 smooths the value for you.
    lights[i].setBrightness(b);
}

Member Enumeration Documentation

Mode

enum rack::dsp::VuMeter2::Mode

Enumerator
PEAK
RMS

Member Function Documentation

reset()

void rack::dsp::VuMeter2::reset ( )

inline

process()

void rack::dsp::VuMeter2::process ( float deltaTime, float value )

inline

getBrightness()

float rack::dsp::VuMeter2::getBrightness ( float dbMin, float dbMax )

inline

Returns the LED brightness measuring tick marks between dbMin and dbMax.

For example, getBrightness(-6.f, 0.f) will be at minimum brightness at -6dB and maximum brightness at 0dB. Set dbMin == dbMax == 0.f for a clip indicator that turns fully on when db >= dbMax. Expensive, so call this infrequently.

Member Data Documentation

mode

Mode rack::dsp::VuMeter2::mode = PEAK

v

float rack::dsp::VuMeter2::v = 0.f

Either the smoothed peak or the mean-square of the brightness, depending on the mode.

lambda

float rack::dsp::VuMeter2::lambda = 30.f

Inverse time constant in 1/seconds.

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The documentation for this struct was generated from the following file:

• /home/vortico/src/vcv/Rack2/include/dsp/vumeter.hpp