Scrambled Pulse Width Modulation
Posted on January 3, 2013 Category: Lighting Terms
What is Scrambled Pulse Width Modulation (S-PWM)?
S-PWM is an enhanced version of normal PWM signaling. This new technology has been patented in several countries due to its innovation and ability to reduce appearance of flickering in high level recording.
How does it work?
The duty cycle of each period is split or “scrambled” into several sub-pulses. The pulses of each channel will coordinate to reduce periods in which all channels are off. S-PWM supports 16-bit gray scale control that allows for greater color resolution and clarity.
This is a new technology – has its capability been proven?
Although new to the commercial market, S-PWM technology has been in use for several years and is well researched. A striking example of its capabilities was shown in the opening ceremony of the 2008 Beijing Olympics, where S-PWM control was used in the control of the over 12,000 square foot LED display.
This technology has also been used in professional studios to reduce flicker recorded by high speed iris cameras.