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Statements

Subject Item
dbr:SSDM
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dbr:Stochastic_Signal_Density_Modulation
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dbr:Stochastic_Signal_Density_Modulation
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Stochastic Signal Density Modulation
rdfs:comment
Stochastic Signal Density Modulation (SSDM) is a novel power modulation technique primarily used for LED power control. The information is encoded - or the power level is set - using pulses that have pseudo-random widths. The pulses are produced so that, on average, the produced signal will have the desired ratio between high and low states. The main benefit of using SSDM over, for example, Pulse-width modulation (PWM), which is usually the preferred method for controlling LED power, is reduced electromagnetic interference. Figure 1 illustrates a SSDM signal and demonstrates how the average signal density approaches desired value. The pseudo-random pulses in the signal are visible.
foaf:depiction
n8:SSDM_5bits_30pct_sequence.png n8:SSDM_6bits_40pct_with_average.png n8:SSDM_vs_PWM_10pct_70pct_sequence.png n8:SSDM_vs_PWM_2khz_spectrum.png n8:SSDM-Generation.png
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dbc:Electrical_components
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1087034561
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n7:SSDM_vs_PWM_2khz_spectrum.png dbr:Pulse-width_modulation dbr:Linear-feedback_shift_register n7:SSDM-Generation.png dbr:Electromagnetic_interference n7:SSDM_5bits_30pct_sequence.png dbc:Electrical_components n7:SSDM_6bits_40pct_with_average.png dbr:Power_semiconductor_device dbr:Delta-sigma_modulation dbr:Pulse-density_modulation dbr:Flicker_fusion_threshold n7:SSDM_vs_PWM_10pct_70pct_sequence.png
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dbo:abstract
Stochastic Signal Density Modulation (SSDM) is a novel power modulation technique primarily used for LED power control. The information is encoded - or the power level is set - using pulses that have pseudo-random widths. The pulses are produced so that, on average, the produced signal will have the desired ratio between high and low states. The main benefit of using SSDM over, for example, Pulse-width modulation (PWM), which is usually the preferred method for controlling LED power, is reduced electromagnetic interference. Figure 1 illustrates a SSDM signal and demonstrates how the average signal density approaches desired value. The pseudo-random pulses in the signal are visible. SSDM can be seen as a special case of Pulse-density modulation (PDM) or Random Pulse Width Modulation (RPWM).
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