Patent ID: 7759622
Filing Date: 2010-07-20
Classification: H05B

Abstract:
1. An apparatus, comprising: a plurality of light emitters; at least one photosensor positioned to sense an aggregate light emitted by the light emitters; and a control system to: (i) modulate a plurality of drive currents in accordance with at least one modulation sequence for a predetermined period of time, (ii) apply the modulated drive currents to the light emitters during the predetermined period of time, (iii) correlate a stream of optical measurements taken by the at least one photosensor during the predetermined period of time, and before or after such predetermined period of time, with the at least one modulation sequence to extract optical responses to each or a subset of the plurality of drive currents, and (iv) regulate each drive current or subset of drive currents based on their relationships to their corresponding optical responses.