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Digital Signal Processing A Computer Based Approach

A light emitting diode (LED) lighting system includes a PFC and output voltage controller and a LED lighting power system. The controller advantageously operates from an auxiliary voltage less than a link voltage generated by the LED lighting power system. The common reference voltage allows all the components of lighting system to work together. A power factor correction switch and an LED drive current switch are coupled to the common reference node and have control node-to-common node, absolute voltage that allows the controller to control the conductivity of the switches. The LED lighting system can utilize feed forward control to concurrently modify power demand by the LED lighting power system and power demand of one or more LEDs. The LED lighting system can utilize a common current sense device to provide a common feedback signal to the controller representing current in at least two of the LEDs.

Power control system for current regulated light sources

In at least one embodiment, a controller allows triac-based dimmer to properly function and dim a load whose voltage is regulated by a switching power converter. In at least one embodiment, the switching power converter includes a switch to control voltage conversion of an input voltage to the switching power converter, wherein phase delays are introduced in the input voltage by a triac-based dimmer during a dimming period. In at least one embodiment, the controller is configured to control the switch of the switching power converter to establish an input resistance of the switching power converter during a dimming portion of the input voltage, wherein the input resistance allows the triac-based dimmer to phase modulate a supply voltage to the dimmer so that an output voltage of the dimmer has a substantially uninterrupted phase delay during each half-cycle of the supply voltage during the dimming period.

Switching power converter control with triac-based leading edge dimmer compatibility

A light emitting diode (LED) lighting system includes a power factor correction (PFC) controller that determines at least one power factor correction control parameter from phase delays of a phase modulated signal. In at least one embodiment, a peak voltage of the phase modulated signal is a PFC control parameter used by the PFC controller to control power factor correction and generation of a link voltage by a PFC LED driver circuit. The phase delays are related to a peak voltage of the phase modulated signal. Thus, in at least one embodiment, detecting the phase delay in one or more cycles of the phase modulated signal allows the PFC controller to determine the peak voltage of the phase modulated signal.

Lighting system with power factor correction control data determined from a phase modulated signal

A light emitting diode (LED) lighting system includes a controller to control current in one or more LEDs in response to a dimming level input. The LED lighting system implements a dimming strategy having two modes of operation that allow the LED lighting system to dim the LEDs using an active value of an LED current less than a full value LED current while maintaining continuous conduction mode operation. In an active value varying mode of operation, the controller varies an active value of the LED current for a first set of dimming levels. In an active value, duty cycle modulation mode of operation, the controller duty cycle modulates an active value of the LED current for a second set of dimming levels. In at least one embodiment, the active value of the LED current varies from a full active value to an intermediate active value as dimming levels decrease.

LED lighting system with a multiple mode current control dimming strategy

Proceedings of the International Conference on New Interfaces for Musical Expression

A characterization method for verifying stability and measuring the performance quality of arbitrary noise transfer functions for the delta-sigma modulator is presented The method consists of first obtaining the maximum stable input range sweep in the pass-band The variance estimate can then be used to make a sharper upper limit for maximum allowed input range This can then be used to measure the global SNR performance in the pass-band The proposed method enables us to make a comprehensive comparison between arbitrary noise transfer function designs and it can also be used to automate the design of noise transfer functions

A Proposed Stability Characterization and Verification Method for High-Order Single-Bit Delta-Sigma Modulators

This paper compares the use of two different technologies for controlling sound synthesis in real time: the infrared marker-based motion capture system OptiTrack and Xsens MVN, an inertial sensor-based motion capture suit. We present various quantitative comparisons between the data from the two systems and results from an experiment where a musician performed simple musical tasks with the two systems. Both systems are found to have their strengths and weaknesses, which we will present and discuss.

Comparing Inertial and Optical MoCap Technologies for Synthesis Control

With musical applications in mind, this paper reports on the level of noise observed in two commercial infrared marker-based motion capture systems: one high-end (Qualisys) and one affordable (OptiTrack). We have tested how various features (calibration volume, marker size, sampling frequency, etc.) influence the noise level of markers lying still, and fixed to subjects standing still. The conclusion is that the motion observed in humans standing still is usually considerably higher than the noise level of the systems. Dependent on the system and its calibration, however, the signal-to-noise-ratio may in some cases be problematic.

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A study of the noise-level in two infrared marker-based motion capture systems

The paper presents a conceptual overview of how optical infrared marker based motion capture systems (IrMoCap) can be used in musical interaction. First we present a review of related work of using IrMoCap for musical control. This is followed by a discussion of possible features which can be exploited. Finally, the question of mapping movement features to sound features is presented and discussed.

/pdf/using-ir-optical-marker-based-motion-capture-for-exploring-14fd7j8en7.pdf

Ståle Andreas van Dorp Skogstad

Papers

Proceedings of the International Conference on New Interfaces for Musical Expression

A Proposed Stability Characterization and Verification Method for High-Order Single-Bit Delta-Sigma Modulators

Comparing Inertial and Optical MoCap Technologies for Synthesis Control

A study of the noise-level in two infrared marker-based motion capture systems

Using IR Optical Marker Based Motion Capture for Exploring Musical Interaction