Ring Modulator

vignette|Schéma d'un ring modulator Le ring modulator (modulateur en anneau) est un effet audio de modulation utilisant un oscillateur pour créer une onde sinusoïdale, qui est ensuite multipliée avec le signal de départ (celui d'une guitare par exemple) pour produire de nouvelles harmoniques. C'est aussi un effet que l'on retrouve sur de nombreux synthétiseurs où un oscillateur est utilisé pour en moduler un autre, ce qui produit des sons de cloche caractéristiques. Voir aussi

Pédale d'effet
Technologies des musiques amplifiées

Catégorie:Effet audio

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Musique électronique

La musique électronique est un type de musique conçu dans les années 1950 avec des générateurs de signaux et de sons synthétiques. Avant de pouvoir être utilisée en temps réel, elle a été enregistré

Pédale d'effet

thumb|Pédale de distorsion Boss DS-1, l'une des plus répandues au monde. vignette|Un guitariste joue une mélodie puis enclenche une pédale d'overdrive au pied. Une pédale d'effet est un petit appare

Synthétiseur analogique

vignette|Le Buchla Music Easel, un synthétiseur analogique modulaire de 1973. Un synthétiseur analogique est un synthétiseur qui utilise des circuits analogiques et des signaux électriques analogiques

EE-442: Wireless receivers: algorithms and architectures

The students will learn about the basic principles of wireless communication systems, including transmission and modulation schemes as well as the basic components and algorithms of a wireless receiver. They develop an understanding for the wireless channel and system performance and limitations.

A CLOSED LOOP CONTROL STRATEGY FOR A FREQUENCY-ONLY CONVERTER WITH HIGH EFFICIENCY

Aziza Benaboud, Alfred Rufer

Many electric power generators use gas turbines as power sources, coupled through a mechanical gearbox in order to adapt their synchronous speed to the optimal rotation speed of the turbine. This paper proposes to replace the mechanical gearbox with a flexible electronic solution which would offer a higher efficiency. A new control strategy is proposed for the three level Neutral Point Clamped converter, which is characterized by its high efficiency due to the use of square-wave modulation. The main advantage of this modulation is the quasi absence of switching losses. In this modulation, only the frequency can be adapted between the input and the output voltages, but their magnitudes are not freely controllable. The active and reactive powers produced can be controlled by the generator’s excitation, as well as both the angle shift between the generator’s and rectifiers's voltages and between the inverter’s and network’s voltages. The simulation and a partial experimental results for different operating points highlight the capabilities of the proposed control strategy.

2007

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A Flexible, High Efficiency, VSI-based HVDC Transmission System with Reduced Harmonics

Aziza Benaboud, Alfred Rufer

In this paper a High Voltage Direct Current (HVDC) transmission system is proposed, based on using three level three phase (3L3P) converters, coupled through a specific transformer connection in order to benefit from natural and selective harmonic cancellation effects. In opposition to classical PWM-VSI- based HVDC systems, the presented converter configuration uses Square Wave Modulation in order to keep the switching loss to a minimum value. Because of the SWM leads to the loose of the control of the input-to-output voltage ratio, special properties of the transmission system are described, regarding the active and reactive power control strategy. For the present contribution, three principal sections are defined; the power flow control; the 3L3P-NPC inverter with its control in SWM, and the dedicated transformer section with its specific connection. Simulation results are shown to highlight the capacity of the proposed system.

2008

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New Control Strategy for Three Level NPC Converter Connected to the Grid

Aziza Benaboud, Alfred Rufer

The aim of the present paper is to describe a new control strategy for a three level NPC converter connected to the grid, characterized by its high efficiency. This efficiency is achieved using a square wave modulation or SWM, which has the advantage of a quasi absence of switching losses. The produced active and reactive power can be controlled by voltage magnitude adaptation in the input of the inverter, together with a phase shift between the grid and output inverter voltages. Therefore, the phase-locked loop (PLL) can be considered to be an important part of the power generation system connected to the grid. The contributions of the paper include an approach to achieve a robust PLL, a discussion of the properties and operation performance of the new control strategy, as well as the corresponding characteristic curves. The performance will be illustrated through simulation examples as well as experimental results.

2006

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