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This paper presents an implementation of a high power 32-bit Ternary Digital to Analog Converter (“TriDAC”) with a new topology, originally designed as a stimulus generator for audiometry, capable of a very high dynamic range of more than 170 dB.
This paper presents the development of distance sensors to measure air-gap irregularities in synchronous generators for diagnosing static eccentricities. Capacitive and inductive sensors were developed to measure the thickness of the air-gap between the stator and the rotor poles. In order to obtain an absolute measurement of distance, an optical fiber chromatic confocal sensor system is used as a...
This paper presents the development of distance sensors to measure air-gap irregularities in synchronous generators. Among various causes, air-gap anomalies may arise due to shaft eccentricity, which will be dealt with in this work. A prototype machine was specially manufactured allowing the deformation of rotor and stator yokes, as well as the radial displacement of its shaft position. These features...
Quality management is an important criterion to evaluate broadcaster’s transmission system integrity, which can be affected by radiofrequency signal impairments and by coding, multiplexing, and/or modulation errors. The international system integrated services digital broadcasting—terrestrial (ISDB-T) was designed to provide a reliable reception, even with interferences inherent to radio wave propagation...
This paper presents the development of an adaptive gap filler for Digital Terrestrial Television broadcasting. Unlike conventional equipment, which only amplifies and retransmits the desired signal, the proposed system employs cognition principles to analyze the adjacent channels spectrum, thus ensuring the required protection ratio.
This work introduces a new transform-based time interleaving algorithm: FTI-OFDM (Fourier transform interleaved OFDM) in which binary information is spread over several consecutive symbols that can be further scrambled in the frequency domain. Simulations are used to show its superiority over the usual binary time interleaving used in ordinary OFDM under several impairment scenarios that include impulsive...
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