Abstract:
The invention relates to a method specially designed for detecting events associated with partial discharges (PDs) in high voltage cables, comprising the identification of the location and the evaluation of the amplitude and rate of repetition per period of the grid voltage, with the possibility of identifying different sources producing PD signals as a function of the location thereof and recognising the type of defect associated with PDs in the same location, including the measurement of the generated electric signals and the discrimination thereof in relation to the background noise. The invention also relates to a system for carrying out said method, comprising means for discriminating the noise in relation to the transient waveform of the PD, determining the parameters associated therewith, determining the map of sources of PDs along the length of the cable, graphically representing said sources, and identifying the patterns of the sources of PDs separated as a function of the location thereof along the length of the cable.
Abstract:
A video codec of a preferred embodiment is suitable for implementation on a variety of platforms, including platforms where devices require both encoding and decoding engines. Various features of preferred embodiment codecs reduce complexity for operations such as motion determination. Channel resources are allocated in preferred embodiments unequally, with an allocation being determined based upon channel conditions and the error level in a frame being encoded. A decoder of a preferred embodiment, provided with an error frame and motion vector information may conduct decoding with motion compensation. In an example encoder of the invention, a motion estimator (120) identifies motion vectors using a phase plane correlation technique based on phase quantization, where the phase difference between the Fourier transformed version of blocks in a reference frame and a current frame is estimated by dividing the complex plane into sectors and assigning the Fourier domain difference to the sectors.
Abstract:
Coding, transcoding and iterative filtering methods and apparatus are described using a concept of a 2D FIFO to implement a CACLA processing. The processing methods are block-oriented. A block-by-block processed input image or input coded image which is delayed in an arbitrary number of lines and columns is provided, in such a way that the output image is still produced in a block-by-block schedule, at a reduced or minimal memory access and memory size cost. A 2D FIFO, being memory-efficient (hence at a minimal memory (access and size) cost) in image block coding and decoding applications is described. The 2D FIFO is a device having an associated scheduling mechanism used for enabling delaying of a block-by-block coded input signal such as an image (e.g. a JPEG, JPEG2000, MPEG-4 or similar image) in an arbitrary number of lines and columns, in such a way that the output image is still produced in a block-by-block schedule. The 2D FIFO tailored memory schedule mechanism can achieve the realignment process at reduced or minimal memory (access and size) cost. The process is functionally identical to delaying the rows and columns of the input image along a set of horizontal and vertical FIFOs, except that the pixels remain clustered in blocks rather than lines.
Abstract:
A microprocessor structure for performing a discrete wavelet transform operation, said discrete wavelet transform operation comprising decomposition of an input signal comprising a vector of r x km input samples, r, k and m being non-zero positive integers, over a specified number of decomposition levels j, where j is an integer in the range 1 to J, starting from a first decomposition level and progressing to a final decomposition level, said microprocessor structure having a number of processing stages, each of said number of processing stages corresponding to a decomposition level j of the discrete wavelet transform operation and being implemented by a number of basic processing elements, the number of basic processing elements implemented in each of said processing stages decreasing by a factor of k from a decomposition level j to a decomposition level j+1.
Abstract:
The invention relates to a method specially designed for detecting events associated with partial discharges (PDs) in high voltage cables, comprising the identification of the location and the evaluation of the amplitude and rate of repetition per period of the grid voltage, with the possibility of identifying different sources producing PD signals as a function of the location thereof and recognising the type of defect associated with PDs in the same location, including the measurement of the generated electric signals and the discrimination thereof in relation to the background noise. The invention also relates to a system for carrying out said method, comprising means for discriminating the noise in relation to the transient waveform of the PD, determining the parameters associated therewith, determining the map of sources of PDs along the length of the cable, graphically representing said sources, and identifying the patterns of the sources of PDs separated as a function of the location thereof along the length of the cable.
Abstract:
The present invention relates to a method and system for automatically detecting faults in a rotating shaft. The invention comprises the steps of: acquiring a vibration signal from the rotating shaft by means of at least one sensor; processing the signal acquired by the sensor in the time domain and in the frequency domain by means of a processor, obtaining energy measurements of the acquired signal as a result of said processing; comparing in the processor the energy measurements with previously established energy patterns; and finally determining if there is any fault in the rotating shaft based on the comparison between the energy measurements and the previously established patterns.