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Videos de Conceptos Relacionados

Upsampling01:22

Upsampling

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Managing signal sampling rates is essential in digital signal processing to maintain signal integrity. A decimated signal, characterized by a reduced frequency range due to its lower sampling rate, can be upsampled by inserting zeros between each sample. This upsampling process expands the original spectrum and introduces repeated spectral replicas at intervals dictated by the new Nyquist frequency. To refine this zero-inserted sequence, it is passed through a lowpass filter with a cutoff...
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Aliasing01:18

Aliasing

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Accurate signal sampling and reconstruction are crucial in various signal-processing applications. A time-domain signal's spectrum can be revealed using its Fourier transform. When this signal is sampled at a specific frequency, it results in multiple scaled replicas of the original spectrum in the frequency domain. The spacing of these replicas is determined by the sampling frequency.
If the sampling frequency is below the Nyquist rate, these replicas overlap, preventing the original...
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Downsampling01:20

Downsampling

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When considering a sampled sequence with zero values between sampling instants, one can replace it by taking every N-th value of the sequence. At these integer multiples of N, the original and sampled sequences coincide. This process, known as decimation, involves extracting every N-th sample from a sequence, thereby creating a more efficient sequence.
The Fourier transform of the decimated sequence reveals a combination of scaled and shifted versions of the original spectrum. This...
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Sampling Methods: Overview01:06

Sampling Methods: Overview

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A sample refers to a smaller subset representative of a larger population. In analytical chemistry, studying or analyzing an entire population is often impractical or impossible. Therefore, samples are used to draw inferences and generalize the whole population. The sampling method selects individuals or items from a population to create a sample. Standard sampling methods include random, judgemental, systematic, stratified, and cluster sampling. 
In analytical chemistry, the choice of...
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Sampling Continuous Time Signal01:11

Sampling Continuous Time Signal

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In signal processing, a continuous-time signal can be sampled using an impulse-train sampling technique, followed by the zero-order hold method. Impulse-train sampling involves the use of a periodic impulse train, which consists of a series of delta functions spaced at regular intervals determined by the sampling period. When a continuous-time signal is multiplied by this impulse train, it generates impulses with amplitudes corresponding to the signal's values at the sampling points.
In the...
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Pulse amplitude and quality01:17

Pulse amplitude and quality

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Pulse amplitude is a crucial indicator of cardiac health because it provides valuable insights into the strength of left ventricular contractions and the overall uniformity of blood circulation within the vasculature. The strength of the pulse is directly related to the force with which the heart contracts and the volume of blood being pumped.
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Updated: Jan 8, 2026

Microfluidic Platform with Multiplexed Electronic Detection for Spatial Tracking of Particles
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Compresión de datos de alta relación codificada con ANS para un sistema de detección acústica distribuida

Jiayao Sun, Deyu Xu, Jingming Zhang

    Optics express
    |December 19, 2025
    PubMed
    Resumen
    Este resumen es generado por máquina.

    Este estudio presenta un nuevo método de compresión para datos de Detección Acústica Distribuida (DAS), que reduce significativamente el volumen de la señal sin procesar mientras preserva detalles cruciales. Este avance permite una monitorización de vibraciones a gran escala más eficiente para aplicaciones como la detección de terremotos y la seguridad de tuberías.

    Conclusiones:

    • El método propuesto de codificación de entropía basado en ANS comprime eficazmente las señales DAS sin procesar sin sacrificar la resolución espacial ni las características críticas de la señal.
    • Este enfoque supera las limitaciones de la compresión de señales desmoduladas, preservando la información de fase y las características de baja frecuencia.
    • El método proporciona una solución altamente eficiente y robusta para la monitorización DAS a gran escala y a largo plazo en entornos complejos.
    Palabras clave:
    Detección Acústica DistribuidaCompresión de datosCodificación de entropía ANSMonitorización de vibracionesProcesamiento de señales

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