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Related Concept Videos

IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations01:08

IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations

Identical bonds within a polyatomic group can stretch symmetrically (in-phase) or asymmetrically (out-of-phase). Similar to hydrogen bonding, these vibrations also influence the shape of the IR peak. Generally, asymmetric stretching frequencies are higher than symmetric stretching frequencies. For example, primary amines exhibit two distinct IR peaks between 3300–3500 cm−1 corresponding to the symmetric and asymmetric N-H stretching, while secondary amines exhibit a single stretching vibration...
Aliasing01:18

Aliasing

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 signal...
Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
Two-Dimensional (2D) NMR: Overview01:12

Two-Dimensional (2D) NMR: Overview

The 1D NMR spectrum of large and complex molecules like natural products has complicated splitting patterns and overlapping signals, which can be easily interpreted using 2-dimensional (2D) NMR. Unlike 1D NMR, 2D NMR has two frequency axes that provide the coupling information between the nucleus A and nucleus B in a molecule. The process from which 2D spectra are obtained has four steps.
The first step is the preparation period, during which nucleus A is excited with a radiofrequency pulse.
Perceiving Loudness, Pitch, and Location01:21

Perceiving Loudness, Pitch, and Location

The human brain perceives pitch through two primary mechanisms reflected in place theory and frequency theory. Each mechanism describes how sound waves are interpreted as specific pitches by the brain, offering insights into the intricate processes of auditory perception.
Place theory, or place coding, suggests that different pitches are heard because various sound waves activate specific locations along the cochlea's basilar membrane. The brain determines the pitch of a sound by identifying...
Auditory Perception01:17

Auditory Perception

The auditory system is essential for sound perception, utilizing various critical structures. When sound waves enter the outer ear, they travel through the ear canal and cause the eardrum to vibrate. These vibrations are then transmitted to the middle ear, where three tiny bones – the malleus, incus, and stapes – amplify the sound. This amplification is crucial, as it ensures that the sound vibrations are strong enough to be conveyed to the inner ear. These vibrations then reach the cochlea, a...

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Related Experiment Video

Updated: Jun 12, 2026

Behavioral Assessment of Hearing in 2 to 4 Year-old Children: A Two-interval, Observer-based Procedure Using Conditioned Play-based Responses
14:05

Behavioral Assessment of Hearing in 2 to 4 Year-old Children: A Two-interval, Observer-based Procedure Using Conditioned Play-based Responses

Published on: January 23, 2017

Experimental considerations for 2-D acoustooptic spectrum analysis.

H Ansari, B D Metscher, J R Lesh

    Applied Optics
    |June 26, 2010
    PubMed
    Summary
    This summary is machine-generated.

    A novel 2-D acoustooptic spectrum analyzer was developed for real-time spectral analysis. This system enables high-resolution spectrum acquisition, advancing optical signal processing capabilities.

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    Three-dimensional Optical-resolution Photoacoustic Microscopy
    08:31

    Three-dimensional Optical-resolution Photoacoustic Microscopy

    Published on: May 3, 2011

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    Last Updated: Jun 12, 2026

    Behavioral Assessment of Hearing in 2 to 4 Year-old Children: A Two-interval, Observer-based Procedure Using Conditioned Play-based Responses
    14:05

    Behavioral Assessment of Hearing in 2 to 4 Year-old Children: A Two-interval, Observer-based Procedure Using Conditioned Play-based Responses

    Published on: January 23, 2017

    Three-dimensional Optical-resolution Photoacoustic Microscopy
    08:31

    Three-dimensional Optical-resolution Photoacoustic Microscopy

    Published on: May 3, 2011

    Area of Science:

    • Optics and Photonics
    • Signal Processing
    • Instrumentation

    Background:

    • Acoustooptic devices offer unique capabilities for real-time spectral analysis.
    • High-resolution spectral analysis is crucial for various scientific and engineering applications.
    • Existing methods may have limitations in speed or resolution for dynamic signals.

    Purpose of the Study:

    • To construct and describe a two-dimensional (2-D) acoustooptic spectrum analyzer.
    • To detail the operation of the analyzer, including its reference function generator and real-time image processor.
    • To outline experimental considerations for achieving high-resolution spectral analysis in real time.

    Main Methods:

    • Construction of a 2-D acoustooptic spectrum analyzer system.
    • Integration of a reference function generator for system calibration and performance evaluation.
    • Implementation of a real-time image processor for rapid data acquisition and analysis.

    Main Results:

    • Successful construction and demonstration of the 2-D acoustooptic spectrum analyzer.
    • Characterization of the analyzer's operational parameters and performance metrics.
    • Validation of the system's capability for real-time, high-resolution spectral analysis.

    Conclusions:

    • The developed 2-D acoustooptic spectrum analyzer is a viable tool for real-time spectral analysis.
    • The system provides a foundation for advanced optical signal processing and measurement.
    • Further research can explore optimizations for enhanced resolution and broader applications.