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Related Concept Videos

Machines01:19

Machines

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Machines are complex structures consisting of movable, pin-connected multi-force members that work together to transmit forces. One example of a machine is the cutting plier, which is used to cut wires by applying forces to its handles. When equal and opposite forces are exerted on the handles of the cutting plier, they cause the cutting edges to come together and apply equal and opposite reaction forces on the wire, which are greater than the applied forces.
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Machines: Problem Solving II01:30

Machines: Problem Solving II

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Machines are complex structures consisting of movable, pin-connected multi-force members that work together to transmit forces. Consider a lifting tong carrying a 100 kg load. It comprises movable sections DAF and CBG linked together with member AB.
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Machines: Problem Solving I01:22

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A toggle clamp is a mechanical device commonly used for holding and clamping objects in various applications, such as woodworking, metalworking, and assembly operations. Consider a toggle clamp subjected to a force of 200 N at the handle. The vertical clamping force can be calculated, provided the dimensions of the toggle clamp are known.
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Chronic obstructive pulmonary disease (COPD) is a group of lung conditions that progressively worsen over time, including chronic bronchitis and emphysema. This cluster of diseases collectively leads to a gradual and irreversible decline in lung function over time.
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A Y-connected synchronous generator, grounded through a neutral impedance, is designed to produce balanced internal phase voltages with only positive-sequence components. The generator's sequence networks include a source voltage that is exclusively in the positive-sequence network. The sequence components of line-to-ground voltages at the generator terminals illustrate this configuration.
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Simplified Synchronous Machine Model01:30

Simplified Synchronous Machine Model

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The Synchronous Machine Model is a fundamental tool in analyzing and ensuring the transient stability of power systems. This model simplifies the representation of a synchronous machine under balanced three-phase positive-sequence conditions, assuming constant excitation and ignoring losses and saturation. The model is pivotal for understanding the behavior of synchronous generators connected to a power grid, particularly during transient events.
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Related Experiment Video

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Foreign Accent and Forensic Speaker Identification in Voice Lineups: The Influence of Acoustic Features Based on Prosody
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Vocal Features: From Voice Identification to Speech Recognition by Machine.

Xiaochang Li, Mara Mills

    Technology and Culture
    |June 25, 2019
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    Summary
    This summary is machine-generated.

    This study examines early machine methods for analyzing vocal recordings for speaker identification and speech recognition from 1908-1970. It highlights the evolution from "vocal portraits" to voiceprints and machine speech recognition, driven by automated processing needs.

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    Area of Science:

    • Speech processing
    • Forensic acoustics
    • History of technology

    Background:

    • Early 20th-century phonographic archives collected "vocal portraits" for speaker identification.
    • Investigations focused on unique human voice features for individual recognition.
    • Visual speech records were explored for similar identification applications.

    Observation:

    • Sound spectrography enabled "voiceprint identification" with legal and commercial success in the 1960s.
    • This success drew scientific scrutiny, leading to the discrediting of voiceprint accuracy and rationale.
    • Spectrogram collections simultaneously fueled advancements in machine speech recognition.

    Findings:

    • The status of speech spectrograms shifted from individual voice markers to models of speech sound invariants.
    • Automated processing demands drove this transformation.
    • The focus moved from sound archives to acoustic databases.

    Implications:

    • The historical trajectory reveals the interplay between technological application and scientific validation in voice analysis.
    • The evolution of speech spectrograms influenced the development of modern speech recognition systems.
    • Understanding this history provides context for current biometric and speech technology research.