Definition

Noun: * Amplitude Distortion: A type of signal distortion where the output signal from a system (such as an amplifier or a transmission channel) is not a linear function of the input signal. This means the shape of the output waveform is altered because the system's gain (amplification) is not constant across all input signal levels. It is a specific form of nonlinear distortion.

Usage

• Amplitude distortion is a critical parameter in audio engineering and telecommunications, as it degrades signal fidelity.
• The term is used to describe an unwanted effect in electronic circuits, particularly when components are driven beyond their linear operating range.

Examples

• When the input to the amplifier was too high, significant amplitude distortion was observed in the output waveform.
• High-fidelity audio equipment is designed to minimize amplitude distortion to preserve the original sound quality.
• The engineer measured the amplitude distortion of the circuit to ensure it met the design specifications.

Advanced Usage

• Amplitude distortion is often quantified using metrics like Total Harmonic Distortion (THD) or Intermodulation Distortion (IMD), which measure the unwanted frequency components generated by the nonlinearity.
• In the context of digital signals, a closely related concept is clipping, which is a severe form of amplitude distortion where the signal peaks are "cut off."

Variants and Related Words

• Nonlinear Distortion (noun): A broader category of distortion that includes amplitude distortion as a primary type. It refers to any distortion caused by a nonlinear relationship between input and output.
• Harmonic Distortion (noun): A specific manifestation of amplitude distortion where new frequencies (harmonics) are generated that are integer multiples of the original input frequencies.
• Clipping (noun): An extreme case of amplitude distortion where the signal exceeds the maximum or minimum limits a system can handle, resulting in a flattened waveform.

Synonyms

• Nonlinear Distortion
• Gain Nonlinearity

Related Concepts (Not Phrasal Verbs or Idioms)

• Linear System: A system where the output is directly proportional to the input, and therefore does not produce amplitude distortion.
• Transfer Characteristic: The graph plotting output versus input for a system; a curved line indicates potential for amplitude distortion.
• Saturation: A state in amplifiers or magnetic cores that leads to amplitude distortion.

Noun

1. distortion that occurs when the output signal does not have a linear relation to the input signal