Define THD (Total Harmonic Distortion) in audio systems.
1 Answer
Total Harmonic Distortion (THD) is a measure used in audio systems to quantify the level of distortion present in a signal, particularly when amplifying or processing audio signals. It is an important parameter to assess the fidelity and quality of audio reproduction. THD quantifies the extent to which additional frequencies (harmonics) are introduced into an audio signal as a result of nonlinearities in the system, typically caused by electronic components like amplifiers or speakers.
In simpler terms, when an audio system introduces THD, it means that the output signal contains frequencies that were not present in the original input signal. These additional frequencies are typically integer multiples (harmonics) of the original signal's frequency. The presence of these unwanted harmonics can lead to a distortion of the sound, altering its timbre and overall quality.
THD is expressed as a percentage or in decibels (dB) and is calculated by dividing the sum of the amplitudes of all harmonic frequencies by the amplitude of the fundamental frequency (the original input signal). A lower THD value indicates better audio quality and less distortion, while a higher THD value indicates greater distortion and potential degradation of sound quality.
A common goal in designing and evaluating audio equipment is to minimize THD to achieve accurate and faithful audio reproduction. Various methods and technologies are employed to reduce THD in audio systems, including careful circuit design, feedback mechanisms, and advanced signal processing techniques.
In simpler terms, when an audio system introduces THD, it means that the output signal contains frequencies that were not present in the original input signal. These additional frequencies are typically integer multiples (harmonics) of the original signal's frequency. The presence of these unwanted harmonics can lead to a distortion of the sound, altering its timbre and overall quality.
THD is expressed as a percentage or in decibels (dB) and is calculated by dividing the sum of the amplitudes of all harmonic frequencies by the amplitude of the fundamental frequency (the original input signal). A lower THD value indicates better audio quality and less distortion, while a higher THD value indicates greater distortion and potential degradation of sound quality.
A common goal in designing and evaluating audio equipment is to minimize THD to achieve accurate and faithful audio reproduction. Various methods and technologies are employed to reduce THD in audio systems, including careful circuit design, feedback mechanisms, and advanced signal processing techniques.