Although applicable to other waveforms, in the context of library- and archive-related digitization, THD is generally discussed in terms of sound. The total harmonic distortion of a signal is defined [..]

Of a signal, the ratio of (a) the sum of the powers of all harmonic frequencies above the fundamental frequency to (b) the power of the fundamental frequency. Note 1: The THD is usually expressed in dB. Note 2: Measurements for calculating the THD are made at the output of a device under specified conditions.

The total harmonic distortion introduced into a system compared to a normal sine-wave.

The square root of the sum of the squares of the RMS harmonic voltages or currents divided by the RMS fundamental voltage or current. Can also be calculated in the same way for only even harmonics or [..]

A measurement of the harmonic distortion present and is defined as the ratio of the sum of the powers of all harmonic components to the power of the fundamental frequency. For details on total harmoni [..]

The ratio of the root-mean- square of the harmonic content to the root-mean-square value of the fundamental quantity, expressed as a percent of the fundamental. Typically a supply sine wave is conside [..]

A measure of the degree to which a sinusoidal wave shape is distorted by harmonics, with higher values of THD indicating greater distortion.

the sum of all amplifier distortion components, plus system noise. THD measurements are sometimes quoted as THD+noise. Usually measured at specified frequencies and power levels

the sum of all amplifier distortion components, plus system noise. THD measurements are sometimes quoted as THD+noise. Usually measured at specified frequencies and power levels.

the RMS value of the harmonic components of the output signal, excluding the fundamental, expressed as a percentage of the RMS of the fundamental.

[THD] Of a signal, the ratio of the sum of the powers of all harmonic frequencies above the fundamental frequency to the power of the fundamental frequency. The measure of closeness in shape between a [..]

See harmonic distortion.