An audio distortion created when a signal passes through electronic circuitry. The signal will pick up unwanted frequencies which are multiples (1X1, 2X, 3X, etc.) of the center frequency of the signal.
harmonics artificially added by an electrical circuit or speaker, and are generally undesirable. It is expressed as a percentage of the original signal. See THD.
The production of spurious frequencies at multiples of the original frequency. A circuit amplifying a 1k Hz sine wave will create frequencies at 2k Hz (second harmonic), 3k Hz (third harmonic), and so forth.
Distortion which is harmonically related to the fundamental signal fed through an audio circuit or system. Harmonic distortion is characterized by a harsh sound that ranges from a slight edge on some of the high-frequency components of a musical program, to the fuzz associated with electric guitar effects pedals.
When any signal is passed through an electronic circuit, the signal may be changed in many ways. In audio, odd harmonics (third, fifth, etc.) produce harsh and unpleasant sounding audio. In video, the image may become blurred, noisy or contain shadows.
The type of distortion most often rated and listed with power specifications and is considered a very good measure of an amplifier's ability to accurately reproduce the tonal quality of the components of music. Most people can detect harmonic distortion greater than 1%, so lower percentages are better.
Presence of harmonic frequencies in a received signal due to nonlinear characteristics of a transmission line.
A harmonic is a sinusoidal component of a periodic wave having a frequency that is a multiple of the fundamental frequency. Harmonic distortion occurs when lighting equipment draws an irregular current waveform and can interfere with other appliances and the operation of electric power networks. The total harmonic distortion (THD) is usually expressed as a percentage of the fundamental line current. All discharge lamp circuits cause some harmonic distortion, and the maximum levels are prescribed in the various Australian Standards.
1. Distortion characterised by the appearance in the output of harmonics other than the fundamental component when the input wave is sinusoidal. 2. Distortion caused by the presence of harmonics of a desired signal. 3. Generation of unwanted harmonics by a device as expressed by the amplitude of the harmonics as a percentage or ratio (in dB) of the primary signal.
In the output signal of a device, distortion caused by the presence of frequencies that are not present in the input signal.
The distortion of a signal as it passes through a transmission medium which is caused by the creation additional, harmonic, frequencies.
Undesired signal harmonics at the output of a device which were not present at the input. See also T.H.D.
Distortion of a signal by adding content that is harmonically related to the original signal. Clipping overload of an amplifier adds odd-order harmonics to the signal.
Spurious harmonics produced by the sound system. Usually not quite as objectionable as intermodulation distortion because harmonics occur naturally in music. See the discussion in the section on music and ears.
A steady-state distortion of the normal sine wave caused by a non-linear load.
The alteration of the normal voltage or current wave shape (sine wave) due to equipment generating frequencies other than the standard 60 cycles per second.
The levels of harmonic distortion are measured with respect to the fundamental signal and are specified in dB.
The form of distortion that occurs when a nonlinear device is driven with a pure tone. See Harmonic, Non-Linear Distortion, Distortion.
Harmonic sound energy unintentionally added by an electrical circuit or speaker. It is expressed as a percentage of the original signal. See THD.
Form of interference involving the generation of harmonics according to the frequency relationship f = nf1 for each frequency present, where n is a whole number equal to 2 or more.
The presence of harmonics in the output signal of a device which were not present in the input signal.
A harmonic is a sinusoidal component of a periodic wave having a frequency that is a multiple of the fundamental frequency. Harmonic distortion from lighting equipment can interfere with other appliances and the operation of electric power networks. The total harmonic distortion (THD) is usually expressed as a percentage of the fundamental line current. THD for 4-foot fluorescent ballasts usually range from 20% to 40%. For compact fluorescent ballasts, THD levels greater than 50% are not uncommon.
Total harmonic distortion is an expression of the total harmonic content of a voltage waveform. The harmonic distortion (or harmonic content) of a waveform is usually expressed as the square root of the sum of the squares of each of the harmonic amplitudes (with amplitudes as a percent of the fundamental voltage amplitude).
The presence of harmonics which change an AC waveform from sinusoidal to complex. This can cause overheating of circuit elements and might appear to a device as data corrupting noise.
The most common form of audio distortion, it shows up as additional unwanted signals at multiples of the original frequency. Thus, a l -kHz tone may have second-order harmonic distortion at 2 kHz, third-order at 3 kHz, etc. These can continue upward to beyond the seventh or eighth order. The percentage total of all these measurements is called total harmonic distortion (THD) and is commonly used in audio test reports. However, different components generate different ratios of odd and even orders, making some sound better than others-even though their THD measurements maybe the same.
Excessive harmonic content that distorts the normal sinusoidal wave form is harmonic distortion.
Distortion of an electrical sine wave caused by the power supplies of certain electronic devices. A mathematical representation of a distortion of a pure sine waveform.
The presence of harmonics that change the AC voltage waveform from a simple sinusoidal to complex waveform. Harmonic distortion can be generated by a load and fed back to the AC utility line, causing power problems to other equipment on the same circuit.
A measure of the degree to which the impedance of a UPS affects the shape of the output voltage waveform. Distortion is stated as a percentage and may refer to any single harmonic or to the total waveform, in which case it is referred to as "total harmonic distortion" (THD).
The generation of harmonics by the circuit or device by which the signal is processed.
Harmonic Distortion refers to the distortion of the sine wave.
A type of communications line interface that is caused by erroneous frequencies that are generated by non-linearities in the system.
The inadvertent addition of false harmonics to the signal passing through a device. Generally caused by the system not being perfectly linear.
An additional signal generated by the nonlinear characteristics of the transmission line which distorts the primary signal
The sum of all signals in an output which are multiples of the input signal frequencies ('harmonics') and not part of the input signal. Their intensities are expressed as a percentage of the total output intensity.
Distortion that is harmonic in nature, following the natural harmonics of the original signal. This is the least noxious form of distortion.
A wave form distortion, usually caused by the nonlinear frequency response of a transmission.
Interference resulting from some type of harmonic signal, measured in decibels (dB).