Slew-induced distortion
Encyclopedia
Slew-induced Distortion (SID, or sometimes: Slew-rate Induced Distortion) is caused when an amplifier or transducer is required to change output (or displacement), i.e. slew
, faster than it is able to do so without error. At such times any other signals may suffer considerable gain distortion, leading to Intermodulation distortion. Transient Intermodulation Distortion may involve some degree of SID and/or distortion
due to peak compression.
These are effects that tend to occur only during parts of a waveform
fed through audio
amplifier
s, that may give rise to audible degradation of the sound quality in music, even when fixed-frequency
harmonic distortion tests
show low amounts of distortion for a simple sinewave test signal.
Slew
*In electronics, the slew rate represents the maximum rate of change of a signal at any point in a circuit*In motion control, particularly with application to telescopes and spacecraft, slewing is the rotation of an object about an axis...
, faster than it is able to do so without error. At such times any other signals may suffer considerable gain distortion, leading to Intermodulation distortion. Transient Intermodulation Distortion may involve some degree of SID and/or distortion
Distortion
A distortion is the alteration of the original shape of an object, image, sound, waveform or other form of information or representation. Distortion is usually unwanted, and often many methods are employed to minimize it in practice...
due to peak compression.
These are effects that tend to occur only during parts of a waveform
Waveform
Waveform means the shape and form of a signal such as a wave moving in a physical medium or an abstract representation.In many cases the medium in which the wave is being propagated does not permit a direct visual image of the form. In these cases, the term 'waveform' refers to the shape of a graph...
fed through audio
Sound recording and reproduction
Sound recording and reproduction is an electrical or mechanical inscription and re-creation of sound waves, such as spoken voice, singing, instrumental music, or sound effects. The two main classes of sound recording technology are analog recording and digital recording...
amplifier
Amplifier
Generally, an amplifier or simply amp, is a device for increasing the power of a signal.In popular use, the term usually describes an electronic amplifier, in which the input "signal" is usually a voltage or a current. In audio applications, amplifiers drive the loudspeakers used in PA systems to...
s, that may give rise to audible degradation of the sound quality in music, even when fixed-frequency
Frequency
Frequency is the number of occurrences of a repeating event per unit time. It is also referred to as temporal frequency.The period is the duration of one cycle in a repeating event, so the period is the reciprocal of the frequency...
harmonic distortion tests
Audio system measurements
Audio system measurements are made for several purposes. Designers take measurements so that they can specify the performance of a piece of equipment. Maintenance engineers make them to ensure equipment is still working to specification, or to ensure that the cumulative defects of an audio path are...
show low amounts of distortion for a simple sinewave test signal.