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Attenuation Distortion

 

 
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Attenuation Distortion
 
 
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Attenuation distortion is the 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....
 of an analog signal
Analog signal

An analog or analogue signal is any continuous function Signal for which the time varying feature of the signal is a representation of some other time varying quantity, i.e analogous to another time varying signal....
 that occurs during transmission
Transmission (telecommunications)

In telecommunications, transmission is the process of sending, propagating and receiving an analogue or digital information signal over a physical point-to-point or point-to-multipoint transmission medium, either wired or wireless....
 when the transmission medium
Transmission medium

A transmission medium is a material substance which can wave propagation energy waves. For example, the transmission medium for sound received by the ears is usually air, but solids and liquids may also act as transmission media for sound....
 does not have a flat frequency response
Frequency response

Frequency response is the measure of any system's Frequency spectrum response at the output to a signal of varying frequency at its input. In the audible range it is usually referred to in connection with electronic amplifiers, microphones and loudspeakers....
 across the bandwidth of the medium or the frequency spectrum
Frequency spectrum

Familiar concepts associated with a frequency are colors, musical notes, radio/TV channels, and even the regular rotation of the earth. A source of light can have many colors mixed together and in different amounts ....
 of the signal.

Attenuation distortion occurs when some frequencies are attenuated more than other frequencies. When an analog signal of constant amplitude
Amplitude

Amplitude is the magnitude of change in the oscillating variable, with each oscillation, within an oscillating system. For instance, sound waves are oscillations in atmospheric pressure and their amplitudes are proportional to the change in pressure during one oscillation....
 across its frequency spectrum suffers attenuation distortion, some frequencies of the received signal arrive being greater in amplitude (louder), relative to other frequencies.

To overcome the effects of attenuation distortion, communications circuits have special equalization
Equalization

Equalization, equalisation or EQ is the process of using passive or active electronic elements or digital algorithms for the purpose of altering the frequency response characteristics of a system....
 equipment attached at the ends of the circuit or in between, designed to attenuate the signal evenly across the frequency spectrum, or to allow the signal to be received at equal amplitude for all frequencies.






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Encyclopedia


Attenuation distortion is the 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....
 of an analog signal
Analog signal

An analog or analogue signal is any continuous function Signal for which the time varying feature of the signal is a representation of some other time varying quantity, i.e analogous to another time varying signal....
 that occurs during transmission
Transmission (telecommunications)

In telecommunications, transmission is the process of sending, propagating and receiving an analogue or digital information signal over a physical point-to-point or point-to-multipoint transmission medium, either wired or wireless....
 when the transmission medium
Transmission medium

A transmission medium is a material substance which can wave propagation energy waves. For example, the transmission medium for sound received by the ears is usually air, but solids and liquids may also act as transmission media for sound....
 does not have a flat frequency response
Frequency response

Frequency response is the measure of any system's Frequency spectrum response at the output to a signal of varying frequency at its input. In the audible range it is usually referred to in connection with electronic amplifiers, microphones and loudspeakers....
 across the bandwidth of the medium or the frequency spectrum
Frequency spectrum

Familiar concepts associated with a frequency are colors, musical notes, radio/TV channels, and even the regular rotation of the earth. A source of light can have many colors mixed together and in different amounts ....
 of the signal.

Attenuation distortion occurs when some frequencies are attenuated more than other frequencies. When an analog signal of constant amplitude
Amplitude

Amplitude is the magnitude of change in the oscillating variable, with each oscillation, within an oscillating system. For instance, sound waves are oscillations in atmospheric pressure and their amplitudes are proportional to the change in pressure during one oscillation....
 across its frequency spectrum suffers attenuation distortion, some frequencies of the received signal arrive being greater in amplitude (louder), relative to other frequencies.

To overcome the effects of attenuation distortion, communications circuits have special equalization
Equalization

Equalization, equalisation or EQ is the process of using passive or active electronic elements or digital algorithms for the purpose of altering the frequency response characteristics of a system....
 equipment attached at the ends of the circuit or in between, designed to attenuate the signal evenly across the frequency spectrum, or to allow the signal to be received at equal amplitude for all frequencies. Attenuation distortion can still occur in a properly equipped circuit if this equalization filter
Equalization filter

An equalization filter is a filter , usually adjustable, chiefly meant to compensate for the unequal frequency response of some other signal processing circuit or system....
 is not properly maintained or adjusted.

In DSL circuits, echoes due to impedance mismatch often cause attenuation distortion so severe that some frequencies must be automatically mapped out and not used.