In Mobile Audio, a line driver is a small amplifier used to bolster the strength of the audio signal coming from the source unit.
The newly strengthened signal is then fed to it's appropriate amplifier.
Gain on an amplifier needs to be set with regard to the input voltage the amplifier sees - the lower the input voltage, the greater the gain to produce a given loudness. When amplifying a very low-voltage signal, the noise-floor of the system raises, meaning that the amplifier is not only amplifying the low-voltage audio signal, but also the low-voltage noises picked up in the line along the way. By using a line driver, the amplifier's gains need not be set so high, thereby amplifying the audio signal with less of the low-level noise.
This can be useful especially in long runs of signal cable, which are more prone to picking up noise.
An unbalanced line is the type you have on the hi-fi, typically using an RCA connector, and feeding the signal through a coaxial cable.
The inner cable carries the signal, and the outer shield is a screen, to prevent RF interference and general airborne noise from being picked up on the signal lead.
The signal swing from the transmitter (across both wires) is double the voltage of the input signal.
In Mobile Audio, a linedriver is a small amplifier used to bolster the strength of the audio signal coming from the source unit.
Gain on an amplifier needs to be set with regard to the input voltage the amplifier sees - the lower the input voltage, the greater the gain to produce a given loudness.
By using a linedriver, the amplifier's gains need not be set so high, thereby amplifying the audio signal with less of the low-level noise.
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