Editing Delta modulation (section)

=== Inability to transmit DC ===
Because the modulated signal contains only the derivative of the input, any [[DC bias|DC]] and low-frequency content of the signal is lost (which may be ok for voice and other applications which do not have low frequencies), transmission errors are accumulated, and high-frequency noise is amplified. An improvement to DM called [[delta-sigma modulation]] avoids these downsides by rearranging the integrator's position so that the modulated signal represents the amplitude of the input signal instead of just its derivative.<ref name=":5" /><ref name=":2" />