Editing Amplitude modulation (section)

===Low-level generation===
In modern radio systems, modulated signals are generated via [[digital signal processing]] (DSP). With DSP many types of AM are possible with software control (including DSB with carrier, SSB suppressed-carrier and independent sideband, or ISB). Calculated digital samples are converted to voltages with a [[digital-to-analog converter]], typically at a frequency less than the desired RF-output frequency. The analog signal must then be shifted in frequency and [[linear amplifier|linearly amplified]] to the desired frequency and power level (linear amplification must be used to prevent modulation distortion).<ref>
{{cite book
|publisher= American Radio Relay League
|title= The ARRL Handbook for Radio Communications
|editor1-last= Silver |editor1-first= Ward
|edition= Eighty-eighth
|year= 2011
|chapter= Ch. 15 DSP and Software Radio Design
|isbn= 978-0-87259-096-0}}</ref>
This low-level method for AM is used in many Amateur Radio transceivers.<ref>{{cite book
|publisher= American Radio Relay League
|title= The ARRL Handbook for Radio Communications
|editor1-last= Silver |editor1-first= Ward
|edition= Eighty-eighth
|year= 2011
|chapter= Ch. 14 Transceivers
|isbn= 978-0-87259-096-0}}</ref>

AM may also be generated at a low level, using analog methods described in the next section.