Editing Loudspeaker (section)

===Digital speakers===
{{Main|Digital speaker}}

[[Digital speakers]] have been the subject of experiments performed by [[Bell Labs]] as far back as the 1920s.<ref>{{cite web |title=Speaker Exchange |date=April 11, 2010 |url=http://reconingspeakers.com/2010/04/digital-speakers/ |access-date=May 1, 2012 }}</ref> The design is simple; each [[bit]] controls a driver, which is either fully 'on' or 'off'. Problems with this design have led manufacturers to abandon it as impractical for the present. First, for a reasonable number of bits (required for adequate [[Sound recording and reproduction|sound reproduction]] quality), the physical size of a speaker system becomes very large. Secondly, due to inherent [[analog-to-digital conversion]] problems, the effect of [[aliasing]] is unavoidable, so that the audio output is ''reflected'' at equal amplitude in the frequency domain, on the other side of the [[Nyquist limit]] (half the sampling frequency), causing an unacceptably high level of [[Ultrasound|ultrasonics]] to accompany the desired output. No workable scheme has been found to adequately deal with this.