1. 
   sidetone
   (from the article `telephone`) Anti-sidetone circuit. The anti-sidetone circuit is an assemblage of transformers, resistors, and capacitors that perform a number of functions. The ...
   Found op http://www.britannica.com/eb/a-z/s/91
   
   
2. 
   Sidetone
   Sidetone is audible feedback to someone who is speaking. The term is most used in telecommunication contexts. ==Telephony== In telephony, sidetone is the effect of sound that is picked up by the telephone`s mouthpiece and in real-time introduced at a low level into the earpiece of the same handset,...
   Found op http://en.wikipedia.org/wiki/Sidetone
   
   
3. 
   sidetone
   the reproduction in the telephone receiver of sounds picked up by its associated transmitter and transmitted without appreciable delay by the internal circuitry of the telephone set
   Found op http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=722-15-21
   
   

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