Gregg, William David. <br/><br/>
Analog and digital communication :  concepts, systems, applications, and services in electrical dissimination of aural, visual and data information / 
W. David Gregg. 
 - New York :  Wiley,  c1977. 
 - xix, 603 p. :  ill. 
<br/><br/><label>ISBN: </label>0471326615 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Telecommunication.