Smith,  Ernest J. <br/><br/>
Simplified filter design / 

 - New York :  RCA Institutes Technical Press,  1939. 
 - 57 p. :  ill. ;  28 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Electronic filters<br/>Signal processing<br/>Digital filters
<br/><br/><label>Dewey Class. No.: </label>621.384  / SMI