Method (precision) for free-field calibration of one-inch standard condenser microphones by the reciprocity technique / 
British Standards Institution. 
 - 17 pages :  illustrations ;  33cm. 
 - British standard ;  BS 5679 : 1979 .
 - British standard ;  BS 5679 : 1979 .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Microphone--Calibration--Great Britain.<br/>Sound--Equipment and supplies.