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... ! <br /> ! <br /> .. <br /> .. <br /> ,..,. <br /> ... <br /> represent a true sound pressure level because some of the sound has been <br /> 1 <br /> filtered out . <br /> i <br /> 1 <br /> .. I <br /> 10 I <br /> ,,..• <br /> 11111111111111111MAIII <br /> ,.. <br /> . ... <br /> . El1111111111 <br /> . cot) -10 imin <br /> ill <br /> . W <br /> , Cc <br /> 111 IIIIIIIII <br /> , 1.1-30 illimill <br /> II 111 III <br /> .., <br /> .., <br /> : Cc <br /> r21-450 1111WA011111111111111_1, 11111 <br /> 10 2 5 100 Z 5 1000 2 5 10,000 <br /> FREQUENCY (Hz) 1 410 <br /> 1 <br /> 1 <br /> FIG. 4. SOUND FILTERING AT A-SCALE SETTING ON SOUND LEVEL METER. <br /> 1 <br /> 1 <br /> ! <br /> I <br /> 1 <br /> . 1 <br /> i <br /> 1 <br /> ! <br /> 1 <br /> ! <br /> 1 <br /> I <br /> i <br /> i <br /> 1 <br /> i <br /> i <br /> 0 <br /> 13 <br /> i <br /> .. . <br /> , <br /> ......— <br />