Differences

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--- ezfit:db_spl_hl_conversion [2009/08/20 09:38]
smayr
+++ ezfit:db_spl_hl_conversion [2010/09/09 15:09] (current)
ajdavis
@@ Line 1: / Line 1: @@
 ==dB SPL/HL Conversion==
+<charter>
+title = dB HL vs. dB SPL
+size = 800x330
+align = center
+bgcolor = #ffffff
+type = line
+dots = 3
+XAxisName = Frequency (Hz)
+YAxisName = Sound Level (dB)
+legendEntries = Hearing Level (HL), Sound Pressure Level (SPL) Free Field
+labelSerie = 3
+, 9, 3, -3, -4, 8
+, 0, 0, 0, 0, 0
+, 500, 1000, 2000, 4000, 8000
+</charter>
 The calculation is based on the frequency the measurement was taken at.
-^ Frequency (Hz) ^ dB SPL ^ dB HL ^
+^ Frequency (Hz) ^ dB HL ^ dB SPL FF ^
-| 250       |      15|    0 |
+| 250       |          0 |  15|
-| 500       |       9|    0 |
+| 500       |          0 |   9|
-| 1000      |       3|    0 |
+| 1000      |          0 |   3|
-| 2000      |      -3|    0 |
+| 2000      |          0 |  -3|
-| 4000      |      -4|    0 |
+| 4000      |          0 |  -4|
-| 8000      |       8|    0 |
+| 8000      |          0 |   8|
-SPL = Sound Pressure Level
+SPL = Sound Pressure Level Free Field
 HL = Hearing Level
-HL is used for Audiogram representation.  SPL is used for Target Curves representation.
-**Audiogram using HL. **
+HL is used for Audiogram representation.  SPL is used for Target Curves representation. The HL chart has the Y-axis origin at the top left corner.  The SPL chart has the Y-axis origin at the bottom left corner.
-Source: Wikipedia, http://en.wikipedia.org/wiki/File:Audio23.jpg
+== Examples ==
+=== Audiogram dB HL vs. dB SPL ===
+{{:ezfit:ezfit-audiogram-dbhl-vs-dbspl.jpg|Audiogram using dB HL vs. dB SPL}}
+=== Audiogram using HL ==
 {{:ezfit:audiogram-sample.jpg|Audiogram using HL. Source: Wikipedia, http://en.wikipedia.org/wiki/File:Audio23.jpg}}
+Source: Wikipedia, http://en.wikipedia.org/wiki/File:Audio23.jpg
+=== Target Curves using SPL ===
+{{:ezfit:ezfit-targetcurves.jpg|Sample Target Curves (thick dotted lines) and related Response Curves (thin continuous lines)}}
+Source: ezFIT software