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Lucas Cordiviola
2022-04-12 23:32:40 -03:00
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@@ -29,55 +29,55 @@ original version by: Nikos Drakos, CBLU, University of Leeds
<BODY >
<!--Navigation Panel-->
<A NAME="tex2html2533"
<A ID="tex2html2533"
HREF="node132.html">
<IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next"
SRC="next.png"></A>
<A NAME="tex2html2527"
<A ID="tex2html2527"
HREF="node128.html">
<IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up"
SRC="up.png"></A>
<A NAME="tex2html2523"
<A ID="tex2html2523"
HREF="node130.html">
<IMG WIDTH="63" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="previous"
SRC="prev.png"></A>
<A NAME="tex2html2529"
<A ID="tex2html2529"
HREF="node4.html">
<IMG WIDTH="65" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="contents"
SRC="contents.png"></A>
<A NAME="tex2html2531"
<A ID="tex2html2531"
HREF="node201.html">
<IMG WIDTH="43" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="index"
SRC="index.png"></A>
<BR>
<B> Next:</B> <A NAME="tex2html2534"
<B> Next:</B> <A ID="tex2html2534"
HREF="node132.html">Elementary filters</A>
<B> Up:</B> <A NAME="tex2html2528"
<B> Up:</B> <A ID="tex2html2528"
HREF="node128.html">Taxonomy of filters</A>
<B> Previous:</B> <A NAME="tex2html2524"
<B> Previous:</B> <A ID="tex2html2524"
HREF="node130.html">Band-pass and stop-band filters</A>
&nbsp; <B> <A NAME="tex2html2530"
&nbsp; <B> <A ID="tex2html2530"
HREF="node4.html">Contents</A></B>
&nbsp; <B> <A NAME="tex2html2532"
&nbsp; <B> <A ID="tex2html2532"
HREF="node201.html">Index</A></B>
<BR>
<BR>
<!--End of Navigation Panel-->
<H2><A NAME="SECTION001213000000000000000"></A>
<A NAME="sect8.equalizing"></A>
<H2><A ID="SECTION001213000000000000000"></A>
<A ID="sect8.equalizing"></A>
<BR>
Equalizing filters
</H2>
<P>
In some applications, such as
<A NAME="10107"></A><I>equalization</I>,
<A ID="10107"></A><I>equalization</I>,
the goal isn't to pass signals of certain frequencies while stopping others
altogether, but to make controllable adjustments, boosting or attenuating
a signal, over a frequency range, by a desired gain. Two filter types
are useful for this. First, a
<A NAME="10109"></A><A NAME="10110"></A><I>shelving filter</I>
<A ID="10109"></A><A ID="10110"></A><I>shelving filter</I>
(Figure <A HREF="#fig08.05">8.5</A>) is used for selectively boosting or reducing either the
low or high end of the frequency range. Below a selectable crossover frequency,
the filter tends toward a low-frequency gain, and above it it tends toward a
@@ -86,7 +86,7 @@ and high-frequency gain can all be adjusted independently.
<P>
<DIV ALIGN="CENTER"><A NAME="fig08.05"></A><A NAME="10115"></A>
<DIV ALIGN="CENTER"><A ID="fig08.05"></A><A ID="10115"></A>
<TABLE>
<CAPTION ALIGN="BOTTOM"><STRONG>Figure 8.5:</STRONG>
A shelving filter, showing low and high frequency gain, and
@@ -100,7 +100,7 @@ crossover frequency.</CAPTION>
<P>
Second, a
<A NAME="10118"></A><A NAME="10119"></A><I>peaking filter</I>
<A ID="10118"></A><A ID="10119"></A><I>peaking filter</I>
(Figure <A HREF="#fig08.06">8.6</A>) is capable of boosting or attenuating signals within
a range of frequencies. The center frequency and bandwidth (which together
control the range of frequencies affected), and the in-band and out-of-band
@@ -108,7 +108,7 @@ gains are separately adjustible.
<P>
<DIV ALIGN="CENTER"><A NAME="fig08.06"></A><A NAME="10124"></A>
<DIV ALIGN="CENTER"><A ID="fig08.06"></A><A ID="10124"></A>
<TABLE>
<CAPTION ALIGN="BOTTOM"><STRONG>Figure 8.6:</STRONG>
A peaking filter, with controllable center frequency, bandwidth,
@@ -128,36 +128,36 @@ adjust bands in between.
<P>
<HR>
<!--Navigation Panel-->
<A NAME="tex2html2533"
<A ID="tex2html2533"
HREF="node132.html">
<IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next"
SRC="next.png"></A>
<A NAME="tex2html2527"
<A ID="tex2html2527"
HREF="node128.html">
<IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up"
SRC="up.png"></A>
<A NAME="tex2html2523"
<A ID="tex2html2523"
HREF="node130.html">
<IMG WIDTH="63" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="previous"
SRC="prev.png"></A>
<A NAME="tex2html2529"
<A ID="tex2html2529"
HREF="node4.html">
<IMG WIDTH="65" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="contents"
SRC="contents.png"></A>
<A NAME="tex2html2531"
<A ID="tex2html2531"
HREF="node201.html">
<IMG WIDTH="43" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="index"
SRC="index.png"></A>
<BR>
<B> Next:</B> <A NAME="tex2html2534"
<B> Next:</B> <A ID="tex2html2534"
HREF="node132.html">Elementary filters</A>
<B> Up:</B> <A NAME="tex2html2528"
<B> Up:</B> <A ID="tex2html2528"
HREF="node128.html">Taxonomy of filters</A>
<B> Previous:</B> <A NAME="tex2html2524"
<B> Previous:</B> <A ID="tex2html2524"
HREF="node130.html">Band-pass and stop-band filters</A>
&nbsp; <B> <A NAME="tex2html2530"
&nbsp; <B> <A ID="tex2html2530"
HREF="node4.html">Contents</A></B>
&nbsp; <B> <A NAME="tex2html2532"
&nbsp; <B> <A ID="tex2html2532"
HREF="node201.html">Index</A></B>
<!--End of Navigation Panel-->
<ADDRESS>