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<para>Update the system gains from the loop bandwidth and damping factor. </para>
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<para>This function updates the system gains based on the loop bandwidth and damping factor of the system. These two factors can be set separately through their own set functions. </para>
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<para>Advance the control loop based on the current gain settings and the inputted error signal. </para>
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<para>Keep the phase between -2pi and 2pi. </para>
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<para>This function keeps the phase between -2pi and 2pi. If the phase is greater than 2pi by d, it wraps around to be -2pi+d; similarly if it is less than -2pi by d, it wraps around to 2pi-d.</para>
<para>This function should be called after advance_loop to keep the phase in a good operating region. It is set as a separate method in case another way is desired as this is fairly heavy-handed. </para>
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<para>Keep the frequency between d_min_freq and d_max_freq. </para>
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<para>This function keeps the frequency between d_min_freq and d_max_freq. If the frequency is greater than d_max_freq, it is set to d_max_freq. If the frequency is less than d_min_freq, it is set to d_min_freq.</para>
<para>This function should be called after advance_loop to keep the frequency in the specified region. It is set as a separate method in case another way is desired as this is fairly heavy-handed. </para>
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<para>Set the loop bandwidth. </para>
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<para>Set the loop filter&apos;s bandwidth to <computeroutput>bw</computeroutput>. This should be between 2*pi/200 and 2*pi/100 (in rads/samp). It must also be a positive number.</para>
<para>When a new damping factor is set, the gains, alpha and beta, of the loop are recalculated by a call to <ref refid="classgr_1_1blocks_1_1control__loop_1acb261d4921aae70126685b9bcb31c84f" kindref="member">update_gains()</ref>.</para>
<para><parameterlist kind="param"><parameteritem>
<parameternamelist>
<parametername>bw</parametername>
</parameternamelist>
<parameterdescription>
<para>(float) new bandwidth </para>
</parameterdescription>
</parameteritem>
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<para>Set the loop damping factor. </para>
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<para>Set the loop filter&apos;s damping factor to <computeroutput>df</computeroutput>. The damping factor should be sqrt(2)/2.0 for critically damped systems. Set it to anything else only if you know what you are doing. It must be a number between 0 and 1.</para>
<para>When a new damping factor is set, the gains, alpha and beta, of the loop are recalculated by a call to <ref refid="classgr_1_1blocks_1_1control__loop_1acb261d4921aae70126685b9bcb31c84f" kindref="member">update_gains()</ref>.</para>
<para><parameterlist kind="param"><parameteritem>
<parameternamelist>
<parametername>df</parametername>
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<para>(float) new damping factor </para>
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        <definition>void gr::blocks::control_loop::set_alpha</definition>
        <argsstring>(float alpha)</argsstring>
        <name>set_alpha</name>
        <qualifiedname>gr::blocks::control_loop::set_alpha</qualifiedname>
        <param>
          <type>float</type>
          <declname>alpha</declname>
        </param>
        <briefdescription>
<para>Set the loop gain alpha. </para>
        </briefdescription>
        <detaileddescription>
<para>Sets the loop filter&apos;s alpha gain parameter.</para>
<para>This value should really only be set by adjusting the loop bandwidth and damping factor.</para>
<para><parameterlist kind="param"><parameteritem>
<parameternamelist>
<parametername>alpha</parametername>
</parameternamelist>
<parameterdescription>
<para>(float) new alpha gain </para>
</parameterdescription>
</parameteritem>
</parameterlist>
</para>
        </detaileddescription>
        <inbodydescription>
        </inbodydescription>
        <location file="/pbulk/work/ham/gnuradio-doxygen/work/gnuradio-3.10.12.0/gr-blocks/include/gnuradio/blocks/control_loop.h" line="171" column="10"/>
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        <type>void</type>
        <definition>void gr::blocks::control_loop::set_beta</definition>
        <argsstring>(float beta)</argsstring>
        <name>set_beta</name>
        <qualifiedname>gr::blocks::control_loop::set_beta</qualifiedname>
        <param>
          <type>float</type>
          <declname>beta</declname>
        </param>
        <briefdescription>
<para>Set the loop gain beta. </para>
        </briefdescription>
        <detaileddescription>
<para>Sets the loop filter&apos;s beta gain parameter.</para>
<para>This value should really only be set by adjusting the loop bandwidth and damping factor.</para>
<para><parameterlist kind="param"><parameteritem>
<parameternamelist>
<parametername>beta</parametername>
</parameternamelist>
<parameterdescription>
<para>(float) new beta gain </para>
</parameterdescription>
</parameteritem>
</parameterlist>
</para>
        </detaileddescription>
        <inbodydescription>
        </inbodydescription>
        <location file="/pbulk/work/ham/gnuradio-doxygen/work/gnuradio-3.10.12.0/gr-blocks/include/gnuradio/blocks/control_loop.h" line="184" column="10"/>
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      <memberdef kind="function" id="classgr_1_1blocks_1_1control__loop_1a7739f1f594784e5757fa3f7aecf1de8b" prot="public" static="no" const="no" explicit="no" inline="no" virt="non-virtual">
        <type>void</type>
        <definition>void gr::blocks::control_loop::set_frequency</definition>
        <argsstring>(float freq)</argsstring>
        <name>set_frequency</name>
        <qualifiedname>gr::blocks::control_loop::set_frequency</qualifiedname>
        <param>
          <type>float</type>
          <declname>freq</declname>
        </param>
        <briefdescription>
<para>Set the control loop&apos;s frequency. </para>
        </briefdescription>
        <detaileddescription>
<para>Sets the control loop&apos;s frequency. While this is normally updated by the inner loop of the algorithm, it could be useful to manually initialize, set, or reset this under certain circumstances.</para>
<para><parameterlist kind="param"><parameteritem>
<parameternamelist>
<parametername>freq</parametername>
</parameternamelist>
<parameterdescription>
<para>(float) new frequency </para>
</parameterdescription>
</parameteritem>
</parameterlist>
</para>
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        </inbodydescription>
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        <type>void</type>
        <definition>void gr::blocks::control_loop::set_phase</definition>
        <argsstring>(float phase)</argsstring>
        <name>set_phase</name>
        <qualifiedname>gr::blocks::control_loop::set_phase</qualifiedname>
        <param>
          <type>float</type>
          <declname>phase</declname>
        </param>
        <briefdescription>
<para>Set the control loop&apos;s phase. </para>
        </briefdescription>
        <detaileddescription>
<para>Sets the control loop&apos;s phase. While this is normally updated by the inner loop of the algorithm, it could be useful to manually initialize, set, or reset this under certain circumstances.</para>
<para><parameterlist kind="param"><parameteritem>
<parameternamelist>
<parametername>phase</parametername>
</parameternamelist>
<parameterdescription>
<para>(float) new phase </para>
</parameterdescription>
</parameteritem>
</parameterlist>
</para>
        </detaileddescription>
        <inbodydescription>
        </inbodydescription>
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        <type>void</type>
        <definition>void gr::blocks::control_loop::set_max_freq</definition>
        <argsstring>(float freq)</argsstring>
        <name>set_max_freq</name>
        <qualifiedname>gr::blocks::control_loop::set_max_freq</qualifiedname>
        <param>
          <type>float</type>
          <declname>freq</declname>
        </param>
        <briefdescription>
<para>Set the control loop&apos;s maximum frequency. </para>
        </briefdescription>
        <detaileddescription>
<para>Set the maximum frequency the control loop can track.</para>
<para><parameterlist kind="param"><parameteritem>
<parameternamelist>
<parametername>freq</parametername>
</parameternamelist>
<parameterdescription>
<para>(float) new max frequency </para>
</parameterdescription>
</parameteritem>
</parameterlist>
</para>
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        </inbodydescription>
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        <type>void</type>
        <definition>void gr::blocks::control_loop::set_min_freq</definition>
        <argsstring>(float freq)</argsstring>
        <name>set_min_freq</name>
        <qualifiedname>gr::blocks::control_loop::set_min_freq</qualifiedname>
        <param>
          <type>float</type>
          <declname>freq</declname>
        </param>
        <briefdescription>
<para>Set the control loop&apos;s minimum frequency. </para>
        </briefdescription>
        <detaileddescription>
<para>Set the minimum frequency the control loop can track.</para>
<para><parameterlist kind="param"><parameteritem>
<parameternamelist>
<parametername>freq</parametername>
</parameternamelist>
<parameterdescription>
<para>(float) new min frequency </para>
</parameterdescription>
</parameteritem>
</parameterlist>
</para>
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        <type>float</type>
        <definition>float gr::blocks::control_loop::get_loop_bandwidth</definition>
        <argsstring>() const</argsstring>
        <name>get_loop_bandwidth</name>
        <qualifiedname>gr::blocks::control_loop::get_loop_bandwidth</qualifiedname>
        <briefdescription>
<para>Returns the loop bandwidth. </para>
        </briefdescription>
        <detaileddescription>
        </detaileddescription>
        <inbodydescription>
        </inbodydescription>
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        <type>float</type>
        <definition>float gr::blocks::control_loop::get_damping_factor</definition>
        <argsstring>() const</argsstring>
        <name>get_damping_factor</name>
        <qualifiedname>gr::blocks::control_loop::get_damping_factor</qualifiedname>
        <briefdescription>
<para>Returns the loop damping factor. </para>
        </briefdescription>
        <detaileddescription>
        </detaileddescription>
        <inbodydescription>
        </inbodydescription>
        <location file="/pbulk/work/ham/gnuradio-doxygen/work/gnuradio-3.10.12.0/gr-blocks/include/gnuradio/blocks/control_loop.h" line="244" column="11"/>
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        <type>float</type>
        <definition>float gr::blocks::control_loop::get_alpha</definition>
        <argsstring>() const</argsstring>
        <name>get_alpha</name>
        <qualifiedname>gr::blocks::control_loop::get_alpha</qualifiedname>
        <briefdescription>
<para>Returns the loop gain alpha. </para>
        </briefdescription>
        <detaileddescription>
        </detaileddescription>
        <inbodydescription>
        </inbodydescription>
        <location file="/pbulk/work/ham/gnuradio-doxygen/work/gnuradio-3.10.12.0/gr-blocks/include/gnuradio/blocks/control_loop.h" line="249" column="11"/>
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        <type>float</type>
        <definition>float gr::blocks::control_loop::get_beta</definition>
        <argsstring>() const</argsstring>
        <name>get_beta</name>
        <qualifiedname>gr::blocks::control_loop::get_beta</qualifiedname>
        <briefdescription>
<para>Returns the loop gain beta. </para>
        </briefdescription>
        <detaileddescription>
        </detaileddescription>
        <inbodydescription>
        </inbodydescription>
        <location file="/pbulk/work/ham/gnuradio-doxygen/work/gnuradio-3.10.12.0/gr-blocks/include/gnuradio/blocks/control_loop.h" line="254" column="11"/>
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      <memberdef kind="function" id="classgr_1_1blocks_1_1control__loop_1a54b262246cef1895167549a6ceb82fff" prot="public" static="no" const="yes" explicit="no" inline="no" virt="non-virtual">
        <type>float</type>
        <definition>float gr::blocks::control_loop::get_frequency</definition>
        <argsstring>() const</argsstring>
        <name>get_frequency</name>
        <qualifiedname>gr::blocks::control_loop::get_frequency</qualifiedname>
        <briefdescription>
<para>Get the control loop&apos;s frequency estimate. </para>
        </briefdescription>
        <detaileddescription>
        </detaileddescription>
        <inbodydescription>
        </inbodydescription>
        <location file="/pbulk/work/ham/gnuradio-doxygen/work/gnuradio-3.10.12.0/gr-blocks/include/gnuradio/blocks/control_loop.h" line="259" column="11"/>
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        <type>float</type>
        <definition>float gr::blocks::control_loop::get_phase</definition>
        <argsstring>() const</argsstring>
        <name>get_phase</name>
        <qualifiedname>gr::blocks::control_loop::get_phase</qualifiedname>
        <briefdescription>
<para>Get the control loop&apos;s phase estimate. </para>
        </briefdescription>
        <detaileddescription>
        </detaileddescription>
        <inbodydescription>
        </inbodydescription>
        <location file="/pbulk/work/ham/gnuradio-doxygen/work/gnuradio-3.10.12.0/gr-blocks/include/gnuradio/blocks/control_loop.h" line="264" column="11"/>
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        <type>float</type>
        <definition>float gr::blocks::control_loop::get_max_freq</definition>
        <argsstring>() const</argsstring>
        <name>get_max_freq</name>
        <qualifiedname>gr::blocks::control_loop::get_max_freq</qualifiedname>
        <briefdescription>
<para>Get the control loop&apos;s maximum frequency. </para>
        </briefdescription>
        <detaileddescription>
        </detaileddescription>
        <inbodydescription>
        </inbodydescription>
        <location file="/pbulk/work/ham/gnuradio-doxygen/work/gnuradio-3.10.12.0/gr-blocks/include/gnuradio/blocks/control_loop.h" line="269" column="11"/>
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      <memberdef kind="function" id="classgr_1_1blocks_1_1control__loop_1a2a60887a2e9f76651c34ba34f30313fa" prot="public" static="no" const="yes" explicit="no" inline="no" virt="non-virtual">
        <type>float</type>
        <definition>float gr::blocks::control_loop::get_min_freq</definition>
        <argsstring>() const</argsstring>
        <name>get_min_freq</name>
        <qualifiedname>gr::blocks::control_loop::get_min_freq</qualifiedname>
        <briefdescription>
<para>Get the control loop&apos;s minimum frequency. </para>
        </briefdescription>
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    <briefdescription>
<para>A second-order control loop implementation class. </para>
    </briefdescription>
    <detaileddescription>
<para>This class implements a second order control loop and is intended to act as a parent class to blocks which need a control loop (e.g., <ref refid="classgr_1_1digital_1_1costas__loop__cc" kindref="compound">gr::digital::costas_loop_cc</ref>, <ref refid="classgr_1_1analog_1_1pll__refout__cc" kindref="compound">gr::analog::pll_refout_cc</ref>, etc.). It takes in a loop bandwidth as well as a max and min frequency and provides the functions that control the update of the loop.</para>
<para>The loop works of alpha and beta gains. These gains are calculated using the input loop bandwidth and a pre-set damping factor. The damping factor can be changed using the <ref refid="classgr_1_1blocks_1_1control__loop_1abb3497f1bbae1f1835808e80e8d5d24f" kindref="member">set_damping_factor</ref> after the block is constructed. The alpha and beta values can be set using their respective <ref refid="classgr_1_1blocks_1_1control__loop_1a96941dd371da64d83e3c3f8eab7bfc8a" kindref="member">set_alpha</ref> or <ref refid="classgr_1_1blocks_1_1control__loop_1a1bb58989ff0c57cf2cc90d0804788f6f" kindref="member">set_beta</ref> functions if very precise control over these is required.</para>
<para>The class tracks both phase and frequency of a signal based on an error signal. The error calculation is unique for each algorithm and is calculated externally and passed to the advance_loop function, which uses this to update its phase and frequency estimates.</para>
<para>This class also provides the functions <ref refid="classgr_1_1blocks_1_1control__loop_1a410bd28032522a9ea3357e1760b8846b" kindref="member">phase_wrap</ref> and <ref refid="classgr_1_1blocks_1_1control__loop_1a31b65cd76562c7ba387ceee475d3b102" kindref="member">frequency_limit</ref> to easily keep the phase and frequency estimates within our set bounds (phase_wrap keeps it within +/-2pi). </para>
    </detaileddescription>
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        <label>gr::analog::pll_carriertracking_cc</label>
        <link refid="classgr_1_1analog_1_1pll__carriertracking__cc"/>
        <childnode refid="1" relation="public-inheritance">
        </childnode>
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        <label>gr::analog::pll_freqdet_cf</label>
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        <label>gr::analog::pll_refout_cc</label>
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        <childnode refid="1" relation="public-inheritance">
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        <childnode refid="1" relation="public-inheritance">
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        <label>gr::digital::fll_band_edge_cc</label>
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    </listofallmembers>
  </compounddef>
</doxygen>
