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<p>Apply Cepstral Mean Normalization (CMN) to the set of input mfc frames.
<a href="#details">More...</a></p>
<div class="textblock"><code>#include <sphinxbase/sphinxbase_export.h></code><br />
<code>#include <<a class="el" href="prim__type_8h_source.html">sphinxbase/prim_type.h</a>></code><br />
<code>#include <sphinxbase/fe.h></code><br />
</div>
<p><a href="cmn_8h_source.html">Go to the source code of this file.</a></p>
<table class="memberdecls">
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Data Structures</h2></td></tr>
<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="structcmn__t.html">cmn_t</a></td></tr>
<tr class="memdesc:"><td class="mdescLeft"> </td><td class="mdescRight">wrapper of operation of the cepstral mean normalization. <a href="structcmn__t.html#details">More...</a><br /></td></tr>
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Macros</h2></td></tr>
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#define </td><td class="memItemRight" valign="bottom"><b>CMN_WIN_HWM</b>   800 /* #frames after which window shifted */</td></tr>
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<tr class="memitem:a500dafed8351d334da9290ec4f3f6ab3"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a500dafed8351d334da9290ec4f3f6ab3"></a>
#define </td><td class="memItemRight" valign="bottom"><b>CMN_WIN</b>   500</td></tr>
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Typedefs</h2></td></tr>
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typedef enum <a class="el" href="cmn_8h.html#a5bb134416e9e63a317eac20b0102bd59">cmn_type_e</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="cmn_8h.html#a9384c411b10e9db9745cfb550a5c7652">cmn_type_t</a></td></tr>
<tr class="memdesc:a9384c411b10e9db9745cfb550a5c7652"><td class="mdescLeft"> </td><td class="mdescRight">Types of cepstral mean normalization to apply to the features. <br /></td></tr>
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Enumerations</h2></td></tr>
<tr class="memitem:a5bb134416e9e63a317eac20b0102bd59"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a5bb134416e9e63a317eac20b0102bd59"></a>enum  </td><td class="memItemRight" valign="bottom"><a class="el" href="cmn_8h.html#a5bb134416e9e63a317eac20b0102bd59">cmn_type_e</a> { <b>CMN_NONE</b> = 0,
<b>CMN_CURRENT</b>,
<b>CMN_PRIOR</b>
}</td></tr>
<tr class="memdesc:a5bb134416e9e63a317eac20b0102bd59"><td class="mdescLeft"> </td><td class="mdescRight">Types of cepstral mean normalization to apply to the features. <br /></td></tr>
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Functions</h2></td></tr>
<tr class="memitem:acf5e65a03a0d74630add4a400fed0ce8"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="acf5e65a03a0d74630add4a400fed0ce8"></a>
SPHINXBASE_EXPORT <a class="el" href="cmn_8h.html#a9384c411b10e9db9745cfb550a5c7652">cmn_type_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="cmn_8h.html#acf5e65a03a0d74630add4a400fed0ce8">cmn_type_from_str</a> (const char *str)</td></tr>
<tr class="memdesc:acf5e65a03a0d74630add4a400fed0ce8"><td class="mdescLeft"> </td><td class="mdescRight">Convert string representation (from command-line) to cmn_type_t. <br /></td></tr>
<tr class="separator:acf5e65a03a0d74630add4a400fed0ce8"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a7ba6ce5489afce232b9bb61bd2ebd20f"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a7ba6ce5489afce232b9bb61bd2ebd20f"></a>
SPHINXBASE_EXPORT <a class="el" href="structcmn__t.html">cmn_t</a> * </td><td class="memItemRight" valign="bottom"><b>cmn_init</b> (int32 veclen)</td></tr>
<tr class="separator:a7ba6ce5489afce232b9bb61bd2ebd20f"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:accf10de8ef4d98b4bf591529cf16565e"><td class="memItemLeft" align="right" valign="top">SPHINXBASE_EXPORT void </td><td class="memItemRight" valign="bottom"><a class="el" href="cmn_8h.html#accf10de8ef4d98b4bf591529cf16565e">cmn</a> (<a class="el" href="structcmn__t.html">cmn_t</a> *cmn, mfcc_t **mfc, int32 varnorm, int32 n_frame)</td></tr>
<tr class="memdesc:accf10de8ef4d98b4bf591529cf16565e"><td class="mdescLeft"> </td><td class="mdescRight">CMN for the whole sentence. <a href="#accf10de8ef4d98b4bf591529cf16565e">More...</a><br /></td></tr>
<tr class="separator:accf10de8ef4d98b4bf591529cf16565e"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:aa622cf1b6a1b9a9bffd8f60b903bfc42"><td class="memItemLeft" align="right" valign="top">SPHINXBASE_EXPORT void </td><td class="memItemRight" valign="bottom"><a class="el" href="cmn_8h.html#aa622cf1b6a1b9a9bffd8f60b903bfc42">cmn_prior</a> (<a class="el" href="structcmn__t.html">cmn_t</a> *<a class="el" href="cmn_8h.html#accf10de8ef4d98b4bf591529cf16565e">cmn</a>, mfcc_t **incep, int32 varnorm, int32 nfr)</td></tr>
<tr class="memdesc:aa622cf1b6a1b9a9bffd8f60b903bfc42"><td class="mdescLeft"> </td><td class="mdescRight">CMN for one block of data, using prior mean. <a href="#aa622cf1b6a1b9a9bffd8f60b903bfc42">More...</a><br /></td></tr>
<tr class="separator:aa622cf1b6a1b9a9bffd8f60b903bfc42"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:aae61df2ec71082520669fc63d94bb1ef"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="aae61df2ec71082520669fc63d94bb1ef"></a>
SPHINXBASE_EXPORT void </td><td class="memItemRight" valign="bottom"><a class="el" href="cmn_8h.html#aae61df2ec71082520669fc63d94bb1ef">cmn_prior_update</a> (<a class="el" href="structcmn__t.html">cmn_t</a> *<a class="el" href="cmn_8h.html#accf10de8ef4d98b4bf591529cf16565e">cmn</a>)</td></tr>
<tr class="memdesc:aae61df2ec71082520669fc63d94bb1ef"><td class="mdescLeft"> </td><td class="mdescRight">Update prior mean based on observed data. <br /></td></tr>
<tr class="separator:aae61df2ec71082520669fc63d94bb1ef"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a0f6f70d51143d6a33130650b8d4758ab"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a0f6f70d51143d6a33130650b8d4758ab"></a>
SPHINXBASE_EXPORT void </td><td class="memItemRight" valign="bottom"><a class="el" href="cmn_8h.html#a0f6f70d51143d6a33130650b8d4758ab">cmn_prior_set</a> (<a class="el" href="structcmn__t.html">cmn_t</a> *<a class="el" href="cmn_8h.html#accf10de8ef4d98b4bf591529cf16565e">cmn</a>, mfcc_t const *vec)</td></tr>
<tr class="memdesc:a0f6f70d51143d6a33130650b8d4758ab"><td class="mdescLeft"> </td><td class="mdescRight">Set the prior mean. <br /></td></tr>
<tr class="separator:a0f6f70d51143d6a33130650b8d4758ab"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a4f624f5b805288f66fa05b79b1e4f383"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a4f624f5b805288f66fa05b79b1e4f383"></a>
SPHINXBASE_EXPORT void </td><td class="memItemRight" valign="bottom"><a class="el" href="cmn_8h.html#a4f624f5b805288f66fa05b79b1e4f383">cmn_prior_get</a> (<a class="el" href="structcmn__t.html">cmn_t</a> *<a class="el" href="cmn_8h.html#accf10de8ef4d98b4bf591529cf16565e">cmn</a>, mfcc_t *vec)</td></tr>
<tr class="memdesc:a4f624f5b805288f66fa05b79b1e4f383"><td class="mdescLeft"> </td><td class="mdescRight">Get the prior mean. <br /></td></tr>
<tr class="separator:a4f624f5b805288f66fa05b79b1e4f383"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a0f70f378107e3d4e861e39d4f76d8d50"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a0f70f378107e3d4e861e39d4f76d8d50"></a>
SPHINXBASE_EXPORT void </td><td class="memItemRight" valign="bottom"><b>cmn_free</b> (<a class="el" href="structcmn__t.html">cmn_t</a> *<a class="el" href="cmn_8h.html#accf10de8ef4d98b4bf591529cf16565e">cmn</a>)</td></tr>
<tr class="separator:a0f70f378107e3d4e861e39d4f76d8d50"><td class="memSeparator" colspan="2"> </td></tr>
</table><table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="var-members"></a>
Variables</h2></td></tr>
<tr class="memitem:ae2ab0bad7168386076c43fc2a421867f"><td class="memItemLeft" align="right" valign="top">SPHINXBASE_EXPORT const char * </td><td class="memItemRight" valign="bottom"><a class="el" href="cmn_8h.html#ae2ab0bad7168386076c43fc2a421867f">cmn_type_str</a> []</td></tr>
<tr class="memdesc:ae2ab0bad7168386076c43fc2a421867f"><td class="mdescLeft"> </td><td class="mdescRight">String representations of cmn_type_t values. <a href="#ae2ab0bad7168386076c43fc2a421867f">More...</a><br /></td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><p>Apply Cepstral Mean Normalization (CMN) to the set of input mfc frames. </p>
<p>By subtractingthe mean of the input from each frame. C0 is also included in this process. This function operates on an entire utterance at a time. Hence, the entire utterance must be available beforehand (batchmode). </p>
<p>Definition in file <a class="el" href="cmn_8h_source.html">cmn.h</a>.</p>
</div><h2 class="groupheader">Function Documentation</h2>
<a class="anchor" id="accf10de8ef4d98b4bf591529cf16565e"></a>
<div class="memitem">
<div class="memproto">
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<td class="memname">SPHINXBASE_EXPORT void cmn </td>
<td>(</td>
<td class="paramtype"><a class="el" href="structcmn__t.html">cmn_t</a> * </td>
<td class="paramname"><em>cmn</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">mfcc_t ** </td>
<td class="paramname"><em>mfc</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int32 </td>
<td class="paramname"><em>varnorm</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int32 </td>
<td class="paramname"><em>n_frame</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
</table>
</div><div class="memdoc">
<p>CMN for the whole sentence. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">cmn</td><td>In/Out: cmn normalization, which contains the cmn_mean and cmn_var) </td></tr>
<tr><td class="paramname">mfc</td><td>In/Out: mfc[f] = mfc vector in frame f </td></tr>
<tr><td class="paramname">varnorm</td><td>In: if not FALSE, variance normalize the input vectors to have unit variance (along each dimension independently); Irrelevant if no cmn is performed </td></tr>
<tr><td class="paramname">n_frame</td><td>In: Number of frames of mfc vectors </td></tr>
</table>
</dd>
</dl>
<p>Definition at line <a class="el" href="cmn_8c_source.html#l00150">150</a> of file <a class="el" href="cmn_8c_source.html">cmn.c</a>.</p>
<p>References <a class="el" href="cmn_8h_source.html#l00129">cmn_t::cmn_mean</a>, <a class="el" href="cmn_8h_source.html#l00130">cmn_t::cmn_var</a>, <a class="el" href="err_8h_source.html#l00147">E_INFO</a>, <a class="el" href="err_8h_source.html#l00153">E_INFOCONT</a>, and <a class="el" href="cmn_8h_source.html#l00133">cmn_t::veclen</a>.</p>
<p>Referenced by <a class="el" href="feat_8c_source.html#l00705">feat_init()</a>.</p>
</div>
</div>
<a class="anchor" id="aa622cf1b6a1b9a9bffd8f60b903bfc42"></a>
<div class="memitem">
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<td class="memname">SPHINXBASE_EXPORT void cmn_prior </td>
<td>(</td>
<td class="paramtype"><a class="el" href="structcmn__t.html">cmn_t</a> * </td>
<td class="paramname"><em>cmn</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">mfcc_t ** </td>
<td class="paramname"><em>incep</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int32 </td>
<td class="paramname"><em>varnorm</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int32 </td>
<td class="paramname"><em>nfr</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
</table>
</div><div class="memdoc">
<p>CMN for one block of data, using prior mean. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">cmn</td><td>In/Out: cmn normalization, which contains the cmn_mean and cmn_var) </td></tr>
<tr><td class="paramname">incep</td><td>In/Out: mfc[f] = mfc vector in frame f </td></tr>
<tr><td class="paramname">varnorm</td><td>This flag should always be 0 for live </td></tr>
<tr><td class="paramname">nfr</td><td>Number of incoming frames </td></tr>
</table>
</dd>
</dl>
<p>Definition at line <a class="el" href="cmn__prior_8c_source.html#l00146">146</a> of file <a class="el" href="cmn__prior_8c_source.html">cmn_prior.c</a>.</p>
<p>References <a class="el" href="cmn_8h_source.html#l00129">cmn_t::cmn_mean</a>, <a class="el" href="err_8h_source.html#l00127">E_FATAL</a>, <a class="el" href="cmn_8h_source.html#l00132">cmn_t::nframe</a>, <a class="el" href="cmn_8h_source.html#l00131">cmn_t::sum</a>, and <a class="el" href="cmn_8h_source.html#l00133">cmn_t::veclen</a>.</p>
</div>
</div>
<h2 class="groupheader">Variable Documentation</h2>
<a class="anchor" id="ae2ab0bad7168386076c43fc2a421867f"></a>
<div class="memitem">
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<td class="memname">SPHINXBASE_EXPORT const char* cmn_type_str[]</td>
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</div><div class="memdoc">
<p>String representations of cmn_type_t values. </p>
<p>Definition at line <a class="el" href="cmn_8c_source.html#l00110">110</a> of file <a class="el" href="cmn_8c_source.html">cmn.c</a>.</p>
<p>Referenced by <a class="el" href="cmn_8c_source.html#l00118">cmn_type_from_str()</a>, and <a class="el" href="feat_8c_source.html#l00705">feat_init()</a>.</p>
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