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<section id="audiospectrogram">
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<h1>AudioSpectrogram<a class="headerlink" href="#audiospectrogram" title="Link to this heading"></a></h1>
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<p>音频频谱（Audio Spectrogram）是一种常用的音频信号特征表示方式，通过将时域音频信号转换为频域信号，提供了时间和频率的双重信息。</p>
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<dl>
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<dt>参数说明：</dt><dd><ul class="simple">
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<li><p><strong>params</strong> - 频谱图参数配置结构体指针</p></li>
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<li><p><strong>workspace</strong> - 工作空间缓冲区结构体指针</p></li>
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<li><p><strong>core_mask</strong> - 核掩码，指定参与计算的处理器核（仅共享存储版本）</p></li>
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</ul>
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</dd>
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<dt><strong>结构体定义：</strong></dt><dd><div class="highlight-c notranslate"><div class="highlight"><pre><span></span><span class="linenos"> 1</span><span class="w"> </span><span class="k">typedef</span><span class="w"> </span><span class="k">struct</span><span class="w"> </span><span class="p">{</span>
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<span class="linenos"> 2</span><span class="w"> </span><span class="c1">// 输入</span>
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<span class="linenos"> 3</span><span class="w"> </span><span class="kt">float</span><span class="o">*</span><span class="w"> </span><span class="n">input</span><span class="p">;</span><span class="w"> </span><span class="c1">// 输入数据地址</span>
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<span class="linenos"> 4</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">input_len</span><span class="p">;</span><span class="w"> </span><span class="c1">// 输入数据长度</span>
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<span class="linenos"> 5</span>
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<span class="linenos"> 6</span><span class="w"> </span><span class="c1">// 输出</span>
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<span class="linenos"> 7</span><span class="w"> </span><span class="kt">float</span><span class="o">*</span><span class="w"> </span><span class="n">output</span><span class="p">;</span><span class="w"> </span><span class="c1">// 输出数据地址</span>
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<span class="linenos"> 8</span><span class="w"> </span><span class="kt">int</span><span class="o">*</span><span class="w"> </span><span class="n">output_shape</span><span class="p">;</span><span class="w"> </span><span class="c1">// 输出数据形状</span>
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<span class="linenos"> 9</span>
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<span class="linenos">10</span><span class="w"> </span><span class="c1">// 配置参数</span>
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<span class="linenos">11</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">pad</span><span class="p">;</span><span class="w"> </span><span class="c1">// 填充大小</span>
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<span class="linenos">12</span><span class="w"> </span><span class="n">WindowType</span><span class="w"> </span><span class="n">window_type</span><span class="p">;</span><span class="w"> </span><span class="c1">// 窗函数类型</span>
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<span class="linenos">13</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">n_fft</span><span class="p">;</span><span class="w"> </span><span class="c1">// FFT点数</span>
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<span class="linenos">14</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">hop_length</span><span class="p">;</span><span class="w"> </span><span class="c1">// 帧移长度</span>
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<span class="linenos">15</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">win_length</span><span class="p">;</span><span class="w"> </span><span class="c1">// 窗长度</span>
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<span class="linenos">16</span><span class="w"> </span><span class="kt">float</span><span class="w"> </span><span class="n">power</span><span class="p">;</span><span class="w"> </span><span class="c1">// 功率值</span>
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||
<span class="linenos">17</span><span class="w"> </span><span class="kt">bool</span><span class="w"> </span><span class="n">normalized</span><span class="p">;</span><span class="w"> </span><span class="c1">// 是否归一化</span>
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||
<span class="linenos">18</span><span class="w"> </span><span class="kt">bool</span><span class="w"> </span><span class="n">center</span><span class="p">;</span><span class="w"> </span><span class="c1">// 是否中心化</span>
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<span class="linenos">19</span><span class="w"> </span><span class="n">BorderType</span><span class="w"> </span><span class="n">pad_mode</span><span class="p">;</span><span class="w"> </span><span class="c1">// 填充模式</span>
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<span class="linenos">20</span><span class="w"> </span><span class="kt">bool</span><span class="w"> </span><span class="n">onesided</span><span class="p">;</span><span class="w"> </span><span class="c1">// 是否单边频谱</span>
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<span class="linenos">21</span><span class="w"> </span><span class="p">}</span><span class="w"> </span><span class="n">SpectrogramParam</span><span class="p">;</span>
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<span class="linenos">22</span><span class="w"> </span><span class="k">typedef</span><span class="w"> </span><span class="k">struct</span><span class="w"> </span><span class="p">{</span>
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<span class="linenos">23</span><span class="w"> </span><span class="kt">float</span><span class="o">*</span><span class="w"> </span><span class="n">fft_window</span><span class="p">;</span><span class="w"> </span><span class="c1">// FFT窗函数缓冲区</span>
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<span class="linenos">24</span><span class="w"> </span><span class="kt">float</span><span class="o">*</span><span class="w"> </span><span class="n">fft_window_later</span><span class="p">;</span><span class="w"> </span><span class="c1">// 后续FFT窗缓冲区</span>
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<span class="linenos">25</span><span class="w"> </span><span class="kt">float</span><span class="o">*</span><span class="w"> </span><span class="n">input_data_pad</span><span class="p">;</span><span class="w"> </span><span class="c1">// 填充后的输入数据</span>
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||
<span class="linenos">26</span><span class="w"> </span><span class="kt">float</span><span class="o">*</span><span class="w"> </span><span class="n">input_data</span><span class="p">;</span><span class="w"> </span><span class="c1">// 输入数据缓冲区</span>
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<span class="linenos">27</span><span class="w"> </span><span class="kt">float</span><span class="o">*</span><span class="w"> </span><span class="n">input_win</span><span class="p">;</span><span class="w"> </span><span class="c1">// 加窗输入数据</span>
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||
<span class="linenos">28</span><span class="w"> </span><span class="kt">float</span><span class="o">*</span><span class="w"> </span><span class="n">exp_complex</span><span class="p">;</span><span class="w"> </span><span class="c1">// 复数指数缓冲区</span>
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||
<span class="linenos">29</span><span class="w"> </span><span class="kt">float</span><span class="o">*</span><span class="w"> </span><span class="n">spec_f</span><span class="p">;</span><span class="w"> </span><span class="c1">// 频谱频率缓冲区</span>
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||
<span class="linenos">30</span><span class="w"> </span><span class="kt">float</span><span class="o">*</span><span class="w"> </span><span class="n">output_onsided</span><span class="p">;</span><span class="w"> </span><span class="c1">// 单边输出缓冲区</span>
|
||
<span class="linenos">31</span><span class="w"> </span><span class="p">}</span><span class="w"> </span><span class="n">WorkspaceParam</span><span class="p">;</span>
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||
</pre></div>
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</div>
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</dd>
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<dt>支持平台：</dt><dd><p><code class="docutils literal notranslate"><span class="pre">FT78NE</span></code>
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<code class="docutils literal notranslate"><span class="pre">MT7004</span></code></p>
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||
</dd>
|
||
</dl>
|
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<div class="admonition note">
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||
<p class="admonition-title">备注</p>
|
||
<ul class="simple">
|
||
<li><p>FT78NE 支持 fp32</p></li>
|
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<li><p>MT7004 支持 fp32</p></li>
|
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</ul>
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</div>
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<p><strong>共享存储版本：</strong></p>
|
||
<dl class="c function">
|
||
<dt class="sig sig-object c" id="c.fp_audio_spectrogram_s">
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||
<span class="kt"><span class="pre">void</span></span><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">fp_audio_spectrogram_s</span></span></span><span class="sig-paren">(</span><span class="n"><span class="pre">SpectrogramParam</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">params</span></span>, <span class="n"><span class="pre">WorkspaceParam</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">workspace</span></span>, <span class="kt"><span class="pre">int</span></span><span class="w"> </span><span class="n"><span class="pre">core_mask</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.fp_audio_spectrogram_s" title="Link to this definition"></a><br /></dt>
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<dd><p><strong>C调用示例：</strong></p>
|
||
<div class="highlight-c notranslate"><div class="highlight"><pre><span></span><span class="linenos"> 1</span><span class="c1">//FT78NE示例</span>
|
||
<span class="linenos"> 2</span><span class="cp">#include</span><span class="w"> </span><span class="cpf"><stdio.h></span>
|
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<span class="linenos"> 3</span>
|
||
<span class="linenos"> 4</span><span class="kt">int</span><span class="w"> </span><span class="nf">main</span><span class="p">(</span><span class="kt">int</span><span class="w"> </span><span class="n">argc</span><span class="p">,</span><span class="w"> </span><span class="kt">char</span><span class="o">*</span><span class="w"> </span><span class="n">argv</span><span class="p">[])</span><span class="w"> </span><span class="p">{</span>
|
||
<span class="linenos"> 5</span><span class="w"> </span><span class="kt">float</span><span class="o">*</span><span class="w"> </span><span class="n">input_data</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">(</span><span class="kt">float</span><span class="o">*</span><span class="p">)</span><span class="mh">0x81000000</span><span class="p">;</span>
|
||
<span class="linenos"> 6</span><span class="w"> </span><span class="kt">float</span><span class="o">*</span><span class="w"> </span><span class="n">output</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">(</span><span class="kt">float</span><span class="o">*</span><span class="p">)</span><span class="mh">0x82000000</span><span class="p">;</span>
|
||
<span class="linenos"> 7</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">output_shape</span><span class="p">[</span><span class="mi">2</span><span class="p">]</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">{</span><span class="mi">0</span><span class="p">,</span><span class="w"> </span><span class="mi">0</span><span class="p">,</span><span class="w"> </span><span class="mi">0</span><span class="p">};</span>
|
||
<span class="linenos"> 8</span><span class="w"> </span><span class="n">SpectrogramParam</span><span class="o">*</span><span class="w"> </span><span class="n">spec_params</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">(</span><span class="n">SpectrogramParam</span><span class="o">*</span><span class="p">)</span><span class="mh">0x83200000</span><span class="p">;</span>
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||
<span class="linenos"> 9</span><span class="w"> </span><span class="n">WorkspaceParam</span><span class="o">*</span><span class="w"> </span><span class="n">spec_workspace</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">(</span><span class="n">WorkspaceParam</span><span class="o">*</span><span class="p">)</span><span class="mh">0x83400000</span><span class="p">;</span>
|
||
<span class="linenos">10</span>
|
||
<span class="linenos">11</span><span class="w"> </span><span class="c1">// 结构体 SpectrogramParam</span>
|
||
<span class="linenos">12</span><span class="w"> </span><span class="n">spec_params</span><span class="o">-></span><span class="n">input</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">input_data</span><span class="p">;</span>
|
||
<span class="linenos">13</span><span class="w"> </span><span class="n">spec_params</span><span class="o">-></span><span class="n">input_len</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">4000</span><span class="p">;</span>
|
||
<span class="linenos">14</span><span class="w"> </span><span class="n">spec_params</span><span class="o">-></span><span class="n">output</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">output</span><span class="p">;</span>
|
||
<span class="linenos">15</span><span class="w"> </span><span class="n">spec_params</span><span class="o">-></span><span class="n">output_shape</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">output_shape</span><span class="p">;</span>
|
||
<span class="linenos">16</span><span class="w"> </span><span class="n">spec_params</span><span class="o">-></span><span class="n">pad</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">0</span><span class="p">;</span>
|
||
<span class="linenos">17</span><span class="w"> </span><span class="n">spec_params</span><span class="o">-></span><span class="n">window_type</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">kHann</span><span class="p">;</span>
|
||
<span class="linenos">18</span><span class="w"> </span><span class="n">spec_params</span><span class="o">-></span><span class="n">n_fft</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">32</span><span class="p">;</span>
|
||
<span class="linenos">19</span><span class="w"> </span><span class="n">spec_params</span><span class="o">-></span><span class="n">hop_length</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">16</span><span class="p">;</span>
|
||
<span class="linenos">20</span><span class="w"> </span><span class="n">spec_params</span><span class="o">-></span><span class="n">win_length</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">32</span><span class="p">;</span>
|
||
<span class="linenos">21</span><span class="w"> </span><span class="n">spec_params</span><span class="o">-></span><span class="n">power</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mf">2.0f</span><span class="p">;</span>
|
||
<span class="linenos">22</span><span class="w"> </span><span class="n">spec_params</span><span class="o">-></span><span class="n">normalized</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nb">false</span><span class="p">;</span>
|
||
<span class="linenos">23</span><span class="w"> </span><span class="n">spec_params</span><span class="o">-></span><span class="n">center</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nb">false</span><span class="p">;</span>
|
||
<span class="linenos">24</span><span class="w"> </span><span class="n">spec_params</span><span class="o">-></span><span class="n">pad_mode</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">kConstant</span><span class="p">;</span>
|
||
<span class="linenos">25</span><span class="w"> </span><span class="n">spec_params</span><span class="o">-></span><span class="n">onesided</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nb">true</span><span class="p">;</span>
|
||
<span class="linenos">26</span>
|
||
<span class="linenos">27</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">core_mask</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mh">0xff</span><span class="p">;</span>
|
||
<span class="linenos">28</span><span class="w"> </span><span class="c1">//spec_workspace里每个中间缓冲区指针分配地址</span>
|
||
<span class="linenos">29</span><span class="w"> </span><span class="c1">//...</span>
|
||
<span class="hll"><span class="linenos">30</span><span class="w"> </span><span class="n">fp_audio_spectrogram_s</span><span class="p">(</span><span class="n">spec_params</span><span class="p">,</span><span class="w"> </span><span class="n">spec_workspace</span><span class="p">,</span><span class="w"> </span><span class="n">core_mask</span><span class="p">);</span>
|
||
</span><span class="linenos">31</span><span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="mi">0</span><span class="p">;</span>
|
||
<span class="linenos">32</span><span class="p">}</span>
|
||
</pre></div>
|
||
</div>
|
||
</dd></dl>
|
||
|
||
<p><strong>私有存储版本:</strong></p>
|
||
<dl class="c function">
|
||
<dt class="sig sig-object c" id="c.fp_audio_spectrogram_p">
|
||
<span class="kt"><span class="pre">void</span></span><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">fp_audio_spectrogram_p</span></span></span><span class="sig-paren">(</span><span class="n"><span class="pre">SpectrogramParam</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">params</span></span>, <span class="n"><span class="pre">WorkspaceParam</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">workspace</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.fp_audio_spectrogram_p" title="Link to this definition"></a><br /></dt>
|
||
<dd><p><strong>C调用示例：</strong></p>
|
||
<div class="highlight-c notranslate"><div class="highlight"><pre><span></span><span class="linenos"> 1</span><span class="c1">//FT78NE示例</span>
|
||
<span class="linenos"> 2</span><span class="cp">#include</span><span class="w"> </span><span class="cpf"><stdio.h></span>
|
||
<span class="linenos"> 3</span>
|
||
<span class="linenos"> 4</span><span class="kt">int</span><span class="w"> </span><span class="nf">main</span><span class="p">(</span><span class="kt">int</span><span class="w"> </span><span class="n">argc</span><span class="p">,</span><span class="w"> </span><span class="kt">char</span><span class="o">*</span><span class="w"> </span><span class="n">argv</span><span class="p">[])</span><span class="w"> </span><span class="p">{</span>
|
||
<span class="linenos"> 5</span><span class="w"> </span><span class="kt">float</span><span class="o">*</span><span class="w"> </span><span class="n">input_data</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">(</span><span class="kt">float</span><span class="o">*</span><span class="p">)</span><span class="mh">0x10810000</span><span class="p">;</span>
|
||
<span class="linenos"> 6</span><span class="w"> </span><span class="kt">float</span><span class="o">*</span><span class="w"> </span><span class="n">output_mfcc</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">(</span><span class="kt">float</span><span class="o">*</span><span class="p">)</span><span class="mh">0x10820000</span><span class="p">;</span>
|
||
<span class="linenos"> 7</span><span class="w"> </span><span class="n">SpectrogramParam</span><span class="o">*</span><span class="w"> </span><span class="n">spec_params</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">(</span><span class="n">SpectrogramParam</span><span class="o">*</span><span class="p">)</span><span class="mh">0x10830000</span><span class="p">;</span>
|
||
<span class="linenos"> 8</span><span class="w"> </span><span class="n">WorkspaceParam</span><span class="o">*</span><span class="w"> </span><span class="n">spec_workspace</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">(</span><span class="n">WorkspaceParam</span><span class="o">*</span><span class="p">)</span><span class="mh">0x10840000</span><span class="p">;</span>
|
||
<span class="linenos"> 9</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">output_shape</span><span class="p">[</span><span class="mi">2</span><span class="p">]</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">{</span><span class="mi">0</span><span class="p">,</span><span class="w"> </span><span class="mi">0</span><span class="p">,</span><span class="w"> </span><span class="mi">0</span><span class="p">};</span>
|
||
<span class="linenos">10</span>
|
||
<span class="linenos">11</span><span class="w"> </span><span class="n">spec_params</span><span class="o">-></span><span class="n">input</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">input_data</span><span class="p">;</span>
|
||
<span class="linenos">12</span><span class="w"> </span><span class="n">spec_params</span><span class="o">-></span><span class="n">input_len</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">4000</span><span class="p">;</span>
|
||
<span class="linenos">13</span><span class="w"> </span><span class="n">spec_params</span><span class="o">-></span><span class="n">output</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">output</span><span class="p">;</span>
|
||
<span class="linenos">14</span><span class="w"> </span><span class="n">spec_params</span><span class="o">-></span><span class="n">output_shape</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">output_shape</span><span class="p">;</span>
|
||
<span class="linenos">15</span><span class="w"> </span><span class="n">spec_params</span><span class="o">-></span><span class="n">pad</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">0</span><span class="p">;</span>
|
||
<span class="linenos">16</span><span class="w"> </span><span class="n">spec_params</span><span class="o">-></span><span class="n">window_type</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">kHann</span><span class="p">;</span>
|
||
<span class="linenos">17</span><span class="w"> </span><span class="n">spec_params</span><span class="o">-></span><span class="n">n_fft</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">32</span><span class="p">;</span>
|
||
<span class="linenos">18</span><span class="w"> </span><span class="n">spec_params</span><span class="o">-></span><span class="n">hop_length</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">16</span><span class="p">;</span>
|
||
<span class="linenos">19</span><span class="w"> </span><span class="n">spec_params</span><span class="o">-></span><span class="n">win_length</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">32</span><span class="p">;</span>
|
||
<span class="linenos">20</span><span class="w"> </span><span class="n">spec_params</span><span class="o">-></span><span class="n">power</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mf">2.0f</span><span class="p">;</span>
|
||
<span class="linenos">21</span><span class="w"> </span><span class="n">spec_params</span><span class="o">-></span><span class="n">normalized</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nb">false</span><span class="p">;</span>
|
||
<span class="linenos">22</span><span class="w"> </span><span class="n">spec_params</span><span class="o">-></span><span class="n">center</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nb">false</span><span class="p">;</span>
|
||
<span class="linenos">23</span><span class="w"> </span><span class="n">spec_params</span><span class="o">-></span><span class="n">pad_mode</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">kConstant</span><span class="p">;</span>
|
||
<span class="linenos">24</span><span class="w"> </span><span class="n">spec_params</span><span class="o">-></span><span class="n">onesided</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nb">true</span><span class="p">;</span>
|
||
<span class="linenos">25</span>
|
||
<span class="linenos">26</span><span class="w"> </span><span class="c1">//为spec_workspace里每个中间缓冲区指针分配地址</span>
|
||
<span class="linenos">27</span><span class="w"> </span><span class="c1">//...</span>
|
||
<span class="linenos">28</span>
|
||
<span class="hll"><span class="linenos">29</span><span class="w"> </span><span class="n">fp_audio_spectrogram_p</span><span class="p">(</span><span class="n">spec_params</span><span class="p">,</span><span class="w"> </span><span class="n">spec_workspace</span><span class="p">);</span>
|
||
</span><span class="linenos">30</span><span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="mi">0</span><span class="p">;</span>
|
||
<span class="linenos">31</span><span class="p">}</span>
|
||
</pre></div>
|
||
</div>
|
||
</dd></dl>
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