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-<code class="code"><span class="keyword">let</span> signal_delay s1 s2 = <br>
- <span class="keyword">let</span> s1_mem = factory_add_memory (signal_fun s1) <br>
- (signal_macro_to_int <span class="constructor">Delay_Memory_Length_int</span>) <span class="keyword">in</span><br>
- <span class="keyword">let</span> new_signal = <span class="keyword">fun</span> t <span class="keywordsign">-></span> <br>
- <span class="keyword">let</span> delay = (signal_fun s2) t <span class="keyword">in</span><br>
- <span class="keyword">match</span> delay <span class="keyword">with</span><br>
- <span class="keywordsign">|</span><span class="constructor">N</span> i <span class="keywordsign">-></span> <span class="keyword">if</span> i < 0 <span class="keyword">then</span> raise (<span class="constructor">Signal_operation</span> <span class="string">"Delay time < 0."</span>) <br>
- <span class="keyword">else</span> <span class="keyword">if</span> (t - i) >= 0 <span class="keyword">then</span> s1_mem (t - i) <br>
- <span class="keyword">else</span> v_zero (s1_mem 0)<br>
- <span class="keywordsign">|</span><span class="constructor">R</span> f <span class="keywordsign">-></span> <span class="keyword">let</span> i = int_of_float f <span class="keyword">in</span><br>
- <span class="keyword">if</span> i < 0 <span class="keyword">then</span> raise (<span class="constructor">Signal_operation</span> <span class="string">"Delay time < 0."</span>) <br>
- <span class="keyword">else</span> <span class="keyword">if</span> (t - i) >= 0 <span class="keyword">then</span> s1_mem (t - i) <br>
- <span class="keyword">else</span> v_zero (s1_mem 0)<br>
- <span class="keywordsign">|</span><span class="constructor">Vec</span> (size, vec) <span class="keywordsign">-></span> raise (<span class="constructor">Signal_operation</span> <span class="string">"Delay time can not be a vector."</span>)<br>
- <span class="keywordsign">|</span><span class="constructor">Zero</span> <span class="keywordsign">-></span> s1_mem t<br>
- <span class="keywordsign">|</span><span class="constructor">W</span> <span class="keywordsign">-></span> raise (<span class="constructor">Signal_operation</span> <span class="string">"Delay time error."</span>)<br>
- <span class="keyword">in</span><br>
- (frequency s1, new_signal)</code></body></html>
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