{"id":5731,"date":"2021-05-20T21:28:21","date_gmt":"2021-05-20T12:28:21","guid":{"rendered":"https:\/\/kats-eye.net\/info\/?p=5731"},"modified":"2021-05-22T09:36:17","modified_gmt":"2021-05-22T00:36:17","slug":"raspy-snd-anal","status":"publish","type":"post","link":"https:\/\/kats-eye.net\/info\/2021\/05\/20\/raspy-snd-anal\/","title":{"rendered":"\u30e9\u30ba\u30d1\u30a4\uff14  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\u306a\u3069\u3001\u69d8\u3005\u306a\u97f3\u58f0\u306f\u305d\u308c\u305e\u308c\u7279\u6709\u306e\u5468\u6ce2\u6570\u6210\u5206\u3067\u69cb\u6210\u3055\u308c\u3066\u3044\u3066\u3001\u5468\u6ce2\u6570\u6210\u5206\u5206\u6790\u306b\u3088\u308a\u3001\u7279\u5b9a\u97f3\u58f0\u306e\u691c\u51fa\u306b\u5229\u7528\u3067\u304d\u308b\u3068\u7406\u89e3\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<h2>\u7d50\u679c\uff08\u30b0\u30e9\u30d5\u51fa\u529b\uff09<\/h2>\n\n\n\n<p>\u3000\u6b21\u52d5\u753b\u306f\u3001\u4eca\u56de\u4f5c\u6210\u3057\u305f\u30d7\u30ed\u30b0\u30e9\u30e0\u51fa\u529b\u72b6\u6cc1\u3067\u3059\u3002\u9023\u7d9a\u7684\u306b\u97f3\u58f0\u3092\u53d6\u5f97\u3057\u3001\u5468\u6ce2\u6570\u6210\u5206\uff08\u30b0\u30e9\u30d5\uff09\u8868\u793a\u3057\u307e\u3059\u3002\u540c\u6642\u306b\u6700\u3082\u5f37\u3044\u5468\u6ce2\u6570\u6210\u5206\u3092\u691c\u51fa\u3057\u3001\u30b0\u30e9\u30d5\u4e0a\u30fb\u4e2d\u592e\u306b\u8868\u793a\u3057\u3066\u3044\u307e\u3059\u3002<br>\u3000\u9014\u4e2d\u3067\u30a6\u30a3\u30f3\u30c9\u30a6\u4e2d\u592e\u306b 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\u79d2\u6bce\u306b\u53d6\u308a\u8fbc\u3093\u3067\u51e6\u7406\u3057\u3066\u3044\u308b\u70ba\u3067\u3059\u3002<\/p>\n\n\n\n<figure class=\"wp-block-video aligncenter\"><video controls src=\"https:\/\/kats-eye.net\/info\/wp-content\/uploads\/2021\/05\/20210519_FFT.mp4\"><\/video><figcaption>\u30e9\u30ba\u30d1\u30a4\uff14\u3000\u97f3\u58f0\u30c7\u30fc\u30bf\u89e3\u6790\uff08\u6700\u5927\u5468\u6ce2\u6570\u6210\u5206\u691c\u51fa\uff09\u3000\u203b\uff12\u500d\u901f\u518d\u751f<br>\u3000\u3000<\/figcaption><\/figure>\n\n\n\n<p><br>\u3000\u4eca\u56de\u4f7f\u7528\u30de\u30a4\u30af\u306f\u6b21\u306e\u3082\u306e\u3067\u3059\u3002WEB\u30ab\u30e1\u30e9\u5185\u8535\u30de\u30a4\u30af\u3067\u3082\u4eca\u306e\u3068\u3053\u308d\u7279\u306b\u554f\u984c\u306f\u306a\u3044\u306e\u3067\u3059\u304c\u3001\u5c02\u7528\u5316\u3057\u305f\u3044\u3068\u3044\u3046\u6c17\u6301\u3061\u304c\u9ad8\u307e\u308a\u8cfc\u5165\u3057\u307e\u3057\u305f\u3002<\/p>\n\n\n\n<!-- START MoshimoAffiliateEasyLink --><script 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id=\"msmaflink-fDTHC\">\u30ea\u30f3\u30af<\/div><!-- MoshimoAffiliateEasyLink END -->\n\n\n\n<p>\u3000\u3000\u3000<\/p>\n\n\n\n<h2>\u97f3\u58f0\u89e3\u6790\u7d50\u679c\u306e\u78ba\u8a8d<\/h2>\n\n\n\n<p>\u3000\u5225\u306e\u30d1\u30bd\u30b3\u30f3\u3067\u5468\u6ce2\u6570\u3092\u8a2d\u5b9a\u3057\u3066\u9cf4\u3089\u3057\u305f\u97f3\u3092\u691c\u51fa\u3057\u3066\u3044\u307e\u3059\u3002\u4eca\u56de\u306f\u3001\u201c261.626Hz\u201d\u3001\u201c391.995Hz\u201d\u3001\u201c523.251Hz\u201d \u306e\uff13\u3064\u306e\u5468\u6ce2\u6570\u306e\u97f3\u306b\u3064\u3044\u3066\u78ba\u8a8d\u3057\u3001\u6b63\u3057\u304f\u691c\u51fa\u3055\u308c\u3066\u3044\u308b\u3053\u3068\u3092\u78ba\u8a8d\u3057\u307e\u3057\u305f\u3002<br>\u3000\u53c2\u8003\u307e\u3067\u306b\u97f3\u968e\uff08\uff1f\uff09\u3068\u5468\u6ce2\u6570\u306e\u95a2\u4fc2\u3092\u6b21\u8868\u306b\u793a\u3057\u307e\u3059\u3002\u4eca\u56de\u3001\u78ba\u8a8d\u5468\u6ce2\u6570\u306f\u3001\uff3b\u30c9\uff3d\u3001\uff3b\u30bd\uff3d\u3001\uff3b\u30c9\uff3d\u306b\u76f8\u5f53\u3057\u307e\u3059\u3002<br><\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td class=\"has-text-align-center\" data-align=\"center\"><span style=\"color:#ff0000\" class=\"has-inline-color\">\u30c9<\/span><\/td><td class=\"has-text-align-center\" data-align=\"center\">\u30ec<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u30df<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u30d5\u30a1<\/td><td class=\"has-text-align-center\" data-align=\"center\"><span style=\"color:#ff0000\" class=\"has-inline-color\">\u30bd<\/span><\/td><td class=\"has-text-align-center\" data-align=\"center\">\u30e9<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u30b7<\/td><td class=\"has-text-align-center\" data-align=\"center\"><span style=\"color:#ff0000\" class=\"has-inline-color\">\u30c9<\/span><\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><span style=\"color:#ff0000\" class=\"has-inline-color\">261<sub>.626<\/sub><\/span><\/td><td class=\"has-text-align-center\" data-align=\"center\">293<sub>.665<\/sub><\/td><td class=\"has-text-align-center\" data-align=\"center\">329<sub>.628<\/sub><\/td><td class=\"has-text-align-center\" data-align=\"center\">349<sub>.228<\/sub><\/td><td class=\"has-text-align-center\" data-align=\"center\"><span style=\"color:#fb030f\" class=\"has-inline-color\">391<sub>.995<\/sub><\/span><\/td><td class=\"has-text-align-center\" data-align=\"center\">440<sub>.000<\/sub><\/td><td class=\"has-text-align-center\" data-align=\"center\">493<sub>.883<\/sub><\/td><td class=\"has-text-align-center\" data-align=\"center\"><span style=\"color:#ff0000\" class=\"has-inline-color\">523<sub>.251<\/sub><\/span><\/td><\/tr><\/tbody><\/table><figcaption>\u97f3\u968e\uff08\uff1f\uff09\u3068\u5468\u6ce2\u6570\uff3bHz\uff3d<br><\/figcaption><\/figure>\n\n\n\n<p>   <br> <\/p>\n\n\n\n<p>\u3000\u3000\u691c\u51fa\u72b6\u6cc1\u2460\u2461\u2462\u306e\u901a\u308a\u3001\u6b63\u3057\u304f\u691c\u51fa\u3067\u304d\u305f\u69d8\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u3010 \u7279\u5b9a\u5468\u6ce2\u6570\u306e\u691c\u51fa\u72b6\u6cc1\u2460\u3000261 Hz \u3011<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><img loading=\"lazy\" width=\"926\" height=\"743\" src=\"https:\/\/kats-eye.net\/info\/wp-content\/uploads\/2021\/05\/261.png\" alt=\"\" class=\"wp-image-5739\" srcset=\"https:\/\/kats-eye.net\/info\/wp-content\/uploads\/2021\/05\/261.png 926w, https:\/\/kats-eye.net\/info\/wp-content\/uploads\/2021\/05\/261-300x241.png 300w, https:\/\/kats-eye.net\/info\/wp-content\/uploads\/2021\/05\/261-768x616.png 768w\" sizes=\"(max-width: 926px) 100vw, 926px\" \/><\/figure><\/div>\n\n\n\n<p>    <\/p>\n\n\n\n<p>\u3010 \u7279\u5b9a\u5468\u6ce2\u6570\u306e\u691c\u51fa\u72b6\u6cc1\u2461\u3000391 Hz \u3011<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><img loading=\"lazy\" width=\"921\" height=\"739\" src=\"https:\/\/kats-eye.net\/info\/wp-content\/uploads\/2021\/05\/391.png\" alt=\"\" class=\"wp-image-5740\" srcset=\"https:\/\/kats-eye.net\/info\/wp-content\/uploads\/2021\/05\/391.png 921w, https:\/\/kats-eye.net\/info\/wp-content\/uploads\/2021\/05\/391-300x241.png 300w, https:\/\/kats-eye.net\/info\/wp-content\/uploads\/2021\/05\/391-768x616.png 768w\" sizes=\"(max-width: 921px) 100vw, 921px\" \/><\/figure><\/div>\n\n\n\n<p>\u3000\u3000\u3000<\/p>\n\n\n\n<p>\u3010 \u7279\u5b9a\u5468\u6ce2\u6570\u306e\u691c\u51fa\u72b6\u6cc1\u2462\u3000523 Hz \u3011<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><img loading=\"lazy\" width=\"1024\" height=\"823\" src=\"https:\/\/kats-eye.net\/info\/wp-content\/uploads\/2021\/05\/523-1024x823.png\" alt=\"\" class=\"wp-image-5741\" srcset=\"https:\/\/kats-eye.net\/info\/wp-content\/uploads\/2021\/05\/523-1024x823.png 1024w, https:\/\/kats-eye.net\/info\/wp-content\/uploads\/2021\/05\/523-300x241.png 300w, https:\/\/kats-eye.net\/info\/wp-content\/uploads\/2021\/05\/523-768x617.png 768w, https:\/\/kats-eye.net\/info\/wp-content\/uploads\/2021\/05\/523.png 1333w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure><\/div>\n\n\n\n<p>\u3000\u3000<br>\u3000<\/p>\n\n\n\n<h2>\u30d7\u30ed\u30b0\u30e9\u30e0<\/h2>\n\n\n\n<h5>\u2460 \u78ba\u8a8d\u7528\u97f3\u58f0\u767a\u751f\u30d7\u30ed\u30b0\u30e9\u30e0\u3000\uff08\u5225\u30d1\u30bd\u30b3\u30f3\uff09<\/h5>\n\n\n\n<p>\u3000\u884c\u756a\uff14\u3067\u300c\u30c9\u30fb\u30ec\u30fb\u30df\u30fb\u30d5\u30a1\u30fb\u30bd\u30fb\u30e9\u30fb\u30b7\u30fb\u30c9\u300d\u76f8\u5f53\u306e\u5468\u6ce2\u6570\u3092\u5b9a\u7fa9\u3057\u3001\u884c\u756a\uff18\u3067\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u5909\u3048\u3066\u3001\u5468\u6ce2\u6570\u5909\u66f4\u5f8c\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u5b9f\u884c\u3057\u307e\u3059\u3002\u97f3\u767a\u751f\u6642\u9593\u306f\u884c\u756a\uff19\u3067\u5b9a\u7fa9\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-python\" data-file=\"BEEP.py\" data-lang=\"Python\"><code>import pyaudio\nimport numpy as np\n\nSND_FRQ= [ 261.626 , 293.665 , 329.628 , 349.228 , 391.995 , 440.000 , 493.883 , 523.251 ]\n\n\nRATE = 44100            # \u30b5\u30f3\u30d7\u30ea\u30f3\u30b0\u30ec\u30fc\u30c8\nsndFrq = SND_FRQ[0]     # \u5468\u6ce2\u6570\u8a2d\u5b9a\nt_Beep = 6              # \u51e6\u7406\u6642\u9593\n\n# \u51fa\u529b\u30b9\u30c8\u30ea\u30fc\u30e0\np = pyaudio.PyAudio()                               \nstream = p.open(format=pyaudio.paFloat32 , channels=1 , rate=RATE , frames_per_buffer=1024 , output=True)\n\ntone = np.sin(np.arange(int(t_Beep * RATE)) * (float(sndFrq) * np.pi * 2 \/ RATE))\nstream.write(tone.astype(np.float32).tobytes())\nstream.close()<\/code><\/pre><\/div>\n\n\n\n<p>\u3000\u97f3\u58f0\u767a\u58f0\u30d7\u30ed\u30b0\u30e9\u30e0\u306f\u3001Windows10\u30d1\u30bd\u30b3\u30f3\u306b\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3057\u305fpython3.8 \u3067\u52d5\u304b\u3057\u3066\u3044\u307e\u3059\u3002\u201cPyAudio\u201d \u304c\u3001\u3046\u307e\u304f\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3067\u304d\u306a\u304b\u3063\u305f\u306e\u3067\u3001\u4e00\u65e6\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u5f8c\u3001\u30ed\u30fc\u30ab\u30eb\u74b0\u5883\u3067\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3057\u3066\u3044\u307e\u3059\u3002\u79c1\u306e\u74b0\u5883\u3067\u306f\u7279\u306b\u554f\u984c\u306f\u7121\u3044\u3088\u3046\u3067\u3059\u304c\u3001\u5229\u7528\u3055\u308c\u308b\u5834\u5408\u306f\u81ea\u5df1\u8cac\u4efb\u3067\u304a\u9858\u3044\u81f4\u3057\u307e\u3059\u3002<br>     [\u53c2\u8003]  https:\/\/www.lfd.uci.edu\/~gohlke\/pythonlibs\/#pyaudio<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-plain\"><code>py -m pip install PyAudio-0.2.11-cp38-cp38-win_amd64.whl<\/code><\/pre><\/div>\n\n\n\n<p>   <\/p>\n\n\n\n<h5>\u2461 \u97f3\u58f0\u89e3\u6790\u30d7\u30ed\u30b0\u30e9\u30e0<\/h5>\n\n\n\n<p>\u3000\u7406\u89e3\u306e\u904e\u7a0b\u3067\u8abf\u3079\u305f\u3053\u3068\u306a\u3069\u306f\u30b3\u30e1\u30f3\u30c8\u306b\u8a18\u8f09\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-python\" data-file=\"20210517_PyAudioTes_004.py\" data-lang=\"Python\"><code>import pyaudio\nimport wave\nimport numpy as np\nimport matplotlib.pyplot as plt\nfrom scipy.signal import argrelmax\n\nfrm_dt = pyaudio.paInt16    # 16-bit resolution\nchnl = 1                    # 1 channel\n\ns_rate = 44100              # 44.1kHz\u3000\u30b5\u30f3\u30d7\u30ea\u30f3\u30b0\u5468\u6ce2\u6570\nN = 100                     # chunk \/ s_rate = samp_time (sec)\nchunk = 1024 * N            # 2^12 \u4e00\u56de\u306e\u53d6\u5f97\u30c7\u30fc\u30bf\u6570 (1024*50\/44100= 1.16 (sec), 1024*100\/44100= 2.32 (sec))\ndev_idx = 5                 # \u30c7\u30d0\u30a4\u30b9\u756a\u53f7\uff08\u5fc5\u9808\u3067\u306f\u306a\u3044\uff1f\uff08\u512a\u5148\u5ea6\u6307\u5b9a\u3057\u3066\u3044\u308b\u70ba\uff1f\uff09\uff09\n\naudio = pyaudio.PyAudio()   # create pyaudio instantiation\n\n# \u30b9\u30c8\u30ea\u30fc\u30e0\u306e\u4f5c\u6210\nstream = audio.open(format = frm_dt , rate = s_rate , channels = chnl, input_device_index = dev_idx , \\\n                    input = True , frames_per_buffer = chunk )\n\n# x\u8ef8\nwv_x1 = np.linspace(0, s_rate, chunk)\nchnk_lmt = int(chunk\/50)      # \u25a0 X\u8ef8\u5e45\u8abf\u6574\nwv_x2 = wv_x1[0:chnk_lmt]\n\nprint(&quot;Started&quot;)\n\n# \u97f3\u58f0\u53d6\u5f97\/FFT\u51e6\u7406\nwhile True:\n    try:\n        # \u97f3\u58f0\u30c7\u30fc\u30bf\u53d6\u5f97\n        data = stream.read(chunk , exception_on_overflow=False )\n        ndarray = np.frombuffer(data, dtype=&#39;int16&#39;)\n        \n        # FFT\n        wv_y1 = np.fft.fft(ndarray)\n        wv_y1 = np.abs(wv_y1)\n        wv_y1[0] = 0\n\n        wv_y2 = wv_y1[0:chnk_lmt]\n\n        peak_args = argrelmax(wv_y2,order=500)                  # \uff8b\uff9f\uff70\uff78\u691c\u51fa(argrelmax:\u6975\u5927\u5024\uff72\uff9d\uff83\uff9e\uff6f\uff78\uff7d ,order:\u6b21\u6975\u5927\u5024\u5224\u5b9a\u7bc4\u56f2\/\u9593\u9694(\u6700\u5c0f:int 1))\n        f_peak = wv_y2[peak_args]                               # \uff72\uff9d\uff83\uff9e\uff6f\uff78\uff7d\u3092\u5f37\u5ea6\u5024\u306b\u5909\u63db\n        f_peak_argsort = f_peak.argsort()[::-1]                 # \u5f37\u5ea6\u964d\u9806\u4e26\u66ff(argsort\uff1a\u5024\u6607\u9806\uff7f\uff70\uff84(\uff72\uff9d\uff83\uff9e\uff6f\uff78\uff7d\u8fd4\u3059)\uff0c[::-1]\u964d\u9806\uff7f\uff70\uff84\u6642)\n        peak_args_sort = peak_args[0][f_peak_argsort]           # \u5f37\u5ea6\u964d\u9806\u4e26\u66ff\u5f8c\u306e\uff72\uff9d\uff83\uff9e\uff6f\uff78\uff7d\u914d\u5217\u3092\u6307\u5b9a\u3057\u3001\u5f37\u5ea6\u964d\u9806\u914d\u5217\u3092\u53d6\u5f97\n        frq_tmp = wv_x2[peak_args_sort[0]] \n        frq_str = str(round(1000*frq_tmp)\/1000)\n        \n        # \u30ea\u30a2\u30eb\u30bf\u30a4\u30e0\u306b\u30b0\u30e9\u30d5\u8868\u793a\n        plt.plot(wv_x2 , wv_y2)\n        plt.title(&quot;Peak Detected : &quot; + frq_str)\n        plt.draw()\n\n        plt.pause(0.0001)\n        plt.cla()\n        \n        feature = np.where((wv_y2 &gt; 0.5*1e7) & (wv_x2 &gt; 45))    # wv_x2:\u5bfe\u8c61\u5468\u6ce2\u6570\u57df\uff0cwv_y2:\u5468\u6ce2\u6570\u306e\u5f37\u5ea6\uff08\uff1f\uff09\n        frq_ary = feature[0] * (s_rate \/ chunk)                 # \u6307\u5b9a\u5f37\u5ea6\u4ee5\u4e0a\u306e\u5468\u6ce2\u6570\u62bd\u51fa\u30fb\u51fa\u529b\n        frq_ary = np.round(10*frq_ary)                          # \u5c0f\u6570\u70b9\uff11\u6841\u4ee5\u4e0b\u56db\u6368\u4e94\u5165\n        print( frq_ary )\n\n        \n    except KeyboardInterrupt:\n        print(&quot;Ctrl+C\u3067\u505c\u6b62\u3057\u307e\u3057\u305f&quot;)\n        break\n\nprint(&quot;Finished&quot;)\n\n# \u30b9\u30c8\u30ea\u30fc\u30e0\u306e\u7d42\u4e86\nstream.stop_stream()\nstream.close()\naudio.terminate()<\/code><\/pre><\/div>\n\n\n\n<p>\u3000\u30b5\u30f3\u30d7\u30ea\u30f3\u30b0\u5468\u6ce2\u6570\u3084\u30b0\u30e9\u30d5\u5468\u6ce2\u6570\u8ef8\u306e\u8003\u3048\u65b9\u7b49\u304c\u3088\u304f\u308f\u304b\u3089\u306a\u304b\u3063\u305f\u306e\u3067\u3001\u6b21\u8868\u306e\u69d8\u306a\u3053\u3068\u3082\u8abf\u3079\u307e\u3057\u305f\u3002<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td>\u30d5\u30fc\u30ea\u30a8<br>\u5909\u63db<\/td><td>\u5143\u306e\u6ce2\u5f62\u3092  sin\u95a2\u6570\u306b\u5206\u985e\u3057\u3001\u5404sin\u6ce2\u306e\u632f\u5e45\u3092\u5468\u6ce2\u6570\u6bce\u306b\u307e\u3068\u3081\u308b\u51e6\u7406\u3002<\/td><\/tr><tr><td>FFT<\/td><td>\u9ad8\u901f\u30d5\u30fc\u30ea\u30a8\u5909\u63db\uff08Fast Fourier Transform\uff09\u96e2\u6563\u30d5\u30fc\u30ea\u30a8\u5909\u63db\u3092\u8a08\u7b97\u6a5f\u4e0a\u3067\u9ad8\u901f\u8a08\u7b97\u3059\u308b\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u3002<\/td><\/tr><tr><td>\u6a19\u672c\u5316\u3000\u3000\u3000<\/td><td>\u9023\u7d9a\u95a2\u6570\u306e\u70b9\u306e\u5024\u3092\u6a19\u672c\u3068\u3057\u3066\u96e2\u6563\u95a2\u6570\u5909\u63db\u51e6\u7406\u3002<\/td><\/tr><tr><td>\u6a19\u672c\u5316<br>\u5b9a\u7406<\/td><td>\u6642\u7cfb\u5217\u30c7\u30fc\u30bf\u306b\u542b\u307e\u308c\u308b\u6700\u5927\u5468\u6ce2\u6570\u306e2\u500d\u3092\u8d85\u3048\u305f\u5468\u6ce2\u6570\u3067\u6a19\u672c\u5316\uff08\u30b5\u30f3\u30d7\u30ea\u30f3\u30b0\uff09\u3059\u308c\u3070\u5b8c\u5168\u306b\u5143\u306e\u6ce2\u5f62\u306b\u518d\u69cb\u6210\u3055\u308c\u308b\u3002\u30ca\u30a4\u30ad\u30b9\u30c8\u5468\u6ce2\u6570\u306f\u30b5\u30f3\u30d7\u30ea\u30f3\u30b0\u5468\u6ce2\u6570\u306e\uff11\uff0f\uff12\u306e\u5468\u6ce2\u6570\u306e\u3053\u3068\u3002\u30b5\u30f3\u30d7\u30ea\u30f3\u30b0\u5468\u6ce2\u6570 44100Hz\u306e\u5834\u5408\u300122050Hz\u3068\u306a\u308a FFT\u3067\u6b63\u3057\u304f\u691c\u51fa\u3067\u304d\u308b\u6700\u5927\u306e\u5468\u6ce2\u6570\u3068\u306a\u308b\u3002<br>\u4eba\u9593\u8074\u899a\uff1a20Hz\u301c20KHz \u2192 \uff7b\uff9d\uff8c\uff9f\uff98\uff9d\uff78\uff9e\uff1a40KHz\u4ee5\u4e0a<br>\uff08\u97f3\u58f0\u8a8d\u8b58\u306e\u5834\u5408\uff1a\u301c8KHz\u7a0b\u5ea6\uff09<\/td><\/tr><tr><td>\u6298\u308a\u8fd4\u3057\u96d1\u97f3<\/td><td>\u30ca\u30a4\u30ad\u30b9\u30c8\u5468\u6ce2\u6570\u3092\u8d85\u3048\u308b\u5468\u6ce2\u6570\u6210\u5206\u3092\u542b\u3080\u4fe1\u53f7\u304c\u5165\u529b\u3055\u308c\u305f\u5834\u5408\u3001\u30a8\u30a4\u30ea\u30a2\u30b9\uff08\u507d\u4fe1\u53f7\uff09\u3068\u3057\u3066\u691c\u51fa\u3002\u5143\u306e\u4fe1\u53f7\u3068\u30a8\u30a4\u30ea\u30a2\u30b9\u304c\u91cd\u306a\u3063\u3066\u751f\u3058\u308b\u6b6a\u306e\u3053\u3068\u3002<\/td><\/tr><tr><td>\u5468\u6ce2\u6570\u8ef8<br>\uff08\u6a2a\u8ef8\uff09<\/td><td>f [n]  =  ( fs * n ) \u00f7 N   (n=0 , \uff65\uff65\uff65 , N-1)<br>N : FFT\uff8e\uff9f\uff72\uff9d\uff84\u6570\uff0cfs : \uff7b\uff9d\uff8c\uff9f\uff98\uff9d\uff78\uff9e\u5468\u6ce2\u6570\uff0cn : \u914d\u5217\uff72\uff9d\uff83\uff9e\uff6f\uff78\uff7d<\/td><\/tr><tr><td>\u5206\u89e3\u80fd<\/td><td>\u30b9\u30da\u30af\u30c8\u30eb\u5468\u6ce2\u6570\u5206\u89e3\u80fd\uff1a\uff11\uff0f[\u6642\u9593\u7a93\u9577(sec)] Hz<br>\u203b\u6642\u9593\u7a93\u9577\uff11sec \u6642\u5206\u89e3\u80fd\uff1a\uff11Hz<br>\u203b\u6642\u9593\u7a93\u957710sec\u6642\u5206\u89e3\u80fd\uff1a \uff10.\uff11Hz<br>\u6642\u9593\u7a93\u3092\u9577\u304f\u3059\u308b\u3068\u5206\u89e3\u80fd\u306f\u4e0a\u304c\u308b\u304c\u3001\u5fdc\u7b54\u306f\u920d\u3044\u3002<\/td><\/tr><\/tbody><\/table><figcaption>\u3000\u3000<br><\/figcaption><\/figure>\n\n\n\n<h2>\u307e\u3068\u3081<\/h2>\n\n\n\n<p>\u3000\u3088\u304f\u7406\u89e3\u51fa\u6765\u3066\u3044\u307e\u305b\u3093\u304c\u3001\u51e6\u7406\u306e\u6d41\u308c\u306f\u5c11\u3057\u7406\u89e3\u3067\u304d\u307e\u3057\u305f\u3002\u767a\u58f0\u97f3\u3068\u8a08\u6e2c\u306e\u540c\u671f\u306a\u3069\u8ab2\u984c\u304c\u3042\u308b\u3053\u3068\u3092\u8a8d\u8b58\u3057\u307e\u3057\u305f\u3002\u4e00\u65b9\u3067\u7c21\u5358\u306a\u30b3\u30de\u30f3\u30c9\u3067FFT\u51e6\u7406\u3067\u304d\u308b\u306a\u3093\u3066\u9a5a\u304d\u3067\u3059\u3002<br>\u3000<br><br><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6982\u8981 \u3000\u904e\u53bb\u6295\u7a3f\u3067\u300cJulius\u300d\u3068\u3044\u3046\u97f3\u58f0\u8a8d\u8b58\u30a8\u30f3\u30b8\u30f3\u3092\u4f7f\u3044\u3001\u5e7e\u3064\u304b\u306e\u65e5\u672c\u8a9e\u8a9e\u53e5\u3092\u691c\u51fa\u3059\u308b\u5b9f\u9a13\u3092\u3057\u3066\u3044\u307e\u3059\u3002\u3000\u4eca\u56de\u306f\u97f3\u58f0\u306e\u5468\u6ce2\u6570\u6210\u5206\u306e\u4e2d\u3067\u6700\u3082\u5f37\u3044\u30d4\u30fc\u30af\u3092\u691c\u51fa\u3059\u308b\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u4f5c\u6210\u3057\u3066\u307f\u307e\u3057\u305f\u3002\u7d20\u4eba\u306a\u306e\u3067\u3088\u304f\u308f\u304b\u3063\u3066\u3044\u307e &hellip; <a href=\"https:\/\/kats-eye.net\/info\/2021\/05\/20\/raspy-snd-anal\/\" class=\"more-link\">\u7d9a\u304d\u3092\u8aad\u3080 <span class=\"screen-reader-text\">\u30e9\u30ba\u30d1\u30a4\uff14  \u97f3\u58f0\u30c7\u30fc\u30bf\u3092\u89e3\u6790\u3059\u308b\uff08FFT\u306b\u3088\u308b\u97f3\u58f0\u5468\u6ce2\u6570\u691c\u51fa\uff09<\/span> <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":5738,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[110],"tags":[164,116,111],"_links":{"self":[{"href":"https:\/\/kats-eye.net\/info\/wp-json\/wp\/v2\/posts\/5731"}],"collection":[{"href":"https:\/\/kats-eye.net\/info\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kats-eye.net\/info\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kats-eye.net\/info\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/kats-eye.net\/info\/wp-json\/wp\/v2\/comments?post=5731"}],"version-history":[{"count":35,"href":"https:\/\/kats-eye.net\/info\/wp-json\/wp\/v2\/posts\/5731\/revisions"}],"predecessor-version":[{"id":5783,"href":"https:\/\/kats-eye.net\/info\/wp-json\/wp\/v2\/posts\/5731\/revisions\/5783"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/kats-eye.net\/info\/wp-json\/wp\/v2\/media\/5738"}],"wp:attachment":[{"href":"https:\/\/kats-eye.net\/info\/wp-json\/wp\/v2\/media?parent=5731"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kats-eye.net\/info\/wp-json\/wp\/v2\/categories?post=5731"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kats-eye.net\/info\/wp-json\/wp\/v2\/tags?post=5731"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}