{
  "id": 160361,
  "title": "Why is there a boundary at about 16000 Hz ?",
  "url": "/competitions/birdsong-recognition/discussion/160361",
  "author_name": "",
  "post_date": "2020-06-21T02:05:21.266448800Z",
  "votes": 2,
  "comment_count": 2,
  "views": 0,
  "content": "<p>Hi all, I'm new to Kaggle. It's my first discussion, so Please tell me if there are some mistakes.</p>\n\n<p>I cannot understand about that the boundary at about 16000 Hz in fft spectrum.\nrecording systems have a frequency range in about 16000 Hz ?\nhere is some example fft spectrum. thank you.</p>\n\n<p><img src=\"https://www.googleapis.com/download/storage/v1/b/kaggle-user-content/o/inbox%2F4512462%2Fa147d789d3857b0acaea91f141e1a4b8%2F2020-06-21%2010.39.47.png?generation=1592704343263046&amp;alt=media\" alt=\"\"></p>\n\n<p><img src=\"https://www.googleapis.com/download/storage/v1/b/kaggle-user-content/o/inbox%2F4512462%2F1d43a5463ba51a636e543c5ff316c296%2F2020-06-21%2010.53.55.png?generation=1592704482983436&amp;alt=media\" alt=\"\"></p>",
  "messages": [
    {
      "id": "894978",
      "postDate": "06/21/2020 02:05:21",
      "content": "<p>Hi all, I'm new to Kaggle. It's my first discussion, so Please tell me if there are some mistakes.</p>\n\n<p>I cannot understand about that the boundary at about 16000 Hz in fft spectrum.\nrecording systems have a frequency range in about 16000 Hz ?\nhere is some example fft spectrum. thank you.</p>\n\n<p><img src=\"https://www.googleapis.com/download/storage/v1/b/kaggle-user-content/o/inbox%2F4512462%2Fa147d789d3857b0acaea91f141e1a4b8%2F2020-06-21%2010.39.47.png?generation=1592704343263046&amp;alt=media\" alt=\"\"></p>\n\n<p><img src=\"https://www.googleapis.com/download/storage/v1/b/kaggle-user-content/o/inbox%2F4512462%2F1d43a5463ba51a636e543c5ff316c296%2F2020-06-21%2010.53.55.png?generation=1592704482983436&amp;alt=media\" alt=\"\"></p>",
      "rawMarkdown": "Hi all, I'm new to Kaggle. It's my first discussion, so Please tell me if there are some mistakes.\n\nI cannot understand about that the boundary at about 16000 Hz in fft spectrum.\nrecording systems have a frequency range in about 16000 Hz ?\nhere is some example fft spectrum. thank you.\n\n![](https://www.googleapis.com/download/storage/v1/b/kaggle-user-content/o/inbox%2F4512462%2Fa147d789d3857b0acaea91f141e1a4b8%2F2020-06-21%2010.39.47.png?generation=1592704343263046&amp;alt=media)\n\n![](https://www.googleapis.com/download/storage/v1/b/kaggle-user-content/o/inbox%2F4512462%2F1d43a5463ba51a636e543c5ff316c296%2F2020-06-21%2010.53.55.png?generation=1592704482983436&amp;alt=media)",
      "votes": null
    },
    {
      "id": "894991",
      "postDate": "06/21/2020 02:30:25",
      "content": "<p>The Xeno-canto data are stored in mp3 format. This format is lossy and based on our ability to perceive sound. Since our hearing is very poor at high frequencies, mp3 omits frequencies above 16 kHz. See also: <a href=\"https://www.soundonsound.com/techniques/what-data-compression-does-your-music\">https://www.soundonsound.com/techniques/what-data-compression-does-your-music</a></p>",
      "rawMarkdown": "The Xeno-canto data are stored in mp3 format. This format is lossy and based on our ability to perceive sound. Since our hearing is very poor at high frequencies, mp3 omits frequencies above 16 kHz. See also: https://www.soundonsound.com/techniques/what-data-compression-does-your-music",
      "votes": null
    },
    {
      "id": "894998",
      "postDate": "06/21/2020 02:42:05",
      "content": "<p>Thank you for teaching me !!</p>",
      "rawMarkdown": "Thank you for teaching me !!",
      "votes": null
    }
  ],
  "comments": [
    {
      "id": 894991,
      "author_name": "holgerklinck",
      "author_url": "",
      "post_date": "06/21/2020 02:30:25",
      "content": "<p>The Xeno-canto data are stored in mp3 format. This format is lossy and based on our ability to perceive sound. Since our hearing is very poor at high frequencies, mp3 omits frequencies above 16 kHz. See also: <a href=\"https://www.soundonsound.com/techniques/what-data-compression-does-your-music\">https://www.soundonsound.com/techniques/what-data-compression-does-your-music</a></p>",
      "votes": null,
      "replies": [
        {
          "id": 894998,
          "author_name": "teppeisudo",
          "author_url": "",
          "post_date": "06/21/2020 02:42:05",
          "content": "<p>Thank you for teaching me !!</p>",
          "votes": null,
          "replies": []
        }
      ]
    }
  ],
  "raw_markdown_by_id": {
    "894978": "Hi all, I'm new to Kaggle. It's my first discussion, so Please tell me if there are some mistakes.\n\nI cannot understand about that the boundary at about 16000 Hz in fft spectrum.\nrecording systems have a frequency range in about 16000 Hz ?\nhere is some example fft spectrum. thank you.\n\n![](https://www.googleapis.com/download/storage/v1/b/kaggle-user-content/o/inbox%2F4512462%2Fa147d789d3857b0acaea91f141e1a4b8%2F2020-06-21%2010.39.47.png?generation=1592704343263046&amp;alt=media)\n\n![](https://www.googleapis.com/download/storage/v1/b/kaggle-user-content/o/inbox%2F4512462%2F1d43a5463ba51a636e543c5ff316c296%2F2020-06-21%2010.53.55.png?generation=1592704482983436&amp;alt=media)",
    "894991": "The Xeno-canto data are stored in mp3 format. This format is lossy and based on our ability to perceive sound. Since our hearing is very poor at high frequencies, mp3 omits frequencies above 16 kHz. See also: https://www.soundonsound.com/techniques/what-data-compression-does-your-music",
    "894998": "Thank you for teaching me !!"
  },
  "source": "meta"
}