{"resolved":true,"match_type":"uuid","source_type":"original_book","book_id":"38270854-596f-4a26-8183-db8c968c6020","title":"编码 隐匿在计算机软硬件背后的语言","author":null,"edition":null,"publisher":null,"year":null,"isbn":"9787121181184","requested_by":"printed_page","book":{"source_type":"original_book","book_id":"38270854-596f-4a26-8183-db8c968c6020","id":"38270854-596f-4a26-8183-db8c968c6020","uuid":"38270854-596f-4a26-8183-db8c968c6020","title":"编码 隐匿在计算机软硬件背后的语言","normalized_title":"编码隐匿在计算机软硬件背后的语言","author":null,"edition":null,"publisher":null,"year":null,"isbn":"9787121181184","isbns":["9787121181184","0123456789","6044921875","3039331000","0000000000","0000000000000"],"parsed":true,"ai_readable":true,"document_type":"book","page_count":438,"navigation_url":"https://workshop.closeclaw.top/ai/book/38270854-596f-4a26-8183-db8c968c6020","title_url":"https://workshop.closeclaw.top/ai/title/%E7%BC%96%E7%A0%81%20%E9%9A%90%E5%8C%BF%E5%9C%A8%E8%AE%A1%E7%AE%97%E6%9C%BA%E8%BD%AF%E7%A1%AC%E4%BB%B6%E8%83%8C%E5%90%8E%E7%9A%84%E8%AF%AD%E8%A8%80","fixed_page_url_template":"https://workshop.closeclaw.top/ai/book/38270854-596f-4a26-8183-db8c968c6020/page/{printed_page}","path_api_url_template":"https://workshop.closeclaw.top/api/ai/book/38270854-596f-4a26-8183-db8c968c6020/page/{printed_page}","read_url":"https://workshop.closeclaw.top/api/ai/read/38270854-596f-4a26-8183-db8c968c6020","page_url":"https://workshop.closeclaw.top/api/ai/books/38270854-596f-4a26-8183-db8c968c6020/page","search_url":"https://workshop.closeclaw.top/api/ai/books/38270854-596f-4a26-8183-db8c968c6020/search"},"page":{"printed_page":9,"pdf_page":25,"physical_index":25,"physical_index_base":0,"printed_page_status":"recognized","page_sha256":"738d49e8abe17612ff9409886807dec2324f9349b6d17dede967c15bf60fae28"},"chapter":"编码隐匿在计算机软硬件背后的语言","content":"综合以上数据来看，这四张表包含了2+4+8+16组码字，总共表示了30个字母，比拉丁字母表的26个字母还要多出4个。所以，你会注意到最后一个表中有4组编码是用来表示重音字母的。\n\n当有人给你发送莫尔斯码的时候，上述四张表可能会让你的解码工作变得轻松很多。当接收到某一代表特定字母的码字后，你就可以知道其中所包含的“点”和“划”的数目，那么你至少可以很快找到对应的表格去进行查找。每个表格都组织得很规整，全部是“点”的码字被排在左上角，而全部是“划”的则被排在右下角。\n\n你发现这四张表格在大小上的规律了么？注意看，每个表格所包含的码字数目都是前一张的两倍。这其实很好理解：每个表格所含有的码字，可以看成是在前一张表格所包含的全部码字上再加一个“点”，或者再加一个“划”而组成的新码字。\n\n我们可以用如下这样一个列表来总结这个有趣的规律。\n\n在这四个表中，每张表的码字数都是前一张表码字数量的两倍，因此如果第一张表含有2个码字，那么第二张表则含有2×2个码字，而第三个表就有2×2×2个码字。下面用另一种方式呈现这个规律。\n\n当然，如果我们遇到了数字的自乘，就可以通过幂的方式来表示它。例如，2×2×2×2可以记作 $2 ^ { 4 }$ (2的4次幂)。数字2、4、8和16都是以2为底数的幂值，因为你可以通过使其自身乘2来得到它们。由此我们的总结列表也可以写成下面这种样子。\n\n2 编码与组合\n\n9","previous_page":8,"next_page":10}