{"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":10,"pdf_page":26,"physical_index":26,"physical_index_base":0,"printed_page_status":"recognized","page_sha256":"4798a15d5d97c942f91cad190488133e656a8b8f1f07cb0d34d582e47e5a85b7"},"chapter":"编码隐匿在计算机软硬件背后的语言","content":"现在这个表已经变得很简洁了。如果知道了码字中“点”和“划”的数目，那么以这个数目为指数的2的幂运算结果就是其总共可以表示的码字数。我们可以用下面这个简单的公式来概括上述表格所表示的内容：\n\n$$\nA B = \\frac { 1 } { 2 } A B = \\frac { 1 } { 2 } A B = 2 = 2 ^ { - \\frac { 1 } { 2 } \\cdot \\frac { 1 } { 2 } \\cdot \\frac { 1 } { 2 } \\cdot \\cos \\alpha + \\sin \\alpha }\n$$\n\n使用2的幂值的形式可以表示很多码字，在下一章中，我们还将接触另外一个例子。\n\n为了让莫尔斯码的解码过程更加简单，或许画张图会有所帮助，例如下面这张树型图。\n\n这张图给出了所有字母及其所对应的由“点”和“划”组成的连续序列。当对一串码字进行解码时，我们需要沿着箭头从左向右进行搜寻。以“点-划-点”的码字为例来说，当你需要找出这串码字所代表的字母时，应首先从图的左边开始，选择“点”的分支；然后继续沿着箭头向右选择“划”，接着又是一个“点”。找到最后一个“点”时结果就会紧随其后出现了，没错就是字母“R”。\n\n编码——隐匿在计算机软硬件背后的语言\n\n10","previous_page":9,"next_page":11}