{"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":133,"pdf_page":149,"physical_index":149,"physical_index_base":0,"printed_page_status":"recognized","page_sha256":"67f17958a4b5c8413c0a043a0fde20b1b755e3276567564cf1786b2a0c3579cb"},"chapter":"编码隐匿在计算机软硬件背后的语言","content":"但是在输入信号很微弱的时候，缓冲器就可以派上用场。之前提到过，这也就是很多年前在电报机中使用继电器的原因。另外，缓冲器还可以用于延迟一个信号。这是因为继电器需要一点时间几分之一秒才会被触发。\n\n本书从这里开始，继电器将会极少出现了。取而代之地，以后的电路会由缓冲器、反向器、四种基本逻辑门和其他由逻辑门组成的复杂电路（如2-4译码器）组成。当然，所有这些器件也是由继电器构成的，但我们用不着直接使用它了。\n\n前面在建立2-4译码器的时候，曾出现过这样一个小电路。\n\n两个输入信号经过反向器后作为与门的输入。这样的组合有时可以去掉反向器而画成如下的形式。\n\n注意与门输入端的小圆圈。这些小圆圈表示信号在那一点被反转将0（低电平）转换为1(高电平)，反之亦然。\n\n实际上，带有两个反向输入的与门和或非门是等价的。\n\n只有当输入都为0的时候，其输出才为1。\n\n类似的，带有两个反向输入的或门和与非门也是等价的。\n\n11门\n\n133","previous_page":132,"next_page":134}