電子技術(shù) 課件 5.1 編碼

CODING編碼電子技術(shù)王瑾什么是編碼01編碼的形式02什么是編碼你身邊存在的編碼全屏播放動(dòng)畫常用的編碼給2個(gè)蘋果編碼，需用1位二進(jìn)制碼表示01二進(jìn)制編碼00011011給4個(gè)蘋果編碼，需用2位二進(jìn)制碼表示000001010011100101110111給8個(gè)蘋果編碼，需用3位二進(jìn)制碼表示給9個(gè)蘋果編碼，需用幾位二進(jìn)制碼表示呢？4如果編碼的對(duì)象是m個(gè)，二進(jìn)制碼的位數(shù)是n位2n≥m9個(gè)蘋果編碼問(wèn)題十進(jìn)制數(shù)自然二進(jìn)制數(shù)十進(jìn)制數(shù)自然二進(jìn)制數(shù)00000810001000191001200101010103001111101140100121100501011311016011014111070111151111自然二進(jìn)制編碼數(shù)字設(shè)備多采用二進(jìn)制011001101100……Binary日常生活多采用十進(jìn)制0，1，2，3，4，5，6……Decimal用二進(jìn)制來(lái)表示十進(jìn)制二—十進(jìn)制編碼（BCD碼）

十進(jìn)制數(shù)8421碼2421碼（A）2421碼（B）5421碼（A）5421碼（B）余3碼

余3循環(huán)碼右移碼0123456789000000010010001101000101011001111000100100000001001000110100010101100111111011110000000100100011010010111100110111101111000000010010001101000101011001111011110000000001001000110100100010011010101111000011010001010110011110001001101010111100001001100111010101001100110111111110101000000100001100011100111101111101111001110001100001常用BCD碼常用BCD碼ASCII碼AmericanStandardCodeforInformationInterchange美國(guó)信息交換標(biāo)準(zhǔn)代碼ISO碼InternationalOrganizationforStandardizationCode國(guó)際標(biāo)準(zhǔn)化組織碼0201字符編碼b7b6b5b4b3b2b100000101001110010111011100000001001000110100010101100111NULSOHSTXETXEOTENQACKBELDLEDC1DC2DC3DC4NAKSYNETBSP！“#$%&,01234567@ABCDEFGPQRSTUVW′abcdefgPqrstuvw10001001101010111100110111101111BSHTLFVTFFCRSOSICANEMSUBESCFSGSRSUS()*+,_./89:;<=>?HIJKLMNOXYZ[\]Λ-hIJklmnoxyz{|}~DELASCII碼b7b6b5b4b3b2b100000101001110010111011100000001001000110100010101100111NULSP$%01234567ABCDEFGPQRSTUVW10001001101010111100110111101111BSHTLFCREM()*+,_./89:=HIJKLMNOXY