{"id":2870,"date":"2020-12-20T16:27:32","date_gmt":"2020-12-20T16:27:32","guid":{"rendered":"http:\/\/mp4gain.com\/mp4gain\/?p=2870"},"modified":"2020-12-20T16:27:32","modified_gmt":"2020-12-20T16:27:32","slug":"how-is-the-digital-representation-of-signals-different-from-analog","status":"publish","type":"post","link":"https:\/\/mp4gain.com\/mp4gain\/how-is-the-digital-representation-of-signals-different-from-analog\/","title":{"rendered":"How is the digital representation of signals different from analog?"},"content":{"rendered":"<p><strong>How is the digital representation of signals different from analog?<\/strong><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone\" src=\"https:\/\/screaminfx.com\/images\/tech-images\/what-is-analog-verse-digital-explanation.jpg\" alt=\"analog and digital\" width=\"600\" height=\"395\" \/><\/p>\n<p>The traditional analog representation of signals is based on the similarity (similarity) of electrical signals (changes in current and voltage) with the original signals represented by them (sound pressure, temperature, speed, etc.).<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone\" src=\"https:\/\/d29rinwu2hi5i3.cloudfront.net\/article_media\/f08699f9-8066-4f3b-b602-d2bb41a32534\/005_digital-vs-analog-chart.jpg\" alt=\"Analog vs Digital\" width=\"843\" height=\"597\" \/><\/p>\n<p>As well as in the similarity of the forms of the electrical signals in various points of the amplification or transmission path. The shape of the electrical curve that describes (also called transfer) the original signal is as close as possible to the shape of the curve of this signal.<\/p>\n<p>Such a representation is the most accurate, however, the slightest distortion of the shape of the electrical carrier signal will inevitably involve the same distortion of the shape and signal of the carrier. In terms of information theory, the amount of information in the carrier signal is exactly equal to the amount of information in the original signal, and the electrical representation does not contain redundancy that could protect the carried signal from distortion during storage, transmission. and amplification.<\/p>\n<p>The digital representation of electrical signals is designed to add redundancy to avoid unwanted interference. For this, serious restrictions are imposed on the carrier electrical signal: its amplitude can take only two limit values: 0 and 1. In this case, the entire zone of possible amplitudes is divided into three zones: the lower one represents zero values, the upper , unique, and the intermediate is prohibited, inward. only interference can get in. Therefore, any interference whose amplitude is less than half the amplitude of the carrier signal does not affect the correct transmission of values \u200b\u200b0 and 1. Interference with a higher amplitude also does not affect whether the duration of the interference pulse is significantly less than the duration of the information pulse.<\/p>\n<p>The digital signal formed in this way can carry any useful information that is encoded in the form of a sequence of bits: zeros and ones; electrical and sound signals are a particular case of such information. Here, the amount of information in the digital carrier signal is much higher than in the original encoded signal, so the carrier signal has a certain redundancy with respect to the original, and any distortion of the waveform of the carrier signal, which still retains the receiver&#8217;s ability to correctly distinguish between zeros and ones, does not affect the reliability of the transmitted signal. by this information signal. However, in the case of exposure to significant interference, the shape of the signal can be distorted to such an extent that the precise transmission of the information being transferred becomes impossible: errors appear in it, which, with a simple coding method , the receiver can not only correct, but also detect. To further increase the resistance of a digital signal to interference and distortion, two types of digital redundancy coding are used: verification codes (EDC &#8211; Error Detection Code) and correction (ECC &#8211; Error Correction Code). ). Digital encoding is simply adding extra bits to the original information and \/ or converting the original bit string into a longer string and other structure. EDC allows you to simply detect the fact of an error: a distortion or loss of a useful one or the appearance of a false digit, but the information that is transferred in this case is also distorted; ECC allows you to immediately correct detected errors, keeping the information that is transferred unchanged.<\/p>\n<p>Each type of EDC \/ ECC has its own capacity limit to detect and correct errors, after which undetected errors and distortions of the transferred information begin again. An increase in the volume of EDC \/ ECC relative to the volume of the original information generally increases the detection and correction capabilities of these codes.<\/p>\n<p>Like EDC, the popular cyclic redundancy code CRC (Cyclic Redundancy Check), whose essence is the complex mixing of the initial information in the block and the formation of short binary words, whose bits have a strong cross-dependence on each bit of the block. Changing even one bit in a block causes a significant change in the CRC calculated from it, and the probability of such a bit distortion where the CRC does not change is extremely small even with short CRC words (a small percentage of the length of the block). The ECC uses the Hamming and Reed-Solomon codes, which also include EDC functions.<\/p>\n<p>The information redundancy of the digital carrier signal leads to a significant expansion (by an order of magnitude or more) of the frequency band required for its successful transmission.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>How is the digital representation of signals different from analog? The traditional analog representation of signals is based on the similarity (similarity) of electrical signals (changes in current and voltage) with the original signals represented by them (sound pressure, temperature, speed, etc.). As well as in the similarity of the forms of the electrical signals &hellip; <a href=\"https:\/\/mp4gain.com\/mp4gain\/how-is-the-digital-representation-of-signals-different-from-analog\/\" class=\"more-link\">Continue reading<span class=\"screen-reader-text\"> &#8220;How is the digital representation of signals different from analog?&#8221;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[56923,56928,54152,56932,56933,51198,56931,56930,56934,56925,56927,56926,56938,56936,51200,47443,56929,56943,55142,51204,56940,56941,55148,56948,55168,56939,56924,56937,56942,56949,55144,55152,56944,56945,37166,51214,56947,56946,56935,51220,56950,56953,56955,56952,56954,56951],"class_list":["post-2870","post","type-post","status-publish","format-standard","hentry","category-audio-video","tag-are-analogue-digital","tag-are-digital-better-than-analog","tag-are-digital-signals-analogue","tag-can-digital-radio-receive-analog-signal","tag-can-digital-scanners-pick-up-analog","tag-can-digital-to-analog-converter","tag-can-digital-tv-receive-analog-signal","tag-can-mix-digital-analogue-scalextric-track","tag-can-use-digital-servo-analog-receiver","tag-digital-is-analog","tag-digital-is-analog-audio","tag-digital-is-analog-computer","tag-do-digital-antennas-work-with-analog-tvs","tag-do-digital-scanners-receive-analog","tag-do-digital-to-analog-converters-work","tag-does-digital-sound-better-than-analog","tag-how-are-digital-and-analog-signals-similar","tag-how-digital-analog-converter-works","tag-how-do-analog-digital-work","tag-how-does-analog-digital-converter-work","tag-how-does-digital-to-analog-conversion-work","tag-how-does-digital-to-analog-work","tag-how-to-digital-analog-tv","tag-is-digital-analogue","tag-is-digital-or-analog-better","tag-resolucao-do-conversor-digital-analogico","tag-what-are-digital-analog-and-hybrid-computers","tag-what-do-digital-and-analog-have-in-common","tag-what-does-a-digital-analog","tag-what-does-a-digital-analog-converter-do","tag-what-does-digital-analog-mean","tag-what-is-analog-digital-watch","tag-what-is-digital-analog","tag-what-is-digital-analog-and-hybrid-computer","tag-what-is-digital-analog-audio","tag-what-is-digital-analog-converter","tag-what-is-digital-analog-signal","tag-what-is-digital-analogue","tag-when-did-digital-replace-analog","tag-which-digital-to-analog-converter-is-best","tag-why-digital-and-analog-ground","tag-will-digital-antenna-work-on-analog-tv","tag-will-digital-phone-work-on-analog-line","tag-will-digital-radio-replace-analogue","tag-will-digital-scanner-pick-up-analog","tag-will-digital-servo-work-analog-receiver"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>How is the digital representation of signals different from analog? - mp4gain.com<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/mp4gain.com\/mp4gain\/how-is-the-digital-representation-of-signals-different-from-analog\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How is the digital representation of signals different from analog? - mp4gain.com\" \/>\n<meta property=\"og:description\" content=\"How is the digital representation of signals different from analog? 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