{"id":1553,"date":"2020-07-09T15:52:17","date_gmt":"2020-07-09T15:52:17","guid":{"rendered":"http:\/\/mp4gain.com\/mp4gain\/?p=1553"},"modified":"2020-07-09T15:52:17","modified_gmt":"2020-07-09T15:52:17","slug":"analogue-and-digital","status":"publish","type":"post","link":"https:\/\/mp4gain.com\/mp4gain\/analogue-and-digital\/","title":{"rendered":"ANALOGUE AND DIGITAL"},"content":{"rendered":"

The essential<\/p>\n

Analog and digital are two methods of transporting and storing data. (audio, photo, video …). Analog was born with the onset of electricity, while digital appeared more recently in the computer age.<\/p>\n

\"Analogue<\/p>\n

The analogical principle is to reproduce the signal to be recorded (audio, video …) in a similar way in a medium (magnetic in general). For example, when recording an audio signal in an analog system, the signal present on the tape will follow the same amplitudes (“the same curve”) as the sound wave (with more or less fidelity): the characteristic pressure variations of a sound wave will result in variations of an electrical signal. Therefore, the electrical amplitude of the analog signal will be the more or less faithful image of the signal to be recorded (audio, video, etc.)<\/p>\n

\"analogue<\/p>\n

In digital, the analog signal to record becomes digital thanks to an analog> digital converter. After this conversion, the signal is just a sequence of “0” and “1”, that is, a signal with two amplitudes instead of infinity in analog.<\/p>\n

Once in this form, the signal can be copied and transmitted losslessly because instead of transporting a signal whose amplitude should faithfully vary from the original, it carries a signal consisting of only two amplitudes (for example, 0 = 0 volts and 1 = 5 volts). So when a parasite disturbs an analog signal, digitally this parasite will have no effect: for example, a parasite that adds 0.2v disturbance will deteriorate an analog signal, while this same parasite on a digital signal will have no effect because 0v + \/ – 0.2v will always be considered = “0”.<\/p>\n

Therefore, the digital signal is an analog signal made up of two possible levels (for example, “0” = 0v and “1” = 5v) and when the analog signal moves away from these two voltages, it does not matter because all the signals close of 0v will be considered = “0” and any signal close to 5v will be = “1” with a voltage threshold between the two resulting in exceptional immunity against parasites and exemplary ease of making perfect copies (clones) of this signal type.<\/p>\n

After digital transport and storage, any signal (video or audio) must return to its original analog form. For example, an audio signal will be converted from digital to analog and then amplified; in fact, our ears cannot hear digitally! ! !<\/p>\n

It should be noted that digital is only used (in the case of an audio or video signal) for the transport and storage of data.<\/p>\n

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