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With analog reproduction systems, there is a continuous stream of information from the sensor to the reproducer For example, when Edison invented his phonograph, the sensor was a large acoustic horn that wiggled a needle in response to variations in air pressure gathered by the horn The continuous wiggling could be recorded on a wax cylinder The groove in the wax would be analogous to the variations of air pressure detected by the horn If the same needle were then excited by the recorded wiggles in the wax, the horn would vibrate in response to the movement of the needle as it followed the groove in the wax Air pressure variations, the same as those that were recorded, would be recreated, and ears could hear these as sound.



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Because of the low-voltage, low-current nature of a single photovoltaic module connected to a pump, many region s electrical codes will not require a fuse, breaker, or other disconnection device; however, check your local regulations to be on the safe side.

If the recording process were perfect, there would be no way that the ear could tell the difference between a real sound and a recorded and reproduced sound But the recording process isn t perfect..

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The needle can only move so fast, the horn is only sampling the air pressure variations present in the room, and the movement of the needle along the surface of the wax produces its own noise The important thing to notice is that the groove in the wax is actually a continuous measurement of air pressure variations received by the recording horn It reproduces an analog of the original sound With digital reproduction systems, the aim is to make those measurements discrete values If you measure often enough and with enough precision, you can effectively reproduce the continuous variations in light intensity or air pressure that you need to create a convincing picture or sound.

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To take an absurd example, if you took the wax groove made by Edison s phonograph and measured the depth of the groove every hundredth of a millimeter along the length of the groove using a measuring device that measured with fine enough gradations, then wrote the measurements down in a book, you would have performed an analog to digital conversion! The list of measurements in your book would be a digital representation of the sound you recorded You could photocopy the pages and the copy would be an exact representation of the sound you recorded You could substitute every occurrence of the digit 2 with the digits 22.

Flexible plastic tubing and jubilee clips are infinitely easier to work with than copper pipe and solder. You will want to provide some sort of mechanical protection for your cable to ensure that it does not become chafed, or cannot easily be damaged by gardening activities such as digging. Encase the pipe in a hard plastic pipe, or mount it above ground where it can clearly be seen.

When you sent this to your friend, if he knew to substitute every pair of digits 22 with a single 2, he could exactly recover the digital representation of the sound you recorded, whereas somebody who got your page of measurements, who didn t know about the substitution, would have little chance of recovering your original measurements You would effectively have encrypted the information and managed the rights to reproduce the original by the act of telling only your friend how to decrypt the numbers.

IIS will return the page with the root element of the DiffGram:

Now, if you had a machine that could wiggle a needle very precisely, according to a series of numerical measurements you punched into it, such that the excursion of the needle was proportional to the number you punched in, and if this machine s needle was connected to a big acoustic horn, then if the wiggles were reproduced, number by number, at the right rate, the horn would vibrate and reproduce a sound indistinguishable from the one originally recorded in the wax groove The machine would take a list of numbers and produce air pressure variations proportional to those numbers It would be a digital-to-analog converter All digital media work this way Measurements of light intensity or air pressure are taken fast enough and with sufficient precision not to miss any important detail and written down somehow These numbers are then sent somewhere else.

One you have satisfied yourself that your pump and module work together satisfactorily, you will need to install your feature.

A machine on the receiving end converts the list of numbers, at the right rate, into variations of light intensity and air pressure identical to those originally recorded..

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In case of an error, you might get a message similar to this one:

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