It marks them analogic and numerical
1) It marks them analogic simple:
It is obtained from a transducer which it transforms a information of one given nature in marks them electrical worker. It marks them analogic of greater importance in the applications are marks them sonorous and it marks them of image.
2) It marks them sonorous:
It comes generated from a transducer acusto-electrical worker (..microfono) and is used from elettro-acoustic transducers (..altoparlanti), come characterized the following associate bandwidths:
to) it marks them telefonico 300hz - 3400 hz
b) it marks them audio normale 50 hz - 4500 hz
c) marks them audio musicale 30 hz - 12 Khz
d) it marks them audio to high fedeltà 30 hz - 15 Khz
3) Time of image:
The image is the timeT im necessary to the sensor in order scandire all and predisporsi to one new scansion, its inverse one is the image frequency. European standard: the image frequency is 25 Hz while the picture frequency is of 50 Hz.
4) Time of line:
It is the H time necessary to the sensor in order scandire a line of the image and predisporsi to one new scansion, its inverse one is the line frequency.
5) Number of righe:
It is the relationship between the time necessary scandire the image and the time necessary scandire a line, since these two times contain both necessary the dead times to the optical reader for predisporsi to one new scansion, is had that the number of lines is greater of the number of effective lines in which is decomposed the image. For the European standard the number of lines is 625 while the effective number is 585.
6) Distance of sampling:
It is the distance between two adjacent lines, it is worth 
where h it is the height of the image and Nand the number of effective lines.
7) Impulses of sincronismo:
Immessi come during the dead times of line and picture to the aim to maintain the sincronismo with the receiver.
8) It marks them to colors:
E' composed from marks them of luminance and from two it marks them of crominanza.
9) numerical Flow:
To one numerical sequence xq(n) a logical entity z q (n) corresponds in waybiunivococalled numerical flow, constituted from M-nari symbols that are succeeded with the same temporizzazione kT of the sequence.
10) Time of symbol:
It is the T time which a symbol of the numerical flow corresponds, its inverse one is said symbol rhythm.
11) intersimbolica Interference:
It is had when it marks them numerical comes transmitted in real channels that they determine an increase of the impulse with consequent interference between two consecutive symbols of the numerical flow.
12) It marks them sincrono:
It is marks them numerical for which the temporal distance between two consecutive symbols remains unchanged in the time, to the contrary of how much it happens for marks them asynchronous.
13) analogic-digita Conversion them:
Consta of the following passages:
to) sampling of it marks them analogic to a double frequency regarding the maximum contained frequency in marks them
b) quantization of the champions
c) codifies