Analogue and Digital Signal explanation. As well as information on Digital Imaging

1. FILM AND VIDEOVARSHINI
YOGAESWARAN

2. The word Analog or Analogue recording comes from the Greek, ana “according to”
and logos “relationship”.
An analogue signal is any constant/continuous sign for which the time differing feature (variable) of the sign is a
representation of some other time changing quantity, i.e., analogues to another time shifting signal. For instance, in an
analogue audio signal the quick voltage of the signal shifts continuously with the pressure of the sound waves. It contrasts
from a digital signal, in which the continuous quantity is a representation of a sequence of discrete qualities which can just
go up against one of a limited number of values. The term analogue signal typically alludes to electrical signals; be that as it
may, mechanical, pneumatic, hydraulic, human speech, and different systems may likewise pass on or be viewed as

3. • Analogue recording is a technique utilized for the recording of analogue signs
which, among numerous conceivable outcomes, permits analogue audio and
analogue video for later playback.
• Analog recording techniques store signals as a continuous signal in or on the
media. The signal might be put away as a physical texture on a phonograph
record, or a change in the field strength of a magnetic recording. This is unique
from digital recording which digital signals are spoken to as discrete numbers.

4. DIGITAL SIGNALS
• Digital signals are a sequence of pulses comprising of only two
states which are ON (1) or OFF (0). There are no numbers or
values in between.
• Film can be a "chemical" or digital procedure.
• When it is a chemical procedure a light sensitive silver halide
emulsion covered on a film base is exposed to light in a
camera. This makes a latended picture which is made visible
by rising the film into a chemical mixture which we allude to
as a ‘developer’. A print can then be made by projecting the
picture from the film onto sensitized photographic paper and
processing the paper through various chemical baths.

5. • A motion picture projector is an opto-mechanical gadget for showing motion picture film by projecting it onto a
screen.
• Digital imaging does not necessitate chemicals. Digital pictures are caught utilizing varieties of photo sensors
and these pictures are then handled by specialised programming. Prints can be made through for customary
projection. On the other hand the film can stay in a digital form for digital projection.
• In regular talk individuals normally allude to chemical photography as analogue to contrast it with the digital
procedure. Here, analogue is alluding a sign whose output is relative to the input.

6. • A great example for analogue in traditional photography is a light meter where
light falls on a photograph cell which produces an electrical current moving a
needle over a scale. The brighter the light is the more the needle moves. Oddly,
the sensor in a digital camera is likewise analogue: every one of the millions of
pixels which constitute the sensor is a light sensitive photo cells creating little
electrical currents which is reacting to light. The brighter the light the more
strongly the current.

7. Film Chemistry: "The Alchemist In
Hollywood" 1940 ACS American
Chemical Society (VIDEO)