APCSP Notes
, Unit 1 :
Digital Information
(0cr1)
-
Computers bit binary
-
represent data as ,
in number system
8 bits 1
byte
-
:
Overflow number stored variable
bigger
being what
-
in then the
:
is computer can
handle
↳ Could result in truncation high to I numbers
capping all numbers or
Wrap number around (higher number + back to 1)
Floating Point Representation similar to
scientific butu f
binary Used
by
-
:
notation computer
, .
to store date
↳ 1727 1 .
75729 1 .
572 "..
.
,
Round
off Error
error/out off bits
-
:
errors in number
representation be computer rounding
c ↑ bits used = A
precision
ASCII
Encoding binary
-
number chart letter.
conversion
for each
:
↳ "A" =
1000001 (65) ,
"a" :
97
4) But it's limited to English+
, just capable of just 128 Sits
chesadainl)
Unicode : universal character set that assigns to each character
-
number
binary.
↳
encoded
by UTF-8 into
-Analog = continuous stream of varying data , infinitely detailed
↳
Computers only store
digital data
(finite data in
binary
"Need to convert
analy
to
digital when store in computer
1)
Sampling : convert infinite stream -
finite sequence
2) Quantisation :
values in
sequence are
approximated
3) Encoded convert to
binary for
:
storage
3 Later
computer reconstructs these digital data into to file
,
analy display original
, Unit 1 :
Digital Information
(0cr1)
-
Computers bit binary
-
represent data as ,
in number system
8 bits 1
byte
-
:
Overflow number stored variable
bigger
being what
-
in then the
:
is computer can
handle
↳ Could result in truncation high to I numbers
capping all numbers or
Wrap number around (higher number + back to 1)
Floating Point Representation similar to
scientific butu f
binary Used
by
-
:
notation computer
, .
to store date
↳ 1727 1 .
75729 1 .
572 "..
.
,
Round
off Error
error/out off bits
-
:
errors in number
representation be computer rounding
c ↑ bits used = A
precision
ASCII
Encoding binary
-
number chart letter.
conversion
for each
:
↳ "A" =
1000001 (65) ,
"a" :
97
4) But it's limited to English+
, just capable of just 128 Sits
chesadainl)
Unicode : universal character set that assigns to each character
-
number
binary.
↳
encoded
by UTF-8 into
-Analog = continuous stream of varying data , infinitely detailed
↳
Computers only store
digital data
(finite data in
binary
"Need to convert
analy
to
digital when store in computer
1)
Sampling : convert infinite stream -
finite sequence
2) Quantisation :
values in
sequence are
approximated
3) Encoded convert to
binary for
:
storage
3 Later
computer reconstructs these digital data into to file
,
analy display original
