Sony NW-MS9 operating instructions Glossary, Check-in/Check-out, Bit rate, Sdmi

Glossary (continued)

SDMI

SDMI which stands for Secure Digital Music Initiative, is a forum that consists of over 130

companies in the fields of recorded audio content, computers, and consumer electronics,

dedicated to developing an integrated method of copyright protection technology that can be used worldwide

SDMI	is	working	to	create	a	framework	for preventing	improper	usage of audio	files and	to
promote		legal	music	distribution		services	The copyright	protection	technologies	“OpenMG”	and
“MagicGate”			are based upon			the SDMI	standard

“Check-in/Check-out”

Check-out

is

to

transfer

music

files

from

a

personal

computer

to

an

external

device/media

(such

as Network

Walkman)

Returning

checked-out

music

files

to

the

same

computer

is to

check-in

(You

cannot

move

checked-out

music

files

to

another

computer

)

You

can

check-out

a music

file,

check

it

back

in,

and

then

check

it

out

again

an

infinite

number

of

times

The

SDMI

rules

provide

that

up

to

four

copies

of

a

music

file

can be

checked-out

at

one

time

OpenMG

employs

a

method

whereby

three

copies

of

a

song

can be checked-out

simultaneously,

while

the

fourth

copy

is

maintained

as

a

“master”

on

your

PC

If three

copies

of

the

same

song

are

checked-out

at

a given

time,

one

copy

of

the

song

needs

to be checked-m

to

the

computer

in

order

to

create

an

additional

check-out

Bit rate

Indicates the data amount per second The rate is reflected in bps (bit per second)

In OpenMG Jukebox, the bit rate for recording an audio CD or converting MI’3 and WAV format

audio files into ATRAC3 format can be chosen from 132 kbps/105kbps/66kbps105 kbps means

105000 bits of information per second If the bit rate is large, that means a large amount of

information is used to play music Comparing music of the same format, a 105 kbps data offers better sound quality than 66 kbps data, and 132 kbps data offers better sound quality than 105

kbps data However, audio files in formats such as MI’3 have different encoding methods, and

thus sound quality cannot be determined by simply comparing the bit rate

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