Pure Evoke-1 - Manual (Page 18)

14
Guide to digital r
adio
Your EV
OKE-1 enables y
ou to receiv
e and listen to D
AB radio prog
rammes.
Digital
A
udio Broadcast (D
AB) uses digital signals rath
er than
traditional analogue signals enabling near CD-quality audio with vir
tually interference-free reception.
D
A
B also enables broadc
asters to transmit
additional data along with the audio including other audio channels,
text and in the future,
perhaps computer data and imag
es.
Digital radio is broadcast as g
roups of data called ensembles or multiplexes.
Each multiplex can contain a number of stations (
ser
vices) and
each station contains a primar
y ser
vice and can contain
secondar
y ser
vices as illustrated in the follo
wing diag
ram.
Each multiplex is transmitted in a set frequency rang
e and
receiv
ed b
y y
our EV
OKE-1 for decoding
. Y
o
ur EV
OKE-1 enables
you to receiv
e multiplexes broadcast in
frequency band III
(174-240 MHz) and store the ser
vices in each multiplex for
you to access.
The number of multiplexes y
ou receiv
e will
va
ry
depending on y
our location.
Band III is divided into 41
channels identified as 5A to 13F
.
Each channel can contain
one multiplex.
Channels allocated to the UK are in the rang
e
11B to 12D
.
Multiplexes and stations ha
ve
labels (names) w
hich are used
to identify them.
Instead of needing to kno
w a par
ticular
frequency to listen to y
our fa
vourite broadcast y
ou can simply
select the station name.
Secondar
y ser
vices and additional
data such as text containing prog
ramme or multiplex
infor
mation are also easily accessed using y
our EV
OKE-1.