Philips IS 5022 Mark II, Instruction Manual

Page: 40 / 42

5
SUB
CODE HANDLING
In m o s t studio installations, and where the Sound Enhancer is used to
interface
between
a digital source and a
digital recorder,
subcode han ‑
dling
becomes
relevant. Most digital audio equipment does not solely
provide (digital) audio, but also processes additional digital information
needed for such things as: track number, playing time, remaining time
etc. This additional information is available in the so-called sub. codes.
Most audio interface equipment (sample rate
converters,
effect boxes
etc.)
will
pass
on the audio information but do
n o t necessarily pass
on
the
sub.
codes. The
Sound
Enhancer
offers
in
this
respect,
some rather
unique
features:
5.1
U-CHANNEL (USER DATA)
For
both professional and consumer application (AES/EBU and
SPDIF),
the U-channel bits are copied from the input to the output. Thus the
Sound Enhancer
is in this respect transparent for the U-channel.
5.2
C-CHANNEL (CHANNEL STATUS)
The
Sound
Enhancer complies
with IEC
958 for the codes for the
C-channel,
with
the following exceptions:
5.2.1 Consumer
use (Cinch/RCA)
Digital i n p u t
(SPDIF)
All bits are copied from the input to the output, except:
a bit 0: Consumer use always fixed to “ 0 ”
a bit 2: Copy bit: always fixed to “ 1 ” : no copyrights asserted
a bit 24-27: Sampling frequency as the output sampling-frequency
chosen.
Analog input
If the analog input is selected, the next default values are set:
bit 0: Consumer use: “ 0 ”
bit 1: Audio - Linear PCM - samples: “ 0 ”
bit 2: Copy -
bit: “ 1 ” : no copyrights asserted
bit 3-5: Audio signal emphasis: “000” No emphasis
bit
8-15: | Category Code
General:
all
zeros
bit 24-27:
Sample frequency as chose
(44.1/48 kHz)
bit 28-29: Clock accuracy: “10”:
Level |