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24
PAM1 MK2
User Handbook Issue 1
To exit
Dolby Decoding Mode,
push and hold the encoder for several seconds and the
PAM1
will revert to the
Top Level Mode
. The encoder can be rotated to move the
‘Hear Box’
and
select another signal from the
top level screen
.
2.10.1
Dolby E Timing and Rate Information
The
Data Screen
of the
PAM1
displays extended information about any decoded
Dolby E
and
Dolby Digital
sources. This shows the frame rate of the Dolby encoded signal and its timing
relative to a video source where available.
For AES inputs, the frame rate information is displayed as a minimum:
Dolby E 20bit 29.97
- or -
Dolby E 16bit 25Hz
For embedded Dolby E sources, the start line position is displayed in the format:
Dolby E 16bit L11
The image below shows an example of a 20 bit
Dolby E
signal embedded at line 507
This functionality is also extended to mixed sources. If an AES source is selected for monitoring,
whilst a video source is selected with the same frame rate, then the display will give the
approximate line position of the AES
Dolby E
start relative to the video. This allows the timing of
an AES signal to be checked either before embedding or after extraction (note the embedder /
extractor delays need to be accounted for in a system). For sources of different frame rates, the
display reverts to the
Dolby E
frame rate. The video frame rate is already displayed on the top
level menu.
Dolby Digital
and Digital Plus
sources are also identified, although no further information is
provided without a decoder.
All of the above functions are available both with and without on-board
Dolb
y decoding, providing
the source has a correctly formatted
SMPTE 337M
header
