Signals, A note about aes signal types – Grass Valley CRSC v.3.2 User Manual
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Tutorials
Routing Overview
Signals
Many signal sources (and receivers) have several signal types. In the CR Series, routers can switch
one or more signal types.
Video signals are classified as digital (i.e., 3Gig, HD, SD) or analog. Audio signals are classified as
digital or analog and also stereo or mono. For compact routers, digital audio is AES3id (AES for
short). There are several different digital video formats and two analog video formats. Video
signals might or might not also carry audio signals. Audio carried in a video signal is called
embedded audio. Digital video can embed (carry) up to 16 individual AES audio channels.
Analog signals are not directly compatible with digital signals, but devices that convert one to
the other are available.
The different digital formats are also not compatible, but an HD router will also route SD signals
and a 3Gig router will also route HD and SD signals. Most video monitors recognize several
different formats and adjust themselves to display the format they receive. See
on page 133 for more information.
A Note About AES Signal Types
AES matrices are different from other matrices. AES signals are numbered as stereo pairs. A
16×16 AES router has a 32×32 matrix. A 32×32 AES router has a 64×64 matrix.
If the AES router detects a video reference signal, the router operates in synchronous mode.
Otherwise, it operates in asynchronous mode.
•
Asynchronous Mode
In asynchronous mode, AES ‘takes’ occur in “stereo” pairs only. AES channels 1 and 2 are a
pair, 3 and 4 are a pair, and so on. For example, you can take input pair (1,2) to output pair
(5,6).
You cannot choose (even, odd) pairs. For instance, you cannot take (2,3) to any output. You
cannot take any input to an (even, odd) output.
•
Synchronous Mode
When an AES router is in synchronous mode (i.e., it has a valid video reference signal), the
router’s level type is ‘Synchronous AES Mono’.
AV
AA
AES
CR6464-AES
SD
HD
3Gig
PR
Analog Video or Timecode
Analog Audio or Timecode
Synchronous AES Mono
Asynchronous AES
a
SD Digital Video
HD or SD Digital Video
3Gig, HD, or SD Digital Video
Machine Control Reverse
a. Asynchronous AES applies only to the CR6464-AES.