Grass Valley NV7512 v.1.3 - Manual (Page 31)

NV7512 Audio Router • User’s Guide 21
1. Introduction
Active Cards
Different input cards can be inter-mixed in a single frame to meet specific switching configuration
needs.
Analog and AES synchronous signals may be converted between analog and digital within the
same router frame. (See
Mixing Analog and Digital on page 5.) Analog or AES synchronous sig-
nals may be routed as stereo or mono signals, but not as AES asynchronous channels.
The following is a list of the different input cards available. Each card is listed by the type of signal
it manages. For your convenience, the part number for each card has been included.
For MADI signals, an optional MADI reference can be used for signals arriving at sample rates
other than 48kHz. (See
MADI Reference on page 67.) In addition, a pair of Sample Rate Converter
sub-modules can installed to support asynchronous signals. (See AES Synchronous (Balanced and
Unbalanced) on page 27.)
The functions of each type of card are described in the proceeding sections. Cards are listed by sig-
nal type supported.
AES Synchronous (Balanced and Unbalanced)
The AES synchronous input card ( EM0488 ) receives balanced or unbalanced incoming signals
through local I/O connectors: DIN 1.0/2.3 for unbalanced signals and DB25 for balanced signals.
The input card receives up to 32 stereo signals. Each signal is transformer coupled. The signal is
then forwarded to a receiver. The receiver automatically determines if the incoming signal sample
rate (48kHz, 96kHz or 192kHz) is valid for the signal input connectors being used. (See
Mixing
AES Signal Sample Rates on page 4.)
Next, the receiver separates the signal into a right channel and a left channel, channel status infor-
mation, and user bits. At that time, the sample rate of the signal is known (48kHz, 96kHz or
192kHz) and sample rate information forwarded with the signal. The signal is synchronized to the
system clock; adding and dropping samples as needed until the signal is synchronized.
Input Card
Number of
Inputs Number of Incoming Signals
per Sample Rate
Part Number
AES synchronous
balanced and
unbalanced 32 stereo
64 mono 32 stereo (64 mono) at 48 kHz
16 stereo (32 mono) at 96 kHz
8 stereo (16 mono) at 192 kHz
EM0488
MADI
synchronous
unbalanced 64 mono 2 streams totaling:
64-channel, 24-bits at 48
kHz
32-channel, 24-bits at 96 kHz
Note: One stream may contain all 64
or 32 channels.
EM0476
Analog 16 stereo
32 mono
16 stereo (rate N/A)
32 analog (rate N/A)
Converts analog input to internal
digital format at 48
kHz
EM0418