Signal types and rates, Mixing aes signal sample rates, Signal – Grass Valley NV7512 v.1.3 User Manual
Page 14: Types and rates, Introduction
4
Rev 1.3 • 10 Oct 08
1. Introduction
Signal Types and Rates
Signal Types and Rates
The NV7512 supports AES, MADI and analog signals. Analog signals are converted to digital with
a sample rate of 48kHz for internal routing. Outgoing digital audio signals can be converted to ana-
log for distribution. In addition, all stereo signals are separated into left and right channels for rout-
ing as mono signals. Mono channels can be recombined to create new stereo signals.
The following table lists the sample rates and how many signals at each rate an input card or output
card can support. Each signal type requires a specific input or output card. For a description of each
card and corresponding card part numbers, see
on page 20 and
For MADI signals, an optional MADI reference can be used for signals arriving at sample rates
other than 48kHz. (See
on page 67.) In addition, a Sample Rate Converter sub-
module can be installed to support asynchronous signals. (See
MADI Asynchronous Sample Rate
Converter Sub-Module
on page 23.)
Each signal requires a specific type of connector. Connectors are housed on backplanes installed on
the back plate. For a list of signals and corresponding connector types and backplanes, see
Mixing AES Signal Sample Rates
The NV7512 can support three incoming sample rates for AES synchronous signals: 48kHz,
96kHz or 192kHz. The rate of the signal determines how many signals are supported and through
which connectors the signal may be received.
The router receives a maximum of 32 stereo signals through coaxial connectors housed on I/O
backplanes. (See
on page 12.) The 32 signals are divided into four sets of 8 signals
each. Each of the four sets can have a different sample rate totalling up to 192kHz for all four sets.
The faster the sample rate, the fewer the number of signals the input card can support. Similarly, the
sample rate determines how many and which connectors on the backplane are used to receive the
signals.
Signal Type
Sample Rates
Supported
One Input Card
Supports
One Output Card
Supports
AES
synchronous
(balanced and unbalanced)
48
kHz
96
kHz
192
kHz
32 stereo sources at 48
kHz
16 stereo sources at 96
kHz
8 stereo sources at 192
kHz
32 stereo destinations at
48
kHz
, 96
kHz
or 192
kHz
(any combination of rates)
MADI synchronous streams
(unbalanced)
48
kHz
96
kHz
2 streams totaling:
64 channels, 24 bits at
48kHz
32 channels, 24 bits at
96kHz
Note: One stream may
contain all 64 or 32
channels.
2 streams;
2 optional AES reference
outputs, timed to the output
data sampling rate.
Note: Reference not used
for inputs because signals
converted to 48
kHz
for
internal routing.
Analog
48
kHz; 25 bits
16 stereo sources
Converts analog to internal
digital format.
16 stereo destinations
Converts internal digital
format to analog.