Keysight U8903B - Digital Audio Interface; Figure 2-3 U8903 B Digital Generator and Analyzer Block Diagram

Operation and Features 2
Keysight U8903B User’s Guide 55
Digital audio interface
A simplified U8903B digital audio interface block diagram is shown as follows.
Figure 2-3 U8903B digital generator and analyzer block diagram
Signal generation
The digital generator generates all the required waveforms digitally. The digital waveform
data is then streamed to the serial audio transmitter for the DSI output, or to the AES
transmitter for the balanced, unbalanced, and optical output. Finally, the waveform is
routed through the balanced (XLR), unbalanced (BNC), optical (TOSLINK), or digital serial
interface (DSI) output signal connectors to the device under test (DUT).
Measurement
A digital audio signal can enter the digital analyzer through the balanced (XLR),
unbalanced (BNC), optical (TOSLINK), or digital serial interface (DSI) input signal
connector. For balanced, unbalanced, and optical input, the audio signal then passes
through the AES receiver. For DSI input, the audio signal then passes through serial audio
receiver. The audio signal is sent to the digital analyzer. Inside the digital analyzer, the
digital signal can be optionally passed through a combination of up to five digital filters,
one each from the low pass, high pass, weighting, deemphasis, and sample rate filter
groups before sending it to the measurement section.
AES
Serial audio
DIGITAL GENERATOR
AES
Serial audio
DIGITAL ANALYZER
Serial audio
AES
25-pin female D-SUB connector
BNC
XLR
TOSLINK
BNC
XLR
TOSLINK