Keysight U8903B - Bluetooth Audio Interface; Figure 2-4 U8903 B Bluetooth Generator and Analyzer Block Diagram

2 Operation and Features
56 Keysight U8903B User’s Guide
Bluetooth audio interface
A simplified U8903B Bluetooth audio interface block diagram is shown as follows.
Figure 2-4 U8903B Bluetooth generator and analyzer block diagram
Signal generation
The digital signal processing (DSP) generates all the required waveforms digitally. The
digital waveform data is then streamed to the U8903B Bluetooth module in which the
audio will be encoded and converted to the RF interface. Finally, the waveform is
transmitted to the Bluetooth audio devices through the RF1 connector. The RF1 connector
is the default port and the RF2 port can be selected in the U8903B’s GUI.
Measurement
The audio signal enters the Bluetooth analyzer through the RF1 connector. The audio
signal then passes through the U8903B Bluetooth module in which the audio will be
decoded and converted to the digital interface and sent to the Bluetooth analyzer. Inside
the Bluetooth 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.
BLUETOOTH GENERATOR
RF1
RF2
RF1
RF2
Bluetooth module
BLUETOOTH ANALYZER
Bluetooth module