Hi, my name is Kah Meng Chew and I'm an engineer at Keysight Technologies.
Today, I'm going to introduce the new U8903B Performance Audio Analyzer,
the next generation audio analyzer from Keysight Technologies.
The new U8903B offers users an audio test solution that is configurable to meet their specific audio application needs.
New features include configurable measurement channels,
added speech voice quality assessment capability and higher product specifications.
Now let’s take a more in-depth look at these features.
The U8903B audio analyzer can be configured to 4 or 8 analog analyzer channels.
The instrument is capable of simultaneous measurement on all channels,
making the U8903B the ideal choice for multichannel systems such as 5.1 or 7.1 surround sound.
Users can view the measurements simultaneously in a single screen, and in real time.
Here is the rear panel view of the audio analyzer equipped with 6 input channels and two inputs channels in the front.
U8903B comes with industry’s standard interfaces: AES3/SPDIF and Digital Serial Interface (DSI).
The U8903B also supports multiple DSI formats, such as I2S, Left Justified, Right Justified and DSP.
These formats are suitable for most digital audio design and verification applications.
The U8903B DSI interface comes with completely variable logic I/O levels between 1.2 V and 3.3 V,
As you see here in the DSI configruation, users can use the voltage between 1.2,
and you can customize your own voltage level as well.
This offers the ultimate in compatibility with current and future devices.
The in-built test sequencer allows users to create flexible
and easy-to-use test sequences that automates testing and provides test reports. 0:02:28.510,0:02:25.210 This function removes the need to write complicated programming code or to purchase an additional external controller.
Users can setup and define the types of measurements as well as define Pass/Fail decisions,
reducing test development time as well as test time for the device-under-test.
The U8903B audio analyzer now offers the ITU-T standard
perceptual objective listening quality assessment, known as POLQA,
as well as perceptual evaluation of speech quality, PESQ
POLQA and PESQ works by comparing a degraded (usually by typical network transmission interferences)
or processed signal to the original reference signal.
The perceptual differences between the two signals are then rated based on the mean opinion score (MOS),
which uses a scale from 1, which is bad, to 5, which is excellent.
Now the U8903B has completed the voice quality test, and let's look at the results.
As you can see, this is the mean opinion score, MOS score, which is rated at 3.28.
This is considered very good.
The U8903B comes with extremely low residual distortion and noise.
The residual distortion is < –110 dB, enabling the measurement of the most demanding devices.
This performance is available for up to 8 channels simultaneously.
As you can see here, this is an FFT plot showing the residue distortion.
For component and IC testing, the U8903B comes with a wide bandwidth option,
expanding the upper limit of the measurement bandwidth to 1.5 MHz
with a 24 bit resolution and 1 million point FFT.
This expanded bandwidth allows the audio analyzer to maintain high accuracy
even when monitoring Class D amplifiers or switching supplies,
which often produce signal spikes far outside the bandwidth limits of conventional audio analyzers,
typically at 100 KHz or less.
This screenshots shows an FFT plot of a 300 kHz source
and the U8903B's unique ability to measure up to 4th harmonics.
I have just demonstrated some of the exciting features in the new U8903B Performance Audio Analyzer.
Feels free to contact our representative for a demo.
For more information on the U8903B please visit our product web page.
Thank you.