Legacy Bluetooth® Module for APx Series Audio Analyzers
Integrated Bluetooth Audio Test Solution

Today, engineers are limited to subjective listening tests, or to connection through components or systems that may subject the signal to unspecified and uncontrollable gain, distortion or sample rate conversion. APx’s built-in Bluetooth radio and Bluetooth stack allow engineers to measure their Bluetooth devices directly, eliminating the uncertainty and inconvenience of adapters and making Bluetooth audio test faster, easier and more reliable.

Note: This page discusses the Legacy Bluetooth module for APx audio analyzers. Audio Precision also has the newer APx Bluetooth Duo module for use with v4.5 APx500 software.

Integrated Bluetooth control for reliable wireless connectivity
With APx, all Bluetooth controls are integrated into the analyzer software. In addition to standard commands like pairing or opening a connection, it’s easy to switch between profiles and roles on the fly, specify a custom device class, connect with a preferred sample rate or codec, or force open a SCO without ringing. For deeper protocol analysis, a link key is available to cut and paste into a Bluetooth packet sniffer.

Wide Band Speech Support
Bluetooth Wide Band Speech (HPF 1.6 profile, mSBC codec) provides increased bandwidth for speech signals, allowing manufacturers to significantly improve the audio quality of headsets and other audio accessories used for communications.

Comprehensive audio test from the recognized standard
Once connected, every audio characteristic can be measured. Key features include 30+ one-click audio measurements (including all standard weighting filters), 1.2M point FFTs, real-time oscilloscope monitoring, custom reports, statistical calculations, and quasi-anechoic acoustic measurements. With 21 measurements in one second, the APx multitone analyzer is ideal for Bluetooth production test.

Isolation of audio stages
With APx, nearly any combination of input and output can be measured directly: Bluetooth, analog (2, 4, or 8 channels), AES3 or S/PDIF digital, I2S digital serial, PDM and HDMI are all available.

Quasi-anechoic acoustic test
Most Bluetooth devices have Bluetooth at one end of the audio chain and a transducer at the other. APx’s Acoustic Response measurement makes 14 key acoustic measurements in 3 seconds and uses an energy time curve to find the ideal time gate quickly and easily.

Perceptual audio tests
Obtain MOS values with the Perceptual Audio (PESQ) Option for APx500. The APx Bluetooth options acts as an ideal transmitter or receiver, allowing the device under test to be accurately assessed.

APx Bluetooth Legacy Data Sheet

Bluetooth Core Version

Profiles / Roles Supported
A2DP Source; A2DP Sink; HFP Audio Gateway; HFP Hands-Free; HSP Audio Gateway; HSP Headset; AVRCP Controller

Codecs supported

RF Connection
Type N female jack. Antenna with
N to SMA adapter included.

RF Input Impedance
50 Ω typical

RF Output Impedance
50 Ω typical

RF Power
0 dBm typical, 4 dBm maximum

RF Sensitivity (0.1% BER)
–81 dBm Typical