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APx500 User’s Manual 129

Bluetooth I/O

Introduction

The APx Bluetooth Duo option (page 9) is a hardware

module available for the APx modular analyzers (the

APx555, and the APx525 and 585 families of analyz-

ers, including the APx582). It provides Bluetooth wire-

less technology source and sink interfaces.

The APx Bluetooth profiles support audio in a lower-

quality (voice) mode (the HFP and HSP profiles) and in

a higher-quality (music) mode (the A2DP profile).

See more About Bluetooth on page 140 and Using

Bluetooth in a Sequence on page 555. See More

About Supported Bluetooth Profiles on page 141.

This chapter discusses operation of the Bluetooth Duo

option.APx500 version 4.5 supports the Bluetooth

Duo option, and also provides support for the legacy

Bluetooth modules. Operation of the legacy Bluetooth

modules is discussed in Chapter 18.

Identification

The most obvious difference between the legacy Blue-

tooth modules and the Bluetooth Duo module is the

number of external antennas: the legacy modules

have one; Bluetooth Duo has two.

The Bluetooth Duo module carries the model number

229, and is identified in the Help > About product

components list as Bluetooth Duo Module.

See more About Bluetooth on page 140, and Using

Bluetooth in a Sequence on page 555. See More

About Supported Bluetooth Profiles on page 141.

The Bluetooth Monitor

The status of a number of current Bluetooth settings

is shown in the Bluetooth Monitor. Additionally, Blue-

tooth actions, settings and utility functions are avail-

able through a context menu (right-click in the

Bluetooth Monitor display.) See Bluetooth Monitor on

page 36.

Bluetooth Discovery, Pairing and Con-

nection

Bluetooth connections require successful radio fre-

quency (RF) communication between the APx ana-

lyzer and the DUT, and successful device handshaking

through device discoverability, pairing and connection

protocols. Data transfer is encrypted and must be

authorized by the exchange of link keys, and personal

identification number (PIN) codes may be required.

Bluetooth Settings are Global

Bluetooth settings are unique in APx500, in that they

are global. This means the settings made in the Blue-

tooth Settings dialog affect the entire project: all mea-

surements, all signal paths.

Source, Sink, Output and Input

When the APx Output Configuration is set to Blue-

tooth, the instrument can transmit audio using the

A2DP Source profile, the HFP Audio Gateway profile, or

the HSP Audio Gateway profile. When the APx Input

Configuration is set to Bluetooth input, the instrument

can receive audio using the A2DP Sink profile, the HFP

Hands Free profile, or the HSP Headset profile.

There is one case where you are allowed to output

audio and input audio simultaneously: Set the APx

Profile to A2DP Sink, HFP Hand Free AVRCP Control-

ler. Connect to the DUT using the HFP Profile. Since

HFP is a bi-directional link, you can both send and

receive audio.

Summary of content (17 pages)

PAGE 1
7 Bluetooth I/O Introduction The APx Bluetooth Duo option (page 9) is a hardware module available for the APx modular analyzers (the APx555, and the APx525 and 585 families of analyzers, including the APx582). It provides Bluetooth wireless technology source and sink interfaces. The APx Bluetooth profiles support audio in a lowerquality (voice) mode (the HFP and HSP profiles) and in a higher-quality (music) mode (the A2DP profile).
PAGE 2
Chapter 17: Bluetooth I/O Output Configuration: Bluetooth This Signal Path Setup I/O selection enables output of audio from the APx generator to a Bluetooth device under test, using Bluetooth radio frequency (RF) transmission. tion. See More About Supported Bluetooth Profiles on page 141. Disconnect If the APx is already connected to a Bluetooth device, you can click the Disconnect button to terminate the connection. Actions Click Actions to open the Bluetooth Actions dialog.
PAGE 3
Chapter 17: Bluetooth I/O Edit Channel Labels In the Channel Labels dialog you can rename the input channels with names of your choice. See page 56. These settings are project-wide, but can be overridden for any measurement result. To set project colors, click the Project Colors... button in the Labels dialog, or go to the Project/Sequence Properties dialog, Colors tab. See Setting Graph Colors and Styles on page 30. result referencing audio from the unlocked input will display an “----” (invalid) result.
PAGE 4
Chapter 17: Bluetooth I/O Bluetooth settings dialog for Bluetooth Duo Bluetooth Settings dialog for Bluetooth Duo, shown in the A2DP Source, HFP Audio Gateway, AVRCP Target profile set. This topic explores Bluetooth Duo settings dialog. The legacy Bluetooth settings dialog is discussed beginning on page 148. This dialog provides settings for Bluetooth discovery, pairing, connection and other configuration.
PAGE 5
Chapter 17: Bluetooth I/O Discovery Auto Discoverable/Pair/Connect When this is selected (the default), the APx Bluetooth Option is discoverable by remote Bluetooth devices. If the remote device initiates pairing, the APx will pair. If the remote device initiates connection, the APx is available to connect for the profiles checked here. here vary with Source or Sink (Target or Controller) settings.
PAGE 6
Chapter 17: Bluetooth I/O will not be available on the connection menu. These further options are available: Codec Settings... This button opens the A2DP Codec Settings dialog. See page 135. Clock Recovery Clock Recovery enables or disables the sink clock recovery algorithm. See page 136. •Fixed Fixed (the default) sets the A2DP sink sample rate to the negotiated rate. •(Auto) Auto enables the A2DP sink clock recovery algorithm. Report A/V Sync Delay Report A/V Sync Delay to the connected Source device.
PAGE 7
Chapter 17: Bluetooth I/O select the device in the Current Devices List, and click Pair. A Pair Bluetooth Device dialog box will open. ware is correct for the APx500 version. If the firmware requires updating, the update will begin immediately and a progress dialog will be displayed. The update may take a few minutes. If Check for Firmware Updates at Application Start is unchecked, the APx500 application will not check for updates at launch.
PAGE 8
Chapter 17: Bluetooth I/O APx as A2DP source: •48 kHz •44.1 kHz •32 kHz rate drift between source and sink. Ideally, this compensation is unnoticed by the listener, providing a pleasant listening experience; it will, however, create small but measurable sample rate and audio frequency variations. •16 kHz APx as A2DP sink: •48 kHz •44.1 kHz A/V Sync Delay A/V Sync Delay AV Sync Delay features are not supported by the Legacy Bluetooth Option.
PAGE 9
Chapter 17: Bluetooth I/O Edit Device Class This dialog will generate a Bluetooth Device Class hex code from your selections. media player such as a phone. APx uses AVRCP Commands to control the remote media player. When the AVRCP Controller profile is selected, the Playback Status Event checkbox on the Bluetooth Settings panel allows you to enable or disable Playback Status. This setting is enabled by default. Toggling this setting will disconnect any active connection.
PAGE 10
Chapter 17: Bluetooth I/O volume to the rendering device (speaker or headphones). The rendering device responds with a notification of the current absolute volume level. APx supports features of Absolute Volume Control in both the AVCRP Controller (A2DP sink) and Target (A2DP source) profiles. AVCRP Controller profile In the AVRCP Controller profile, APx acts as a A2DP rendering device (a sink such as a speaker or headphone), receiving an audio stream from a remote media player.
PAGE 11
Chapter 17: Bluetooth I/O AVRCP generator commands are only acted upon when the active measurement has a generator with an ON/OFF button, and the generator is not disabled. Process for discovery, pairing and connection Commands •The AVRCP command Play turns the generator On •The AVRCP command Pause turns the Generator Off •The AVRCP command Stop turns the Generator Off, and stops A2DP streaming.
PAGE 12
Chapter 17: Bluetooth I/O •Hangup A2DP Sink For A2DP Sink/AVRCP, click the A “SCO” is a “Synchronous connection-oriented” link, which is the type of radio link Bluetooth uses for voice data. The SCO link is used in the APx supported protocols HFP and HSP. •AVRCP...
PAGE 13
Chapter 17: Bluetooth I/O example) support duplex audio (both directions simultaneously); some profiles (A2DP) support only simplex audio (one direction per connection). Roles Supported roles are AG “Audio Gateway” (the phone) and HS “Headset”. Typical uses are mouse, keyboard, cell phone, headphones, hands-free talk and listen. Audio Audio flows in a duplex (bi-directional) mode, connecting the Audio Gateway device to the Headset device.
PAGE 14
Chapter 17: Bluetooth I/O second. We recommend maintaining test levels above –54 dBFS for meaningful results. AVRCP AVRCP is the “Audio/Video Remote Control Profile.” This profile is used in conjunction with A2DP, and provides “transport” controls such as Play, Pause, Reverse, Forward, etc. Roles Supported profile roles are “controller” and “target.” Note: when APx is the target, AVRCP commands are ignored.
PAGE 15
Chapter 17: Bluetooth I/O vides “transport” controls such as Play, Pause, Reverse, Forward, etc. Roles are Controller and Target. Connect Paired devices can connect using compatible profiles and roles. Connection enables exchange of audio or control data. Each device can connect with only one device at a time. CVSD is Continuously Variable Slope Delta modulation, the codec used in HSP and legacy HFP profiles. With HFP 1.6, higher data rates enable the use of a higher quality codec called mSBC.
PAGE 16
Chapter 17: Bluetooth I/O sink is the term used for the device that receives audio in a uni-directional system. source is the term used for the device that transmits audio in a uni-directional system. SSP is Secure Simple Pairing, the pairing methods required in Bluetooth v2.1. Audio Precision supports the SSP Just Works, Numeric Comparison and Passkey Entry methods. Per FCC 15.19(a)(3) and (a)(4) This device complies with part 15 of the FCC Rules.
PAGE 17
NCC 警語低功率電波輻射性電機管理辦法第十二條經型式認證合格之低功率射頻電機，非經許可，公司、商號或使用者均不得擅自變更頻率、加大功率或變更原設計之特性及功能。第十四條低功率射頻電機之使用不得影響飛航安全及干擾合法通信；經發現有干擾現象時，應立即停用，並改善至無干擾時方得繼續使用。前項合法通信，指依電信規定作業之無線電信。低功率射頻電機須忍受合法通信或工業、科學及醫療用電波輻射性電機設備之干擾在5.25-5.35 秭赫頻帶內操作之無線資訊傳輸設備，限於室內使用。 Additional Antenna Information 1. the antennas on the Blue tooth Module are glued to the SMA connectors to prevent the use of alternate antennas – this equipment should be used only with the Antenna supplied from the factory - See Item 2 below Per RSS-GEN section 6.