TIA-920-B: Measurement of Narrowband and Wideband Digital Phones
Complete sequence for testing digital communications devices with handset features, according to TIA-920.110-B and speakerphones, according to TIA-920.120-B
About
TIA 920-B is a comprehensive US dual-bandwidth standard that applies to both narrowband (NB) and wideband (WB) devices. It also allows a choice between Free Field (FF) and Diffuse Field (DF) as the Listener Reference Point (LRP). These sequences measure digital communications devices with handset features according to TIA-920.110-B, speakerphones according to TIA-920.120-B, and headsets according to TIA-920.130-B.
This module is a large, structured set of sequences and subsequences which perform all the measurements. Curves and values are shown on the screen, and tolerance checks are performed. Data is saved to a pre-formatted Excel test report that includes all measurements on any one device. Completely prompted sequences for calibration of all the transducers are included. After a one-time setup with a sound card and other user-specific interfaces, the sequences are automatic. They run by simply selecting, pressing start, and following prompts where user interaction with the device under test is required. The sequence works with approved sound cards for connection to the transducers. Windows audio devices such as USB headsets work directly with SoundCheck®. VoIP softphones also work with SoundCheck, by means of a recommended third-party Windows audio application.
The current release of these sequences is compatible with SoundCheck version 20. It includes new sequences to test speakerphone or headset devices that connect to a server, using the “open loop” method.
Required Hardware
- Head and Torso Simulator with handset positioner
- Mouth Simulator
- Power amplifier (if needed to power artificial mouth in Head and Torso Simulator), e.g. Listen SC Amp Part #4060
- SoundConnect (Part #4020 ) or SoundConnect 2 (Part # 4026 / 4026) Microphone Power Supply
- SCM microphone or equivalent (Part # 4002)
- Acoustic calibrator
- Sound card supporting 44.1kHz sampling rate
Required Software
- SoundCheck 20 Plus (part #1102) or later (see note)
- Loudness rating module (part #2007)
- Wave file equalization module (part #2013)
- Realtime Analyzer (part #2005)
Note: A 4-channel license may be required for the headset sequences that connect to a sound card. Otherwise, a 2-channel physical sound card is sufficient for testing USB and other devices which connect as “virtual” Windows audio devices, such as a softphone on the test pc.
Setup Diagrams
Test setup for handset measurement
Test setup for headset measurement
Test setup for smart speaker speakerphone functionality
Setup and calibration
Due to the complex nature of this sequence, please refer to the detailed instructions that are provided as part of the package.
Get Sequence
Please contact your Listen sales engineer or representative to learn more about, or purchase this sequence.
