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When evaluating the acoustic performance of hands-free communication devices, it is important to take into consideration the surroundings, as well as the acoustic influence of the head and body. In addition to traditional parameters for characterization of communication devices, such as frequency response, loudness rating and directivity response, it is necessary to determine transmission quality in the presence of background noise, switching, and echo cancelling, as these are known to have close correlation with the audio performance and perceived quality of the reproduction of the human voice of hands-free equipment.

System Suggestion

Testing of hands-free devices system overview

For testing hands-free devices, we suggest a system that simulates real life communication situations as closely as possible, without letting the physical presence of a human interfere with the measurements.

The system consists of a HATS with ear and mouth simulators, a measurement front end and the PULSE-based Voice Testing Software for Hands-free-equipment Type 7909-NS1. The software has capabilities for both data acquisition and data analysis, according to standards set by VDA (Verband der Automobilindustrie). The system can be used in a lab setting and for in-vehicle testing of audio performance.


TYPE 7907-NS1

PULSE Electroacoustics Type 7907-NS1

A versatile platform for electroacoustic transducer evaluation, PULSE Electroacoustics includes a wide range of advanced analysis capabilities required by audio engineers working in acoustical design research and development.

Electroacoustic test automation and data management

PULSE software for automating repetitive test sequences by scripting, and for archiving results for easy recall and overviewing

TYPE 4128-C

Head and Torso Simulator (HATS)

Designed to be used for in situ electroacoustics tests on, for example, telephone handsets, headsets, audio conference devices, microphones, headphones, hearing aids, hearing protectors and smart speakers.

TYPE 3160

Generator Module

Designed for applications where system excitation is required, such as audio and electro-acoustic test applications.

TYPE 2735

Measurement Power Amplifier

A compact, highperformance, 2 × 35 W power amplifier designed for electroacoustic and general-purpose applications.

TYPE 4938-A-011

1/4" Pressure-field Microphone With Preamplifier Type 2670, Ext. Polarized

Pressure-field TEDS Microphone designed for high-level and high-frequency measurements with a frequency response of 4 Hz to 70 kHz.