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Users demand high voice-quality in all situations, so the acoustic perception of a device is critical. Acoustic performance is particularly significant for mobile phones, where conversations can take place almost anywhere, from a quiet office to a noisy street or a busy call centre.

Both corded and cell phones alike need advanced acoustic and electronic signal processing combined with superior design and compact size. The strict testing regimes go right through the development and production processes of telephones. With every design change in a phone, R&D needs to assess the impact on the acoustic performance. Finished designs must go through voice testing to ensure quality and intelligibility and live up to national and international standards, including 3GPP TS.26.132, 3GPP2 C.S0056, YD/T 1538, CES-Q003-2, CMCC, ITU-T P.862 (PESQ) and ITU-T P.863 (POLQA). Once in production, quality assurance, sample testing and validation are conducted on an ongoing basis and all components go through rigorous incoming inspection.

System Suggestion

Telephone headset testing system overview
Telephone handset testing system overview

Using a Brüel & Kjær Head and Torso Simulator (HATS) with ear and mouth simulators connected to our telephone testing software, it is possible to evaluate headsets and handsets in situ on a range of acoustic performance parameters. Parameters include signal reception and transmission, acoustic side tones and background noise characteristics, giving you realistic measurements of the telephone 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.

TYPE 4128-D

Head and Torso Simulator (HATS) with Handset Positioner

Designed to be used in-situ electroacoustics tests on, for example, telephone handsets, headsets, audio conference devices, microphones, headphones, hearing aids, hearing protectors and smart speakers. Includes Handset Positioner Type 4606 for accurate positioning of telephone handsets.

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.

TYPE 5128

High-frequency Head and Torso Simulator

High-frequency Head and Torso Simulator (HF HATS) provides unprecedented realism, for electroacoustic testing of smart devices and speakers, audio conferencing devices, microphones, headphones, and hearing aids.

TYPE 4987

Wideband Ear Simulator family

A range of ear simulators designed for realistic and comparable quality control testing of earphones, ear buds, smartphones and headsets on high-volume production lines.

TYPE 4988-A

1/4" Pressure-field Microphone With CCLD Preamplifier, Prepolarized

Pressure-field microphone for measurements in small, closed couplers, close to hard reflective surfaces, or flush-mounted, with a frequency response of 20 Hz to 20 kHz.