Smart Speaker Testing - Speech and Audio

Smart speakers have taken households by storm. With consumer satisfaction closely linked to how well smart speakers understand voice commands; speech intelligibility and overall sound quality are crucial factors in meeting today's market demands.

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HATS Type 4988

Realistic Smart Speaker Testing

An often-used method to measure response accuracy rate in smart speakers is called "RAR". The idea is to replaying a recorded voice from a speaker in order to evaluate if and how often a voice command is recognized. However, as the directional character and frequency range of a human voice is different, this method can produce misleading results.

New testing standards and requirements

To improve smart speaker quality, leading platform providers have set high requirements for speech recognition, using testing methods which accurately match the characteristics of a human voice to ensure product performance and customers satisfaction.

Simulation is the solution

To achieve the best best result, Brüel & Kjær offers market-leading Mouth and Ear simulators, which provide highly accurate means to secure quality in product testing.

Brüel & Kjær’s High-frequency Head and Torso Simulator complies with key features defined in the ITU-T P.58 standard for Objective Measurement Apparatus.


The High-frequency HATS Type 5218 family by Brüel & Kjær: The new standard in the field of product audio evaluation.

Capable of both issuing voice commands and measuring smart speaker response (full frequency range up to 20 kHz) makes fully automated testing of smart speakers and other voice operated devices possible.

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Mouth Simulator - Smart Speaker Testing

Mouth Simulator

Mouth Simulator Type 4227 by Brüel & Kjær, is a high-performance artificial mouth, which simulates human speech dispersion patterns.

The mouth simulator’s compact packaging and rugged construction makes it perfect for use in R&D laboratories, or production test stands. The high quality of its construction provides reliable and repeatable measurements over extended periods of time, and complies with ITU-T P.51 testing standards.

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Acoustic dispersion in speech

Acoustic dispersion in speech

To reproduce a realistic human voice setup for smart speaker testing, acoustic speech dispersion comes into effect. Dispersion and attenuation of amplitude effects speech level in various angle and distance.

Brüel & Kjær’s High-frequency Head and Torso Simulator complies with key features defined in the ITU-T P.58 standard for Objective Measurement Apparatus, which defines attenuation values in relation to the Mouth Reference Point (MRP).*

*A position 25mm in front of the Lip Reference Plane (LRP) and defined in terms of dB attenuation relative to 65.3dB SPL at a distance of 500 mm in front of the MRP or 89.3 dB SPL at the MRP. Points are located on a circle centred at MRP and distributed in the horizontal plane at 0°, ±15°, ±30° and ±90° as well as in the vertical plane at ±15° and ±30°.

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