Main Menu

See All Software See All Instruments See All Transducers See All Vibration Testing Equipment See All Electroacoustics See All Acoustic End-of-Line Test Systems See All Academy See All Resource Center See All Applications See All Industries See All Services See All Support See All Our Business See All Our History See All Global Presence

Main Menu

See All Analysis & Simulation Software See All DAQ Software See All Drivers & API See All Utility See All Vibration Control See All High Precision and Calibration Systems See All DAQ Systems See All S&V Hand-held Devices See All Industrial Electronics See All Power Analyzer See All S&V Signal Conditioner See All Acoustic Transducers See All Current and Voltage Sensors See All Displacement Sensors See All Force Sensors See All Load Cells See All Multi Component Sensors See All Pressure Sensors See All Strain Sensors See All Strain Gauges See All Temperature Sensors See All Tilt Sensors See All Torque Sensors See All Vibration See All Accessories for Vibration Testing Equipment See All Vibration Controllers See All Measurement Exciters See All Modal Exciters See All Power Amplifiers See All LDS Shaker Systems See All Test Solutions See All Actuators See All Combustion Engines See All Durability See All eDrive See All Production Testing Sensors See All Transmission & Gearboxes See All Turbo Charger See All Training Courses See All Acoustics See All Asset & Process Monitoring See All Custom Sensors See All Durability & Fatigue See All Electric Power Testing See All NVH See All Reliability See All Vibration See All Weighing See All Automotive & Ground Transportation See All Calibration See All Installation, Maintenance & Repair See All Support Brüel & Kjær See All Release Notes See All Compliance

Main Menu

See All nCode - Durability and Fatigue Analysis See All ReliaSoft - Reliability Analysis and Management See All API See All Experimental Testing See All Electroacoustics See All Noise Source Identification See All Environmental Noise See All Sound Power and Sound Pressure See All Noise Certification See All Industrial Process Control See All Structural Health Monitoring See All Electrical Devices Testing See All Electrical Systems Testing See All Grid Testing See All High-Voltage Testing See All Vibration Testing with Electrodynamic Shakers See All Structural Dynamics See All Machine Analysis and Diagnostics See All Dynamic Weighing See All Vehicle Electrification See All Calibration Services for Transducers See All Calibration Services for Handheld Instruments See All Calibration Services for Instruments & DAQ See All On-Site Calibration See All Resources See All Software License Management

Beamforming is the ideal technique for sound-source location from medium to long measurement distances. Basically, the source location is performed by estimating the amplitudes of plane (or spherical) waves incident towards the array from a chosen set of directions.

The angular resolution is inversely proportional to the array diameter measured in units of wavelength, so the array should be much larger than wavelength to get a fine angular resolution. At low frequencies, this requirement usually cannot be met, so here the resolution will be poor.

Beamforming is often used to improve the spatial resolution, and it is well-suited for large objects such as vehicles in wind tunnels, where the array is placed relatively far from the source, outside the turbulent airflow.


System Suggestion

Beamforming with Microphone Array

Beamforming is valid for medium to high frequencies (500 Hz to 20 kHz), and can be expanded with holography when used close to sources such as engines in a test cell.

Unlike what the above image indicates, beamforming does not require the array to be larger than the sound source. For typical, irregular array designs, the beamforming method does not allow the measurement distance to be much smaller than the array diameter. On the other hand, the measurement distance should be kept as small as possible to achieve the finest possible resolution on the source surface.

Beamforming provides an acoustical map of noise sources by using an array of microphones to detect the direction of arrival of sound from the sources. The number of microphones in the microphone array system can vary from 18 to 144, and with an integrated camera you are able to see simple and intuitive measurement information in real-time.

Brüel & Kjær beamforming system is setup with measurement and post-processing software, a planar sliced wheel array of 18 microphones and our LAN-XI Data Acquisition System. This system setup is ideal for noise-source identification, troubleshooting investigations, Squeak and Rattle testing and industrial plant noise measurements.

The patented wideband holography in the Brüel & Kjær beamforming system can be used to measure over a very wide frequency range. And with the addition of a transient option enables averaging in the domains of time, RPM and angle, making it ideal for powertrain analysis.

Beamforming system

Learn More: 

Beamforming measurements on a superkart (Video)

Related Products


Flyover moving source beamforming

Software for noise source location on flying aircraft, in combination with a microphone array.


Wind turbine moving source beamforming

Software for noise source location on operational wind turbines, in combination with a microphone array.

TYPE 7788

Outdoor vehicle pass-by noise software

For making field pass-by noise tests to ISO standards, and correlating exterior noise with sound sources measured on the vehicle.


Road vehicle moving source beamforming

Software for noise source location on moving road vehicles in combination with a portable microphone array.


Rail vehicle moving source beamforming

Software for noise source location on moving rail vehicles in combination with a portable microphone array.

TYPE 8606

Spherical beamforming software

Fast, one-shot noise source location of complete rooms or cabins in a 360-degree sound map overlaid on a photograph, using a spherical microphone array containing cameras.