www.davidson.com.au - Head Acoustics Aurally-Accurate Signal Analysis

BHM IV is a binaural measurement system including equalization for obtaining aurally-accurate recordings where an Artificial Head cannot be used, for example, from the driver’s seat when a vehicle is being driven. It comprises the microphone unit BHM III.2 and the supply unit BEQ I.

As with the Artificial Head measurement systems by HEAD acoustics, BHM IV enables aurally-accurate binaural recording of sound events. These recordings support all characteristics of human aural perception, especially spatial hearing. This is the condition for a correct auditory impression during playback. Measurements are compatible with conventional measuring technology and allow objective analysis. Areas of application include investigation into the sound quality of a wide range of products where an Artificial Head isn’t practical, and also special measurement tasks for head-related acoustic recordings.

BHM IV operates with audio data in 24 bit format, thus achieving the high dynamic range found in human hearing.

Operation
The Binaural HEAD Microphone BHM IV fits on the head like standard headphones, and the wearer takes on the acoustic function of the Artificial Head. The ear canal entrance is terminated with a defined acoustic impedance. Sounds are conducted via small probes to the two highly-sensitive electrostatic measurement microphones located in capsules exterior to the ears. An adjustable headband ensures that the device fits correctly, thus allowing optimum comfort for the wearer.

Power supply unit BEQ I
All electronics for sound measurement, signal processing and power supply are built into the Binaural Equalizer BEQ I, which has an independent interruption-free power supply including "smart charge" electronics for the built-in rechargeable battery.

Mobility
Independent-of-mains power supply and the compact design of the equalizer make BHM IV a flexible and mobile system adapted to a wide range of applications.