用途
- Binaural sound recording at the entrance to the human ear canal
- Sound recording where a vehicle’s driver wears the Binaural Microphone
- Binaural recordings where the individual test person’s head and torso influence is important
- Sound recording of a helmeted person, for example, a motorcycle driver
- Psychoacoustic experiments requiring binaural sound recordings on human subjects
- Binaural recordings where the use of a traditional Head and Torso Simulator (HATS), for example, Sound Quality Head and Torso Simulator Type 4100, is impossible
- Evaluation of headphones and ear muffs on a human subject’s head/ears
| 特徴
- Uses miniature, prepolarized condenser microphones that are positioned at the entrance to the ear canal and that don’t affect normal hearing capabilities
- Very lightweight: < 10="" g="" down="" to="" the="" cable="" clip="" carrying="" the="" remaining="">
- Connects to and powered from DeltaTron® input (3 to 10 mA) via a BNC plug or 7 – 9 VDC supplied via 15 kW
- Can be used with an extension cable of up to 100 m in length
- Free-field and diffuse-field corrections available as an ASCII table and built into the PULSE™ Sound Quality Software Type 7698
- Low Equivalent Noise Level of 23 dB(A)
- Calibration adaptor for Sound Level Calibrator Type 4231 included
- TEDS (Transducer Electronic Data Sheet) available in Type 4101 A
|
General
The Binaural Microphone’s upper section comprises two 2 mm stainless-steel tubes. Because the microphone cables run through the inside of the tubes, either tube can be continuously bent without collapsing and reshaped to suit test personnel. A miniature coaxial cable in one braid connects Microdot to BNC connectors. Additionally, a cable clip that can be attached to the test subject’s clothing is supplied to relieve pressure on both the microphone’s upper section and the test subject’s ear canal, freeing them from supporting any unnecessary weight or stress exerted by the remaining cable.
The microphone capsules are specially selected versions of the well-proven miniature condenser microphones from DPA Microphones. They are mounted in a gold-plated capsule that is resistant to moisture.
Calibration
The microphones are selected based on matching frequency responses. Operating in the open ear canal of the test person, the Binaural Microphone is calibrated with Head and Torso Simulator Type 4128, which also has an open ear canal.
In a diffuse sound field, the Binaural Microphone is measured for its diffuse-field response mounted on HATS Type 4128. The free-field response at 0 degrees frontal incidence is measured in the same way but in an anechoic room. In both cases, the results are averaged over several different mountings of the Binaural Microphone on HATS Type 4128.
The resulting data is printed in the table below and is also included in PULSE Sound Quality Software Type 7698.
Level calibration of the Binaural Microphone when in use is performed using the special calibration adaptor together with Sound Level Calibrator Type 4231. Using the adaptor, the output level from the calibrator will be increased by 0.35 dB ± 0.2 dB.
For a full Description and Specifications, see
Product Data
