Helicopter noise complaint web site opens in LA

helicopter

The Federal Aviation Authority has started a helicopter noise complaint system in the Los Angeles county area called the Automated Complaint System (this sounds like a spambot!). The monitoring system uses the  WebTrak site that Bruel and Kjaer bought a few years ago.

The WebTrak system combines GPS data from aircraft movements with noise levels from monitoring stations. Historical data of flight paths and noise levels can be inspected using a web browser.

Distortion important for determining distance of noise source

human-subject-in-anechoic-chamber-AL

Researchers at University of Connecticut Health Center, the University of Rochester, and University of Louisville have published a paper in the Journal of Neuroscience, investigating the ability of a rabbits to determine the distance of a noise source depends on the modulation of the sound.  The researchers inserted tiny microphones inside rabbits’ ears to record the sounds played at several locations. They used these recordings to simulate modulated or unmodulated noise coming from different distances away from the rabbit. Then they played the simulated sounds back to the rabbit, and measured the responses of neurons in the rabbit’s inferior colliculus (IC), a region of the midbrain known to be important for sound perception. When the rabbit heard the simulated sounds, certain types of IC neurons fired more when the sound was closer and the depth of modulation was higher – that is, when there was a bigger difference between the sound’s maximum and minimum amplitude. The neurons fired less when the sound source was further away.

Read the full article on the UConn Today web site.

 

Virtual noise simulation of Heathrow’s third runway

heathrow-airport-

An acoustic consulting company ARUP has created a 3D virtual sound simulation of the proposed Heathrow’s third runway in their facility called SoundLab. The room is lined with acoustic material to reduce reflections and 12 loudspeakers are positioned on the surface of an imaginary virtual sphere, which are used to generate sound from any direction.

 

Read the full article on wired.co.uk.

Siemen’s easyTek hearing aids

Siemen’s showed off their easyTek hearing aid system at the CES 2015 show this month, where one can change the directivity of the hearing aid microphones using the easyTek smartphone app for Apple iphones or Android devices. The plastic disk shown in the image connects the hearing aid to a bluetooth device such as a phone, MP3 player, TV etc, and permits the audio from the media player to be fed directly to the hearing aid.

New Loudspeakers

The CES 2015 show starts this week and there is sure to be a bevy of new audio gadgets.

Samsung will be showing off their new WAM 6500 and WAM 7500 loudspeakers.

Samsung WAM 6500

Samsung WAM 6500

 

Samsung WAM 7500

Samsung WAM 7500

Some other new freaky-shaped loudspeakers that are on the market include the Om One and the Mars.

The Om One from Om Audio is a levitating loudspeaker is available for pre-order for $US 199. Apart from playing music from a bluetooth device, it can also be used as a speakerphone.

 

Om One from Om Audio

Om One from Om Audio

You can watch a promo video on the development of the Om One on youtube.

Another similar levitating speaker product is from Crazybaby in Hong Kong that has developed the Mars loudspeaker. The base station houses a sub-woofer, the floating disc that radiates sound is water-proof. The device has some nifty features that can be used for conference calls, and will automatically adjust the volume depending on the proximity of your bluetooth source from the base station. The loudspeaker is available for pre-order at $US 189 from the Crazybaby web site.

Mars levitating loudspeaker

Mars levitating loudspeaker