Featured Research

from universities, journals, and other organizations

Dolphin speaker to enhance study of dolphin vocalizations and acoustics

Date:
May 8, 2012
Source:
Acoustical Society of America (ASA)
Summary:
To gain new insights into how dolphins communicate, researchers in Japan created a prototype of an extremely broadband “dolphin speaker” capable of projecting dolphins’ communication sounds, whistles, burst-pulse sounds, as well as detection sounds such as echolocation clicks.

To gain new insights into how dolphins communicate, researchers in Japan created a prototype of an extremely broadband “dolphin speaker” capable of projecting dolphins’ communication sounds, whistles, burst-pulse sounds, as well as detection sounds such as echolocation clicks.
Credit: Image courtesy of Acoustical Society of America (ASA)

Dolphins rely on the combination of a variety of vocalizations and vastly better acoustic abilities than humans to communicate with each other or to detect their surroundings and prey in the dark sea. To gain new insights into how dolphins communicate, researchers in Japan created a prototype of an extremely broadband "dolphin speaker" capable of projecting dolphins' communication sounds, whistles, burst-pulse sounds, as well as detection sounds such as echolocation clicks.

Related Articles


Yuka Mishima, a graduate student at Tokyo University of Marine Science and Technology, along with university colleagues and collaborators at Fusion Inc., will present their research at the Acoustics 2012 meeting in Hong Kong, May 13-18, a joint meeting of the Acoustical Society of America (ASA), Acoustical Society of China, Western Pacific Acoustics Conference, and the Hong Kong Institute of Acoustics.

Dolphins can hear and produce not only low-frequency sounds below 20 kHz, which humans can also hear and produce, but go a step further to high-frequency sounds of up to 150 kHz, which are too high for humans to hear. Not only can dolphins produce tonal sounds like humans, they're capable of vocalizing at a variety of frequencies simultaneously.

"Acoustic studies of dolphins that have been done so far focus mainly on recordings of vocalizations and hearing abilities, but relatively few playback experiments have been conducted," explains Mishima. "There were no speakers that could project from low to high frequencies like dolphins, although some could project the low-frequency sounds or parts of dolphin sounds."

Since playback experiments are a very important part of gaining a better understanding of dolphins' communication and detection abilities, the researchers decided to create their own "dolphin speaker."

"Our goal was to develop a dolphin speaker that could project the full range of all of the sounds dolphins make," Mishima says. "We succeeded in developing a prototype broadband transducer for an echosounder last year by using new types of piezoelectric elements that had never been used for underwater acoustic transducers."

They applied this technique to their dolphin speaker prototype, and it can now project sounds in the 7 to 170 kHz range.

"The next step is to faithfully playback the original sounds of the dolphins by using the dolphin speaker. Once the dolphin speaker is completed it will enable us to playback a variety of dolphin sounds to dolphins, which will help to broaden the research of their acoustic abilities," notes Mishima.


Story Source:

The above story is based on materials provided by Acoustical Society of America (ASA). Note: Materials may be edited for content and length.


Cite This Page:

Acoustical Society of America (ASA). "Dolphin speaker to enhance study of dolphin vocalizations and acoustics." ScienceDaily. ScienceDaily, 8 May 2012. <www.sciencedaily.com/releases/2012/05/120508151956.htm>.
Acoustical Society of America (ASA). (2012, May 8). Dolphin speaker to enhance study of dolphin vocalizations and acoustics. ScienceDaily. Retrieved November 22, 2014 from www.sciencedaily.com/releases/2012/05/120508151956.htm
Acoustical Society of America (ASA). "Dolphin speaker to enhance study of dolphin vocalizations and acoustics." ScienceDaily. www.sciencedaily.com/releases/2012/05/120508151956.htm (accessed November 22, 2014).

Share This


More From ScienceDaily



More Plants & Animals News

Saturday, November 22, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Could Your Genes Be The Reason You're Single?

Could Your Genes Be The Reason You're Single?

Newsy (Nov. 21, 2014) Researchers in Beijing discovered a gene called 5-HTA1, and carriers are reportedly 20 percent more likely to be single. Video provided by Newsy
Powered by NewsLook.com
Raw: Baby Okapi Born at Houston Zoo

Raw: Baby Okapi Born at Houston Zoo

AP (Nov. 20, 2014) The Houston Zoo released video of a male baby okapi. Okapis, also known as the "forest giraffe", are native to the Democratic Republic of the Congo in Central Africa. Video is mute from source. (Nov. 20) Video provided by AP
Powered by NewsLook.com
Your Complicated Job Might Keep Your Brain Young

Your Complicated Job Might Keep Your Brain Young

Newsy (Nov. 20, 2014) Researchers at the University of Edinburgh found the more complex your job is, the sharper your cognitive skills will likely be as you age. Video provided by Newsy
Powered by NewsLook.com
Mysterious Glow Worms Found in the Amazon

Mysterious Glow Worms Found in the Amazon

Buzz60 (Nov. 20, 2014) Wildlife photographer Jeff Cremer teamed up with entomologist Aaron Pomerantz and others to investigate a predatory glow worm found in the Amazon. Patrick Jones (@Patrick_E_Jones) explains. Video provided by Buzz60
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:

Strange & Offbeat Stories


Plants & Animals

Earth & Climate

Fossils & Ruins

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins