des the whole range of nature sounds, including components of speech such as vowels and consonants, and natural environment sounds like footsteps in a forest or a flowing stream," said Michael Lewicki, associate professor of computer science at Carnegie Mellon and a member of the Center for the Neural Basis of Cognition (CNBC). "We found that the optimal code for natural sounds is the same as that for speech. Oddly enough, cats share our own optimal auditory code for the English language."
"Our work is the only research to date that efficiently processes auditory code as kernalized spikes," said Evan Smith, a graduate student in psychology at the CNBC.
Until now, scientists and engineers have relied on Fourier transformations--initially discovered 200 years ago--to separate and re-constitute parameters like frequency and intensity as part of traditional sound signal processing.
"Our new signal processing framework appears far more efficient, effective and concise in conveying a rich variety of natural sounds than anything else," Lewicki said.
The approach by Smith and Lewicki dissects sound based only on the timing of compressed "spikes" associated with vowels (like cat vocalizations), consonants (like rocks hitting one another) and sibilants (ambient noise).
To gather sounds for their research, the scientists traipsed through the woods and recorded cracking branches, crunching leaves and wind rustling through leaves before returning to the laboratory to de-code the information contained in this rich set of sounds. They also discovered what they consider the most "natural" sound: if they play back a random set of spikes, it sounds like running water.
"We're very excited about this work because we can give a simple theoretical account of the auditory code which predicts how we could optimize signal processing to one day allow for much more efficient data storage on everything from DVDs to iPods," Lewicki said.
Source:Carnegie Mellon University
Page: 1 2 3 Related biology news :1
. Carnegie Mellon scientists develop tool that uses MRI to visualize gene expression in living animals2
. Robot-based system developed at Carnegie Mellon detects life in Chiles Atacama desert3
. Green catalyst destroys pesticides and munitions toxins, finds Carnegie Mellon University4
. Carnegie Mellon University research reveals how cells process large genes5
. Carnegie Mellon cyLab researchers work to develop new red tide monitoring6
. Team led by Carnegie Mellon University scientist finds first evidence of a living memory trace7
. Carnegie Mellon scientists create PNA molecule with potential to build nanodevices8
. Carnegie Mellon U. transforms DNA microarrays with standard Internet communications tool9
. Carnegie Mellon develops non-invasive technique to detect transplant rejection at cellular level10
. DNA conclusive yet still controversial, Carnegie Mellon professor says11
. Teens unaware of sexually transmitted diseases until they catch one, Carnegie Mellon study finds