Featured Research

from universities, journals, and other organizations

Signal processing: Look-up tables to shoulder the processing load

Date:
March 13, 2013
Source:
The Agency for Science, Technology and Research (A*STAR)
Summary:
Computing tasks for signal processing could be performed more quickly with less power by using look-up tables.

Advanced mathematical algorithms are essential for processing electronic signals within computers and embedded processors. Scientists and engineers are constantly refining and redesigning their algorithms to obtain higher throughput of information on ever smaller devices that consume less power.

Related Articles


Now, Pramod Kumar Meher of the A*STAR Institute for Infocomm Research in Singapore and co-workers at Central South University in Changsha, China, have developed an efficient new method to implement an important step in signal processing, called the discrete cosine transform (DCT). Their method could lead to devices that occupy smaller areas, provide higher throughput of information, and consume less power than existing devices.

The DCT is commonly used for the compression of digital video and audio such as MPEG files. Similar to the better-known Fourier transform, the DCT involves expressing a series of data points as a sum of their product with cosine functions.

Several algorithms and software architectures already exist for computing so-called 'power-of-two-length DCTs'. But, those DCTs are not suitable for all applications. The prime-length DCT is an alternative to the power-of-two-length DCT that has the potential to be more efficient for implementation in hardware, Meher notes.

Meher and his co-workers have focused on computing the DCT of different lengths of practical interest using specialized digital circuits that occupy less area on a silicon chip and use less power, but run at adequate speed. They not only derived a more efficient algorithm for DCT, but also derived new architecture -- based on the 'distributed arithmetic' approach -- for implementing the algorithm in integrated circuit chips.

Meher and co-workers made use of a theorem that inter-relates the transforms with cyclic convolution of two finite duration sequences. By using look-up tables, this convolution, and thereafter the prime-length DCT, could be performed quickly and accurately.

The team also described a new, efficient algorithm for decomposing the DCT -- in mathematics, this means rewriting the problem in terms of a combination of simpler quantities. In addition to reducing the required size of read-only memory (ROM), the researchers found that overall their algorithm significantly reduced the computation time.

"We found that the proposed design involves significantly less area and it yields higher throughput with less power consumption than the corresponding existing designs," says Meher. "The structure we propose is highly regular, modular and therefore suitable for Very Large Scale Integration realization."


Story Source:

The above story is based on materials provided by The Agency for Science, Technology and Research (A*STAR). Note: Materials may be edited for content and length.


Journal Reference:

  1. Jiafeng Xie, Pramod Kumar Meher, Jianjun He. Hardware-Efficient Realization of Prime-Length DCT Based on Distributed Arithmetic. IEEE Transactions on Computers, 2012; DOI: 10.1109/TC.2012.64

Cite This Page:

The Agency for Science, Technology and Research (A*STAR). "Signal processing: Look-up tables to shoulder the processing load." ScienceDaily. ScienceDaily, 13 March 2013. <www.sciencedaily.com/releases/2013/03/130313111658.htm>.
The Agency for Science, Technology and Research (A*STAR). (2013, March 13). Signal processing: Look-up tables to shoulder the processing load. ScienceDaily. Retrieved January 28, 2015 from www.sciencedaily.com/releases/2013/03/130313111658.htm
The Agency for Science, Technology and Research (A*STAR). "Signal processing: Look-up tables to shoulder the processing load." ScienceDaily. www.sciencedaily.com/releases/2013/03/130313111658.htm (accessed January 28, 2015).

Share This


More From ScienceDaily



More Computers & Math News

Wednesday, January 28, 2015

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

PlayStation Now Smart TV App

PlayStation Now Smart TV App

Rumble (Jan. 27, 2015) PlayStation Now Smart TV app is coming soon and will be available on both Sony and Samsung HDTV, allowing you to play games without even a counsel! Check out the video for more info. Credit to &apos;booredatwork&apos;. Video provided by Rumble
Powered by NewsLook.com
WikiLeaks Accuses Google of Handing Over Emails to US

WikiLeaks Accuses Google of Handing Over Emails to US

AFP (Jan. 27, 2015) Whistleblowing site WikiLeaks accused Google of handing over the emails and electronic data of its senior staff to the US authorities without providing notification until almost three years later. Duration: 01:09 Video provided by AFP
Powered by NewsLook.com
Shark Bite Victim Making Amazing Recovery

Shark Bite Victim Making Amazing Recovery

AP (Jan. 27, 2015) A Texas woman who lost more than five pounds of flesh to a shark in the Bahamas earlier this month could be released from a Florida hospital soon. Experts believe she was bitten by a bull shark while snorkeling. (Jan. 27) Video provided by AP
Powered by NewsLook.com
Cablevision Enters Wi-Fi Phone Fray

Cablevision Enters Wi-Fi Phone Fray

Reuters - Business Video Online (Jan. 26, 2015) The entry by Cablevision and Google could intensify the already heated price wars for mobile phone service. Fred Katayama reports. Video provided by Reuters
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


Space & Time

Matter & Energy

Computers & Math

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