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Limited By:	Author = Meehan, David;

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A code excited linear predictive coder: using a moments algorithm (1993)

Meehan, David

A code excited linear predictive coder: using a moments algorithm (1993)

Meehan, David

Abstract:

A speech coding algorithm was developed which was based on a new method of selecting the excitation signal from a codebook of residual error sequences. The residual error sequences in the codebook were generated from 512 frames of real speech signals. L.P.C. inverse filtering was used to obtain the residual signal. Each residual error signal was assigned an index. The index was generated using a moments algorithm. These indices were stored on a Graded Binary Tree. A Binary Search was then used to select the correct index. The use of a Graded Binary Tree in the coding algorithm reduced the search time. The algorithm faithfully reproduced the original speech when the test residual error signal was chosen from the training data. When the test residual error signal was outside the training data, synthetic speech of a recognisable quality was produced. Finally, the fundamentals of speech coders are discussed in detail and various developments are suggested.

http://doras.dcu.ie/19070/

Marked Mark

Optimising information literacy delivery to large classes: the contact or the online approach? (2009)

Meehan, David

Optimising information literacy delivery to large classes: the contact or the online approach? (2009)

Meehan, David

Abstract:

DCU Business School runs undergraduate programmes of varying sizes, from 40 to 200 students. Some modules cross disciplines and attract even higher numbers. One such module is HR118: Skills for success which in the last year has exceeded 200. Even this number is restrained by the optional nature of the module. Were it to be an obligatory module, the total would exceed 300. The Library has been providing embedded information literacy sessions to HR118 since its inception, providing face-to-face training on essential resources and research techniques, together with assessment. Generally the experience has been successful. There have been some problems, mainly organisational and logistical, but the Library and module co-ordinator have resolved these as they arise. However, the recent class size increase, and the possibility that the module may sometime become obligatory, forced the Library to devise an alternative strategy for 2008-09 – a hybrid approach which has enabled the Library...

http://doras.dcu.ie/15048/

Marked Mark

Site-Specific Evolution of Surface Stress during the Room-Temperature Oxidation of the Si(111)-(7x7) Surface. (2010)

BOLAND, JOHN; KINAHAN, NIALL; MEEHAN, DAVID

Site-Specific Evolution of Surface Stress during the Room-Temperature Oxidation of the Si(111)-(7x7) Surface. (2010)

BOLAND, JOHN; KINAHAN, NIALL; MEEHAN, DAVID

Abstract:

The reaction of molecular oxygen with the Si(111)-7?7 surface is investigated at room temperature using in situ scanning tunneling microscopy and surface stress measurements to reveal the quantitative relationship between site-specific oxygen coverage and a decrease in tensile surface stress. This relationship is described using a modified form of the reaction model originally proposed by Dujardin et al. We show that the decrease in tensile surface stress is greatest for the faulted subunits of the 7?7 cell and determine the stress signatures of different reaction products, including the absence of long-lived metastable species with a unique stress signature.

http://hdl.handle.net/2262/39651

Marked Mark

Strictly online? E-books in the academic world (2010)

Meehan, David

Strictly online? E-books in the academic world (2010)

Meehan, David

http://doras.dcu.ie/15738/

Marked Mark

Video killed the 'PDF' star: taking information resource guides online (2009)

Meehan, David; Hyland, Jack

Video killed the 'PDF' star: taking information resource guides online (2009)

Meehan, David; Hyland, Jack

Abstract:

Easy-to-use technologies now allow librarians to create their own customised digital and video tutorials. This article takes a look at publisher-created video tutorials. It considers the pros and cons of libraries creating their own video-format guides, and elaborates on DCU Library's own experience in producing video-based tutorials on databases customised to local needs using Camtasia and Screentoaster.

http://doras.dcu.ie/15072/

Displaying Results 1 - 5 of 5 on page 1 of 1