Please wait, while we are loading the content...
| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Turner, J. |
| Copyright Year | 1982 |
| Description | Author affiliation: Stanford University, Stanford, CA (Turner, J.) |
| Abstract | The process of whitening or decorrelating is used extensively in detection and estimation problems. Far situations where the signal characteristics are time varying, adaptive processing that will track are necessary. The standard block data autoregressive model are computationally inefficient when applied to sliding data frames with high percentage overlaps. Recursive techniques, either of the gradient or exact solution type using exponential weighting of post data, have been shown to track time varying spectral characteristics quite accurately. However when the data sampling rate is very high, the computational complexity is too much for real time implementation or requires several expensive multiplier chips. When the model coefficients are required to have only limited accuracy to meet transmission bandwidth or storage memory requirements, the technique presented here can be used to reduce the hardware implementation requirements. The fast approximate whitening ladder filter uses the ladder structure and reflection coefficients of the fast tracking recursive algorithms above. As in the recursive ladder algorithms, it performs an approximate stage by stage orthogonalization of the input signal, in a computationally and implementationally simple fashion. The accuracy of the reflection coefficient has been compromised for this simplicity. but similar accuracy as that used in speech model can be obtained. At each stage in the ladder, to estimate the reflection coefficient polarity coincidence counting and a table lookup is all that is required. Using a sliding memory where only the sign of the data is stored, this estimation technique can used to adapt to changing signal characteristics. The virtue of the fast approximate whitening ladder filter is its ability to adaptively decorrelate (whiten) a process sampled at rates faster than that possible using computations requiring multiplier chips. |
| Starting Page | 655 |
| Ending Page | 658 |
| File Size | 128018 |
| Page Count | 4 |
| File Format | |
| DOI | 10.1109/ICASSP.1982.1171782 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 1982-05-03 |
| Publisher Place | France |
| Access Restriction | Subscribed |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Filters Reflection Decorrelation Signal processing Computational modeling Sampling methods Computational complexity Bandwidth Hardware Speech |
| Content Type | Text |
| Resource Type | Article |
National Digital Library of India (NDLI) is a virtual repository of learning resources which is not just a repository with search/browse facilities but provides a host of services for the learner community. It is sponsored and mentored by Ministry of Education, Government of India, through its National Mission on Education through Information and Communication Technology (NMEICT). Filtered and federated searching is employed to facilitate focused searching so that learners can find the right resource with least effort and in minimum time. NDLI provides user group-specific services such as Examination Preparatory for School and College students and job aspirants. Services for Researchers and general learners are also provided. NDLI is designed to hold content of any language and provides interface support for 10 most widely used Indian languages. It is built to provide support for all academic levels including researchers and life-long learners, all disciplines, all popular forms of access devices and differently-abled learners. It is designed to enable people to learn and prepare from best practices from all over the world and to facilitate researchers to perform inter-linked exploration from multiple sources. It is developed, operated and maintained from Indian Institute of Technology Kharagpur.
Learn more about this project from here.
NDLI is a conglomeration of freely available or institutionally contributed or donated or publisher managed contents. Almost all these contents are hosted and accessed from respective sources. The responsibility for authenticity, relevance, completeness, accuracy, reliability and suitability of these contents rests with the respective organization and NDLI has no responsibility or liability for these. Every effort is made to keep the NDLI portal up and running smoothly unless there are some unavoidable technical issues.
Ministry of Education, through its National Mission on Education through Information and Communication Technology (NMEICT), has sponsored and funded the National Digital Library of India (NDLI) project.
| Sl. | Authority | Responsibilities | Communication Details |
|---|---|---|---|
| 1 | Ministry of Education (GoI), Department of Higher Education |
Sanctioning Authority | https://www.education.gov.in/ict-initiatives |
| 2 | Indian Institute of Technology Kharagpur | Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project | https://www.iitkgp.ac.in |
| 3 | National Digital Library of India Office, Indian Institute of Technology Kharagpur | The administrative and infrastructural headquarters of the project | Dr. B. Sutradhar bsutra@ndl.gov.in |
| 4 | Project PI / Joint PI | Principal Investigator and Joint Principal Investigators of the project |
Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon |
| 5 | Website/Portal (Helpdesk) | Queries regarding NDLI and its services | support@ndl.gov.in |
| 6 | Contents and Copyright Issues | Queries related to content curation and copyright issues | content@ndl.gov.in |
| 7 | National Digital Library of India Club (NDLI Club) | Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach | clubsupport@ndl.gov.in |
| 8 | Digital Preservation Centre (DPC) | Assistance with digitizing and archiving copyright-free printed books | dpc@ndl.gov.in |
| 9 | IDR Setup or Support | Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops | idr@ndl.gov.in |
|
Loading...
|