Our Patents, Trade Marks and Others

  Patents

Technological innovation is a key to the development of the technology-based knowledge-intensive contents of the Addestation.  Among a variety of technological innovations that we have come up with, we have filed patent applications of the two strategic ones as follows:

• “Method and device for analog/digital converting a signal including a low-frequency component”, Patent Cooperation Treaty (PCT) Patent Application No. PCT/SG00/00015 *;
• “An arrangement and a method for measuring the speed of sound”, PCT Patent Application No. PCT/SG00/00085;

  Trademarks

The product name, “Addestation^TM”, is a registered trademark in Australia, United Kingdom, Germany.  Trademark applications in Singapore, Japan, United States, Malaysia, Hong Kong and Canada have been submitted.

Other trademarks include “Addest”, “FunScope”, “aMixer” and “aMatrix”. 

  Technical Publications

Digital signal processing plays a very crucial role in achieving the Addestation’s superiority and differentiation from others.  In this connection, many of our R&D staffs are themselves experts in digital signal processing and have published numerous papers on the subject area in top international journals as follows:

[1]   Kah-Chye Tan, Sian-Sheng Neo and Benjamin Yeo,  “Ellipsoid Representation of Reference Templates for Efficient Speaker Verification,” IEEE Transactions on Speech & Audio Processing Vol. 9, No. 3, pp. 302-311, 2001;

[2]   Kezhi Mao, Kah-Chye Tan and Wee Ser, “Probabilistic Neural-Network Structure Determination for Pattern Classification,” IEEE Transactions on Neural Networks, Vol. 11, No. 4, pp. 1009-1016, 2000;

[3]   Zenton Goh, Kah-Chye Tan and B.T.G. Tan,  “Kalman-Filtering Speech Enhancement Method Based on a Voiced-Unvoiced Speech Model,” IEEE Transactions on Speech & Audio Processing, Vol. 7, No. 5, pp. 510-524, 1999;

[4]   Kwok-Chiang Ho, Kah-Chye Tan and B.T.G. Tan, “Linear Dependence of Steering Vectors Associated with Tripole Arrays,” IEEE Transactions on Antennas and Propagation, Vol. 46, No. 11, pp. 1705-1711, 1998;

[5]   Ming Zhang, Kah-Chye Tan and Meng Hwa Er, “Three Dimensional Sound Synthesis based on Head-Related Transfer Functions,” Journal of Audio Engineering Society, Vol. 46, No. 10, pp. 836-844, 1998;

[6]   Zenton Goh, Kah-Chye Tan and B.T.G. Tan, “Postprocessing Method for Suppressing Musical Noise Generated by Spectral Subtraction,” IEEE Transactionson on Speech and Audio Processing, Vol. 6, No. 3, pp. 287-292, 1998;

[7]   Zenton Goh, Kah-Chye Tan and B.T.G. Tan,  “Estimating Time-Varying Noise Introduced by CVSD for Speech Enhancement,” IEE Proceedings- Vision, Image and Signal Processing,Vol. 145, No. 1, pp. 23-29, 1998;

[8]   Wee Ser, Kah-Chye Tan and Kwok-Chiang Ho, “A New Method for Determining “Unknown” Worst-Case Channels for Maximum-Likelihood Sequence Estimation, IEEE Transactions on Communications, Vol. 46, No. 2, pp. 164-168, 1998;

[9]   Kwok-Chiang Ho, Kah-Chye Tan and B.T.G. Tan, “Efficient Method for Estimating Directions-of-Arrival of Partially Polarized Signals with Electromagnetic Vector Sensors,” IEEE Transactions on Signal Processing, Vol. 45, No. 10, pp. 2485-2498, 1997;

[10]   Kah-Chye Tan and Geok-Lian Oh, “Estimating Directions-of-Arrival of Coherent Signals in Unknown Correlated Noise via Spatial Smoothing,” IEEE Transactions on Signal Processing, Vol. 45, No. 4, pp. 1087-1091, 1997;

[11]   Kah-Chye Tan, Kwok-Chiang Ho and Arye Nehorai, “Linear Independence of Steering Vectors of An Electromagnetic Vector Sensor,” IEEE Transactions on Signal Processing, Vol. 44, No. 12, pp. 3099-3107, 1996;

[12]   Kah-Chye Tan, Kwok-Chiang Ho and Arye Nehorai, “Uniqueness Study of Measurements Obtainable with Arrays of Electromagnetic Vector Sensors,” IEEE Transactions on Signal Processing, Vol. 44, No. 4, pp. 1036-1039, 1996;

[13]   Kah-Chye Tan, Eng-Chye Tan and Say Song Goh, “Counterexamples to a Conjecture for Characterizing Higher Rank Ambiguities,” IEEE Transactions on Signal Processing, Vol. 44, No. 4, pp. 1028-1029, 1996;

[14]    Kah-Chye Tan, Say Song Goh and Eng-Chye Tan, “A Study of the Rank- Ambiguity Issues in Direction-of-Arrival Estimation,” IEEE Transactions on Signal Processing, Vol. 44, No. 4, pp. 880-887, 1996;

[15]    Kah-Chye Tan and Zenton Goh, “A Detailed Derivation of Arrays Free of Higher Rank Ambiguities,” IEEE Transactions on Signal Processing, Vol. 44, No. 2, pp. 351-359, 1996;

[16]   Kwok-Chiang Ho, Kah-Chye Tan and Wee Ser, “An Investigation on the Number of Signals whose Directions-of-Arrival are Uniquely Determinable with an Electromagnetic Vector Sensor,” Signal Processing, Vol. 47, No. 1, pp. 41-54, 1995;

[17]    Kah-Chye Tan, Meng Hwa Er and Geok-Lian Oh, “A New Measure for Assessing the Accuracy of Direction-of-Arrival Estimate,” Signal Processing, Vol. 35, No. 3, pp. 295-303, 1994;

[18]    Kah-Chye Tan, Geok-Lian Oh and Meng Hwa Er,  “A Study of the Uniqueness of Steering Vector in Array Processing,” Signal Processing, Vol 34, No. 3, pp. 245-256, 1993;

[19]    Kah-Chye Tan and Antony P.C. Ng, “A Comparison of two Approaches for Improving Direction-of-Arrival Estimates in the Presence of Non-White Noise,” Signal Processing, Vol. 31, No. 2, pp. 203-214, 1993;

[20]    Kah-Chye Tan, Hock Lim and B.T.G. Tan, “Windowing Techniques for Image Restoration,” CVGIP: Graphic Models and Image Processing, Vol. 53, No. 5, pp. 491-500, 1991;

[21]    Hock Lim, Kah-Chye Tan and B.T.G. Tan, “New Methods for Restoring Motion-Blurred Images Derived from Edge-Error Considerations,” CVGIP: Graphic Models and Image Processing, Vol. 53, No. 5, pp. 479-490, 1991;

[22]    Kah-Chye Tan, Hock Lim and B.T.G. Tan, “Restoration of Real-World Motion-Blurred Images,” CVGIP: Graphical Models and Image Processing, Vol. 53, No. 3, pp. 291-299, 1991;

[23]    Hock Lim, Kah-Chye Tan and B.T.G. Tan, “Edge Errors in Inverse and Wiener Filter Restorations of Motion-Blurred Images and their Windowing Treatment,” CVGIP: Graphic Models and Image Processing, Vol. 53, No. 2, pp. 186-195, 1991.