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Diabetes can cause damage to the retina's blood vessels in the eye leading to diabetic retinopathy (DR). The images captured using a fundus camera are used to segment and study the blood vessel damage. Once the retina is damaged, it cannot be repaired. Therefore, early detection of blood vessel damage is the only way to control the progression of the disease. It allows physicians to provide timely...
This paper proposes an algorithm for design of multichannel wiener filter for the application of hearing aids (HA). Present hearing aid devices amplify the speech signal which is corrupted by disturbances and noise from the same environment, resulting degraded speech quality and less efficiency of such devices. Application of wiener algorithm in HA device provides improved speech quality with less...
Subband coding (SBC) is a one of the popular application to filter banks to achieve multi-channel data compression. There are data independent and data dependent filter banks in the literature. In this paper, we focus on the design of data dependent M-channel maximally decimated Paraunitary (PU) filter bank using polynomial eigen value decomposition (PEVD) technique for SBC. To design this type of...
This paper proposes an algorithm for matrix wiener filter for speech processing in case of hearing aids. Hearing aid (HA) devices currently used are less efficient as environmental noise already added into speech signal corrupts it and heard by listener. Introducing wiener filter in HA device allows reducing noise to particular level. By increasing number of secondary channels can enhance the performance...
Filter Banks traditionally designed by the factorization method which is complex and time consuming. Singular valued decomposition technique is introduced to design Linear Phase Orthogonal filter bank which yields efficient and fast results in time critical applications. Signal splitting and efficient reconstruction of the original signal is studied achieving perfect reconstruction condition due to...
Multicarrier modulation (MCM) is a popularly used transmission technique. This paper aims at designing the multicarrier modulation pulse for communication over a Doubly Dispersive (DD) channel. For a DD channel, Inter Symbol Interference (ISI)\Inter Carrier Interference (ICI) can be completely eliminated only when we design the pulses with the knowledge of the channel state. But for a quickly varying...
In this paper, we proposed an analysis of Eigen functions of the n-Dimensional Fourier transform. We extended the theory developed in our previous publication [1]. We applied our extended theory of systematic construction of Eigen function concept for sine and cosine functions. We explained the concept in a clear way through example construction of Eigen functions of 1-D and 2-D Fourier transform...
In this paper, we extend the concept of Eigen functions of the Fourier transform discussed by P. P. Vaidyanathan [9]. But for a scaling factor, if there is no change in the function after the application of the Fourier transform, we term them as Eigen functions of the Fourier transform. Gaussian is the well known Eigen function. But, there are various other functions that can be developed systematically...
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