Informatics Publishing Limited

Ganapathi Hegde ¹, Pukhraj Vaya ¹

Affiliations
1 Department of ECE, Amrita Vishwa Vidyapeetham, Amrita School of Engineering, Bangalore-560035, IN

Abstract

This paper presents an efficient high speed, low power 3-Dimensinal Discrete wavelet transform (3-D DWT) architecture for video coding applications. 3-D DWT architecture is designed for 8*8*8 video frame, based on fast lifting scheme approach using (5/3) wavelet filter. It reduces the hardware complexity, memory accesses and achieves good quality of reconstruction for images. Sub blocks of the architecture are modeled in Verilog Hardware description language (Verilog HDL). The Application specific integrated circuit (ASIC) implementation results of 3-D DWT show that the proposed architecture achieves 29% improvement in power and operates at a maximum frequency of 380MHz. It can be used as a full custom design for video processing application.

Keywords

3-D DWT, Lifting Scheme, ASIC, Video Processing.

Full Text

     

Tan Chee Leong ¹, Pukhraj Vaya ²

Affiliations
1 School of Photonics Science, Gwangju Institute of Science and Technology (GIST), 261 Cheomdan- Gwagiro (Oryong-dong), Buk-gu, Gwangju, 500-712, KP
2 Department of Electronics and Communication, Amrita School of Engineering, Kasavanahalli, Bangalore, IN

Abstract

A hybrid bistable semiconductor laser structure consisting of an edge emitting laser as a gain region and a vertical cavity laser as an absorber region, which translates lateral emission to vertical emission is analyzed. The device is modeled using appropriately modified rate equations and simulated using PSPICE circuit simulator. The dc sweep exhibits bistability. The hysterisis width of the bistable characteristics is found to depend on the reverse dc sweep, source resistance, and temperature. It is also noticed that the threshold currents and the hysterisis width can be controlled by the physical dimensions of gain and absorber regions and the driver circuit parameters. Turn-on delay decreases as the input current is increased.

Keywords

Optical Bistability, Edge Emitting Laser, Vertical Cavity Laser, Threshold Current, Hysteresis Width.

Full Text