In this paper, we propose a new wideband speech coder which combines the European standard of a narrowband speech coder, i.e., GSM-EFR, and a transform coder using the discrete wavelet transform. Input speech is first split into two bands with equal bandwidth. A subband coder with wavelet transformed speech is designed for a upper band coder, and a GSM-EFR coder is adopted as a lower band coder...

We present the Z Coder a new adaptive data compression coder for coding binary data The Z Coder is derived from the Golomb run length coder and retains most of the speed and simplicity of the earlier coder The Z Coder can also be thought of as a multiplication free approximate arithmetic coder showing the close relationship between run length coding and arithmetic cod ing The Z Coder improves u...

The image data compression has been an active research area for image processing over the last decade [1] and has been used in a variety of applications. This paper investigates the implementation of Low Power VLSI architecture for image compression, which uses Variable Length Coding method to compress JPEG signals [1]. The architecture is proposed for the quantized DCT output [5]. The proposed...

Although a system designer can use hardware description languages, such as VHDL (Chapter 6) and Verilog to program FPGAs, the algorithm developer typically uses higher-level descriptions to refine an algorithm. As a result, an algorithm described in a language such as Matlab or C is frequently reentered by hand by the system designer, after which the two descriptions must be verified and refine...

In image based rendering (IBR), a 3D scene is recorded through a set of photos which is then rendered to form novel views. Compression is essential to reduce the huge data amount of IBR. In this paper, we examine three categories of IBR compression algorithms: the block coder, the reference coder and the wavelet coder. We examine both the compression efficiency and the capability to render the ...

In image based rendering (IBR), a 3D scene is recorded through a set of photos, and a novel view is rendered by assembling data from the photo set. Compression is essential to reduce the huge data amount of IBR. In this paper, we examine three categories of IBR compression algorithms: the block coder, the reference coder and the high dimensional transform (wavelet) coder. It is observed that th...

{ We propose an adaptive rate allocation scheme to choose the rates of the source coder and channel coder pair optimally. We express the end-to-end expected distortion in terms of the source coder distortion and the channel distortion. Also, we propose a modiied Gilbert noise channel to model the combination of channel en-coder, channel, and channel decoder. Based on our new model, we estimate ...

This paper presents an efficient Harmonic-CELP hybrid coder at 2.4 kbps utilizing the well-known characteristics of the Harmonic and CELP coders. According to frame voicing decision, the proposed hybrid coder switches the RP-VSELP coder as a fast CELP in case of unvoiced, or an improved Harmonic coder in case of voiced. The proposed Harmonic-CELP hybrid coder has several features as follows: fa...