Masato Fuma

A single chip decompression LSI based on ATRAC for mini disc

A single chip that decompresses the ATRAC (adaptive transform acoustic coding) used for mini disc has been developed. The authors outline how the low power consumption and high-precision calculation capability of this LSI were achieved. This LSI was developed by making an ideal compromise between lower power consumption and efficient high-precision calculation. Calculation precision has been enhanced due to 24-bit block-floating-point calculation, a customized calculation unit, and an error concealment function. >

A newly developed single-chip LSI for HD DVD/DVD/CD

This paper describes the single-chip LSI for HD DVD/DVD/CD, which we have developed. Since the demand for high-capacity media that can record high-definition movies for an extended time is increasing, HD DVD has been rapidly developed as the next-generation DVD. To achieve downsizing and low power consumption of the LSI, we developed a single-chip LSI which includes an HD DVD signal processing circuit, DVD/CD signal processing circuit and CPU. The new digital read channel provides high readout performance for HD DVD signal which has high intersymbol interference. A progressed ECC (error correction code) core contributes to the LSI downsizing.

Turbo codes for zero field MAMMOS

We have developed a turbo codes module for zero field MAMMOS and a simulation system to examine the performance of a turbo codes module for the zero field MAMMOS readout signal. In the zero field MAMMOS readout channel, issues such as dropouts and edge-shifts may determine the bottom of the error rate when the recording density reaches a certain height, and also reduce the performance of turbo codes. In order to improve the performance of turbo codes to deal with these issues, we propose an improved turbo codes. We first confirmed the performance of the turbo codes module, simulated for the additive white Gaussian noise channel modesl, and then we investigated the performance for the zero field MAMMOS readout channel. With respect to code rates and number of iterations, the turbo decoding results of zero field MAMMOS readout channel against the conventional binarization method are presented. Finally, we present the performance of improved turbo codes and confirm the effectiveness of the improvement.