Hiroshi Yoshigi

Powder LSI: an ultra small RF identification chip for individual recognition applications

A powder-like 0.09 mm/sup 2/ 2.45 GHz RF identification chip for wireless recognition applications is described. This chip is fabricated in a 0.18 /spl mu/m CMOS process, and its thickness is 60 /spl mu/m. A two-surface connection technique is adopted to facilitate antenna attachment. The distance between the chip and a reader is 300 mm for a reader power of 300 mW.

A free time-shift DVD video recorder

A DVD video recorder is proposed that frees viewers from restrictions on when a program can be viewed by allowing a program to be played while the recorder continues to record other programs. This recorder also makes recording, viewing, searching and managing programs much easier than with a conventional VCR. The recorder consists of two MPEG1+ video encoders, one MPEG2 decoder, a DVD drive with a disk changer, and a hard-disk-drive.

Experiments on Proposed Extended-Definition TV with Full NTSC Compatibility

Le systeme propose offre une haute definition a la fois verticale et horizontale, est applicable a la television par câble, a la television en circuit ferme, au stockage video et a la diffusion directe par satellite

Improved synthetic motion signal for perfect motion-adaptive pro-scan conversion in IDTV receivers

A synthetic motion signal was previously proposed to perfect proscan conversion (see N. Suzuki et al., J. ITE, vol.42, no.9, p.966-972, 1988). Good conversion characteristics were obtained without any modification of current IDTV (NTSC) receivers, and new standards were not required. This signal was found to be only slightly visible in highly saturated image areas. An improved multiplexing method is proposed for reducing the disturbance caused by the synthetic motion signal, especially in such areas. This is accomplished by adding the signal to a linear main signal. Hence, the synthetic motion signal does not leak to other components on the display, and disturbance is minimized. Subjective assessment showed that this method is clearly effective. >

Fully compatible EDTV for improving both Y and color signals by using a single new subcarrier

An enhanced-definition TV (EDTV) is discussed in which the resolution of a Y signal is extended both horizontally and vertically. Horizontal extension is a achieved by inserting the information into the so-called Fukinuki hole, and vertical extension by progressive interlace scan conversion. The resulting improvement in color signals is studied and a scheme for extending the bandwidth of a Q signal appropriate to the proposed EDTV system is proposed. The relationship between various methods of extension is clarified. >

Film Mode Signal Processing for EDTV-II and Subjective Assessments.

The authors have already proposed introducing “film mode” signal processing into EDTV-II. In the mode, I-P (interlaced to progressive) scan conversion of film images can be theoretically improved without a VT helper signal by using a reserved bit of the EDTV-II signaling codes as a film mode signaling code. In this paper, they propose an improved signaling method which can be applied to various frame rates of original films by indicating whether the current field has been generated from the same film frame as the previous field. They also implemented a signaling code regenerator and a film mode I-P scan converter, and clarified picture quality by using subjective assessments. The assessments showed that the picture quality decoded in the film mode was generally better than the one in the current EDTV-II mode.

Study on signal processing for progressive-interlace scan conversion using a progressive TV camera.

現行インタレース走査系の画質妨害の低減について, 順次走査カメラの信号を使用した順次-インタレース走査変換の信号処理により可能な機能を検討した.まず, 走査を垂直・時間周波数領域での標本化の観点から3次元周波数解析を行い, インタレース折り返し歪みの除去, 時間周波数30Hzの動きの処理, 垂直補強信号による解像度向上などが, 順次走査カメラの導入によって初めて実現可能になることを明らかにした.次に, 時空間フィルタに垂直方向フィルタを使用して, 動解像度特性を損なうことなくこれらの機能を実現する具体的な走査変換の手法を検討した.そして, 試作装置を用いた評価実験により有効性を検証した.

Characteristics of EDTV encoders using an interlaced scanning TV camera.

現行インタレース走査系の信号を用いたEDTVエンコーダの諸特性について検討した.初めに, コンポジットNTSC信号, コンポーネント3原色信号の2つの信号形態に対して実現可能な機能, 特性を明らかにした.また, 筆者らの提案による高精細情報の多重, 時間・垂直周波数領域でのPre-Combing処理などの機能実現に必要な具体的な信号処理の手法を示した.そして, 試作装置を用いた評価実験により, 静止画像に対し500TV本程度の水平解像度が達成可能なこと, Pre-Combing処理では, 動解像度特性をあまり損なうことなくクロスカラーが大幅に低減可能なことを確認した.この結果, 現行のテレビカメラにアダプタ形式で対応可能なEDTVエンコーダ実現の技術的見通しが得られた.また, Pre-Combing処理は現行方式の画質改善にも有効なことが明らかになった.

Multiplexing of synthetic motion signals in a color encoder for scan conversion.

IDTV, EDTV受像機では, 動き適応輝度・色差信号分離, 動き適応 “インタレース走査-順次走査” 変換が行われる.これらの特性は, 画質を決める要因となるとともに, 動き検出の精度に大きく左右される.しかし, インタレース走査信号では, 原理的に静止か動きかが識別不能な動きが存在する.そこで従来は, 動きの時空間方向の相関を利用して, 動きと判定する領域を時空間方向に拡大することにより救済していた.しかし, この手法では自ずと限界がある.一方, 順次走査カメラでは, 上記の動きを検出することが可能である.そこで, 順次走査カメラによるエンコーダにおいて受像機側で検出できない動きを抽出し, その領域に擬似動き信号を視覚的に目立たない形で映像信号に多重する方式を提案する.試作実験の結果, 受像機側での動きの誤判定がほとんどなくなり, 良質な画質を得ることができた.

Digital Locking of Sampling Frequency and TV Scanning

テレビ電話における走査周波数と標本化周波数をPLOやバッファメモリーを用いずに, 全ディジタル的にロックする方式を提案した.本方式を1MHzテレビ電話信号を4ビットDPCM符号化して伝送するものに適用し, 実験を行った.その結果, ノンロックにくらべて画質は5段階評価値にして約1段階向上した.