Kenji Tsunashima

An Integrated Dtv Receiver For Atsc Digital Television Standard

This paper describes a system structure of a DTV receiver capable of decoding a terrestrial broadcast signal which conforms to the ATSC digital television standard. A newly developed chip set is used to realize a compact decoder unit.

Two channel FM recording for high-definition baseband signals

The two-channel three-segment recording method previously developed for high-definition TV (HDTV) baseband VCR recording is considered. The following aspects of this recording method are investigated: the determination of appropriate FM allocation that matches the characteristics of the tape-head system, the use of rotary head amplifiers and a cosine equalizer, and the correction of characteristic differences between the two channels. A signal-to-noise ratio of over 40 dB has been achieved, and the jitter and moire are imperceptible. >

New compensation method for level and non-linear distortion of high-definition VCRs

A novel method to adjust the amplitude of reproduced signals transmitted through an analog channel with nonlinear distortion has been developed. This method has been found to improve the picture quality of high-definition (HD) VCRs. This method achieved good compensation even under low signal-to-noise ratio, and was not affected by time base error of reproduced signals. All processing was carried out by a microprocessor without extra circuits, thus keeping the scale of the compensation circuit small. The compensation signal can be transmitted through a narrowband channel; therefore, this method can be widely applied. >

High resolution MUSE-NTSC converter

The frequency characteristic of a simplified interpolation algorithm of MUSE is analyzed. The result of the analysis is applied to a MUSE-NTSC conversion system to realize high resolution. The system also achieves a reduction in the amount of hardware because of the simplified algorithm. >