Pioneer Electronic Corporation

Toshio Gotoh

Yoshiaki Moriyama

Hideki Hayashi

Akihiro Ono

Kaname Abe

Sumitaka Matsumura

Kenji Yamagata

A drop-out detector circuit for use in a device such as a video disc player or the like is provided using a minimum of added components. The input analog signal read from the disc is compared with the upper and lower (maximum and minimum) reference levels provided for the A/D converter otherwise provided for converting the input analog signal to digital form. When either limit is exceeded, a drop-out signal is generated.

Circuit for detecting signal loss, or drop-out, in a digital signal

A drop-out detector circuit for use in a data reproducing device in which a reproduced high-frequency signal is digitized. The most significant bit of the digitized signal is sampled, and its logic state detected over a predetermined number of sampling periods. Both high- and low-frequency drop-outs can be detected from the detected logic state pattern of the most significant bit.

Detector circuit for detecting drop-out in reproduced digital data

A digital television circuit in which the analog FM video signal is first digitized and all processing is performed digitally, including FM demodulation. Clocks at the subcarrier frequency and four times this frequency are synchronized with the horizontal synchronizing circuit or color burst signal.

Fully digitized video signal reproducing apparatus

A method for recording and reproducing video and accompanying audio information whereby various reproduction modes are made possible, including displaying a still image with appropriate sound, without adversely affecting the quality of the played-back signals. A video format signal, containing two-dimensional image information, is divided into a plurality of blocks. Audio information is inserted into predetermined ones of these blocks, and video information is inserted in the remaining blocks. The video format signal is recorded in this form on a magnetic medium. Upon reproduction, the blocks into which the audio information was inserted are, for video reproduction, either masked or replaced with other video information. Control information, including information correlating the audio and video information and, preferably, error correcting code information, is also recorded.

Growing community of inventors

Saitama, Japan

Toshio Gotoh