Hiroaki Matsumoto

TL;DR: In this paper, a video signal AGC circuit including an analog gain control amplifier for adjusting the level of an input analog video signal, an A-D converter for converting the output of the analog gain controller amplifier to a digital video signal; a sync level detector for detecting the sync level of the digital video signals outputted from the A-d converter; a digital gain control amplifier and a first control signal generator for generating a first controller signal to adjust the gain of the analogue gain control controller on the basis of the outputs of the syn-level detector.

TL;DR: In this article, a level detector detects the level of the input signal, and a control signal generator generates first and second control signals based on the detected output of the level detector, and supplies the first control signal to the level limiter so as to control the limit level thereof, and the second control signal is added with reversed polarity to suppress the noise contained in the input signals and thereby produce a low-noise output signal.

TL;DR: In this paper, an input video signal is coupled to luminance and/or chroma digital signal processing circuits which are supplied with luminance or chroma adjustment control data, respectively.

TL;DR: In this article, a digital camera apparatus has an analog emphasis circuitry arranged such that when an output from a charge-coupled device (CCD) forming the imager and cooperating with a complementary color, checkered pattern filter is processed in a digital fashion, an analog carrier chrominance signal component is emphasized before being converted to a digital signal, thus making it possible to reduce adverse influence caused by quantization noise.

TL;DR: A color signal matrix circuit for producing first and second color difference signals from three primary color signals employs a reduced number of digital circuit elements and includes a first subtractor for producing a first color subtraction signal based on red and green primary colour signals, a second subtractor and a third subtractor supplied with the second color subtraction signal from the third level adjuster and the first color subtractraction signal from a fourth level adjustor.