Sony Corporation

Takatomo Nagamine

Satoshi Kobayashi

Satoshi Miura

Shinji Takahashi

Junya Saito

Tsutomu Kume

Jun Ueshima

Takahiko Tamura

Yumiko Mito

A video signal-processing device that can improve the apparent contrast of the luminance signal at a television receiving set includes a quantity of black expansion computing section for computationally determining the quantity of black expansion when the luminance component of the input video signal is not higher than a first luminance level, a gain controller for regulating the quantity of black expansion as computationally determined by the quantity of black expansion computing section, a quantity of black expansion adding section for generating an output video signal by adding the quantity of black expansion regulated by the gain controller to the luminance component of the input video signal, and a vertical span adding block for integrating the luminance component of the output video signal not higher than a second luminance level for a field. The gain controller regulates the quantity of black expansion according to the luminance component integrated by the vertical span adding block to improve the apparent contrast of the luminance signal at the television receiving set by accurately expanding black.

Device and method for processing video signals to improve the black contrast

When an A/D-converted composite video signal is directly outputted while a system clock frequency is switched so as to execute the determination of a signal system, a digital chroma demodulation system prevents the images displayed by the composite video signals from being distorted in accordance with a switching of the frequency of a system clock. The frequency m (=fsc&#xd7;n) of the system clock is synchronized with a color burst signal and is set to fall in a predetermined range by changing a coefficient n in accordance with the system color burst signal freguency. Thus, since a composite video signal is A/D-converted in accordance with a substantially constant sampling frequency, the sampling condition such as a sampling frequency and a sampling point is not greatly changed.

Video signal processing circuit and video signal processing method

There can be solved a problem in which a lock range is narrowed by using an oscillator such as a ceramic having a high Q and a horizontal deflection frequency generating system compatible with all horizontal deflection frequencies of a variety of television systems cannot be formed without difficulty. This system includes a frequency-fixed oscillator oscillating at a frequency f sufficiently higher than a deflection frequency fh in a multi-scan display, a first counter for counting a clock outputted from said oscillator in a descending order, a duration in which an integer n which results from rounding a decimal point of a value obtained by a division of f fh is divided by an integer m smaller than n and said first counter counts a value k thus obtained k times is set to one cycle and a duration in which a second counter for counting a value m times repeats the counting m cycles is set to one period and thereby generating a deflection frequency fh.

System for generating horizontal synchronizing signal compatible with multi-scan

The signal processing apparatus for setting a vertical blanking signal of the television set that allows to set the beginning position and end position of a horizontal blanking signal irrespective of the numbers of lines in the vertical synchronous signal interval, comprising: an up counter for counting the vertical synchronous signal interval, synchronizing with the horizontal synchronous signal to lock forcedly the interlace signal to become a non-interlace signal; and a down counter for loading and down counting the count value of the up counter, wherein the down counter loads the data of the up counter immediately before the up counter is reset at a timing of the vertical synchronous signal and down counts the data which is loaded in the down counter as the initial value.

Signal processing apparatus for setting up vertical blanking signal of television set

A horizontal electron-beam deflector capable of preventing circuits from being damaged due to disturbance such as electric discharge with a simple and small circuit configuration, wherein an AFC circuit inputs a control signal indicating a frequency from a computer, the control signal is output to a deflection circuit, the AFC circuit generates a horizontal synchronization pulse signal, and the deflection circuit generates a horizontal deflection signal while controlling a voltage by using the control signal input from the AFC circuit.

Horizontal electron-beam deflector, automatic frequency controller, and video signal receiver

A ghost cancelling receiver using ghost cancel reference signal is constructed so that a ghost wave component is adaptively separated from a received video signal on the basis of the level of a noise component thereby to properly cancel the ghost.

Ghost cancelling receiver using ghost cancel reference signal

A circuit for detecting a wave distortion in a circuit for eliminating a ghost wave component, wherein a received video signal is applied to a transversal filter, a reference signal for cancelling a ghost signal (GCR signal) is taken out from an output signal from the transversal filter, a ghost wave component is picked up from the GCR signal, a signal for controlling a transmission characteristic of the transversal filter is formed on the basis of the picked-up ghost wave component, and the control signal is applied to the transversal filter to thereby extract from the filter a video signal from which the ghost wave component is cancelled. This circuit includes a variable limiter provided on a signal line for transmitting the control signal to the transversal filter and an unit for controlling a limiter level of the variable limiter to be decreased with time.

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Chiba, Japan

Takatomo Nagamine