Nippon Television Network Corp.

Hitachi, Ltd.

Nippon Hoso' Kyokai

Nittetsu Mining Co., Ltd.

Susumu Takayama

Yoshio Sugimori

Joji Urano

Hiroshi Miyazawa

Shigeo Matsuura

Yoshihide Kimata

Yasuie Mikami

Tadao Kurosaki

Reiichi Kobayashi

Katsuhiko Watanabe

Nobuyoshi Iyatomi

Yosai Araki

Masao Usui

Shigehiro Ito

Kazuhiro Tsuboi

Minoru Orikasa

A process for treating sodium hydroxide waste liquor containing aluminum, comprising the steps of: adding, to aluminum-containing sodium hydroxide waste liquor, at least one of MgO and Mg(OH).sub.2 in an amount of 0.5 to 3 moles with respect to 1 mole of aluminum to cause a reaction at 70.degree. C. or more; and separating and removing a precipitated magnesium-aluminum compound is disclosed. The present invention makes it possible to recover recyclable sodium hydroxide from an aluminum-containing sodium hydroxide waste liquor. Even if the recovering procedure is repeated, no carbonate ions are accumulated. Therefore, it is possible to prevent degradation of the treating solution containing sodium hydroxide. Further, the by-product is a useful compound, and thus, there is no problem in the reprocessing or disposal of the by-product.

Process for treatment of sodium hydroxide waste liquor containing

Characteristics of a color encoder can be measured under the same condition as a practical operation without modifying the color encoder as a device under test. A test signal generator generates R, G and B component signals as test signals and they are applied simultaneously to the color encoder. The output amplitudes and/or output phases of the component signals from the test signal generator are adjusted such that the color encoder produces at least one of a luminance signal, an I-axis signal and a Q-axis signal in accordance with a measurement item.

Color encoder measurement system with adjustment of amplitude ratio of

An apparatus for transmitting an NTSC color signal superposed with a signal corresponding to monochromatic characters with a colored contour, which is obtained from a color character super device, comprises a first circuit responsive the NTSC signal from the color character super device to determine an area on a television receiver screen on which signal out of NTSC signal standard may be displayed, a second circuit for deriving chrominance signal spectrum out of NTSC standard and means for gating the chrominance signal spectrum with an output of the first circuit and then for subtracting the gated chrominance signal spectrum from the NTSC signal to thereby at least reduce signal component thereof out of the NTSC standard signal.

Television broadcasting apparatus including monochromatic characters

A high resolution color television system, in the transmitting device of which part of pixels are thinned out in both horizontal and vertical directions and the remaining pixels are vertically gathered in the central portion of the image screen to form an image signal, leaving upper and lower blank portions, and horizontal and vertical informations indicating the quantitative relations between the removed pixels and the vertically and horizontally adjoining pixels are treated as first and second auxiliary signals and inserted in the upper and lower blank portions to form a television signal for transmission, and in the receiving device of which the image signal and the auxiliary signals are separated from the television signal and respectively treated in a manner opposite to that in the transmitting device to recover the original image signal for display by a kinescope.

High resolution color television system

For canceling ghost components disturbing a received picture signal waveform in the television transmission such as the television broadcast, ghost components of a reference pulse signal inserted at a central portion of a horizontal scanning period in a vertical blanking period of a picture signal is detected and then the received picture signal is processed such as those ghost components of the inserted reference signal are canceled by each other. In this signal processing, an auxiliary reference signal, the waveform and/or the level of which differ from those of the principal reference signal, the latter being occasionally almost zero, is inserted in a horizontal scanning period delayed from the principal reference signal by a repetition period after the lapse of which regular controlling signals such as synchronizing signals and color bursts having just the same waveform, level and phase reappear. In the differential signal waveform between received picture signals respectively neighboring both of reference signals, regular controlling signals are canceled by each other, while ghost components consisting of remaining waveforms except the difference between both of reference signals only are left, so as to facilitate the accurate detection of ghost components even exceedingly delayed over one half of a horizontal scanning period.

Method of detecting signal waveform disturbance in received television

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Tokyo, Japan

Susumu Takayama