Abstract: A picture tube drive apparatus for driving a color picture tube. The picture tube drive apparatus comprises a video output circuit which receives video signals, amplifies them and outputs the amplified video signals, a picture tube drive circuit which receives the video signals amplified by the video output circuit for driving said color picture tube based on video signals, said picture tube drive circuit having means for detecting a beam current corresponding to the brightness of each color flowing through said picture tube, a picture tube connected with said picture tube drive circuit for displaying the video signals, a white balance control circuit into which a detection value of a beam current detected by said picture tube drive circuit is inputted and for outputting video signal level compensation signals for adjusting the white balance of the video image displayed on said picture tube to said picture tube drive circuit.

Abstract: A picture tube drive apparatus for driving a color picture tube. The picture tube drive apparatus comprises a video output circuit which receives video signals, amplifies them and outputs the amplified video signals, a picture tube drive circuit which receives the video signals amplified by the video output circuit for driving said color picture tube based on video signals, the picture tube drive circuit having a detector for detecting a beam current corresponding to the brightness of each color flowing through the picture tube, a picture tube connected with the picture tube drive circuit for displaying the video signals, a white balance control circuit into which a detection value of a beam current detected by the picture tube drive circuit is inputted and for outputting video signal level compensation signals for adjusting the white balance of the video image displayed on the picture tube to the picture tube drive circuit.

Abstract: A vertical deflection circuit of the negative feedback type wherein a feedback signal, being generated at a terminal of a deflection current detector resistance connected in series with a vertical deflection yoke, is connected to negative feedback amplifier which guides the output of a sawtooth wave generating circuit through a third order distortion wave generating circuit. The third order distortion wave generating circuit imparts third order distortion of positive polarity to said feedback signals, so that third order distortion of negative polarity is imparted to the current of said deflection yoke, and whereby the third order distortion is compensated and extinguished on the CRT display.

Abstract: An AGC circuit used in a subscriber's receiver of a CATV system in which the television signal is scramble-modulated so that only subscribers are allowed to view toll programs, wherein the detected video signal is conducted through a low-pass filter to extract the vertical sync signal, a keying pulse is produced in response to the vertical sync signal, and the AGC operation is performed by the keying pulse in accordance with the magnitude of the vertical sync signal.

Abstract: A first electronic apparatus is provided with a relay energized at a low voltage, the relay having a contact connected in parallel with a power supply switch for the first electronic apparatus. The first electronic apparatus is further provided with a signal generator circuit for energizing a second electronic apparatus. An output signal generated from a third signal generator circuit of a third electronic apparatus is applied to the coil of the relay of the first electronic apparatus thereby to operatively interlock the first electronic apparatus with the third electronic apparatus. Alternatively, an output signal generated from a signal generator circuit of the first electronic apparatus is applied to a relay of the second electronic apparatus having a contact through which power is supplied to the second electronic apparatus, thereby operatively interlocking the second electronic apparatus with the first electronic apparatus.