Abstract: A power source apparatus includes first equalizing circuits to control remaining charge capacity variation among a plurality of battery units, and second equalizing circuits to control remaining charge capacity variation among all the series-connected battery packs that make up each battery unit. A first equalizing circuit connects each battery unit with an output line OL through a first series circuit made up of a first limiting resistor and first equalizing switch. Remaining charge capacity variation is equalized among all the battery units by the first equalizing circuits, and remaining charge capacity variation between battery packs in each battery unit is controlled by the second equalizing circuits.

Abstract: The power source apparatus configuration can be changed to adapt to the installation site and environment. The power source apparatus is provided with first equalizing circuits 14 to control remaining charge capacity variation among a plurality of battery units 10, and second equalizing circuits 24 to control remaining charge capacity variation among all the series-connected battery packs 20 that make up each battery unit 10. A first equalizing circuit 14 connects each battery unit 10 with an output line OL through a first series circuit made up of a first limiting resistor 15 and first equalizing switch 16. Remaining charge capacity variation is equalized among all the battery units 10 by the first equalizing circuits 14, and remaining charge capacity variation between battery packs 20 in each battery unit 10 is controlled by the second equalizing circuits 24. (Cell balancing is performed quickly and efficiently.

Abstract: A battery pack including a thin outline battery in an external case. The external case is provided with openings exposing the front and back of the thin outline battery to the outside, and is formed in the shape of a rectangular frame which covers both sides and both ends of the thin outline battery. The thickness of the external case is essentially equal to the thickness of the thin outline battery, or the external case is made thinner than the thin outline battery.

Abstract: The battery pack holds a thin outline battery in an external case. The external case is provided with openings exposing the front and back of the thin outline battery to the outside, and is formed in the shape of a square frame which covers both sides and both ends of the thin outline battery. The thickness of the external case is essentially equal to the thickness of the thin outline battery, or the external case is made thinner than the thin outline battery.

Abstract: A method of displaying the full-charge-state of a battery according to the invention is characterized in that the displaying is retarded by a predetermined period of time after the full-charge-state is detected. According to the method, the delay time is so determined that the battery which requires a shorter charging time needed to full-charge the battery has a longer delay time period than the battery requiring a longer charging time.

Abstract: A method of displaying the full-charge-state of a battery according to the invention is characterized in that the displaying is retarded by a predetermined period of time after the full-charge-state is detected. According to the method, the delay time is so determined that the battery which requires a shorter charging time needed to full-charge the battery has a longer delay time period than the battery requiring a longer charging time.

Abstract: The method of charging a plurality of batteries uses a charging power supply to pulse charge a plurality of batteries to full charge by time-division switching of the battery being charged. Further, this charging method moves timing intervals forward to begin charging the next battery when charging of a fully charged battery is stopped.

Abstract: The method of charging a plurality of batteries uses a charging power supply to pulse charge a plurality of batteries to full charge by time-division switching of the battery being charged. Further, this charging method moves timing intervals forward to begin charging the next battery when charging of a fully charged battery is stopped.

Abstract: A battery pack comprises at least one rechargeable battery, a secondary coil which is magnetically coupled to a primary coil housed in a charging stand, and a control circuit which controls power induced in the secondary coil and charges the rechargeable battery. Alternating current (AC) generated in the secondary coil housed in the battery pack is controlled by the control circuit to charge the rechargeable battery.

Abstract: The battery charging apparatus is provided with a charging power supply for electric power to charge rechargeable batteries, a first battery attachment section positioned close to the power supply, a second battery attachment section positioned further away from the power supply, and a charging controller which fully charges a rechargeable battery in the first battery attachment section faster than a rechargeable battery in the second battery attachment section.

Abstract: In the method of charging a plurality of lithium ion rechargeable batteries, if another battery is attached during battery charging, open circuit voltages of those respective batteries are measured and compared. When the open circuit voltage of the battery attached later is greater than that of the battery being charged, charging of the previously attached battery is suspended and the battery attached later is given priority and charged. When the open circuit voltage of the battery being charged is greater than that of the battery attached later, the battery being charged is given priority and charged.

Abstract: A secondary battery is charged with a constant voltage, while a charging current generated by the application of the constant voltage is monitored. After the charging current becomes smaller than a predetermined current value, an open circuit voltage of the secondary battery is sampled at a predetermined interval while substantially stopping charging. Charging is completed, when either a voltage difference between a terminal voltage of the secondary battery and the sampled open circuit voltage becomes smaller than a predetermined voltage difference value, the sampled open circuit voltage becomes bigger than a predetermined voltage value, or, a remaining charging time of a timer which is calculated based on the sampled open circuit voltage has elapsed. The method shortens the charging time and enables the correct detection of the fully charged state.

Abstract: Supplied selectively to a recording system circuit of a VTR are a first component signal comprising three primary color signals R, G and B and a second component signal comprising a luminance signal Y and two types of color difference signals P.sub.B and P.sub.R. The first and the second component signals pass through a group of LPFs (1, 2, 3) having the same pass characteristics and then are A/D converted at the same sampling clock. The component signal converted into a digital signal is applied to a matrix circuit 11. Respective coefficients of the matrix circuit are switched according to a type of the inputted component signal, and as a result, a second digital component signal is always outputted at a fixed delay time from the matrix circuit. Two color signal data which are over-sampled included in the second digital component signal are applied to decimation digital filters 14 and 15 to reduce data densities thereof.

Abstract: A reproduced video signal of a VTR is applied to a jitter compensation circuit (100). The applied reproduced video signal is A/D converted by a phase modulated clock and after subjected to the adjustment of timing, the signal is written into a memory (4). A burst signal period is specified based on a timing of a horizontal synchronizing signal in the reproduced video signal and a jitter amount is detected based on a sampling phase of the A/D converted burst. Jitter compensation data is calculated based on this jitter amount. On this occasion, latest jitter compensation data is obtained based on the detected jitter amount and the jitter compensation data one horizontal period before. A timing for starting to write the A/D converted video data into the memory is defined based on high-order data of the calculated jitter compensation data, thereby cancelling large jitter components.

Abstract: A focus area change circuit is provided with a vertical comparator (50) which compares coincidence of count values of a vertical counter (45) with designated vertical positions of a focus area and a horizontal comparator (51) which compares count values of a horizontal counter 49 with designated horizontal positions. A sampling pulse generator (52) generates sampling pulses on the basis of vertical and horizontal comparison outputs, which are respectively expanded for generating expansion sampling pulses. A selection circuit (56) selects the sampling pulses or the expansion sampling pulses so that a sampling circuit (32) samples outputs of a video camera on the basis of the sampling pulses or the expansion sampling pulses as selected. A focus motor is controlled to maximize the sampling outputs. Thus, the sampling pulses or the expansion sampling pulses are selected in response to the state of the object of image formation, thereby to enable selection of the focus area.