摘要:
A wireless communication system capable of using a plurality of frequency channels in a first predetermined frequency band being adjacent a second predetermined frequency band used in another wireless communication system, the wireless communication system includes a base station and a mobile station. The base station sends a notification for limiting each power of the plurality of frequency channels to the mobile station. The mobile station transmits data to the base station by the use of at least one of the frequency channel, and controlling data transmitting power based upon the notification. When the frequency channel for the data transmitting need more transmitting power and the frequency channel for the data transmitting is adjacent to the second predetermined frequency band, the mobile station change the frequency channel for the data transmitting.
摘要:
A projection type display apparatus that projects video onto a screen includes a liquid crystal panel using polymer-dispersed liquid crystal that disperses light when a voltage is applied and that transmits light when a voltage is not applied, being attached to an apparatus body 2 as a screen 1; and the video output from the apparatus body 2 is projected onto the screen 1 from the front side. Accordingly, there is provided the projection type display apparatus suitable for use in small space such as at home, in which a place for setting the apparatus is flexibly selected and the feeling of oppression is mitigated when the apparatus is not used.
摘要:
A lighting apparatus is provided. The lighting apparatus includes a power supply housing section, a circuit board housing section, a light source housing section, a cutout portion, and a light source. An image recorded on a record medium is displayed in the state that an end portion of the power supply housing section and an end portion of the record medium secured to the cutout portion are placed on a surface where the lighting apparatus is placed.
摘要:
A transmission/reception apparatus consists of a transmitter section including a gain amplifier which amplifies a gain of the transmission signal, power amplifier which amplifies the output of the gain amplifier, and transmission monitor signal extractor which extracts a transmission monitor signal from the transmission signal produced by the power amplifier, a receiver section including a coupler which couples the output of the transmission monitor signal extractor to the reception signal, low-noise amplifier which amplifies the output of the coupler, and separator which separates the output of the low-noise amplifier, and a controller including at least a gain controller which controls the gain amplifier based on a prescribed control reference and the output of the separator. The apparatus is capable of controlling the transmission output in a wide range by amplifying a weak transmission monitor signal in the receiver section.
摘要:
An outdoor unit of a transmitter-receiver apparatus notifies an indoor unit of normal operation by transmitting an unmodulated carrier to the indoor unit via a cable when operation is normal, notifies the indoor unit of an abnormality by transmitting a monitor signal, which is obtained by modulating a carrier by alarm data, to the indoor unit when operation is abnormal, and restores the carrier to the unmodulated state at recovery from the abnormality. Further, the indoor unit transmits an unmodulated carrier to the outdoor unit via the cable if it is unnecessary to send a control signal, and transmits a modulated control signal, which is obtained by modulating a carrier by control data, to the outdoor unit via the cable if it is necessary to send a control signal. As a result, phase noise and the characteristic of spuriousness in the vicinity of the local oscillation frequency are unaffected even if the unmodulated carrier leaks into the reference frequency signal system. As a result, no deterioration is caused in the quality of the communication system.
摘要:
A signal transmission device having ALC function includes a detection circuit for output level detection when used in a multi-carrier :system where the number of carriers changes. The signal transmission device further has a variable attenuator for controlling a level of a transmission signal. A transmission circuit is coupled to the output of the variable attenuator for modulating a local oscillation signal with the output of the variable attenuator and for generating a modulated output signal. The detection circuit is provided with the modulated output signal for generating a detection voltage. The detection circuit includes a diode having a square-law characteristic region. A reference voltage generating circuit receives an information signal indicative of the number of carriers for generating a reference voltage corresponding to the number of carriers. A first control circuit is provided, receiving the detecting voltage and the reference voltage, for generating and supplying, to the variable attenuator, a first control signal of a difference between the detection voltage and the reference voltage. A second control circuit is supplied with the information signal indicative of the number of carriers, for generating and supplying, to the detection circuit, a second control signal corresponding to the number of carriers, whereby the square-law characteristic region of the diode in the detection circuit is shifted responding to the second control signal.
摘要:
There is provided a power supply method including an initial setting step of performing, by a charging control device, initial setting on a plurality of battery devices each including a secondary cell therein and a charging device performing contactless power transmission to transmit power to the battery devices that are provided in a stacked manner, a power transmission instruction step of providing, by the charging control device, an instruction to start the contactless power transmission from the charging device subjected to the initial setting in the initial setting step to the battery devices, a contactless power transmission step of performing the contactless power transmission from the charging device to the battery devices and a charging completion step of notifying, when charging of the battery devices is completed, the charging control device of completion of the charging by the battery devices.