Casio Computer Co., Ltd.

Toshio Hanabusa

Jun Muraki

Naoto Toda

A wireless synchronous system includes an apparatus and a sensor device. The apparatus has a radio communication unit for performing synchronous communication with an external apparatus. The apparatus generates a radio synchronizing signal having a predetermined cycle synchronized with the synchronous communication and determines a timing of controlling the apparatus based on the radio synchronizing signal. The sensor device has a radio communication unit for performing synchronous communication with the external apparatus. The sensor generates a radio synchronizing signal having a predetermined cycle being synchronized with the synchronous communication, obtains detection-data representing a state of the sensor device, and determines a timing of obtaining the detection-data in accordance with the radio synchronizing signal.

Wireless synchronous system, radio apparatuses, sensor devices, wireless synchronizing method, and computer-readable recording medium

Plural image pickup apparatuses can take images in accurate synchronization. An image pickup apparatus is provided with an image pickup unit for obtaining image data, a communication unit for communicating with another image pickup apparatus in synchronization, a synchronous signal generating unit for generating a synchronous signal having a predetermined cycle and synchronized with a timing of a synchronous operation by the communication unit, an image-pickup synchronous signal generating unit for generating an image-pickup synchronous signal having a predetermined cycle and synchronized with the synchronous signal generated by the synchronous signal generating unit, and an image-pickup controlling unit for determining in accordance with the image-pickup synchronous signal generated by the image-pickup synchronous signal generating unit, image-pickup timings at which the image pickup unit obtains image data.

Image pickup apparatus, image pickup system, image pickup method and computer readable recording medium implementing synchronization for image pickup operations

A reception apparatus includes a first determination unit to determine whether a state exists in which timing information and six orbital elements information can be obtained from GPS signals transmitted by only two GPS satellites. When the state exists, a calculation unit calculates a trajectory line having a predetermined width on a surface of the earth, based on the GPS signals transmitted by the two satellites. A second determination unit determines whether the trajectory line traverses a district of use stored by the apparatus. A time correcting unit obtains a current time using the obtained timing information, by correcting the timing information based on a time zone corresponding to the district of use, when the trajectory line traverses the district of use. The time correcting unit does not obtain the current time using the obtained timing information when the trajectory line does not traverse the district of use.

GPS reception apparatus and positional calculation method for the same

A wireless television system includes a transmitting device that transmits by wireless transmission a digital broadcast signal obtained by receiving a digital broadcast of a plurality of channels, and a wireless television receiver. The wireless television receiver can directly receive the digital broadcast, and can receive a digital broadcast signal carried in a LAN signal transmitted by the transmitting device. The wireless television receiver compares received levels and error rates of a digital broadcast signal received directly, and digital broadcast signals of a same channel as that of the digital broadcast signal received directly. based on a result of the comparison, the wireless television receiver selects and outputs a digital broadcast signal with a highest received level or a lowest error rate from among the plurality of digital broadcast signals of the same channel.

Wireless television system

A reception unit receives global positioning system signals transmitted by a plurality of satellites to obtain satellite information. A determination unit determines whether or not a state in which the reception unit receives the global positioning system signals is a predetermined reception state. A positional calculation unit calculates a current position based on ephemeris information and almanac information when the reception state is the predetermined reception state, the ephemeris information including at least six orbital elements and being obtained from satellite information of first and second satellites among satellite information of three satellites, and the almanac information including at least six orbital elements on a general orbit of a third satellite of the three satellites.

The first reception operation is started in response to an acquisition request. Power supply to a RF unit and a demodulator is stopped after synchronization with the GPS signal is established. Based on information acquired from a sub-frame in the GPS signal, a time point to start the second reception operation is determined. Elapsed time is counted using a counter clock synchronized with transmission timing of the navigation message, while a reception frequency of the satellite, a PRN code unique to the satellite, and a frequency and a phase of the PRN code are retained. When the elapsed time arrives at the time point, the power supply to the RF unit and the demodulator is restarted.

GPS receiver apparatus and information acquisition method thereof

A wireless communication system. The system includes a wireless communication terminal, a base station to which the wireless communication terminal wirelessly connects at a time of starting communication with the specific communication party, another base station to which the wireless communication terminal newly connects after starting communication with the specific communication party and a transfer unit which transfers information transmitted from the specific communication party to the another base station.

Wireless communication system

A control data transmission and reception period of, for example, 1 ms is provided for each frame of a digital broadcast signal. The digital broadcast signal is intermittently transmitted. In the intermittent transmission, the transmitting device stops the digital broadcast signal from being sent during the control data transmission and reception period. At the same time, control data is transmitted during the control data transmission and reception period. In other words, a beacon signal is sent from a transmitting device to a wireless television receiver as control data, between the intermittent transmissions of the digital broadcast signal. Having received the beacon signal, the wireless television receiver returns a request signal to the transmitting device. As a result, communication between the transmitting device and the wireless television receiver can be established.

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Kawasaki, Japan

Toshio Hanabusa