摘要:
A communication system for transmitting and receiving a send data item is disclosed that comprises a transmitting device and a receiving device. The transmitting device includes a data generating unit to generate a data item by modulating the send data item, an impulse generating unit to generate an impulse corresponding to the generated data item, a transmitting channel selecting unit to allow a frequency component corresponding to a transmitting channel to pass through while the impulse attempts to pass therethrough, and a transmitting unit to transmit the impulse as a signal. The receiving device includes a receiving unit to receive the signal, a receiving channel selecting unit to allow the frequency component corresponding to the transmitting channel to pass through while the signal attempts to pass therethrough, and a data restoring unit to extract the impulse from the signal to restore the send data item according to the extracted impulse.
摘要:
A disclosed antenna device includes a plate-like ground plate, and a feeding unit that extends from the ground plate for a predetermined length at a predetermined angle. The feeding unit is constituted by a half-body, which is a body, such as a circular cone, halved by a plane perpendicular to the ground plate, and the feeding unit is prepared perpendicular to the ground plate.
摘要:
An impulse communication apparatus includes an impulse train generating part generating an impulse train from one modulated pulse by on-off keying, and an impulse train sending part sending the impulse train generated by the impulse train generating part.
摘要:
Burst-like data are alternately recorded on a disk over one round of tracks in directions of inner and outer circumferences with a track center of a desired track as a border. The burst-like data are arranged in such a manner that each data length of burst-like data is made shorter than a distance between a read.write gap of a magnetic head for reproducing the data and an erase gap, and that the distance among data of the burst-like data is made longer than a distance between the read.write gap and the erase gap. An apparatus for measuring the off-track of the magnetic head using the disk includes AC-DC converter to which reproducing signals of the magnetic head are supplied, reproduced DC signals being obtained from the AC-DC converter, A/D converter for converting the DC signals to obtain digital data, a timing generator for detecting the burst-like data and generating timing signals of data collection, an amplitude ratio calculation circuit for performing discrimination of the burst-like data provided at an inner or outer circumference side of the track and for detecting an amplitude ratio, and an amplitude ratio vs off-track quantity conversion circuit for converting the amplitude ratio to the off-track quantity of the magnetic head.
摘要:
The present invention is an apparatus for detecting the breaking of a glass plate. The invention uses a piezoelectric element, a signal separating circuit and a gate circuit. The piezoelectric element converts the vibrations of the glass plate into an electrical signal. The signal separation circuit separates the electrical signal into two signal signal components. The first signal component has a frequency range of less than 50 kHz. The second signal component has a frequency component higher than 100 kHz. The gate circuit produces an output signal only when both of the signal components have a signal level higher than their respective predetermined levels. By simultaneous detection of both of the first and second signal components, erroneous indication of the breaking of a glass plate can be prevented.
摘要:
An antenna device includes a ground element configured to be grounded, a first antenna to be connected to a radio communication module, and a second antenna configured to be parasitic on the first antenna, the second antenna receiving no power feed.
摘要:
A disclosed memory card having a built-in antenna and being connected to an electronic apparatus includes a circuit board configured to be covered by a case, an antenna element formed on one surface of the circuit board or on one surface of a board mounted on the circuit board, and a ground element formed on another surface of the circuit board or on another surface of the board mounted on the circuit board, wherein a part or all of the antenna element and a part or all of the ground element are formed to protrude outside the electronic apparatus when the memory card is connected to the electronic apparatus.
摘要:
An antenna device includes a T-shaped element having a first end part, a second end part, and a third end part, the first end part being a feeding point, the T-shaped element being bifurcated at an intermediate point; and a stub having one end connected between the intermediate point and the second end point and another end connected to ground, the stub forming a π-shaped configuration with the T-shaped element; wherein a length of a first line between the first end part and the second end part is longer than a length of a second line between the first end part and the third end part; and the length of the first line and the length of the second line correspond to a first resonance frequency and a second resonance frequency.
摘要:
A product management system is disclosed. The product management system comprises a product detection device disposed on a product display rack and configured to detect presence/absence of a product on the product display rack, a wireless communication device disposed on the product display rack and configured to wirelessly transmit information about the presence/absence of the product detected by the product detection device, a relay device to relay communications between the wireless communication device and a network, a product management device to store and display the information transmitted from the wireless communication device via the relay device and the network, and a terminal device capable of wireless communications with the wireless communication device and configured to travel with a shopper.
摘要:
A communication device is disclosed that includes an antenna apparatus including a feeding portion, a looped antenna element connected to the feeding portion, and a resistor inserted into the looped antenna element, and a communication circuit configured to process data that is transmitted and received via the antenna apparatus.