| ICOM INCORPORATED Patent applications |
| Patent application number | Title | Published |
|---|
| 20120093264 | TONE SIGNAL CIRCUIT AND WIRELESS RECEIVER - In a tone signal circuit and a wireless receiver of the present invention, a digital signal in a frequency band including at least a tone signal component is input into a Goertzel filter. Further, an envelope of an output from the Goertzel filter is detected, and a derivative value of the envelope is derived. Then, if the derivative value is maintained to be equal to or greater than a first threshold value, it is determined that a first prerequisite for existence of the tone signal component is satisfied. The above tone signal circuit and the wireless receiver can perform highly-accurate tone detection in a small calculation amount. | 04-19-2012 |
| 20120043916 | PORTABLE ELECTRONIC DEVICE - A drop detection part that detects drop into the water, a light emission part, and a light-emission control circuit that makes the light emission part emit light when the drop detection part detects the drop into the water. Also, the light emission part may be disposed on the side to be turned up by buoyancy when the device is dropped into the water and the drop detection part may be disposed on the side to be turned down in the case of the drop into the water, for example. | 02-23-2012 |
| 20120001686 | HIGH FREQUENCY CIRCUIT - A high frequency circuit includes an amplifier part that includes a plurality of amplifier circuits amplifying a high frequency signal and connected in parallel, that synthesizes outputs of the amplifier circuit and that supplies the outputs to an antenna; a controller that outputs a low power signal during a low power mode in which the amplifier part operates at low power; and an operation suppressing circuit that disables one of the plurality of amplifier circuits based on the low power signal. | 01-05-2012 |
| 20110306290 | WIRELESS TERMINAL DEVICE, WIRELESS COMMUNICATION METHOD, AND WIRELESS COMMUNICATION SYSTEM AND PROGRAM - A wireless terminal device (TA) receives a downlink signal that is repeatedly transmitted from a pre registered home repeater when requesting communication, specifies an idle channel based on idle channel information that is included in the downlink signal, and using the frequency of the uplink signal of the idle channel requests communication permission from the relay device that provides the idle channel. When communication permission cannot be received from the relay device from which communication permission was previously requested, the wireless terminal device (TA) uses the same frequency as the frequency of the downlink signal from the home repeater to transmit a signal to the wireless terminal device (TB) of an intended other party requesting communication. | 12-15-2011 |
| 20110204921 | LEVEL CONVERSION CIRCUIT - Circuit blocks and respectively convert high-voltage logic signals in which two logical values are expressed by a first signal potential and a second signal potential into low-voltage logic signals in which the two logical values are expressed by a third signal potential at least as large as the first signal potential and a fourth signal potential that is the third signal potential to which a positive voltage has been added and which is no greater than the second signal potential, and outputs the converted logic signals. The transistors in the circuit block are of the form of replacing the respective transistors of the circuit block with elements of opposite polarity, so that when the third signal potential is changed and operation of one of the circuit blocks and becomes difficult, the other operates normally. Consequently, stable level conversion can be accomplished. | 08-25-2011 |
| 20110199960 | WIRELESS COMMUNICATION SYSTEM, RELAY SYSTEM, REPEATER DEVICES AND SYNCHRONIZATION METHOD - A wireless communication system comprises a relay system including a plurality of relay devices and a plurality of wireless terminal devices. Each relay device transmits control information to the wireless terminal device which is registered in the own relay device, and each wireless terminal device selects, based on the control information received from the relay device which registers the own wireless terminal device, a channel which is currently able to relay a communication among channels respectively allocated to the relay devices to establish a communication between the wireless terminal devices. Each relay device acquires information configuring the control information via a communication line and causes a downlink signal wirelessly transmitted by the own relay device to synchronize with a communication signal, and each wireless terminal device maintains, when shifting a channel for communication to another channel, a synchronized state established in a channel prior to shifting. | 08-18-2011 |
| 20110199959 | WIRELESS COMMUNICATION SYSTEM, WIRELESS COMMUNICATION METHOD THEREOF, REPEATER DEVICES AND WIRELESS TERMINAL DEVICES - Plural repeaters ( | 08-18-2011 |
| 20110199958 | RELAY SYSTEM, RELAY DEVICE AND SYNCHRONIZATION METHOD - When no synchronization signal is transmitted over a system bus ( | 08-18-2011 |
| 20110194486 | RELAY DEVICE, WIRELESS COMMUNICATION METHOD, AND WIRELESS COMMUNICATION SYSTEM - A frequency band of 12.5 kHz that two repeaters ( | 08-11-2011 |
| 20110189946 | WIRELESS COMMUNICATION SYSTEM, WIRELESS COMMUNICATION METHOD, WIRELESS COMMUNICATION TERMINAL DEVICE, RELAY DEVICE, AND RELAY SYSTEM - Wireless terminal devices (TA) to (TH) each detects whether channel information received from each of repeaters ( | 08-04-2011 |
| 20110189945 | WIRELESS COMMUNICATION SYSTEM, WIRELESS COMMUNICATION METHOD, RELAY DEVICE, AND WIRELESS TERMINAL DEVICE - There is provided a wireless communication system which causes a wireless terminal to select a relay device among plural relay devices connected together via a communication line when the wireless terminal attempts to communicate with another wireless terminal. The relay device has an information acquiring unit, a calling determining unit, and an information adding unit. The wireless terminal has an information analyzing unit which analyzes whether or not the own device is included in a communication counterparty of calling information when the calling information is included in communication information, a priority comparing unit which determines whether or not a priority level of the calling information is higher than that of a current communication when the own device is included, and a channel changing unit which changes a channel to that of another relay device of the calling information when the priority level of the calling information is higher. | 08-04-2011 |
| 20110110465 | FSK RECEIVER - In an FSK receiver according to the present invention, a correction operation for a DC offset component is performed based on a maximum value and a minimum value of a demodulation signal. If a difference between the maximum and minimum values is less than a predetermined threshold value TH | 05-12-2011 |
| 20110051855 | FRAME SYNC DETECTING CIRCUIT AND FSK RECEIVER USING THE SAME - A frame sync detecting circuit and FSK receiver sequentially derive a moving average value (□) from oversample values of a received word pattern, for given symbol periods, and a difference between the moving average value and an average value for the given symbol periods in a given sync word pattern is determined as DC offsets Δf. Subsequently, the DC offset Δf is subtracted from the received word pattern, and correlation processing with respect to the sync word pattern is performed to determine a correlation value (). If the correlation value exceeds a predetermined threshold, it is determined that a sync word candidate has been received, and symbol values of the received word pattern after the DC offset correction are compared with respective symbol values of the sync word pattern. A sync word pattern detection is determined if errors in the symbols are within a given range. | 03-03-2011 |
| 20110050302 | CHARGE PUMP CIRCUIT AND PLL CIRCUIT USING THE SAME - A charge pump circuit ( | 03-03-2011 |
| 20110019788 | CLOCK REGENERATION CIRCUIT AND RECEIVER USING THE SAME - Provided are a clock regeneration circuit and a receiver, wherein difference values (V | 01-27-2011 |
| 20100253438 | Phase Locked Loop Circuit - A PLL circuit comprises a phase detector, a charge pump, a loop filter, a voltage-controlled oscillator (VCO), and two variable voltage sources. The phase detector and the charge pump each comprises low-voltage transistors, and operates with a fixed supply voltage VCC1 (e.g., 5 V) which is a potential difference applied from the variable voltage source of a power-supply voltage VL and the variable voltage source of a power-supply voltage VDC (=VL+VCC1). A tuning control signal VC generated by integrating an output current signal of the charge pump using the loop filter is input to the VCO having an input voltage range of the tuning control signal from 0 V to VCC2 (e.g., 16 V). At this time, the output voltage range of the tuning control signal is from VL to VDC, but the output voltage range is expanded to cover the full input voltage range from 0 V to VCC2 by controlling the output voltages VL, VDC of the variable voltage sources, thereby allowing the VCO to output an output signal with a desired oscillation frequency. | 10-07-2010 |
| 20100208647 | COMMUNICATION APPARATUS AND COMMUNICATION CONTROL PROGRAM - A communication apparatus includes an input unit that inputs names of repeater stations to which the local communication apparatus and a communication counterpart belong respectively, a memory storing identification information of each repeater station, and information needed to set a communication path from the repeater station to another repeater station as communication path setting information associated with the name of the repeater station, an information retrieving section that retrieves identification information of the repeater station, and information needed to set a communication path to another repeater station from the associated information stored in the memory based on the input name of the repeater station, and a communication frame generating section that generates a communication frame including the identification information of the repeater station, and the information needed to set the communication path from the repeater station to which the local communication apparatus belongs to the repeater station of the communication counterpart from a result of the information retrieval. | 08-19-2010 |
| 20100124168 | REPEATER MONITOR SYSTEM AND REPEATER MONITOR METHOD - A monitor terminal transmits a monitor request command to monitor a repeater station designated by an operator to a monitor server via the Internet. The monitor server detects a monitor station located in the communication range of the designated repeater station from the content of the received monitor request command, and transmits a monitor instruction command to the detected monitor station via the Internet. The monitor station intercepts a radio signal during transmission from the repeater station to a radio communication device or vice versa. Upon reception of the monitor instruction command, the monitor station transmits the intercepted radio signal as monitor data to the monitor server. The monitor server transfers the monitor data to the monitor terminal. Upon reception of the monitor data transferred from the monitor server, the monitor terminal radio-transmits the received monitor data using a radio wave format receivable by the radio communication device. | 05-20-2010 |
| 20100098283 | MICROPHONE - A microphone which does not need a hanger plate structure is provided. A conductive hanger knob is provided at the back of the rear case of a microphone case. The hanger knob has three layers of a conductive shaft part, an insulator part and a conductive bolt part in the named order from its center. The shaft part is electrically insulated from the bolt part. A notch that locks the bolt part of the hanger knob at a hanger surface is formed at a conductive hanger hook on which the microphone is hooked via the hanger knob. A support spring portion disposed at the back of the hanger surface urges the shaft part of the hanger knob locked at the notch in a direction of pushing the shaft part back toward the hanger surface. This provides electric conduction between the shaft part and the bolt part via the hanger hook. | 04-22-2010 |
| 20100054174 | DATA COMMUNICATION CONTROL APPARATUS, DATA COMMUNICATION SYSTEM, DATA COMMUNICATION METHOD, AND COMPUTER-READABLE STORAGE MEDIUM RECORDING DATA COMMUNICATION PROGRAM - A user location monitoring unit of a data communication control apparatus monitors a message sent from a wireless device via a repeater. Upon detection of a change in the location of the wireless device, the user location monitoring unit updates the location information in the database and notifies via the Internet a management server of the location change. Upon receipt of the message via the Internet, a destination address confirming and correcting unit of the data communication control apparatus uses the user ID of a destination wireless device as a search keyword to search the database. In turn, the destination address confirming and correcting unit corrects the destination address of the message to the latest address of the pertinent user ID and outputs the corrected message to a received message forwarding unit. | 03-04-2010 |
| 20100052784 | LOW NOISE AMPLIFIER - A low noise amplifier having a wide operating frequency band and a high dynamic range is provided. A transformer having a secondary winding connected between an input terminal to which an input signal is applied and a positive differential output terminal, and a primary winding connected between a negative differential output terminal and an input node is provided as a feedback circuit between a cascode amplifier circuit, which includes transistors and a resistor, and an output circuit, which includes a transistor and a constant current source. Selective use of a transformer whose leakage inductance has an adequate value as the feedback transformer can realize a low noise amplifier which has a wide operating frequency band and a high dynamic range. | 03-04-2010 |
| 20090298452 | METHOD FOR SCANNING FREQUENCY, RECEIVER, AND COMPUTER-READABLE RECORDING MEDIUM - A receiver according to the present invention has a reception unit which receives reception signals; a storage unit which stores a band table, in which a plurality of frequency bands serving as scanning targets are registered so that the frequency bands correspond to band identifiers, respectively, and a link table, in which any number of the band identifiers registered in the band table are registered so that the band identifiers correspond to a link identifier; a control unit which, when the link identifier is specified, refers to the band table and the link table, obtains the frequency bands corresponding to the link identifier, carries out scanning within the frequency band for each of the frequency bands, and sequentially sets reception frequencies of the reception signals; and a frequency synthesizer. | 12-03-2009 |
| 20090268659 | REPEATER, WIRELESS COMMUNICATION SYSTEM, CONTROL METHOD AND RECORDING MEDIUM - The present invention provides a repeater that can transmit the same signal received by plural repeaters to the recipient wireless communication device without redundancy of the signal, a wireless communication system, a control method, and a recording medium. | 10-29-2009 |
| 20090262924 | TONE SIGNAL DETECTOR, TONE SIGNAL DETECTION METHOD, AND COMPUTER READABLE RECORDING MEDIUM - Upon selection of the frequency of a tone signal, a local oscillator generates a frequency signal having a shift frequency corresponding to the frequency of this tone signal. A frequency shifter generates a frequency-converted signal by shifting a frequency of the tone signal by a shift frequency of the frequency signal generated by the local oscillator. A BPF removes an image signal from the frequency-converted signal which the frequency shifter generated, and a normalizer normalizes the amplitude of the signal output from the second BPF. By this, even if the amplitude of the tone signal is small, the amplitude thereof is unified to a suitable magnitude. For this reason, even if there is a difference in the amplitude of the tone signal, the tone signal can be detected reliably and an false detection can be prevented. | 10-22-2009 |
| 20090220117 | MICROPHONE AND MICROPHONE HANGER-HOOK - A conductive hanger plate having a flat external face and a conductive hanger knob are so provided as to be electrically isolated with each other at the same side of the external face of a non-conductive rear casing of a microphone casing. A conductive hanger hook hanging the microphone casing via the hanger knob is provided with a notch for catching the hanger knob. The hanger hook has a first elastic member which pushes the caught hanger knob in a direction toward a hanger face, and second elastic members which urges the hanger plate in a direction apart from the hanger face. | 09-03-2009 |
| 20090195312 | DIFFERENTIAL AMPLIFIER - A differential amplifier comprises a left amplifier having transistors, a right amplifier having transistors, a negative feedback network having a resistor, and a negative feedback network having a transformer with a center tap. Phase compensation networks comprising a capacitor and a resistor, a capacitor and a resistor, and a capacitor and a resistor are further added to the amplifier. Both ends of a secondary winding of the transformer are connected to the output terminals of the right and left amplifiers, and the center tap of the secondary winding is grounded, so that a differential amplified output signal can be fed back to a single-phase input using one transformer, thereby reducing a cost and an area. | 08-06-2009 |
| 20090111396 | AM TRANSMITTER AND MODULATION METHOD USING SAME - An AM (Amplitude-Modulated) transmitter capable of improving modulation distortion is provided. An adder adds a modulation signal to a pre-set power reference signal. An APC (Automatic Power Control) amplifier compares a level of a detecting signal outputted by the LPF (Low Pass Filter) with a level of an adder signal. The APC amplifier, based on the comparison result, generates a gain controlling signal that makes a difference between a level of the detecting signal and level of the signal approach zero and feeds the gain controlling signal to a power amplifier. The power amplifier modulates the signal outputted from the amplifier by the gain controlling signal and power-amplifies the modulated signal according to a level of the gain controlling signal. Since the APC amplifier feeds the gain controlling signal to the power amplifier, a modulation degree does not depend on a nonlinear distortion characteristic of the power amplifier. | 04-30-2009 |
| 20090108937 | LOW NOISE AMPLIFIER AND DIFFERENTIAL AMPLIFIER - In a double-loop negative feedback low noise amplifier having double negative feedback paths by a feedback transformer and a feedback resistor added to a cascode amplifier comprising transistors and a resistor, a phase compensation circuit comprising a capacitor and a resistor is added between the output terminal of the double-loop negative feedback low noise amplifier and the input terminal of the cascode amplifier, i.e., the input terminal of the input transistor, and a phase compensation circuit comprising a capacitor and a resistor is added to the upper-stage transistor of the cascode amplifier, i.e., the input terminal of the upper-stage transistor. Those phase compensation circuits enable a low noise negative feedback amplifier which maintains a high feedback loop gain to a high frequency band, has a wider bandwidth than a conventional one, and has a high dynamic range. | 04-30-2009 |
