Abstract: An active vibration noise control device obtains error signals corresponding to a cancellation error between vibration noise and control sounds generated by multiple speakers, from microphone(s), and actively controls the vibration noise. A basic signal generating unit generates a basic signal based on a vibration noise frequency. An adaptive notch filter unit generates control signals provided to each of the multiple speakers by applying a filter coefficient to the basic signal. A reference signal generating unit generates a reference signal from the basic signal based on multiple transfer characteristics from the multiple speakers to the one or more microphones. A filter coefficient updating unit updates the filter coefficient used by the adaptive notch filter unit so as to minimize the error signals. A controlling unit changes amplitude of the control signals of the speakers based on a similarity between the transfer characteristics and characteristics of the vibration noise.

Abstract: An active vibration noise control device is preferably used for canceling a vibration noise by making a speaker generate a control sound. Concretely, the active vibration noise control device includes an attenuating unit which attenuates a control signal generated by an adaptive notch filter, and provides the attenuated control signal to the speaker, when amplitude of a filter coefficient is larger than a threshold. Therefore, it is possible to suppress continuous ups and downs of the filter coefficient during an occurrence of an abnormality. Hence, it becomes possible to appropriately suppress an occurrence of a cyclic abnormal sound and an increase in the vibration noise during the occurrence of the abnormality.

Abstract: An active vibration noise control device having a pair of speakers, including: a basic signal generating unit generating a basic signal based on a vibration noise frequency; an adaptive notch filter generating a first control signal provided to one speaker using a first filter coefficient and generating a second control signal provided to the other speaker using a second filter coefficient to cancel the generated vibration noise; a microphone detecting cancellation error between the vibration noise and the control sounds and outputting an error signal; a reference signal generating unit generating a reference signal based on a transfer function from the speakers to the microphone; a filter coefficient updating unit updating first and second filter coefficients, minimize the error signal; and a phase difference limiting unit limiting a phase difference between control sounds generated by different speakers. Therefore, it becomes possible to appropriately ensure a uniform and wide noise-cancelled area.

Abstract: An active vibration noise control device obtains error signals corresponding to a cancellation error between vibration noise and control sounds generated by multiple speakers, from microphone(s), and actively controls the vibration noise. A basic signal generating unit generates a basic signal based on a vibration noise frequency. An adaptive notch filter unit generates control signals provided to each of the multiple speakers by applying a filter coefficient to the basic signal. A reference signal generating unit generates a reference signal from the basic signal based on multiple transfer characteristics from the multiple speakers to the one or more microphones. A filter coefficient updating unit updates the filter coefficient used by the adaptive notch filter unit so as to minimize the error signals. A controlling unit changes amplitude of the control signals of the speakers based on a similarity between the transfer characteristics and characteristics of the vibration noise.

Abstract: An active vibration noise control device is preferably used for canceling a vibration noise by making a speaker generate a control sound. Concretely, the active vibration noise control device includes an attenuating unit which attenuates a control signal generated by an adaptive notch filter, and provides the attenuated control signal to the speaker, when amplitude of a filter coefficient is larger than a threshold. Therefore, it is possible to suppress continuous ups and downs of the filter coefficient during an occurrence of an abnormality. Hence, it becomes possible to appropriately suppress an occurrence of a cyclic abnormal sound and an increase in the vibration noise during the occurrence of the abnormality.

Abstract: An active vibration noise control device is preferably used for cancelling a vibration noise by making a speaker generate a control sound. The active vibration noise control device includes a step-size parameter changing unit which changes a step-size parameter used for updating a filter coefficient. The step-size parameter changing unit calculates a parameter-for-change based on the filter coefficient updated by using a basic step-size parameter, and changes the basic step-size parameter by a minimum value in the previously calculated parameter-for-change. Therefore, it is possible to appropriately change the step-size parameter by using the minimum value of the parameter-for-change. Hence, it becomes possible to effectively suppress a divergence of an adaptive notch filter due to a secular change of the speaker.

Abstract: A two-dimensional code pattern includes: a boundary pattern in which each of pixels in a group are set into a turn-on state or a turn-off state; a rotation detection pattern in which each pixel belonging to a group in each block is set into the turn-on state or the turn-off state by a light emitting pattern which can detect a rotational angle upon reading of the block; and an information pattern in which both of each pixel belonging to a first quadrant region in the block and each pixel belonging to a third quadrant region are set into the turn-on state or the turn-off state according to first information data and both of each pixel belonging to a second quadrant region and each pixel belonging to a fourth quadrant region are set into the turn-on state or the turn-off state according to second information data.

Abstract: An active vibration noise control device having a pair of speakers, including: a basic signal generating unit generating a basic signal based on a vibration noise frequency; an adaptive notch filter generating a first control signal provided to one speaker using a first filter coefficient and generating a second control signal provided to the other speaker using a second filter coefficient to cancel the generated vibration noise; a microphone detecting cancellation error between the vibration noise and the control sounds and outputting an error signal; a reference signal generating unit generating a reference signal based on a transfer function from the speakers to the microphone; a filter coefficient updating unit updating first and second filter coefficients, minimize the error signal; and a phase difference limiting unit limiting a phase difference between control sounds generated by different speakers. Therefore, it becomes possible to appropriately ensure a uniform and wide noise-cancelled area.

Abstract: It is an object to provide a reading apparatus of an information code, a reading method, and a display reading system of the information code, in which even if symbol areas serving as references when sampling a photograph image signal obtained by photographing a display screen are not provided in the information code, information code data representing the information code can be obtained from the photograph image signal. When reading the information code displayed on a display apparatus, first, an image signal obtained when all pixel cells of the display apparatus have emitted light is extracted as a first image signal from the photograph image signal obtained by photographing the display screen of the display apparatus. Further, an image signal obtained for a period of time during which the information code is displayed is extracted as a second image signal from the photograph image signal.

Abstract: An object of the present invention is to provide a method and device for reading an information code in which an information code displayed on a display can be read without increasing the circuit size of the display device. To read the information code displayed on the display in a predetermined area during each frame display interval, a synchronization signal synchronized with each of the frame display intervals is generated based on noise emitted from the display, and the information code is restored from a captured image signal obtained by capturing a screen of the display as an image in accordance with the synchronization signal.

Abstract: An input system (1) comprise: a display (11) for displaying an image including coordinate information on the display surface; a plurality of indicators (12) having (i) a detecting means for detecting the image displayed on the display surface, and (ii) a transmitting means for transmitting transmission information generated according to the coordinate information contained in the detected image; and a controller (13) having (i) a receiving means for receiving the transmission information, (ii) a generating means for generating drawing information indicating the path along which each of the indicators moves on the display surface according to the transmission information, and (iii) a control means for controlling the display so as to perform the drawing processing corresponding to the drawing information generated by the generating means. The display displays an image by emitting a plurality of pulses and displays the coordinate information by using part of the pulses.

Abstract: An object is to provide a display method and device for displaying an information code, in which an information code can be displayed on a display without affecting the image being displayed. A one subfield among N subfields is used as a subfield for displaying an information code as a two-dimensional code, and the other subfields are used as subfields for displaying a primary image, in a process in which intermediate brightness is displayed using the N subfields for each unit display interval.

Abstract: It is an object to provide a two-dimensional code pattern which can be precisely read out at a high speed, a two-dimensional code pattern display device, and its reading device.

Abstract: A signal transmitting and receiving device and a signal transmitting and receiving method which can reduce power consumption in a terminal device in a standby state in an optical and electric communication system. The signal transmitting and receiving device is for transmitting and receiving an information signal through a predetermined transfer path between terminal devices each of which transmits and receives the information signal while controlling an operation thereof in a self-sustaining manner based on an internally-generated signal. The signal transmitting and receiving device includes: a signal relaying part for relaying the information signal between each of the terminal devices and the transfer path; a device-state detecting part for generating a state indication signal indicating a state of the terminal device based on the internally-generated signal; and a power controlling part for controlling power supply to the signal relaying part based on the state indication signal.

Abstract: A data transmission terminal apparatus and a data transmission method for maintaining a data transmission between the terminals irrespective of the state of a clock signal associated with a transmission data packet. The data transmission terminal apparatus multiplexes an image data signal and an other data signal to generate a data packet synchronized to a reference clock signal included in the image data signal, and relays the generated data packet to a transmission path.

Abstract: A video signal transmission system, wherein on the transmission side, digital video signals representing three primary colors is time-division-multiplexed for conversion into a video data train, a packet including the video data train and rate information for each period based on the period of the transmission clock signal, and the packet is sequentially transmitted in synchronism with a transmission clock signal as a transmission signal, while on the reception side, a reception clock signal is generated in synchronism with each bit of the transmission signal received through a cable, the rate information is detected from the packet in the transmission signal, a reproduction reference clock signal is generated, the video data train in the transmission signal is separated into data of each of three primary colors, and the separated data of each of three primary colors is output in synchronism with the reproduction reference clock signal as the digital video signal.

Abstract: A video signal transmission method for time-division multiplexing digital video signals representing three primary colors to convert into serial video data, and transmitting the serial video data in blocks. The serial video data has 3×M×N bits per block, where M denotes the number of bits per pixel, and N denotes the number of pixels. A transmission side system clock signal, which has a frequency higher than the frequency of a reference clock signal of the digital video signals, is generated, and each of the bits in the block is transmitted in synchronism with the transmission side system clock signal.

Abstract: A video signal transmission system which includes a transmitter and a receiver. The transmitter converts digital video signals into serial video data by time division multiplexing; generates header data in a cycle of a divided clock signal produced by dividing a reference clock signal of the digital video signals; and provides a transmission signal in synchronization with a transmitter system clock signal, the transmission signal including a train of blocks each including the header data and a predetermined amount of the serial video data in that order.