Yamaha Corporation

Hirokazu Suzuki

Toshiyuki Sugawara

Kazushi Tamai

Tomohiro Shinkawa

Shuntaro Suzuki

Shun Iwamoto

Tadahiko Moriya

A communication relay device includes a plurality of wireless communication modules; a processor; and a memory configured to store a program, the program being executable by the processor to cause the processor to: acquire a designated bandwidth and internal information of the communication relay device; and set a number of wireless communication modules among the plurality of wireless communication modules to be used for communication by the communication relay device based on the designated bandwidth and the internal information of the communication relay device.

Communication relay device, communication control method, and non-transitory computer readable storage medium

A wireless transmitting device includes a receiving circuit configured to receive a reception frame from another device, and a transmitting circuit configured to transmit a broadcast transmission frame while the receiving circuit is not receiving the reception frame, and controls the transmitting circuit to delay transmission of the broadcast transmission frame for a waiting period that starts from an end of reception of the reception frame according to a frame type of the transmission frame, including a broadcast frame, a unicast frame, and a reception acknowledgement response frame, wherein the waiting period for the broadcast frame is shorter than the waiting period for the unicast frame and longer than the waiting period for the reception acknowledgement response frame.

Wireless transmitting device and wireless transmitting method

A wireless transmitting system acquires transmission data, sequentially transmits, by broadcast, a plurality of frames contained in the acquired transmission data, that are modulated by any of a plurality of modulation and coding schemes (MCSs) including a first MCS and a second MCS, and controls to transmit a first frame that is modulated by the first MCS based on the acquired transmission data and then to transmit a second frame that is modulated by the second MCS based on the acquired transmission data.

Wireless transmitting device, wireless receiving device, and wireless transmitting method

A signal transmission device includes a first antenna, a second antenna, a demodulation device, and a fixing member. The first antenna transmits radio waves containing a signal modulated at a first frequency. The second antenna receives the radio waves containing the signal via a medium. The demodulation device demodulates the signal and connected to the second antenna. The fixing member fixes the first antenna and the second antenna to the medium.

Signal transmission device

A wireless communication method includes receiving a broadcast signal from a wireless terminal, comparing a receiving intensity of the received broadcast signal with a set value, and transmitting to the wireless terminal a first signal indicating that the wireless terminal can start connection depending on a result of the comparison.

Wireless communication method and system including wireless relay devices that determine information about presence and absence of a response signal from a wireless terminal

A communication device includes a first module, a communication portion communicating with a second module, a memory, and a processor that executes instructions stored in the memory. The instructions cause the processor to perform: executing a processing of changing a first radio communication to a non-restrictive state when a first signal is received from the second module in a state that the first radio communication is in a restrictive state; and executing a first processing of transmitting a second signal for changing a second radio communication to the non-restrictive state to the second module and a second processing of changing the first radio communication to the restrictive state when the priority signal using the first channel is detected in a state that the first radio communication is in the non-restrictive state.

Communication system, communication device, control device and communication control method

A control device includes a memory that stores instructions and a processor that executes the instructions. The instructions cause the processor to perform: controlling, based on a first number of communication terminals to which a first module performs radio communication and a second number of communication terminals to which a second module performs radio communication, whether to permit the communication terminal having made a request for connection to the first module to connect to the first module or not.

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Hamamatsu, Japan

Hirokazu Suzuki