Abstract: Multiplexer (100) according to the present invention includes: an input unit (11) to which a plurality of image signals based on a first data communication standard are input, the image signals being acquired by respective imaging devices (2); an output unit (14) that outputs an image signal based on a second data communication standard having a data transfer rate lower than that of the first data communication standard; and a storage unit (12) that temporarily buffers the image signals input from the input unit (11). With such a multiplexer 100, it is possible to collectively convert the image data acquired by a plurality of imaging devices adopting a certain data communication standard into another data communication standard and suppress the data transfer delay caused by the conversion.

Abstract: A first communication unit 11 repeatedly transmits the same data signal as a transmitted data signal to a second communication unit 23 at shorter time intervals than an acknowledgement time in which an ACK signal is returned from the second communication unit 23 without any failure. As a result, even when the transmitted data signal is garbled in the middle of a transmission path due to noise, the second communication unit 23 can rapidly receive the repeatedly transmitted same data signal.

Abstract: A first communication unit 11 repeatedly transmits the same data signal as a transmitted data signal to a second communication unit 23 at shorter time intervals than an acknowledgement time in which an ACK signal is returned from the second communication unit 23 without any failure. As a result, even when the transmitted data signal is garbled in the middle of a transmission path due to noise, the second communication unit 23 can rapidly receive the repeatedly transmitted same data signal.

Abstract: [Problem] To enable imaging to be performed with appropriate timing. [Solution] In a camera manipulation device 1 according to the present invention, a trigger signal T12 is issued and imaging is begun when a prescribed command is transmitted from a control circuit side to an imaging unit side (see S12). Because the issuance of such trigger signal T12 is not accepted before a character reception start command is issued, it is possible to perform imaging with appropriate timing.

Abstract: [Problem] To enable imaging to be performed with appropriate timing. [Solution] In a camera manipulation device 1 according to the present invention, a trigger signal T12 is issued and imaging is begun when a prescribed command is transmitted from a control circuit side to an imaging unit side (see S12). Because the issuance of such trigger signal T12 is not accepted before a character reception start command is issued, it is possible to perform imaging with appropriate timing.

Abstract: [Problem] To make a device compact and inexpensive by omitting a frame buffer. [Solution] First packet data PD1 that is sequentially received from a first camera C1 and second packet data PD2 that is sequentially received from a second camera C2 are alternately and sequentially transmitted to an external device 2 before data for one screen is accumulated. Therefore, a frame buffer for saving the data for one screen is not necessary, and a device can be made correspondingly more compact and less expensive.

Abstract: [Problem] To make a device compact and inexpensive by omitting a frame buffer. [Solution] First packet data PD1 that is sequentially received from a first camera C1 and second packet data PD2 that is sequentially received from a second camera C2 are alternately and sequentially transmitted to an external device 2 before data for one screen is accumulated. Therefore, a frame buffer for saving the data for one screen is not necessary, and a device can be made correspondingly more compact and less expensive.

Abstract: [Problem] To prevent either of two packet data having the same content from being affected by noise [Solution] A packet data transmission device (not shown) transmits first packet data 1A, . . . and second packet data 1B, . . . having the same content intermittently with an idle time I therebetween. When the length of the first and second packet data 1A, . . . , 1B, . . . is denoted by LP, the length of the idle time I is denoted by LI, the duration of low-frequency noise N is denoted by LN, the time with no low-frequency noise from the occurrence of one low-frequency noise N to the occurrence of the next low-frequency noise N is denoted by LC, the following expressions (1), (2) are satisfied. Consequently, either the first packet data or the second packet data is transmitted to a receiver without being affected by noise.

Abstract: [Problem] To prevent either of two packet data having the same content from being affected by noise [Solution] A packet data transmission device (not shown) transmits first packet data 1A, . . . and second packet data 1B, . . . having the same content intermittently with an idle time I therebetween. When the length of the first and second packet data 1A, . . . , 1B, . . . is denoted by LP, the length of the idle time I is denoted by LI, the duration of low-frequency noise N is denoted by LN, the time with no low-frequency noise from the occurrence of one low-frequency noise N to the occurrence of the next low-frequency noise N is denoted by LC, the following expressions (1), (2) are satisfied. Consequently, either the first packet data or the second packet data is transmitted to a receiver without being affected by noise.