Abstract: A display device comprises an inspection circuit for inspecting a data reception related circuit to generate inspection information, an inspection result image generation circuit for generating image data indicating the inspection information, a display switching circuit for superimposing inspection result image data on test video data, and a display unit for displaying the test video data superimposing the inspection result image data. As a result, it is possible to carry out inspection after assembly of the display device without disassembling the display device. This in turn makes it possible to carry out a test in a simple manner on the data reception related circuit inside the display device without changing noise environment inside the display device.

Abstract: Two or more synchronous words are arranged to a section as long as a noise cycle “t” regarding a frame. Or, one or more synchronous words are arranged such that a section not being influenced by the noises is long enough considering the noise cycle. When information that cyclical noises occur is given and/or the noise cycle can be measured, probability that the synchronous word is influenced by the noises is reduced so that reliability of frame synchronization establishment can be improved.

Abstract: In a transmitter, either the voltage or the current, or both applied to each of a pair of conductors is monitored. In a receiver either the voltage or the current, or both outputted from each conductor are monitored, thereafter the status will be outputted. Using the outputted status, either the voltage or the current, or both applied to the conductors in a transmitter will be controlled. This makes it possible to improve the degree of balance in the receiver while keeping the balance in the transmitter, which results in reducing EMC problems both in the transmitter and the receiver.

Abstract: Impedance values of a common mode choke coil, an impedance element disposed anterior to the common mode choke coil and an impedance element disposed posterior to the common mode choke coil are determined in such a manner that a common mode current flowing into the common mode choke coil does not exceed a value of rated current. Excessive common mode current is prevented from flowing into the common mode choke coil, and saturation and damage of the common mode choke coil is prevented.

Abstract: The status of communications by a specific metallic cable set among a number of metallic cables and that are arranged close to each other in a transmission line is inspected. An inspection signal is supplied to flow in one metallic cable, an interference signal flowing in another metallic cable is measured in response to the flow of this inspection signal, and based on the relationship between the inspection signal and the interference signal, it is judged whether or not the status of communications by the specific metallic cable set is fine. A measuring device measures components other than a descending carrier to be received by a transmitter-receiver from a repeater, and includes information on the components in an ascending carrier.

Abstract: A display device comprises an inspection circuit for inspecting a data reception related circuit to generate inspection information, an inspection result image generation circuit for generating image data indicating the inspection information, a display switching circuit for superimposing inspection result image data on test video data, and a display unit for displaying the test video data superimposing the inspection result image data. As a result, it is possible to carry out inspection after assembly of the display device without disassembling the display device. This in turn makes it possible to carry out a test in a simple manner on the data reception related circuit inside the display device without changing noise environment inside the display device.

Abstract: Two different delay units delay first and second signals of a differential signal, thereby generating two different delay signals, respectively. A delay control unit controls respective delay times in the two different delay units, thereby varying a delay time difference between the respective delay times in the two different delay units. An error-detecting unit detects an error in the differential signal for each change in delay time deference. A counting unit counts the number of errors per predetermined time. The delay control unit sets the respective delay times in the two different delay unit to a delay time difference in which the number of times of errors per predetermined time is minimized. As a result, the occurrence of differential signal skew-caused errors is suppressed to an extreme extent.

Abstract: Impedance values of a common mode choke coil, an impedance element disposed anterior to the common mode choke coil and an impedance element disposed posterior to the common mode choke coil are determined in such a manner that a common mode current flowing into the common mode choke coil does not exceed a value of rated current. Excessive common mode current is prevented from flowing into the common mode choke coil, and saturation and damage of the common mode choke coil is prevented.

Abstract: Each band-pass unit of a second transmitting/receiving apparatus includes a band-pass means and a receiving quality detection means. The respective band-pass means have different passbands. The receiving quality detection means detects receiving quality information of a signal that has passed through the band-pass means. A receiving quality control means generates a receiving quality control signal based on the receiving quality information. The receiving quality control signal is a signal which becomes a basis for controlling the electric energy level of a signal transmitted by a first transmitting/receiving apparatus. The first transmitting/receiving apparatus adjusts the level of the signal transmitted in each passband.