Abstract: An implementation provides a transmitter that separates sequential portions of data in a first set of data by time intervals allowing a power saving mode (1005). The transmitter transmits the sequential portions of data separated by respective time intervals having lengths configured to allow a receiver to enter and exit a power saving mode between receiving sequentially transmitted portions of data from the first set of data (1010). The transmitter separates sequential portions of data in a second set by time intervals that are not of sufficient length to allow a receiver to enter and exit a power saving mode during the time intervals (1015). The second set of data is then transmitted (1020).

Abstract: This invention discloses an automatically signal-tuning system for using in video signal transmission. The system can use the auto-tuning function in video transmission circuit to make the system automatically detect the extents of frequency loss and delay affected by a transmitting cable and to adjust the received signal to approximate to the original transmitted signal once system reboot and/or transmitting cable hot-plugging. The compensation for the signal frequency loss and the signal delay is by comparing and analyzing the attenuation and the delay values to provide the video signal on the transmitting cable to be automatically adjusted to the optimized response value.

Abstract: A digital broadcasting transmission and/or reception system having an improved reception performance and a signal-processing method thereof. A digital broadcasting transmitter comprises a TRS encoder for to TRS-encode a MPEG-2 transmission stream having null data for inserting a Known data and a TRS parity at predetermined positions, randomizer to input and randomize data stream from the TRS encoder, a null packet exchanger to replace the null data for inserting the Known data to the known data, and an encoder for encoding a data streams to which the Known data is inserted. Accordingly, the present invention detects the known data from a signal received from a reception side and uses the detected known data for synchronization and equalization and further uses the TRS parity for correcting error of the received signal, so that the digital broadcasting reception performance can be improved at poor multipath channels.

Abstract: According to one embodiment, a transmission apparatus includes a transmission module, a controller, a signal transmission module, and a selection module. The transmission module is configured to output a video signal or an audio signal to a TMDS line of an HDMI cable in a form based on the HDMI standard. The controller is configured to input/output an HEAC signal of the HDMI standard. The signal transmission module is configured to perform signal transmission based on a method other than the HDMI standard. The selection module is configured to selectively switch the HEAC line of the HDMI cable to either a state used for transmission of the HEAC signal that is input/output to/from the controller or a state used for transmission of a signal that is input/output to/from the signal transmission module.

Abstract: The invention relates to a wireless home gateway apparatus and methods of wirelessly delivering audio and/or video programs between a home gateway and a client device and to interference mitigation techniques on such system. Specifically, the invention relates to transmitting an audio video program on a first channel, receiving a control signal from a remote control indicating interference on said first channel, changing the transmission channel to a second channel, and transmitting data indicating said second channel to said remote control.

Abstract: Pixels extracted from each of an input video signal are thinned out in units of predetermined samples, and the thinned out samples are fetched in equal order frame by frame and mapped into active periods of first, second, third, and fourth sub-images conformable to the HD-SDI format. The mapped first, second, third, and fourth sub-images are each separated into a first-link transmission channel and a second-link transmission channel, and are thus mapped into eight channels. The mapped first, second, third, and fourth sub-images are converted in parallel. Parallel digital data items into which the sub-images are converted in parallel are then outputted.

Abstract: Disclosed is a method, circuit and system for facilitating transmission of video and/or audio content from a computing/communications device such as Personal Computer, Cellular Phone, Smart-Phone, Personal Digital Assistant (“PDA”), Laptop Computer, Tablet, E-Book reader and/or any variation thereof. Video/audio content stored on, generated or received by, or otherwise displayable upon a computing/communications device may be at least partially processed using computational resources (e.g. central processing unit (CPU), graphics processing unit (GPU), digital signal processor (DSP), application processor, etc.) utilized by another application of the device. The video/audio content may be transmitted using one or more communication resources (e.g. Wi-Fi) utilized by another application of the device.

Abstract: A communication module capable of reducing power consumption in an electronic unit is provided. A communication module includes: a communication section; and a control section determining handling of data received by the communication section from an external unit, based on one or both of a power state of a connected host unit and a type of the received data.

Abstract: Provided is a system for supplying a power from a sink device to a source device. Not only the source device but also a cable or a repeater device to be connected thereto has compatibility in power supply. A physical address obtained from information of an EDID memory forms a base of CEC message exchange, but a physical address of the cable or repeater device is overlapped with the source device or unknown. The cable or a repeater device uses changes the type of a message while using the same physical address as the source device or use such a message having the physical address information of the source device is described in a parameter of the message using the unknown physical address. The message having a supply or reception current for each device described therein is exchanged with the sink device or the source device to adjust current reception.

Abstract: Disclosed herein are embodiments of a swing compensation scheme for compensating errors in a transmitter driver.

Abstract: A digital audio encoder, digital video conditioner, and a digital modulator are described for producing a television broadcast signal at a desired channel frequency range. Left and right audio channel signals are digitized and encoded according to a stereo standard and then combined to form a stereo audio signal. A second audio programming channel signal may be included. A video input can be digitized and conditioned to form a digital video channel. The stereo audio signal can be placed directly at a desired channel frequency by frequency modulation without the need for using an intermediate frequency. The digital video channel can be placed at a desired frequency by amplitude modulation. The digital and audio channels can be digitally combined to create a television transmission signal at a desired frequency and according to a desired standard.

Abstract: A portable navigation device with a TV function includes a TV module, a navigation module, a display module, a sound module, a first processing unit, a second processing unit and a TV command storage module. The TV module generates baseband TV signals, the navigation module generates position information, the display module displays image information, the sound module plays sounds, the first processing unit performs navigation programs, the second processing unit performs TV programs, and the TV command storage module stores TV commands from the first processing unit and the second processing unit. TV command transmission between the first processing unit and the second processing unit is achieved by sending interrupt signals or reset signals.

Abstract: A receiver receives differential analog video signals from a long distance transmission line and converts them into unbalanced analog video signals to output to an analog video signal line that is internal wiring. A frequency response characteristics corrector inside the receiver corrects the frequency response characteristics attenuated mainly by the long distance transmission line, and a delay corrector corrects differences of propagation delay. A transmitter receives the unbalanced analog video signals form the analog video signal line and converts them into balanced differential analog video signals to transmit to a long distance transmission line as differential analog video signals. A video output circuit outputs the unbalanced analog video signals or unbalanced digital video signals to a video signal line as unbalanced video signals.

Abstract: An embodiment of the present invention provides a method for digital television demodulation, comprising using adjacent-channel power dependent automatic gain control (AGC) for the digital television demodulation, wherein an AGC technique takes into account a total power as well as power of adjacent channels to control gain of a gain control amplifier.

Abstract: The present invention relates to a communication system, a transmitter, a receiver, a communication method, a program, and a communication cable for providing high-speed bidirectional communication while maintaining compatibility. When an HDMI (R) source performs bidirectional IP communication with an HDMI (R) sink using a CEC line and a signal line, a switching control unit controls a switch so that, when data is transmitted, the switch selects a constituent signal forming a differential signal output from a converting unit and, when data is transmitted, the switch selects a constituent signal forming a differential signal output from a receiver. When bidirectional communication is performed using only the CEC line, the switching control unit controls the switch so that the CEC signal output from the HDMI (R) source or the receiver is selected. The present invention is applicable to, for example, HDMI (R).

Abstract: Provided are a wireless television system and a wireless transmitter, capable of automatically turning off a light-emitting unit installed in the wireless transmitter depending on a power state of the wireless transmitter and the wireless television system. The wireless television system includes: a wireless transmitter for relaying a video signal received from the outside; a wireless television for receiving the video signal from the wireless transmitter and displaying an image corresponding to the received composite video signal; a light-emitting unit installed in at least one of the wireless transmitter and the wireless television, and displaying one of a power state and a signal transmission/reception state from one of the wireless transmitter and the wireless television; and a light-emission control unit for controlling the light-emitting unit to emit light when both power of the wireless transmitter and power the wireless television are turned on.

Abstract: A method and apparatus is disclosed that is capable of transmitting video signals and/or audio signals using the HDMI interface standard or the DisplayPort interface standard. A dual mode transmitter is disclosed that is configurable to transmit to a first sink device, configured in accordance with a HDMI display interface, in a HDMI mode of operation and/or a second sink device, configured in accordance with a DisplayPort display interface, in a DisplayPort mode of operation. The dual mode transmitter is configured to receive a biasing current from the first sink device in the HDMI mode of operation or to internally provide the biasing current in DisplayPort mode of operation by selecting impedances from selectable impedance networks. The dual mode transmitter is configured to transmit the video signals and/or audio signals by biasing one or more transistors using the biasing current.

Abstract: A video/sound signal switching and distributing device makes connections to a plurality of video/sound signal receiving devices to be connected at startup of a system and performs authentication between itself and the plurality of video/sound signal receiving devices, thereby acquiring key selection information about a video/sound signal transmitting device and holding the key selection information. Even when another video/sound signal receiving device is connected to the video/sound signal transmitting device while one video/sound signal is already in the middle of displaying a view of the video/sound signal, the video/sound signal transmitting device and the video/sound signal switching and distributing device can again establish a connection without redoing mutual authentication. Hence, disconnection and re-connection of the video/sound signal can be performed without interruption of the video/sound signal being displayed for viewing purpose.

Abstract: An apparatus and method for supplying power to the peripheral circuits of a transmitter circuit, especially an HDMI transmitter circuit, is disclosed. In an HDMI transmitter, the termination resistors of the output driver are part of the receiver. DC power for the driver is supplied through these termination resistors. In prior art implementations, power supplied by the receiver circuit is wasted in the DC set-up circuit of the differential line driver. In various embodiments, this wasted power may be recovered from the remote termination to power selected peripheral circuits of the transmitter. The use of this wasted power may reduce the total system power consumption.

Abstract: A broadcast transmitting system includes a first randomizer randomizing mobile service data bytes; a Reed-Solomon (RS) frame encoder generating an RS frame and dividing the RS frame into RS frame portions; a first interleaver interleaving symbols corresponding to data in the RS frame portions; a group formatter forming data groups including data corresponding to the interleaved symbols, each data group including known data sequences, signaling information, non-systematic RS parity data place holders and MPEG header data place holders; a packet formatter removing the non-systematic RS parity data place holders in the data groups and replacing the MPEG header data place holders in the data groups with Moving Picture Experts Group (MPEG) header data in order to output mobile service data packets; and a second randomizer randomizing the MPEG header data in the mobile service data packets.

Abstract: According to one embodiment, a video transmission apparatus includes a detection unit which detects a communication quality level of a wireless communication channel which wirelessly connects a display device and the video transmission apparatus, a start control unit which starts a process of transmitting video data to the display device via the wireless communication channel if the detected communication quality level exceeds a first threshold value and a hot plug detect signal is received in a state in which transmission of the video data to the display device is stopped, and a stop control unit which stops the transmission of the video data to the display device if the detected communication quality level falls below a second threshold value, which is lower than the first threshold value, in a state in which the process of transmitting the video data to the display device is being executed.

Abstract: A method and apparatus is provided for processing broadcast data in a digital broadcast transmitter. The method includes performing Reed-Solomon (RS) encoding and Cyclic Redundancy Check (CRC) encoding on mobile service data to build an RS frame, dividing the RS frame into a plurality of portions, mapping one of the plurality of portions into a first data group that has a first region and a second region and adding known data sequences and place holders for MPEG header data to the first data group, deinterleaving data in the first data group to output a second data group, replacing the place holders for MPEG header data in the second data group with MPEG header data such that mobile service data packets are output and interleaving data in the mobile service data packets.

Abstract: A moving picture coding apparatus 1 includes: a quantization matrix holding unit (112) that holds a quantization matrix (WM) which has already been transmitted in a parameter set and a matrix ID for identifying the quantization matrix (WM), which are associated with each other; and a variable length coding unit (111) that obtains the matrix ID corresponding to the quantization matrix (WM) used for quantization from the quantization matrix holding unit (112) and places the matrix ID in a coded stream Str.

Abstract: A signal transmitting circuit includes a HDMI signal transmitting unit adapted to output a HDMI signal, a VGA signal transmitting unit adapted to output a VGA signal, a VGA signal processing unit, and a transmitting control unit. The VGA signal processing unit is connected to the VGA signal transmitting unit. The VGA signal processing unit is adapted to receive the VGA signal from the VGA signal transmitting unit, and include a detection signal into the VGA signal to form a combination signal. A transmitting control unit is connected to the VGA signal processing unit and the HDMI signal transmitting unit. The transmitting control unit is adapted to receive the combination signal and the VGA signal, to distinguish the combination signal and the VGA signal, and to output the combination signal and the VGA signal to the appropriate receivers.

Abstract: Mobile/handheld (M/H) data is received in an M/H frame equivalent in size to exactly 20 VSB data frames. Each VSB frame contains an odd VSB field and an even VSB field, and each of the VSB fields includes one field sync segment and 312 data segments. The M/H frame includes main data and M/H data, and the M/H data has more robust coding than the main data. The M/H frame is received and an MPEG encoded transport stream derived therefrom is outputted. Frame registration is found so as to find a structure of the M/H frame in the MPEG encoded transport stream. Based on the structure of the M/H frame, the M/H data is randomized. Based on the structure of the M/H frame, block mode data is located within the randomized M/H data. The M/H data is decoded using the block mode data.

Abstract: A channel equalizer includes a first transformer, an estimator, an average calculator, a second transformer, a coefficient calculator, a compensator, and a third transformer. The first transformer converts normal data into frequency domain data, where a known data sequence is periodically repeated in the normal data. The estimator estimates channel impulse responses (CIR) during known data intervals adjacent to each normal data block. The average calculator calculates an average value of the CIRs. The second transformer converts the average value into frequency domain data. The coefficient calculator calculates equalization coefficients using the average value, and the compensator compensates channel distortion of each normal data block using the coefficients. The third transformer converts the compensated data block into time domain data.

Abstract: A digital broadcasting transmission and/or reception system having an improved reception performance and a signal-processing method thereof. A digital broadcasting transmitter comprises a TRS encoder for to TRS-encode a MPEG-2 transmission stream having null data for inserting a Known data and a TRS parity at predetermined positions, randomizer to input and randomize data stream from the TRS encoder, a null packet exchanger to replace the null data for inserting the Known data to the known data, and an encoder for encoding a data streams to which the Known data is inserted. Accordingly, the present invention detects the known data from a signal received from a reception side and uses the detected known data for synchronization and equalization and further uses the TRS parity for correcting error of the received signal, so that the digital broadcasting reception performance can be improved at poor multipath channels.

Abstract: Methods and apparatus are provided for transmitting and receiving a data stream in a digital video broadcast system. The data stream is segmented into a plurality of segments of the data stream. A frame is generated. The frame includes a preamble section and a data section. The data section carries the data stream, and the preamble section carries signalling information. The frame is transmitted to a receiver. In generating the frame, the data section of the frame is segmented into a plurality of frequency zones, and at least one segment of the data stream is mapped to a frequency zone of the plurality of frequency zones. The signalling information includes first segmentation information of the data stream and second segmentation information of the plurality of frequency zones.

Abstract: A receiver for use in a system for transmission from a transmitter to a receiver, the receiver includes a first frequency divider for outputting a first signal by dividing a signal with a frequency corresponding to a pixel clock or an integral multiple thereof by a reciprocal of an integral multiple of a first natural number, the integral multiple of the first natural number being greater than or equal to 1; and a cycle control portion for outputting a second signal having first and second cycles included within a cycle of the first signal by controlling a cycle of the pixel clock.

Abstract: A pre-processor pre-processes enhanced data packets by coding the enhanced data packets for forward error correction (FEC) and expanding the FEC-coded data packets. A data formatter adds first null data into first place holders within each pre-processed enhanced data packet. A first multiplexer multiplexes the main data packets with the enhanced data packets having the first null data. A holder inserter inserts second null data into second place holders within an enhanced data packet outputted from the first multiplexer. A data interleaver replaces the second null data with parity data. A data generator generates at least one known data sequence. A symbol processor replaces the first null data included in an output of the data interleaver with the known data sequence(s). A non-systematic RS encoder generates the parity data by performing non-systematic RS-coding on an output of the symbol processor, and provides the parity data to the data interleaver.

Abstract: A DTV transmitter includes a pre-processor pre-processing supplemental data, a multiplexer multiplexing pre-processed data with main data, and a byte-symbol converter converting each data byte of the multiplexed data into a symbol. It further includes a symbol processor processing each supplemental data symbol outputted from the byte-symbol converter. It encodes one of upper and lower bits of each supplemental data symbol into first and second data bits, post-decodes the first data bit, and outputs the post-decoded data bit and the second data bit as a symbol. The DTV transmitter further includes a symbol-byte converter converting each symbol outputted from the symbol processor into a data byte.

Abstract: Disclosed are methods, circuits, devices systems for wireless communication of video information. According to some embodiments, an energy level of one or a group of transmit video block(s) to be transmitted as part of a wireless transmission frame may be adjusted so at to maintain a substantially constant transmission power (e.g.

Abstract: A system and method for transmitting over a cellular network television program information to a mobile device, wirelessly transmitting television commands from the mobile device to a television, transmitting from the device over the cellular network television viewing information of what program is being displayed on the television at any particular moment, and transmitting to and from the mobile device over the cellular network any of data, video, text or other information relating to the program then being displayed on the television.

Abstract: An image processing apparatus includes an input unit receiving an encoded image data stream; a decoding processor decoding the stream to obtain image data; a first storage storing the image data; a second storage storing the image data and having a storage area storing at least one picture whose size is the largest of image data to be decoded; a controller analyzing the stream and storing the image data in the first and second storages according to an analysis result; and an output unit reading and outputting the stored pictures in a display order. The controller sets storage areas in the first storage according to image size information, stores the image data in the storage areas, determines whether the image size changes according to the analysis result, and, when the image size changes, stores image data of a picture displayed immediately before the image size changes in the second storage.

Abstract: A method of receiving a data service in a system including a broadcast channel and a data channel, in which at least part of the data service is transmitted by at least the broadcast channel, the method including: receiving, using the data channel, first signalling information relating the data service to an identifier of a first data stream transmitted using the broadcast channel, the identifier being used for signalling in the broadcast channel; receiving, using the data channel, second signalling information relating to a relationship between the first data stream and data capable of being received using the data channel; and selecting one or both of the first data stream and the data capable of being received using the data channel for use in receiving the data service on the basis of the first and second signalling information.

Abstract: A method, a computer readable medium and an apparatus to adaptively control a data transmission rate of a wireless display device. The method includes determining a current data transmission rate capacity of a wireless channel; and controlling a data transmission rate of a wireless transmission device based on the current data transmission rate capacity.

Abstract: A digital television (DTV) receiving system includes a tuner, a demodulator, a known data detector, an equalizer, a transmission detector, and a block decoder. The tuner receives a DTV signal having a data frame in which main and mobile service data are multiplexed. The demodulator demodulates the DTV signal, and the known data detector detects known data included in the mobile service data. The equalizer equalizes the demodulated DTV signal using the detected known data, and the transmission parameter detector detects an error correction mode from the equalized DTV signal. Finally, the block decoder decodes the equalized DTV signal for error correction using the detected error correction mode.

Abstract: Methods and systems are presented for broadcasting a modified live media feed of an event. In an embodiment, the method includes receiving a live media feed at a broadcast computer from one or more recording devices, wherein the live media feed includes real time occurrences of a live event. The live media feed is broadcast after a predetermined delay, and the method includes identifying, during monitoring of the live event, a portion of the live event that is suitable for application of a modification effect. The process also includes the broadcast computer applying the modification effect to a portion of the live media feed corresponding to the identified portion of the live event, and then broadcasting the modified live media feed.

Abstract: Disclosed herein is a reception apparatus for receiving transmitted AV (Audio/Video) content, including: an extractor configured to extract trigger information associated with control of an application program to be executed in conjugation with the AV content; and a controller configured, in response to a command indicated by the extracted trigger information, to control execution of the application program and, if a video of the AV content is switched, execute any one of continuation and termination of the application program that is active.

Abstract: Disclosed herein is a receiver for receiving transmitted AV content, the receiver including an extraction section adapted to extract trigger information, transmitted together with the AV content, about control over an application program to be executed in response to the AV content, and a control section adapted to control the acquisition, registration or activation of the application program, the firing of an event in the active application program, or the suspension or termination of the active application program according to one of the following commands indicated by the extracted trigger information, namely, Pre-cache, Register, Execute, Inject_event, Suspend or Terminate.

Abstract: The present invention discloses a wireless communication system comprising; a function and state maintenance unit that holds a function and a state of receiving side apparatus communicating through wireless communication; a reply unit, while the wireless communication is not established, when transmission side apparatus sends control data to the receiving side apparatus before establishing the wireless communication, that sends pseudo reply signal corresponding to the control data to the transmission side apparatus based on the function and state data held in the receiving side apparatus; a wireless communication establishment unit that establishes wireless communication; a command transmission unit that sends the control data to the receiving side apparatus through the established wireless communication.

Abstract: A method and apparatus for multiplexing a plurality of streams transmitted and received via an audio/video (AV) link by allocating to the plurality of streams a plurality of basic units included in a transmission unit, and generating and transmitting an additional plurality of transmission units.

Abstract: A system and method for dual mode DP and HDMI transmission are provided. Briefly described, one embodiment of a dual mode DP and HDMI transmitter, among others, can be implemented as follows. The dual mode DP and HDMI transmitter comprises a driver circuit controlled by a data signal. The dual mode DP and HDMI transmitter also comprises a control circuit coupled to the driver circuit. The control circuit is configurable to transmit the data signal in a DP mode or a HDMI mode according to a mode signal. One embodiment of a method, among others, comprises: receiving a mode signal; determining whether to configure the dual mode DP and HDMI transmitter for transmitting in a DP mode or an HDMI mode based on the received mode signal; and configuring a dual mode DP and HDMI transmitter in accordance with the determination.

Abstract: A display system and a method of controlling a display system are provided. The display system may include a receiving device to transmit a power control signal across a wireless communication link according to a power on/off command inputted from a user, to receive an audio/video (A/V) signal, to display the A/V signal, and to transmit an acknowledgment signal of the A/V signal. The display system may further include a transmitting device to turn on/off in response to a power control signal received from the receiving device, to transmit the A/V signal to the receiving device, and to control a power thereof according to whether the acknowledgement signal of the A/V signal has arrived.

Abstract: A digital television (DTV) receiving system includes an information detector, a resampler, a timing recovery unit, and a carrier recovery unit. The information detector detects a known data sequence which is periodically inserted in a digital television (DTV) signal received from a DTV transmitting system. The resampler resamples the DTV signal at a predetermined resampling rate. The timing recovery unit performs timing recovery on the DTV signal by detecting a timing error from the resampled DTV signal using the detected known data sequence. The carrier recovery unit performs carrier recovery on the resampled DTV signal by estimating a frequency offset value of the resampled DTV signal using the detected known data sequence.

Abstract: A digital television (DTV) receiving system includes an information detector, a timing recovery unit, a carrier recovery unit, and a phase compensation unit. The information detector detects position information of a known data sequence periodically repeated in a DTV signal and estimates an initial frequency offset value. The timing recovery unit performs timing recovery on the DTV signal by detecting timing error information from the DTV signal using the position information. The carrier recovery unit performs carrier recovery on the DTV signal using the position information. The phase compensation unit compensates a phase offset of the DTV signal using the position information.

Abstract: A content reproducing system having a first device and a second device connected to each other through a transmission path for transmitting content data is provided. The first device includes an outputting unit and an output controlling unit configured to output the content data output from the outputting unit a transmission rate. The second device includes an inputting unit, a storage unit configured to store the content data input by the inputting unit, a transmission rate controlling unit configured to control the transmission rate in accordance with the amount of content data stored in the storage unit, a reproduction clock generating units configured to generate a reproduction clock for reproducing the content data, and a reproducing units configured to read out the content data from the storage unit on the basis of the reproduction clock generated by the reproduction clock generating unit and reproduce the content data.

Abstract: There is provided an audio and/or video transmission system. That audio and/or video transmission system has a microphone unit for detecting an audio signal. The microphone unit has a first wireless transmitting unit for wirelessly transmitting an audio signal by way of a first transmission path and a second wireless transmitting unit for wirelessly transmitting the audio signal by way of a second transmission path. The second wireless transmitting unit is adapted to embed a time stamp in the audio signal to be transmitted by way of the second transmission path.

Abstract: Systems and methods for mobile video streaming are disclosed herein. The systems and methods include a system for rugged mobile streaming of video comprising; a chassis having at least one button further comprising: a video processor, configured to receive video signals from an attached device; and; a transmitter configured to transmit video signals.

Abstract: A communication apparatus (100) includes: a communication unit (10) connectable to one end of a cable (50); a first detection unit (111) which detects a maximum transmission capability of an external device based on a communication standard with which the external device complies, the external device being connected to an other end of the cable (50) connected to the communication unit (10); a second detection unit (112) which detects a maximum transmission capability of the cable (50) connected to the communication unit (10); and an alert output unit (114) which outputs an alert when the maximum transmission capability of the cable (50) is smaller than the maximum transmission capability of the external device, the maximum transmission capability of the cable having been detected by the second detection unit (112), and the maximum transmission capability of the external device having been detected by the first detection unit (111).