Abstract: A method of equalizing signals from a plurality of balanced transmission line cables having different lengths includes providing a first cable having a first length and a second cable having a second length, the first cable coupled to a variable resistor. A first signal is transmitted along the first cable to the variable resistor such that the first signal is attenuated to assume a first frequency domain characteristic. A second signal is transmitted along the second cable such that the second signal is attenuated to assume a second frequency domain characteristic. A voltage of the first signal is divided in the variable resistor such that the first signal assumes substantially the second frequency domain characteristic. The first signal having the second frequency domain characteristic is outputted.

Abstract: An apparatus capable of establishing different video sample stream processing channels between a plurality of video sample stream inputs and a video sample stream output is described. The apparatus includes a multi-state routing network comprising wiring to route a video sample stream. The multi-state routing network comprises outputs that are coupled to the inputs of a plurality of video sample stream channel processing segments, where, each channel processing segment comprises at least one signal processing block. The multi-state routing network also comprises inputs that are coupled to the outputs of the video sample stream channel processing segments. The multi-state routing network also comprises the plurality of video sample stream inputs the video sample stream output.

Abstract: A method (and system) for live video production upon video signals transported over a packeted network, includes a master clock providing a packeted time code signal to the packeted network, and a video source having a source clock that is synchronized to the master clock based upon the packeted time code signal from the master clock.

Abstract: A method and apparatus to display user-guide on-screen display information about a status of an external device on a display device connected with the external device may include attempting to detect a signal from the external device when the display device is in an external input mode, displaying OSD information indicating that a signal is being detected from the external device, for a predetermined time, if no signal is detected in the signal detection operation, and preventing the OSD information displaying operation if a signal is detected in the signal detection operation.

Abstract: A video monitoring system using daisy chain is disclosed. The video monitoring system can display a multiplexed image consisting of four or more pictures by bypassing video signals captured by a plurality of video cameras through several stages.

Abstract: A method for marking a label of an external AV apparatus of the present invention includes displaying an external AV signal outputted from the external AV apparatus of the plurality of external AV apparatuses, and setting and displaying one label of an external AV signal using a label setting signal including a plurality of labels stored beforehand. Accordingly, a user can easily select and watch an external AV signal of the desired external AV apparatus through the label of the external AV apparatus.

Abstract: Receivers (1) comprising television and radio inputs (11,12) for receiving television and radio signals and comprising switching circuits (2) with two first switches (21,22) to be activated in a first mode and located parallelly to the television input (11) and with two second switches (23,24) to be activated in a second mode and located anti-serially to the radio input (12), and control circuits (3) for controlling the switching circuits (2) are modified in such a way that strong radio signals can no longer disturb the television signals. Thereby one of the first switches (21) and one of the second switches (23) together isolate the inputs (11,12) from each other, and the control circuit (3) supplies a first control signal to the first switches (21,22) and supplies a second control signal to non-common points of the anti-serial second switches (23,24). This kind of receivers (1) no longer need different switching circuits (2) for shielded radio inputs and unshielded radio inputs.

Abstract: The invention relates to methods, devices and computer program codes for enabling simple seamless switch over between content related media streams, selecting a switching scheme and performing simplified switch over between such streams, as well as a set of media signals. The media streams (TS1, TS2, TSN) have access units (AU1, AU2, AU3), the lengths of which are made equal by adding filling packets (N). By doing this, overhead data (O1, O2, ON) related to the streams can also be made almost identical. This fact is then used for fast determination of switch over method and simplified seamless switch over between different media streams.

Abstract: According to one embodiment, a video display system receiving a broadcast video signal to perform display according to the video signal includes: a main apparatus including at least a display displaying video according to the video signal and a controller controlling an operation of the main apparatus; one or a plurality of sub apparatuses each including at least a tuner receiving a broadcast video signal and a controller controlling an operation of the sub apparatus by transmitting/receiving a control signal to/from the main apparatus; and a video signal line and a control signal line disposed between the main apparatus and the sub apparatus, the video signal line being for transmission of the video signal from the sub apparatus to the main apparatus and the control signal line being for transmission of the control signal between the main apparatus and the sub apparatus.

Abstract: An information recording apparatus has a stop mode in which only recording means comprised of a rotatable drum on which a recording head is mounted and recording medium driving means comprised of a capstan/pinch roller are stopped, which stop mode can be changed from a record temporary stop mode. During the stop mode of the recording means and the recording medium driving means, a video signal photo-taken by a camera of the information recording apparatus can be outputted externally, and, change to the stop mode is made effective by a combination of user's selection and/or presence/absence of an external connection device.

Abstract: A video switching apparatus has a plurality of slots each for mounting any of a first input module capable of inputting any one of a plurality of predetermined types of video signals and performing processing, content of which varies depending on the type of input video signal and a second input module capable of inputting only predetermined one type of video signal. The video switching apparatus switches and outputs video signals of a plurality of channels input to the input modules mounted to the plurality of slots. The video switching apparatus includes an input setup data memory processor, a detector, and an input setup changer.

Abstract: A device detects one or more physical connections and selects a signal format from a plurality of signal formats based on the one or more physical connections.

Abstract: A method and apparatus of detecting a connection status of a digital video apparatus to a peripheral apparatus includes a digital video encoder configured to receive a digital video signal, and convert and output the digital video signal into an analog video signal, and a determination circuit configured to detect a voltage level of a horizontal synchronization signal of the analog video signal in a vertical blanking time determined by vertical synchronization signals, and determine whether the digital video apparatus is connected to a peripheral apparatus based on a detection result of the voltage of the horizontal synchronization signal of the analog video signal.

Abstract: Disclosed is an audio/video signal auto switching system. The system contains a last-on function block, a memory function block, a switch-back function block, and a memory-reset function block. If there is a plurality of input signals received by the system, then the last-on function block will select a last input signal as an output signal, and the memory function block will record the input sequence of the plurality of input signals. If a non-output signal disappears, the memory-reset function block will sort the input sequence. If the last input signal disappears, the switch-back function block will select the output signal from the plurality of the signals based on the input sequence.

Abstract: A system comprising a first filter having an input and an output adapted to compensate for the characteristics of a first length of twisted-pair wire is disclosed. A first bypass path has an input and an output for bypassing the first filter. A second filter has an input and an output adapted to compensate for the characteristics of a first length of twisted-pair wire. A second bypass path has an input and an output for bypassing the first filter. A third filter has an input and an output adapted to compensate for the characteristics of a first length of twisted-pair wire. A third bypass path has an input and an output for bypassing the first filter. The three filters can be configured form a signal path or one or more filters removed from the signal path by switching in bypass paths.

Abstract: A VCR and optical disk composite medium reproducing apparatus include a key input unit for outputting a command signal upon receiving a user's selection command on an operation mode, and a controller that preferably directly selects a reproducing operation according to a new medium insertion and can output a control signal if the new reproducing medium is inserted while one medium is being reproduced in a DVD unit or in a VCR unit corresponding to the command signal of the key input unit. In such a composite medium recording apparatus and method for using same, the medium can be reproduced effectively and conveniently.

Abstract: An external synchronous signal circuit comprises: means for measuring a phase difference between the external frame synchronous signal (FRM_SYNC) and the frame synchronous signal (FRM) of the digital video signal; means for generating a signal (EXT_H) having the same period as that of the horizontal synchronous signal (HBK) of the digital video signal, the signal (EXT_H) having the measured phase difference with reference to the frame synchronous signal (FRM) of the digital video; and means for generating a signal (EXT_F) having the same period as that of the frame synchronous signal (FRM) of the digital video signal, the signal (EXT_F) having the measured phase difference with reference to the frame synchronous signal (FRM) of the digital video. The generated signals (EXT_F) and (EXT_H) are outputted as an external frame timing signal and an external horizontal timing signal of an external synchronous signal.

Abstract: A self-directing bus amplifier and method is disclosed, which includes an input biased at a given voltage level and a tri-state amplifier with a first input terminal coupled to the biased input and an output coupled to an output bus. A field effect transistor with a gate terminal coupled to the biased input and a source terminal coupled to ground potential with a drain terminal coupled to an inhibiting input of the tri-state amplifier. The drain terminal of the field effect transistor is biased, such that when a signal is present on the input the field effect transistor turns OFF, which enables the tri-state amplifier so that the signal is passed through to the output bus.

Abstract: A band switchable type tuning circuit has first switch means interposed between a power supply Vcc and an anode of a switch diode, a first resistor whose one end is connected to a cathode of the switch diode, second switch means interposed between the other end of the first resistor and a ground, a second resistor connected between the power supply Vcc and a connection point of the first resistor and the second switch means, and the third resistor connected between the ground and a connection point of the first switch means and the anode of the switch diode. The first switch means and the second switch means are turned on or off together by means of a band switching voltage.

Abstract: The present invention suggests a simplified and robust scanning method as a scenario for scanning video sources of a display device such as a TV or projector. The inventive method is attained by way of grouping the video sources and prioritizing the scanning priority for each video source group in terms of the viewing time statistic or the frame number statistic of each video source group. Therefore, the display device is capable of scanning each video source group based on the scanning priority to discover if there is a video signal inputted into the video source.

Abstract: A video apparatus, for instance a video player, comprises a first digital source (e.g. a media player) of a first video digital stream and a video encoder (for generating analogue video signals based on said first video digital stream. The video apparatus also has an input for receiving first analogue video signals comprising synchronization signals. A second digital source generates a second video digital stream based on which the video encoder can generate second analogue video signals synchronized by the synchronization signals of the first analogue video signals for superimposition on the first analogue video signals.

Abstract: A television receiver includes a switching portion which receives each of a video signal received and obtained by an antenna and a video signal read from a storage medium, and selectively outputs one of the video signals in response to an instruction signal for output selection, a detection portion which detects a mode of a video signal, a selection/control portion which supplies the instruction signal for output selection to the switching portion, and outputs a detection result corresponding to a preset specific mode from the detection portion, a signal processing portion which applies sequential scanning conversion processing to the video signal selected and output by the switching portion, and a display portion which displays the video signal subjected to the sequential scanning conversion processing.

Abstract: The invention relates to a television signal receiver comprising a radio-frequency tuner (1) and at least one subsequent surface-acoustic wave filter (2), in which the radio-frequency tuner (1) filters a RF television signal applied to its input and converts it to an intermediate-frequency television signal which is coupled to the surface-acoustic wave filter (2). The RF tuner (1) has at least one output stage (16) which supplies the IF television signal converted to the intermediate frequency. The output stage (16) is directly connected to an output (6) of the RF tuner (1), while a switch (10) is associated with it, by means of which switch the IF television signal is supplied to a second output (8). A further switch (11) is associated with the second output (8), by means of which switch the associated output (8) is switchable to a fixed reference potential.

Abstract: The present invention relates to a dual mode signal processing apparatus using a picture-in-picture (PIP) window. In particular, the present invention relates to a display apparatus and a function switching apparatus that display two views for DSPs performing different functions in use of a PIP window so that two functions are simultaneously performed.

Abstract: A video signal recording and reproduction device of this invention uses one of a plurality of terminals for receiving input of component video signal to also serve as a composite video signal input terminal, thereby reducing a number of the input terminals. This realizes a reduction in size of the device, yet maintains the device to be capable of receiving both inputs of component video signal and composite video signal. The video signal recording and reproduction device of this invention also uses one of a plurality of terminals for outputting component video signal to also serve as a composite video signal output terminal, thereby reducing a number of the output terminals. This realizes a further reduction in size of the device, yet maintains the device to be capable of providing both outputs of component video signal and composite video signal.

Abstract: An AV switching method capable of auto-configuring a plurality of AV input signals and associated apparatus is provided. An audio-video detector capable of auto-configuring the AV input signals includes an audio-video detecting module, an impedance adjustment module, and an audio-video switching module. The audio-video detecting module receives and detects the AV input signals to generate an AV detecting result. The impedance adjustment module adjusts matching impedance for the AV input signals according to the AV detecting result. The audio-video switching module switches the AV input signals to output AV output signals according to the AV detecting result.

Abstract: A digital video mixer apparatus is designed for inputting a video signal representative of a picture from a plurality of input channels, then processing the video signal to apply a visual effect to the picture, and outputting the processed video signal to an output channel. In the apparatus, a parameter value setting section includes a plurality of operators manually operable to set a plurality of parameter values used for applying a desired visual effect to the picture. A sequence control section sequentially feeds the parameter values in accordance with time progress of processing the video signal in order to vary with time the visual effect applied to the picture. A video signal processing section processes the video signal inputted from at least one of the input channels according to either of the parameter values set by the operators or the parameter values fed from the sequence control section.

Abstract: A circuit arrangement and method are disclosed for providing a video signal to a video display from a selectable subset of a plurality of digital video data carried on a plurality of video data channels. The digital video data is generated from video signals from a plurality of video sources, and each video channel selectably carries either color or monochrome video data. A processor is configured and arranged to interpret display commands, and a selector circuit is coupled to the processor. The selector circuit is arranged for connection to the plurality of video data channels and selects digital video data from a subset of the channels responsive to an input selection signal from the processor. A video data sequencer is coupled to the selector circuit and decodes color and monochrome video data from the video channels responsive to configuration signals indicating selected data formats for the channels and merges the selected video data into frames of video data.

Abstract: A synchronization signal generating apparatus and method in which an input circuit is inductively coupled to an alternating current signal line. The input circuit generates a rectified signal. A switch has a switch input and a switch output in which the switch input is electrically connected to the input circuit and is enabled when the voltage of the rectified signal is greater than a predetermined voltage and is disabled when the rectified signal voltage is less than the predetermined voltage. A pulse generating circuit has a pulse generating circuit input and a pulse generating circuit output. The pulse generating circuit input is electrically connected to the switch output. The pulse generating circuit generates a pulse each time the switch is enabled. The synchronization signal generating apparatus is used in a synchronized television display system to signal a video switch to switch the video signal generated by a camera to a monitor based on the occurrence of the synchronization signal.

Abstract: A television (10) for use in a home cinema or surround sound system is provided with an additional audio input (58) for a center audio channel signal from a multi-channel surround sound receiver/amplifier (38). Through system control logic, a control and switching stage (28) within the television couples (72) the televisions internal audio channel signal processing and amplifier stages (GTV,ATV) in parallel to the input (58) when in the surround sound mode, at the same time disabling the audio signal path from the televisions tuner (60) to the audio signal processors (GTV,ATV) and setting (74) the volume level on all channels to a predetermined level to allow volume control (63) from the remote source (38). A home cinema system featuring such a television configuration is also described.

Abstract: A video apparatus comprises an input switching matrix, to which a video input is coupled, the video input comprising a terminal for a component video signal and a CVBS terminal and/or a S-VHS terminal, a synchronization signal detector and a color decoder coupled to the input switching matrix, an output switching matrix coupled to the input switching matrix and to the color decoder, and a microcontroller coupled to the input switching matrix and to the synchronization signal detector for controlling the input switching matrix. The detection of the component video signal is made automatic by means of the microcontroller, the synchronization signal detector and the color decoder.

Abstract: A video signal connection apparatus comprises an array of individual video signal connector contacts arranged in a matrix having connector contact rows and connector contact columns, the individual video signal connector contacts extending in a first connection ‘direction, a connector having individual connector contacts corresponding in number to the individual video signal connector contacts of the array, the individual connector contacts extending in a second connection direction, the second connection direction being orthogonal to the first connection direction and conductors interconnecting the individual video signal connector contacts to the individual connector contacts.

Abstract: Device and method for converting a format of a video signal in a digital TV receiver is provided. Format conversion can be carried out at one chip of a format converting device, inclusive of conversion of resolution, frame rate, scanning method, aspect ratio, color space, chroma format, and gamma correction. Therefore, the digital TV receiver is made to convert a wide range of video signals inclusive of, not only a digital TV broadcasting signal, but also analog TV broadcasting signal, and computer video signal, at one chip of system block. Moreover, the digital TV receiver is made to provide a variety of standards of format converted video signals, not only to the connected display, but also to other general video signal processing devices.

Abstract: A method and apparatus for switching input terminals based on device capability are disclosed. The method supplies a digital signal and an analog signal to a device. The method includes examination of whether or not a device is receiving a digital signal in an eligible format. The method also selects an analog input terminal to receive an analog signal unless the digital signal is being provided in the eligible format. The apparatus includes a digital input terminal to receive a digital signal, an analog input terminal to receive an analog signal, an IEEE1394 interface coupled with the digital input terminal, a HD decoder coupled with the IEEE1394 interface, a memory and a selector which selects the digital input terminal if the digital signal is in an eligible format for the device. The apparatus otherwise selects the analog input terminal.

Abstract: Systems and methods for performing video switching between multiple inputs and outputs are disclosed. In one embodiment, a system includes a video box coupled to one or more user interfaces, a plurality of video inputs, and a plurality of video outputs. The video box includes a video controller coupled to the one or more user interfaces and a video switch coupled to the plurality of video inputs and the plurality of video outputs. Activation of the user interface generates a video control signal that is sent to the generated video control signal. The video controller generates a video switching signal based on the received video control signal. The video switch connects one or more of the plurality of video inputs to one or more of the plurality of video outputs based on the generated video control signal.

Abstract: A system and method for reducing periodic intensity variation in a video image includes applying input signals representing video image data to multiple circuit components by sequentially shifting the input signals through the circuit components to produce output signals that match corresponding input signals. Matching the output signals to the input signals overcomes the effect of inherent differences in characteristics of analog circuit components. It is emphasized that this abstract is provided to comply with the rules requiring an abstract which will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure. It is submitted with the understanding that it will not be used to interpret or limit the scope or the meaning of the claims.

Abstract: A video switching system wherein an integrated circuit designed to switch video signals responsive to a first type of signal is used to switch video signals of a second type of signal which is adapted to emulate the first type of signal. Circuitry for adapting the second type of signal to emulate the first type of signal is disclosed. A plurality of the adapted signals, where each would normally be coupled to their own IC input terminal, are couplable to a single S2 protocol terminal of the integrated circuit, through a single lead.

Abstract: Disclosed are a method and apparatus of processing input signals of a display appliance having a plurality of external input terminals and connected to a set top box with a plurality of external input terminals. The method comprises the steps of: detecting a connecting state to the set top box, a signal receiving state from the set top box, a signal receiving state via the external input terminals of the display appliance; selecting and outputting any one of signals supplied from the set top box and signals supplied via external input terminals of the display appliance; and during outputting the selected signal, if a user requests to output a signal inputted from any one of external input terminals of the set top box and the display appliance, selecting and outputting the selected signal.

Abstract: The invention provides a component selection control system comprising signal output components 2 to 5, signal input components 4, 5, and an amplifier unit 1 having these components 2 to 5 connected thereto. The signal output components 2 to 5 have respective on-off switches 23, 33, 44, 54 provided on signal output lines 73 to 76 for delivering audio signals to the amplifier unit 1 therethrough, and the amplifier unit 1 has a common input terminal g. The signal output lines 73 to 76 of the output components 2 to 5 are connected to one another at a point connected to a common signal line 71, which is connected to the common input terminal g of the amplifier unit 1. This arrangement greatly reduces the numbers of signal lines and terminals required for connecting the components 2 to 5 to the amplifier unit 1.

Abstract: In an image display having a image generator for forming and displaying an optical image in accordance with inputted image signal and a controller for controlling the image generator, a controller (5) has a display-condition switching controller (510, 511) for switching a display-condition of the optical image formed by the image generator, an operation signal receiver (506) for receiving an operation signal for switching the display-condition of the optical image, and a display switching determining portion (509) for monitoring the received operation signal to determine the display-condition to be switched, the display-condition switching controller (510, 511) conducting switching operation based on a judgment of the display switching determining portion (509).

Abstract: A consumer electronic device includes circuitry configured to produce a signal corresponding to a selected one of first, second and third radio frequency channel. The circuitry includes a modulator configured to modulate the video signal such that it falls within a first predetermined frequency range, corresponding to the selected channel. The respective frequency ranges for the first, second and third radio frequency channels are mutually exclusive. Multiple consumer electronic devices are coupled to a combiner which generates a combined signal including the modulated signals from all of the devices. This signal is distributed to a plurality of receivers such that each receiver can receive any of the modulated signals without interference from any of the other modulated signals. The device may also be implemented as a stand-alone device that receives baseband signals, modulates the signals and combines the modulated signals to produce the combined signal.

Abstract: A system, method, and apparatus are provided for selectively isolating particular ICs on an I2C bus system. Selective isolation of particular ICs allows the particular isolated ICs to communicate with each other and/or with other components at a data transfer rate that is greater than the data transfer rate for the I2C bus system. A switch is operative in one mode to selectively isolate an auxiliary or separate I2C portion containing the ICs to be isolated and operative in another mode to allow the auxiliary I2C portion to be part of the main I2C bus sys portion tem. Proper pull-up resistors associated with the switch aid in allowing a faster data transfer rate by speed up of the low to high transition for operation of the isolated ICs.

Abstract: The present invention relates to a video signal processing device for avoiding a phenomenon that noise is upwardly or downwardly shifted due to noise reducing operation when a non-standard signal is input. When a non-standard signal is input as an input video signal, coefficients of interpolating filters for carrying out interpolation on pixels of timely-sequential field video signals are fixed as a non-standard signal supporting signal processing. With this processing, interpolated pixels achieved by the interpolation processing are located at the same vertical spatial position, and pixels which are noise-reduced by the interpolated pixels are located at the same vertical spatial position as pixels before original noise is reduced, thereby locating the pixels at the same horizontal position.

Abstract: A method of switching between video signals in an image switching apparatus is provided, which apparatus has a switch for switching between the video signal supplied by a camera and the video signal supplied by a recording apparatus, and a circuit for processing the video signal coming from the recording apparatus. The processing circuit compares the video signal coming from the recording apparatus with the video signal supplied by the camera and then sets an operating mode on the basis of the comparison result. The output signal from the recording apparatus is a signal which comes from a tape in the replay mode. In the recording and stop modes, the signal entering the recorder is looped through to the output of the video recorder. The two signals have a correlation to each other. A conclusion can thus be drawn on whether the image switching apparatus should work in the replay mode or the recording mode by simple comparison.

Abstract: The present invention is directed to a video signal switching apparatus having editing function to select an arbitrary video signal from plural video signals or carry out synthesis thereof, which allows an operation unit to be of modular configuration every respective functions to electrically connect adjacent modules of panel modules (22A to 22D) which serve as respective operation modules to each other by relay bases (23), (24) to carry out transmission of signals between both modules, and to allow connection between the panel modules (22A to 22D) and the relay bases (23), (24) to be connector connection to thereby have ability to freely change layout of the panel modules (22B to 22D) of division size in which 19 inches rack size is fundamental in accordance with fondness of operator.

Abstract: Each output component (e.g., laserdisc player or output software component) has a source port associated with each type of the output signal that it can output. For example, an output component may output a video signal in RGB format through one source port and may output audio signal in AES formal through another source port. Each input component (e.g., speaker system or input software component) has a sink port associated with each type of input signal that it can input. For example, an input component may input a signal in RGB format through one sink port. The AV system models each port with a corresponding port object. The AV system has a corresponding primitive source port object for each source port and a corresponding primitive sink port object for each sink port.

Abstract: A video production switcher converts an aspect ratio through the use of an integrated aspect ratio converter. Additionally, by having both converted and native format signals input to a switcher processor, the effective number of inputs can be doubled.

Abstract: An analog-to-digital converting apparatus for rapidly processing a plurality of analog input signals at a high rate and a display device using the same. The apparatus includes a clock signal generator that generates a clock signal with a predetermined frequency; a control signal generator that generates a switching control signal using the clock signal; a multiplexer (MUX) that receives and selectively outputs signals of the plurality of analog input signals according to the switching control signal; and an analog-to-digital converter (ADC) that converts an analog signal selected and output by the MUX to a digital signal.

Abstract: A method and apparatus for splicing programs in the MPEG domain, wherein program data is carried in MPEG transport streams (TS) of data packets. The data packets carry application data, e.g. video and audio data, and a header provided with control data. According to the invention control data objects are established for each data packet for storing time references and data packet status information. The control data objects are queued in different queues dependent on the data packet status or on the status of a group of data packets. Control data objects associated to data packets to be output in an output stream of data packets are selected from the queues, whereupon selected control objects are assembled to a program of associated data packets of different kinds of data. Finally, data packets associated to said selected and assembled control data objects are assembled to an output stream of data packets.

Abstract: An image signal recovering apparatus for converting a composite signal and a component signal of a main picture and a sub picture into digital signals, including: a composite selecting unit which selectively outputs at least one of a plurality of composite signals inputted through first input ports of the composite selecting unit; a component selecting unit which selectively outputs at least one of a plurality of component signals inputted through second input ports of the composite selecting unit; a first converting unit for converting composite signals from the composite selecting unit into digital signals; a second converting unit for converting component signals from the component selecting unit into digital signals; and an input switching unit positioned between the component selecting unit and the second converting unit, for selectively switching composite signals from the composite selecting unit and component signals from the component selecting unit into the second converting unit.