WO2007023632A1

WO2007023632A1 - Display device, display method, and display program

Info

Publication number: WO2007023632A1
Application number: PCT/JP2006/314583
Authority: WO
Inventors: Satoru Suzuki; Takahiro Miura; Kai Takasu
Original assignee: Pioneer Corporation
Priority date: 2005-08-23
Filing date: 2006-07-24
Publication date: 2007-03-01

Abstract

A display device (100) has an input section (101) for inputting a video signal, a signal discrimination section (102) for discriminating the signal format of the video signal based on a synchronized signal included in the video signal, a signal processing section (103) for subjecting the video signal, inputted by the input section (101), to video-processing adequate for the determined signal format, and a display section (104) for displaying a video image represented by the video signal having been video-processed by the signal processing section (103).

Description

Specification

Display device, display method, and display program

Technical field

The present invention relates to a display device that displays video, a display method, and a display program.

However, the present invention is not limited to the display device, the display method, and the display program described above.

Background art

Conventionally, a television receiver is widely known as a device for displaying an image. There are various methods of transmitting video signals in a television receiver, such as NTSC (Nationa 1 Television System Committee) method “PAL (Phase Alternation by Line)” and MUSE (Multiple Sub nyquist Sampling Encoding). In addition, with the development of video multimedia, video signals are input in various signal formats such as digital signals.

[0003] In recent years, video signal processing is performed by AZD conversion (analog Z-digital conversion) of the input video signal by using a variety of video signal broadcast transmission methods and signal formats as described above, and by determining the signal using a synchronization signal. Television receivers have been proposed (see, for example, Patent Documents 1 and 2 below).

[0004] Patent Document 1: Japanese Unexamined Patent Application Publication No. 2002-369096

Patent Document 2: Japanese Patent Laid-Open No. 10-215421

Disclosure of the invention

Problems to be solved by the invention

[0005] However, in the above-described conventional television receiver, video signals are input by various methods and signal formats, and therefore there is a signal line for receiving the input of each method or signal format. An example is the problem of necessity and complexity of wiring. Another example is the problem of malfunction caused by noise in the input video signal.

Means for solving the problem In order to solve the above-described problems and achieve the object, the display device according to claim 1 is included in an input unit to which a video signal is input and the video signal input by the input unit. Based on the synchronization signal, the signal format of the video signal is discriminated, and the signal discriminated by the signal discriminating unit with respect to the video signal input by the input unit And a signal processing unit that performs video processing suitable for the format, and a display unit that displays the video represented by the video signal processed by the signal processing unit.

[0007] Further, the display method according to the invention of claim 7 is based on an input process for receiving an input of a video signal and a synchronization signal included in the video signal input in the input process. A signal discrimination process for discriminating the signal format, and a signal process for performing video processing suitable for the signal format on the video signal input by the input process based on the discrimination result discriminated by the signal discrimination process And a display step of displaying an image represented by the video signal processed by the signal processing step.

[0008] In addition, a display program according to the invention of claim 8 causes a computer to execute the display method according to claim 7.

Brief Description of Drawings

[0009] FIG. 1 is a block diagram showing a functional configuration of a display device according to the present embodiment.

FIG. 2 is a flowchart showing the contents of display processing of the display device according to the present embodiment.

FIG. 3 is an explanatory diagram of an example of the interior of the vehicle on which the display device according to the first embodiment is mounted.

FIG. 4 is a block diagram of an example of a hardware configuration of the navigation device according to the first embodiment.

FIG. 5 is a block diagram of an example of functions of the display device according to the first embodiment.

FIG. 6 is a block diagram of an example of the function of the synchronization signal determination unit according to the first embodiment. [FIG. 7-1] FIG. 7-1 is a timing chart showing an example of synchronization signal detection in the horizontal component according to the first embodiment.

FIG. 7-2 is a timing chart of an example of synchronization signal detection in the vertical synchronization signal according to the first embodiment.

FIG. 8 is a flowchart of the process performed by the display device according to the first embodiment.

FIG. 9 is a block diagram of an example of functions of the display device according to the second embodiment.

FIG. 10 is a block diagram of an example of functions of the display device according to the third embodiment.

[0010] 100 display device

101 Input section

102 Signal discriminator

103 Signal processor

104 Display

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, preferred embodiments of a display device, a display method, and a display program according to the present invention will be described in detail with reference to the accompanying drawings.

[0012] (Embodiment)

(Functional configuration of display device)

With reference to FIG. 1, the functional configuration of a display device that is useful in this embodiment will be described. FIG. 1 is a block diagram showing a functional configuration of a display device that works according to the present embodiment. In FIG. 1, the display device 100 includes an input unit 101, a signal determination unit 102, a signal processing unit 103, and a display unit 104.

[0013] A video signal is input to the input unit 101 from the outside. Specifically, the input video signal is, for example, a digital or analog signal. The input in the input unit 101 may be, for example, a configuration performed via an external device and a connection cable, or a configuration performed via a communication device such as a wireless device. [0014] The signal determination unit 102 detects a synchronization signal included in the video signal input to the input unit 101, and determines whether or not the signal format of the video signal is an analog format. The determination of the signal format performed by the signal determination unit 102 is performed, for example, by detecting the periodicity and continuity of the synchronization signal included in the analog signal and comparing it with a predetermined threshold value. The signal format may be determined by taking into account the effects of noise and detecting a stable sync signal to determine the analog signal.

The signal processing unit 103 performs video processing suitable for the signal format of the video signal determined by the signal determination unit 102 on the video signal input by the input unit 101. The signal processing in the signal processing unit 103 is, for example, processing related to a video suitable for each signal format for a video signal in a digital format or an analog format. Specifically, the impedance is adapted to each format. Examples include matching, video signal transfer method conversion, synchronous playback processing, decoding processing, and filtering processing.

The display unit 104 has a display screen (not shown), and displays an image representing the video signal processed by the signal processing unit 103 on the display screen.

[0017] (Contents of display processing of display device)

Next, the contents of display processing of the display device 100 according to the present embodiment will be described with reference to FIG. FIG. 2 is a flowchart showing the contents of the display process of the display device that works according to the present embodiment. In the flowchart of FIG. 2, it is first determined whether or not a video signal has been input by the input unit 101 (step S 201). The video signal is, for example, a digital format signal or an analog format signal.

[0018] If it is determined in step S201 that the video signal is input (step S201: No), the process is repeated until the video signal is input. If it is determined that the video signal has been input (step S 201: Yes), the signal determination unit 102 determines the signal in the video signal based on the synchronization signal included in the video signal input to the input unit 101. Determine the format (step S202).

[0019] In step S202, the signal format may be determined based on the periodicity, continuity, and stability of the synchronization signal included in the video signal. For example, the composite synchronization signal force horizontal component in the video signal is separated. This horizontal component is output at regular intervals. This is done by determining whether or not the force is synchronized with Lus for a predetermined number of times. In addition, it may be configured such that the number of consecutive times with respect to the period of the vertical component of the composite synchronizing signal in the video signal is counted, and a period of a predetermined number of times is determined.

Subsequently, the signal processing unit 103 performs signal processing suitable for the signal format based on the signal format of the video signal determined in step S202 (step S203). For example, the signal format of the video signal is a digital signal or an analog signal.

[0021] Then, the display unit 104 displays a video represented by the video signal in the signal processing unit 103 for the video signal subjected to the video processing suitable for the signal format of the video signal (step S204). Then, a series of processing is completed.

As described above, according to the display device, the display method, and the display program according to the present embodiment, the signal format is determined based on the synchronization signal included in the video signal, and video processing suitable for the signal format is performed. Can be applied. Therefore, for video signal inputs with different signal formats, a common signal can be used without using multiple signal lines for each video signal input and performing video processing on each signal format. Video processing is possible for video signals input via a line.

Example 1

[0023] Hereinafter, Example 1 of the present invention will be described. In the first embodiment, an example in which the display device of the present invention is implemented by a navigation device mounted on a moving body such as a vehicle (including a four-wheeled vehicle and a two-wheeled vehicle) will be described.

[0024] (Description of inside of vehicle equipped with display device)

The interior of the vehicle equipped with the display device according to the first embodiment will be described with reference to FIG. FIG. 3 is an explanatory diagram of an example of the interior of the vehicle in which the display device according to the first embodiment is mounted. In FIG. 3, the interior of the vehicle has a driver seat 311, a passenger seat 312, and a rear seat 313, and the display device 300 a and the passenger seat 312 are arranged around the driver seat 311 and the passenger seat 312. A speaker 301 is provided. The passenger seat 312 is provided with a display device 300b toward the passenger of the rear seat 313.

[0025] Display devices 300a and 300b have monitors 302a and 302b, respectively, and display an image representing a video signal. There may be one or more speakers 301 inside the vehicle. That's fine. In addition, the speaker 301 reproduces a sound such as an internal sound that is provided around the rear seat 313. These display devices 300a and 300b may have a structure that can be attached to and detached from the vehicle.

[0026] (Hardware configuration of navigation device)

Next, the hardware configuration of the navigation device according to the first embodiment will be described with reference to FIG. FIG. 4 is a block diagram of an example of a hardware configuration of the navigation device according to the first embodiment.

In FIG. 4, a navigation device 400 is mounted on a moving body such as a vehicle, and includes a navigation control unit 401, a user IZF (interface) 402, display devices 300a and 300b, and a position acquisition unit 403. A recording medium 404, a recording medium decoding unit 405, an audio output unit 406, a communication unit 407, a route search unit 408, a route guidance unit 409, a guidance sound generation unit 4 10, a speaker 301, Consists of.

The navigation control unit 401 controls the entire navigation device 400. The navigation control unit 401 includes, for example, a CPU (Central Processing Unit) that executes predetermined arithmetic processing, a ROM (Read Only Memory) that stores various control programs, and a RAM (Random) that functions as a work area for the CPU. It can be realized by a microcomputer constituted by an Access Memory).

[0029] The navigation control unit 401, based on the information on the current position acquired by the position acquisition unit 403 and the map information obtained from the recording medium 404 via the recording medium decoding unit 405, upon route guidance, Calculate the driving force on which position on the map and output the calculation result to the display devices 300a and 300b. In addition, the navigation control unit 401 inputs / outputs information related to route guidance with the route search unit 408, the route guidance unit 409, and the guidance sound generation unit 410, and displays information obtained as a result of route guidance. Output to the devices 300a and 300b and the audio output unit 406.

[0030] User IZF 402 acquires information input by the user by operating operation means such as a remote control, a switch, and a touch panel, and outputs the acquired information to navigation control unit 401.

[0031] The display devices 300a and 300b have monitors 302a and 302b, for example, CRT (Cathode Ray Tube), TFT (Thin Film Transistor) liquid crystal display, organic EL ( Includes Electro Luminescence) display, plasma display, LCD (Liquid Crystal Display), etc. Specifically, the display devices 300a and 300b can be configured by, for example, a video display device connected to a video I / F (interface) or a video IZF. Specifically, the video IZF includes, for example, a graphic controller that controls the entire display device, a buffer memory such as VRAM (Video RAM) that temporarily stores image information that can be displayed immediately, and the power of the graphic controller. Based on the output image information, it is configured by a control IC that controls the display of the display device. The display devices 300a and 300b display traffic information, map information, information on route guidance, and various other information.

[0032] The position acquisition unit 403 includes a GPS receiver and various sensor forces, and acquires information on the current position of the moving object (current position of the navigation device 400). The GPS receiver receives the radio waves of GPS satellite power and determines the geometric position with the GPS satellite. GPS is an abbreviation for Global Positioning System, and is a system that accurately determines the position on the ground by receiving radio waves from four or more satellites. A GPS receiver is composed of an antenna for receiving radio waves of GPS satellite power, a tuner that demodulates the received radio waves, and an arithmetic circuit that calculates the current position based on the demodulated information.

[0033] The various sensors are various sensors such as a vehicle speed sensor, an angular velocity sensor, and an acceleration sensor that are mounted on the moving body or the navigation device 400. From the information output from these sensors, the displacement of the moving body is determined. Find the moving speed and moving direction. Thus, by using the output information of the above various sensors together with the information obtained from the received radio wave power of the GPS receiver, the position of the moving body can be recognized with higher accuracy.

[0034] Various control programs and various types of information are recorded on the recording medium 404 so as to be readable by a computer. The recording medium 404 can be realized by, for example, an HD (Hard Disk), a DVD (Digital Versatile Disk), a CD (Compact Disk), or a memory card. The recording medium 404 may accept writing of information by the recording medium decoding unit 405 and record the written information in a nonvolatile manner. [0035] Further, map information used for route search and route guidance is recorded in the recording medium 404. The map information recorded in the recording medium 404 includes background data representing features (features) such as buildings, rivers, and the ground surface, and road shape data representing the shape of the road. The display device 300a, It is drawn in 2D or 3D on the 300b display screen. When the navigation device 400 is guiding a route, the map information read from the recording medium 404 by the recording medium decoding unit 405 and the mark indicating the position of the moving body acquired by the position acquisition unit 403 are displayed on the display device 300a, Will be displayed in 300b

The background data includes background shape data representing the shape of the background and background type data representing the type of the background. The background shape data includes, for example, the representative point of the feature 'polyline • polygon' and the coordinates of the feature. The background type data includes, for example, text data representing the name, address and telephone number of the feature, and type data of the feature such as the building “river” ground surface.

[0037] The road shape data is a road network having a plurality of nodes and links connecting the nodes. A node indicates an intersection where a plurality of roads such as a three-way crossing such as a T-junction, a crossroad, and a five-way crossing. The link indicates a road. Some links have shape interpolation points, and curved roads can be expressed by these shape interpolation points.

[0038] The road shape data further includes traffic condition data. The traffic condition data includes, for example, the presence or absence of traffic lights or pedestrian crossings for each node, the presence or absence of highway entrances and junctions, the length (distance) for each link, vehicle width, direction of travel, road type ( Information on expressways, toll roads, general roads, etc.). In the traffic data, past traffic information is stored by statistically processing past traffic information based on seasons, days of the week, large holidays, and times.

In the first embodiment, the map information is recorded on the recording medium 404, but the present invention is not limited to this. The map information may be recorded on a server outside the navigation device 400. In this case, the navigation device 400 acquires map information from the server via the network via the communication unit 407, for example. The acquired map information is RA It is memorized in M etc.

[0040] The recording medium decoding unit 405 controls reading and writing of information on the recording medium 404. For example, when HD is used as the recording medium 404, the recording medium decoding unit 405 is an HDD (Hard Disk Drive).

[0041] The audio output unit 406 reproduces a sound such as an internal sound by controlling the output to the connected speaker 301. There may be one speaker 301 or a plurality of speakers 301. The audio output unit 406 includes, for example, a DZA converter that performs DZA conversion of audio digital information, an amplifier that amplifies an audio analog signal output from the DZ A converter, and an AZD converter that performs AZD conversion of audio analog information. It can consist of

[0042] The communication unit 407 obtains various types of information from the outside. The communication unit 407 according to the first embodiment includes, for example, an FM (Frequency Modulation) multiplex tuner, a VICS (registered trademark) / beacon receiver, a wireless communication device, and other communication devices, and communicates with other communication devices. To do. Alternatively, it may be a device that can communicate by radio broadcast, television broadcast, or satellite broadcast.

[0043] In the first embodiment, the information acquired by the communication unit 407 includes traffic information such as traffic congestion and traffic regulations distributed by the road traffic information communication system center, and traffic information acquired by the operator in its own method. And other public data on the Internet. For example, the communication unit 407 may request the traffic information of a desired area via a network from a server that accumulates the traffic information of the whole country, and acquire the requested traffic information. Further, it may be configured to receive a video signal from a radio wave such as a television broadcast or a satellite broadcast.

[0044] The route search unit 408 uses the map information acquired from the recording medium 404 via the recording medium decoding unit 405, the traffic information acquired via the communication unit 407, and the like. Search for the optimal route. Here, the optimal route is the route that best matches the user's request.

[0045] The route guidance unit 409 is the optimum route information searched by the route search unit 408, the position information of the moving body acquired by the position acquisition unit 403, and the recording medium decoding from the recording medium 404. Based on the map information obtained via the unit 405, route guidance information for guiding the user to the destination point is generated. The route guidance information generated at this time may be information that considers the traffic jam information received by the communication unit 407. The route guidance information generated by the route guidance unit 409 is output to the display devices 300a and 300b via the navigation control unit 401.

[0046] Guide sound generation section 410 generates information on various sounds such as guide sounds. That is, based on the route guidance information generated by the route guidance unit 409, the virtual sound source corresponding to the guidance point is set and the voice guidance information is generated, and this is output as voice via the navigation control unit 401. Output to part 406.

[0047] (Functional configuration of display devices 300a and 300b)

Next, functions of the display devices 300a and 300b according to the first embodiment will be described with reference to FIG. FIG. 5 is a block diagram of an example of the function of the display device according to the first embodiment.

In FIG. 5, display devices 300 a and 300 b are connected to navigation control unit 401 via connection cable 501. The navigation control unit 401 includes a digital signal input unit 511, an analog signal input unit 512, a signal switching unit 513, a CPU 514, a power supply unit 515, and a communication I / F 516. The display devices 300a and 300b include a communication IZF521, a synchronization signal determination unit 522, a variable termination unit 523, a serial / parallel conversion unit 524, a video signal processing unit 525, a control signal generation unit 526, and a display unit. 527.

[0049] The navigation control unit 401 receives input of the above-described various information from the user IZF 402, the position acquisition unit 403, the recording medium decoding unit 405, the communication unit 407, the route search unit 408, and the route guidance unit 409. Video signals related to display are output to the display devices 300a and 300b. Display-related video signals include digital signals such as digital low voltage differential signal (LVDS) and GVIF (Gigabit Video Interface), and analog R, G, B, Sync (Red, Green, Blue, Signal), analog signals such as Y, U, V, Csync (YUV composite sync signal) and CVideo signal. The digital signal input unit 511 receives a digital signal input and receives an analog signal. The log signal input unit 512 receives an analog signal input.

[0050] The signal switching unit 513 performs processing for switching an input digital signal to an analog signal and processing for switching an analog signal to a digital signal according to the control of the CPU 514. The CPU 514 controls the entire navigation control unit 401, and the power supply unit 515

, Power that is controlled by CPU514, and supply power to each part.

[0051] The communication IZF 516 is an interface that outputs a video signal related to display such as a digital signal or an analog signal switched by the signal switching unit 513 to the display devices 300a and 300b.

Communication IZF 521 receives an input of a video signal output from communication IZF 516 via connection cable 501. The connection cable 501 may be, for example, an FPC (Flexible Printed Circuit) connection cable that is covered with a sheath. Communication iZ F521 outputs the video signal to synchronization signal determination unit 522 and variable termination unit 523.

[0053] The synchronization signal determination unit 522 detects a synchronization (Sync) signal included in the input video signal, and determines whether the video signal is a digital signal or an analog signal based on the detection result. Is determined. For example, the synchronization signal discriminating unit 522 has a periodicity and continuity in which the synchronization signal included in the input video signal is stably based on characteristics regarding the periodicity and continuity of the synchronization signal included in the analog signal. It is the structure which judges whether it is an analog signal power. Details of the synchronization signal determination unit 522 will be described later with reference to FIG.

The variable termination unit 523 terminates the input video signal by changing the termination resistance value depending on the digital format or the analog format in order to prevent reflection of the electrical signal. The termination resistance value may be changed by using a switching circuit or the like.

[0055] The serial-parallel conversion unit 524 converts the video signal transfer method for the input video signal, using the power of the device and the color transfer method inside the device. For example, the serial transfer method uses a single signal line to transfer signals bit by bit, and is resistant to noise and excellent in long-distance signal transfer! / On the other hand, the signal transfer speed is compared. This is a slow transfer method and is generally applied to the transfer method of input signals to devices. The parallel transfer method is a method of transferring signals of multiple bits using multiple signal lines. Although the transfer speed is fast, noise is generated between signal lines and the transmission distance is short, and it is generally applied to the transfer method of input signals inside equipment or between peripheral equipment. In the first embodiment, the digital video signal input by the serial transfer method is converted to the parallel transfer method.

The control signal generation unit 526 generates a control signal including a parameter for processing the video signal in the video signal processing unit 525 based on the result determined by the synchronization signal determination unit 522. The parameters for processing the video signal include, for example, a video processing method and a function used for processing such as a discrimination result of digital signal and analog signal and filtering. In addition, if the device is controlled by a three-wire wire such as the iSCSI (Internet Small Computer System Interface) or SPI (Service Provider Interface), the video signal processing unit is equipped with a display signal generation circuit (not shown) Or, it may be configured to give an appropriate signal from a three-wire wire to instruct the video signal processing unit 525 to be a digital signal or an analog signal.

The video signal processing unit 525 performs signal processing on the video signal related to display in accordance with the control signal generated by the control signal generation unit 526, and outputs the processed video signal to the display unit 527. Video signal processing includes, for example, synchronous playback processing and RGB (Red, Green, Blue) decoding (reading) processing. The display unit 527 is, for example, the above-described monitors 302a and 302b, and includes a CRT, a TFT liquid crystal display, an organic EL display, a plasma display, an LCD, or the like. Then, the display unit 527 displays the video signal.

[0058] (Functional Configuration of Synchronization Signal Discrimination Unit 522)

Next, the function of the synchronization signal determination unit 522 according to the first embodiment will be described with reference to FIG. FIG. 6 is a block diagram of an example of the function of the synchronization signal determination unit according to the first embodiment.

In FIG. 6, the synchronization signal discriminating unit 522 includes a composite synchronization (CSync) signal separation unit 601, a horizontal component (Hin) signal extraction unit 602, a continuity determination unit 603, and a synchronization detection (Syncin) signal. A generation unit 604, a window (Hwin) signal generation unit 605, a vertical synchronization (Vd) signal generation unit 606, and a clock (CLK) generation unit 607 are configured.

[0060] The composite sync (CSync) signal separator 601 is a video signal input to the sync signal discriminator 522. The CSync signal included in the video signal is separated from the signal. For example, the CSync signal is used to reconstruct the screen. The horizontal sync signal that synchronizes in the horizontal direction with a horizontal sync frequency of 15.75 kHz and the vertical sync with a vertical sync frequency of 60 Hz are used. This is a combination of vertical sync signals that take Then, the separated CSync signal is output to the hydration signal (Hin) signal extraction unit 602 and the vertical synchronization (Vd) signal generation unit 606. A clock (CLK) generation unit 607 generates a CLK signal that serves as a reference for the operation of each unit.

The horizontal component (Hin) signal extraction unit 602 extracts only the horizontal component of the CSync signal force as a Hin signal, and outputs the Hin signal to the continuity determination unit 603.

[0062] Window (Hwin) signal generation section 605 generates a Hwin signal having a horizontal frequency cycle. The horizontal frequency can be, for example, pulses output at regular intervals that match the horizontal frequency such as NTSC and PAL! / ヽ.

The continuity determining unit 603 determines whether the Hin signal extracted by the horizontal component (Hin) signal extracting unit 602 is synchronized with the Hwin signal. Also, it is determined whether the Hin signal is continuously synchronized with the Hwin signal for a predetermined number of times or more. If the Hin signal is continuously synchronized with the Hwin signal for a predetermined number of times or more, the H synchronization detection signal (horizontal synchronization detection signal) is output to the synchronization detection (Syncin) signal generation unit 604. The continuity determination unit 603 determines the periodicity of the video signal by comparing the Hin signal with the Hwin signal. Also, the continuity is judged by whether the Hin signal and the Hwin signal are synchronized for a predetermined number of times or more. For example, a configuration in which the user can arbitrarily set a predetermined number of times or more is acceptable. In the first embodiment, it is determined whether synchronization can be continuously performed three times or more.

The vertical synchronization (Vd) signal generation unit 606 generates a Vd signal in the video signal based on the CSync signal separated by the composite synchronization (CSync) signal separation unit 601. The synchronization detection (Syncin) signal generation unit 604 determines the stability of the synchronization signal and generates Syncin. For example, based on the H synchronization detection signal output from the continuity determination unit 603 and the Vd signal generated by the vertical synchronization (Vd) signal generation unit 606, within one cycle (one vertical cycle period) of the Vd signal. The H synchronization detection signal is counted continuously. The number of consecutive times may be set arbitrarily. In the first embodiment, the number of consecutive times is counted 63 times or more. In the first embodiment, the H synchronization detection signal is continuously counted 63 times or more continuously for 3 vertical cycle periods. Then, the Syncin signal is generated assuming that the synchronization signal is stably present in the video signal.

Next, a signal timing chart in each part of the synchronization signal determination unit 522 will be described with reference to FIGS. 7-1 and 7-2. FIG. 7-1 is a timing chart illustrating an example of synchronization signal detection according to the first embodiment.

In FIG. 7A, the timing chart includes a Hin signal 701, a Hwin signal 702, an H register value 703, and an H synchronization detection signal 704.

The Hin signal 701 indicates the horizontal component of the video signal extracted by the horizontal component (Hin) signal extraction unit 602. The Hwin signal 702 is a signal generated by the window (Hwin) signal generation unit 605 and having a horizontal frequency cycle. The H register value 703 is stored in the H register (not shown) of the continuity determination unit 6 03 and is related to the synchronization periodicity and continuity of the Hin signal 701 and the Hwin signal 702 in the synchronization signal included in the video signal. It is a value that includes information.

In the first embodiment, for example, the H register value 703 is a combination of 0 and 1 having a power of 3 digits. In each three-digit value, the right value is LSB (Least Significant Bit), and the left value is MSB (Most Significant Bit). Further, the H register value 703 is configured to shift to the left for each period (1H) of the H win signal 702.

[0069] When the continuity determining unit 603 confirms the synchronization of the Hin signal 701 and the Hwin signal 702, the continuity determining unit 603 sets the LSB of the H register value 703 to 1. If the synchronization of Hin signal 701 and Hwin signal 702 cannot be confirmed, LSB is set to 0. For example, in FIG. 7-1, the leftmost H register value 703 has LSB 1 because Hin signal 701 and Hwin signal 702 are synchronized. Next, since the Hin signal 701 and the Hwin signal 702 are not synchronized on the right side, the H register value 703 is shifted to the left and becomes the LSB force ^. Further, on the right side, since the Hin signal 701 and the Hwin signal 7002 are synchronized, the H register value 703 shifts to the left and the LSB becomes 1.

[0070] The continuity determining unit 603 generates an H synchronization detection signal 704 when the Hin signal 701 and the Hwin signal 702 are synchronized three or more times in succession. For example, in the first embodiment, when the value of the H register value 703 is 111, the H synchronization detection signal 704 is generated.

FIG. 7-2 illustrates an example of synchronization signal detection in the vertical synchronization signal according to the first embodiment. It is a timing chart.

In FIG. 7-2, the timing chart includes a Vd signal 710, an H synchronization detection signal 704, a C LK signal 712, a V register value 713, and a 3 11 ₍ ^ 11 signal 714.

A Vd signal 710 indicates a vertical synchronization signal included in the video signal generated by the vertical synchronization (Vd) signal generation unit 606. The H synchronization detection signal 704 is a signal generated by the continuity determination unit 603 in FIG. A CLK signal 712 indicates a clock signal that serves as a reference for the operation of the synchronization detection (Syncin) signal generation unit 604. The V register value 713 is stored in the V register (not shown) of the synchronization detection (Syncin) signal generation unit 604, and the continuity and stability of the H synchronization detection signal 704 in the synchronization signal included in the video signal. A value that contains information about.

In the first embodiment, for example, the V register value 713 is a combination of 0 and 1 consisting of 3 digits. In each three-digit value, the right value is LSB and the left value is MSB. In addition, the V register value 713 is shifted to the left for each period (one vertical period) of the Vd signal 710.

[0075] The synchronization detection (Syncin) signal generation unit 604 counts the H synchronization detection signal 704 by the CLK signal 712 that is twice the horizontal frequency during one vertical period (IV), and counts 63 times or more. Set LSB of V register value 713 to 1. If the number is less than 63, LSB is set to 0. For example, in Figure 7-2, the leftmost V register value 713 starts with 000 power, and on the right side, the H synchronization detection signal 704 is counted 63 times or more, so the V register value 713 is shifted left. , LSB is 1. Subsequently, since the H synchronization detection signal 704 is counted more than 63 times on the right side, the V register value 713 is shifted to the left and the LSB becomes 1. Furthermore, on the right side, the H synchronization detection signal 704 is counted 63 times or more, so the V register value 713 shifts to the left and the LSB becomes 1, and the V register value 713 becomes 111. The rightmost V register value 713 becomes LSB force as the H synchronization detection signal 704 counts less than 63 times, so it becomes LSB force as it shifts to the left, and the V register value 713 becomes 110.

The synchronization detection (Syncin) signal generation unit 604 generates a Syncin signal 714 when the H synchronization detection signal 704 is counted 63 times or more continuously for three vertical cycle periods. For example, in the first embodiment, when the value of the V register value 713 is 111, the Syncin signal 714 is generated. It is a configuration.

It should be noted that the input unit 101, which is a functional configuration of the display device 100 according to the embodiment, is provided by the communication I ZF 521, and the signal discriminating unit 102 is obtained by the synchronization signal discriminating unit 522 and the control signal generating unit 526. 103 is realized by the variable termination unit 523, the serial-parallel conversion unit 524, and the video signal processing unit 525, and the display unit 104 is realized by the display unit 527.

[0078] (Contents of processing of display devices 300a and 300b)

Next, the contents of processing of the display devices 300a and 300b according to the first embodiment will be described with reference to FIG. FIG. 8 is a flowchart of the process performed by the display device according to the first embodiment. In the flowchart of FIG. 8, first, it is determined whether or not the video signal is input to the communication IZF 521 (step S801). For example, the video signal is a digital digital signal or an analog analog signal, such as a user IZF 402, a position acquisition unit 403, a recording medium decoding unit 405, a communication unit 407, a route search unit 408, and a route guidance unit 409. Input via the unit 401 and the connection cable 501.

If it is determined in step S801 that the video signal has been input (step S801: No), the process is repeated until the video signal is input. If it is determined that a video signal has been input (step S801: Yes), the composite synchronization (CSync) signal separation unit 601 also separates the CSync signal from the video signal power (step S802). Subsequently, the horizontal component (Hin) signal extraction unit 602 extracts the Hin signal 701 from the C Sync signal separated by the composite synchronization (CSync) signal separation unit 601 (step S803).

In addition, window (Hwin) signal generation section 605 generates Hwin signal 702 (step S 804). The Hwin signal may be, for example, a pulse that is output at regular intervals according to the horizontal frequency such as NTSC or PAL.

Then, the continuity determination unit 603 determines whether the Hin signal 701 is a force that is continuously synchronized with the Hwin signal 702 three times or more (step S805). Note that the number of consecutive times is not limited to three, and may be set arbitrarily. When Hin signal 701 is continuously synchronized with Hwin signal 702 three or more times (step S805: Yes), continuity determination unit 603 generates H synchronization detection signal 704. (Step S806), H sync detection The signal 704 is output to the synchronization detection (Syncin) signal generation unit 604.

In addition, the vertical synchronization (Vd) signal generation unit 606 also generates the Vd signal 710 using the CSync signal power separated by the composite synchronization (CSync) signal separation unit 601 (step S807). Note that the processing in step S807 may be performed when the CSync signal is separated in step S802.

[0083] Then, the synchronization detection (Syncin) signal generation unit 604 continuously in the three vertical cycle periods based on the H synchronization detection signal 704 generated in step S806 and the Vd signal generated in step S807, It is determined whether or not the H synchronization detection signal 704 has been counted 63 times or more (step S808).

[0084] In step S808, when the H synchronization detection signal 7004 is counted 63 times or more continuously within 3 vertical cycle periods (step S808: Yes), the synchronization detection (Syncin) signal generation unit 604 generates the Syncin signal. 714 is set to “1” (synchronization signal detection) (step S809), and the Syncin signal 714 is output to the control signal generation unit 526.

[0085] In addition, in step S805, if the Hin signal 701 force Hwin signal 702 is not continuously synchronized three or more times (step S805: No), the synchronization detection (Syncin) signal generation unit 604 The Syncin signal 714 is set to “0” (synchronization signal not detected) (step S813), and the Syncin signal 714 is output to the control signal generation unit 526. Similarly, in step S808, if the H synchronization detection signal 704 is not counted for 63 times or more continuously in three vertical cycle periods (step S808: No), the synchronization detection (Syncin) signal generation unit 604 The Syncin signal is set to “0” (sync signal not detected) (step S813), and the Syncin signal is output to the control signal generator 526.

[0086] In step S809, the control signal generation unit 526, to which the syncin signal "1" is input, generates a control signal for processing the analog signal because the video signal is an analog signal (step S810). Is output to the video signal processing unit 525.

[0087] In step S813, the control signal generation unit 526 having received the Syncin signal "0" generates a control signal for processing the digital signal because the video signal is not an analog signal (it is a digital signal) ( In step S814, the control signal is output to the video signal processing unit 525. [0088] The control signal includes, for example, a video processing method and a function used for processing such as a discrimination result of digital signal and analog signal and filtering as a parameter for processing the video signal. If the video signal processing unit 525 is a device controlled by a three-wire wire such as iSCSI or SPI, a display signal generation circuit (not shown) is provided to provide an appropriate signal for the iSCSI or three-wire wire to The processing unit 525 may be configured to instruct whether the signal is a digital signal or an analog signal.

Then, video signal processing section 525 processes the video signal based on the control signal generated in steps S810 and S814 (step S811). Subsequently, the display unit 527 displays the video represented by the video signal based on the processed video signal (step S812), and ends the series of processing.

[0090] As described above, the display devices 300a and 300b according to the first embodiment do not determine the detection of the analog synchronization signal based on the periodicity alone with respect to the synchronization signal included in the input video signal. Can confirm continuity and stability. Therefore, it is possible to discriminate between a digital signal and an analog signal without being affected by noise caused by a weak electric field.

[0091] In addition, a synchronization signal is detected for the video signals input to the display devices 300a and 300b, and a determination can be made regarding the signal formats of the digital signal and the analog signal. Therefore, the video signal can be communicated with the common connection cable 501 without installing the connection cable 501 for each of the digital signal and the analog signal, so that the number of connection cables 501 can be reduced and installed. The handling becomes easy. In addition, since the signal format can be determined by hardware, it is possible to distinguish between digital signals and analog signals without relying on software, and the device can be simplified.

Note that the display devices 300a and 300b described in the first embodiment can be applied to a device that receives and displays a video signal, not limited to the display device of the navigation device 400.

Example 2

[0093] Next, Example 2 of the present invention will be described. In the second embodiment, an example will be described in which the configuration of the variable termination portion 523 of the display devices 300a and 300b is different from that in the first embodiment. In the second embodiment, the same components as those in the first embodiment will be described using the same reference numerals. In addition, the functions described in FIGS. 6 to 8 in the first embodiment. Since the processing is almost the same, the description thereof is omitted.

[0094] (Functional description of display devices 300a and 300b)

The functions of the display devices 300a and 300b according to the second embodiment will be described with reference to FIG.

. FIG. 9 is a block diagram of an example of the function of the display device according to the second embodiment.

In FIG. 9, the display devices 300a and 300b are connected to the connection cable 50 described in FIG.

1, communication IZF 521, synchronization signal determination unit 522, serial-parallel conversion unit 524, video signal processing unit 525, control signal generation unit 526, display unit 527, signal switching unit 901 And end portions 902 and 903. Note that what is denoted by the same reference numerals as those in FIG. 5 are substantially the same as those in FIG. 5, and only differences will be described.

Communication IZF 521 accepts video signal input from an external device via connection cable 501. It should be noted that the video signal can be input without the connection cable 501 such as wireless communication.

The signal switching unit 901 can switch to a digital signal or an analog signal based on the result of determining the input video signal by the synchronization signal determining unit 522. And

The video signal switched by the signal switching unit 901 is terminated at the subsequent termination units 902 and 903.

[0098] As described above, since the display devices 300a and 300b according to the second embodiment switch the video signal by the signal switching unit 901, and provide a terminal for each signal, the impedance matching is surely performed. Can do.

Example 3

[0099] Next, Example 3 of the present invention will be described. In the third embodiment, since the functions of the video signal processing units 525 of the display devices 300a and 300b are different from those of the first embodiment, an example in which the control signal generation unit 526 is not provided will be described. In the third embodiment, components having the same configuration as in the first embodiment will be described using the same reference numerals. In addition, the functions and processing described in FIGS. 6 to 8 in the first embodiment are substantially the same, and thus the description thereof is omitted.

[0100] (Functional description of display devices 300a and 300b)

The functions of the display devices 300a and 300b according to the third embodiment will be described with reference to FIG. The FIG. 10 is a block diagram of an example of the function of the display device according to the third embodiment.

[0101] In FIG. 10, the display devices 300a and 300b include the connection cable 5001, the communication IZF 521, the synchronization signal determination unit 522, the variable termination unit 523, and the serial parallel conversion unit 524 described in FIG. The video signal processing unit 525 and the display unit 527 are included. Note that the same reference numerals as those in FIG. 5 are the same as those in FIG. 5, and only different points will be described.

[0102] In the third embodiment, the video signal processing unit 525 is not controlled by a three-wire wire such as iSCSI or SPI, but the input video signal is converted into a digital signal analog signal. This is a configuration capable of performing signal processing. Therefore, video signal processing can be performed based on the determination result of the synchronization signal determination unit 522 without generating a control signal.

As described above, the display devices 300a and 300b according to the third embodiment can process video signals without providing the control signal generation unit 526.

Note that the display method described in the present embodiment can be realized by executing a prepared program on a computer such as a personal computer or a workstation. This program is recorded on a computer-readable recording medium such as a hard disk, a flexible disk, a CD-ROM, an MO, and a DVD, and is executed by being read by the computer. The program may be a transmission medium that can be distributed via a network such as the Internet.

[0105] As described above, according to the display device, display method, and display program according to the present embodiment, the signal format is determined based on the synchronization signal included in the video signal, and the video processing suitable for the signal format is performed. Can be applied. Therefore, for video signal inputs with different signal formats, a common signal can be used without using multiple signal lines for each video signal input and performing video processing on each signal format. Video processing is possible for video signals input via a line.

[0106] In addition, the display devices 300a and 300b according to the first embodiment do not determine the detection of the analog synchronization signal based only on the periodicity of the synchronization signal included in the input video signal, and the continuity and stability. Can be confirmed. Therefore, it is affected by noise caused by weak electric fields. Therefore, the digital signal and the analog signal can be accurately discriminated.

[0107] Further, the display devices 300a and 300b according to the first embodiment can detect a synchronization signal for an input video signal and determine the signal formats of a digital signal and an analog signal. Therefore, the video signal can be communicated with the common connection cable 501 without providing the connection cable 501 for each of the digital signal and the analog signal. Therefore, the number of the connection cables 501 can be reduced, and installation and handling can be performed. It becomes easy. In addition, since the signal format can be determined by hardware processing, it is possible to determine digital signals and analog signals without relying on software, thereby simplifying the apparatus.

Note that the display devices 300a and 300b described in the first embodiment can be applied to various devices that receive and display a video signal, not limited to the display device of the navigation device 400. Therefore, the versatility of the display device can be improved.

[0109] In addition, the display devices 300a and 300b according to the second embodiment perform the impedance matching by switching the video signal by the signal switching unit 901 and providing a terminal for each signal. Therefore, the communication of the video signal can be surely brought into a normal state.

Further, the display devices 300a and 300b according to the third embodiment can process video signals without providing the control signal generation unit 526. Therefore, simplification of the apparatus can be achieved.

Claims

The scope of the claims

[1] An input means for inputting a video signal;

Signal determining means for determining a signal format of the video signal based on a synchronization signal included in the video signal input by the input means;

Signal processing means for performing video processing suitable for the signal format determined by the signal determination means on the video signal input by the input means;

Display means for displaying a video represented by the video signal processed by the signal processing means;

A display device comprising:

[2] The signal discrimination means includes

Separating means for separating a composite synchronizing signal from the video signal;

Extraction means for extracting a horizontal signal of a horizontal component from the composite synchronization signal separated by the separation means;

Continuity judging means for judging continuity of the horizontal signal extracted by the extracting means;

Synchronization detection signal generation means for generating a synchronization detection signal based on the determination result determined by the continuity determination means;

The display device according to claim 1, comprising:

[3] The signal discrimination means includes

Window signal generating means for generating a window signal having a predetermined horizontal frequency;

The continuity determination means includes

When it is determined that the horizontal signal extracted by the extracting unit is continuously synchronized with the window signal generated by the window signal generating unit a predetermined number of times, a horizontal synchronization detection signal is generated. The display device according to claim 2, wherein:

[4] The signal discrimination means includes

Based on the composite synchronization signal separated by the separation means, a vertical synchronization signal A vertical synchronization signal generating means for generating

The synchronization detection signal generating means includes

3. The horizontal synchronization detection signal generated by the continuity determination unit is output within a predetermined period of the vertical synchronization signal generated by the vertical synchronization signal generation unit. Display device.

[5] The synchronization detection signal generating means includes

The display according to claim 3, wherein the synchronization detection signal is generated when the horizontal synchronization detection signal in one cycle is counted a predetermined number of times or more continuously in a predetermined cycle of the vertical synchronization signal. apparatus.

[6] The signal discrimination means includes

Whether the signal format of the video signal is an analog signal power or not, the signal processing means,

6. The display device according to claim 1, wherein a control signal related to the processing of the signal format is generated based on a determination result of the signal determination unit.

[7] An input process for receiving video signal input;

A signal determination step of determining a signal format of the video signal based on a synchronization signal included in the video signal input in the input step;

A signal processing step for performing video processing suitable for the signal format on the video signal input by the input step based on the determination result determined by the signal determination step;

A display step of displaying an image represented by the video signal processed by the signal processing step;

A display method comprising:

[8] A display program that causes a computer to execute the display method according to claim 7.