WO2006043547A1 - 通信状態制御装置、通信制御装置、通信処理装置、通信状態制御方法 - Google Patents
通信状態制御装置、通信制御装置、通信処理装置、通信状態制御方法 Download PDFInfo
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- WO2006043547A1 WO2006043547A1 PCT/JP2005/019116 JP2005019116W WO2006043547A1 WO 2006043547 A1 WO2006043547 A1 WO 2006043547A1 JP 2005019116 W JP2005019116 W JP 2005019116W WO 2006043547 A1 WO2006043547 A1 WO 2006043547A1
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- Prior art keywords
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- pull
- control device
- signal waveform
- resistor
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
- H04N5/765—Interface circuits between an apparatus for recording and another apparatus
- H04N5/775—Interface circuits between an apparatus for recording and another apparatus between a recording apparatus and a television receiver
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
- G09G5/003—Details of a display terminal, the details relating to the control arrangement of the display terminal and to the interfaces thereto
- G09G5/006—Details of the interface to the display terminal
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2310/00—Command of the display device
- G09G2310/06—Details of flat display driving waveforms
- G09G2310/061—Details of flat display driving waveforms for resetting or blanking
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2360/00—Aspects of the architecture of display systems
- G09G2360/02—Graphics controller able to handle multiple formats, e.g. input or output formats
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2370/00—Aspects of data communication
- G09G2370/04—Exchange of auxiliary data, i.e. other than image data, between monitor and graphics controller
- G09G2370/045—Exchange of auxiliary data, i.e. other than image data, between monitor and graphics controller using multiple communication channels, e.g. parallel and serial
- G09G2370/047—Exchange of auxiliary data, i.e. other than image data, between monitor and graphics controller using multiple communication channels, e.g. parallel and serial using display data channel standard [DDC] communication
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2370/00—Aspects of data communication
- G09G2370/12—Use of DVI or HDMI protocol in interfaces along the display data pipeline
Definitions
- Communication state control device communication control device, communication processing device, communication state control method
- the present invention relates to a communication state control device, a communication control device, a communication processing device, and a communication state control method for controlling a data communication state.
- a playback system in which content such as television numbers and movies played back by a playback device is output by an output device.
- HDCP High-Bandwidth Digital Content Protection
- CSS Content Scramble System
- CPRM Content Protection for Recordable Media
- CPPM Content Protection
- a reproduction system 600 shown in FIG. 1 includes a cable 700, an output device 800, a reproduction device 900, and the like.
- Cable 700 Digital Visual Interface
- HDMI High- Definitio n Multimedia Interface
- an output device 800 of the device compatible with standard the playback apparatus 900 of the device corresponding to the HDMI standard
- the I 2 Connect to a state where various information can be sent and received by C (Inter-Integrated Circuit) communication.
- the cable 700 is encrypted by a DDC (Display Data Channel) line 710 used for transmission / reception of a serial clock (hereinafter referred to as SCL) and serial data (hereinafter referred to as SDA) and a playback device 900.
- DDC Display Data Channel
- SCL serial clock
- SDA serial data
- the data transmitted / received as SDA includes KSV (Key Selection Vector) data used for the authentication processing (hereinafter referred to as HDCP authentication processing) of each device 800, 900 based on HDCP, and the location based on this KSV data.
- KSV Key Selection Vector
- HDCP authentication processing KSV data used for the authentication processing (hereinafter referred to as HDCP authentication processing) of each device 800, 900 based on HDCP, and the location based on this KSV data.
- EDID Extend Display Identification Data
- the output device 800 is, for example, a projector, a television, or a personal computer that supports the DVI standard and the HDMI standard as described above.
- the output device 800 acquires the content data output from the playback device 900 and outputs it appropriately.
- the output device 800 is a connector 810, the transmission / reception adjustment means 820 is an EEPROM (Electrically Erasable Programmable Read Only Memory) 830, a DVlZHDMI receiver 840, a control unit 850, an audio output unit (not shown), a display And so on.
- EEPROM Electrical Erasable Programmable Read Only Memory
- a connector (not shown) of the cable 700 is detachably connected to the connector 810.
- the connector 810 includes a DDC input / output unit 811 to which the DDC line 710 of the cable 700 is connected, a TMDS input / output unit 812 to which the TMDS line 720 is connected, and the like.
- Transmission / reception adjustment means 820 appropriately adjusts signal components during transmission / reception of SCL and SDA.
- the transmission / reception adjusting means 820 includes a MOSFET (Oxide-Semiconductor Field-Effect Transistor) 821, a resistor 822 of 100 ⁇ , a pull-up resistor 823 having a predetermined resistance value, a pull-up resistor of 4.7 k ⁇ , for example. And 824.
- the resistance value of the pull-up resistor 823 is 2.2 kQ corresponding to the DVI standard or 47 kQ corresponding to the HDMI standard.
- the series circuit of the drain, source, and resistor 822 of the MOSFET 821 is connected between the DDC input / output unit 811 and the DVIZHDMI receiver 840.
- a pull-up resistor 823 is connected between the connection point of the MOSFET 821 and the DDC input / output unit 811 and the 5V reference power supply Vcc.
- a pull-up resistor 824 is connected between the connection point of the MOSFET 821 and the resistor 822 and the 3.3 V reference power source Vc.
- the gate of the MOSFET 821 is connected between the reference power source Vc and the pull-up resistor 824 !.
- the EEPROM 830 is connected to a connection point between the MOSFET 821 and the pull-up resistor 823 via a resistor 831 of 100 ⁇ , for example.
- This EEPROM 830 stores the EDID so that it can be read out appropriately.
- DVIZHDMI receiver 840 is connected to TMDS input / output unit 812, control unit 850, audio output unit, display unit, and the like.
- This DVIZHDMI Resino 840 is based on the KSV data input from the playback device 900 under the control of the control unit 850. Generate data. Then, HDCP calculation data, KSV data of the output device 800, and the like are output to the playback device 900.
- the encrypted content data output from the playback device 900 is decrypted as appropriate, and the audio of the content is output from the audio output unit, or the image is displayed on the display unit.
- the control unit 850 appropriately controls the operation of the DVIZHDMI receiver 840. Specifically, when the control unit 850 detects that the output device 800 is connected to the playback device 900 via the cable 700, the control unit 850 appropriately controls the operation of the DVIZHDMI receiver 840 to generate KSV data, HDCP calculation data, and the like. Output to playback device 900.
- the playback device 900 corresponds to the HDMI standard as described above.
- the playback device 900 performs HDCP authentication processing as appropriate, and performs processing for causing the output device 800 to appropriately output content data included in the playback device 900, for example.
- the playback device 900 includes a connector 910, a gate switch unit 920, a waveform potential adjusting unit 930, a current adjusting unit 940, a content data processing unit 950, an HDMI transmitter 960, a memory 970, and a CPU (Ce ntral Processing Unit) 980 and the like.
- a connector (not shown) of the cable 700 is detachably connected to the connector 910.
- the connector 910 includes a DDC input / output unit 911 connected to the DDC line 710, a TMDS input / output unit 912 connected to the TMDS line 720, and the like.
- the gate switch means 920 is connected to a communication port (not shown) of the DDC input / output unit 911 and the CPU 980.
- the gate switch means 920 is also connected to a switch port (not shown) of the CPU 980.
- this gate switch means 920 connects CPU 980 and DDC input / output unit 911 to a state in which various information can be transmitted and received. If no control signal is input, CPU980 and DDC input / output unit 911 are not connected.
- communication of various data between the CPU 980 and the output device 800 will be described as DDC communication, and communication of various data between the CPU 980 and the content data processing unit 950 and the HDMI transmitter 960 will be referred to as internal communication as appropriate.
- Waveform potential adjusting means 930 adjusts the potential corresponding to the SCL and SDA signal waveforms from the device corresponding to the HDMI standard during DDC communication so that the CPU 980 can recognize the potential. So
- the waveform potential adjusting means 930 includes, for example, a pull-up resistor 931 of 1.8 k ⁇ .
- the resistance value of the pull-up resistor 931 may be any value of 1.5 to 2. OkQ conforming to the HDMI standard.
- This pull-up resistor 931 is connected between the connection point of the DDC input / output unit 911 and the gate switch means 920 and the 5V reference power source Vcc.
- the current adjusting means 940 adjusts the current flowing during internal communication or DDC communication.
- the current adjusting means 940 includes a pull-up resistor 941 having 2 k ⁇ , for example.
- the resistance value of the pull-up resistor 941 may be a value that makes a good state of internal communication!
- This pull-up resistor 941 is connected between the connection point of the communication port of the gate switch means 920 and CPU980 and the 3.3V reference power supply Vc.
- the content data processing unit 950 is connected to the connection point of the communication port of the gate switch unit 920 and the CPU 980, the HDMI transmitter 960, and the like.
- the content data processing unit 950 processes the content data in a state corresponding to various setting values of the output device 800 based on EDID from the control of the CPU 980, and transmits the processed data to the HDMI transmitter 960.
- the content data processing unit 950 includes a storage unit 951, a decoder 952 such as MPEG (Moving Picture Experts Group) video Z audio or DTS (Digital Theater Systems) audio, and I (Interlace) / P (Progressive) video.
- MPEG Motion Picture Experts Group
- DTS Digital Theater Systems
- I Interlace
- P Progressive
- iZP conversion image quality adjustment unit Conversion and image quality adjustment unit (hereinafter referred to as iZP conversion image quality adjustment unit) 953, video converter 954, pixel scaler 955, and the like.
- the storage unit 951 stores content data and the like so as to be appropriately readable.
- the decoder 952 separates the content data into audio data and image data, and transmits the audio data to the HDMI transmitter 960 and the image data to the IZP conversion image quality adjustment unit 953.
- the IZP conversion image quality adjustment unit 953 appropriately performs IZP conversion processing and image quality adjustment processing on the image data from the decoder 952.
- the video converter 954 appropriately converts the image data into digital power as well as analog.
- the pixel scaler 955 appropriately performs image data scaler processing based on various setting information of the output device 800 obtained from the EDID, settings selected by the user, and the like, and transmits the image data to the HDMI transmitter 960.
- the storage means 951 is exemplified by DVDDisc, video tape, hard disk, semiconductor memory, and the like.
- the playback device 900 may be a device that directly handles broadcast wave content such as STB (Set-top Box).
- the HDMI transmitter 960 is connected to a connection point between the gate switch means 920 and the communication port of the CPU 980 and a TMDS input / output unit 912. When the HDMI transmitter 960 recognizes that the output device 800 is connected via the cable 700, it transmits the KSV data of the playback device 900 to the CPU 980.
- the HDMI transmitter 960 generates HDCP calculation data based on the KSV data of the output device 800 acquired by the CPU 980 and transmits it to the CPU 980. Further, the HDMI transmitter 960 encrypts the content data processed by the content data processing unit 950 and outputs it to the output device 800.
- the memory 970 is connected to the CPU 980 and stores the EDID of the output device 800 so that it can be read out appropriately.
- the memory 970 stores various programs developed on an operating system (OS) that controls the operation of the entire playback device 900.
- OS operating system
- CPU 980 acquires HDCP calculation data from output device 800 or HDMI transmitter 960 or EDID of output device 800, and performs control to output content data based on these data.
- the CPU 980 includes communication target switching means 981, device authentication processing means 982, output control means 983, and the like.
- the communication target switching unit 981 detects that the DDC communication is performed by the device authentication processing unit 982, for example, detects that the DDC line 710 is connected to the DDC input / output unit 911 of the connector 910. When it is recognized by the hot plug detect, the control signal is output to the gate switch unit 920. When the device authentication processing means 982 or the like recognizes that internal communication is to be performed, the control signal is not output to the gate switch means 920.
- the device authentication processing means 982 recognizes that the communication target switching means 981 has been set to a state in which DDC communication is possible, the recommended speed of the HDMI standard, for example, the SCL speed of 100 kHz (hereinafter referred to as the SCL speed). DDC communication with the output device 800 is performed as appropriate.
- the device authentication processing unit 982 recognizes that the communication target switching unit 981 has been set to a state in which DDC communication is possible, even if the output device 800 is turned off, the device authentication processing unit 982 supplies 5V to the output device 800. Supply power. Then, the EDID is acquired from the EEPROM 830, and the EDID is stored in the memory 970 so as to be appropriately readable.
- the device authentication processing means 982 recognizes that the internal communication is set to be possible, the content data processing unit 950 or the HDMI transmitter is performed at an SCL speed of 400 kHz, for example, faster than the DDC communication. Implement internal communication with the tta 960. Further, the device authentication processing means 982 authenticates the output device 800 and the playback device 900 based on the HDCP calculation data of the output device 800 and the HDMI transmitter 960 acquired by each communication. If the output device 800 and the playback device 900 can be authenticated, an authentication signal to that effect is transmitted to the output control means 983. If the authentication is not possible, an unauthenticated signal to that effect is transmitted to the output control means 983. .
- the output control means 983 obtains the authentication signal from the device authentication processing means 982, the output control means 983 performs control to output content data permitted to be output as each copyright organization such as CSS, CPRM, or CPPM. Also, when an unauthenticated signal is acquired from the device authentication processing means 982, control is performed so that content data that is permitted to be output is not output.
- the electrical specifications may differ from those of the HDMI standard.
- the resistance value of the pull-up resistor 823 is not 47 k ⁇ conforming to the HDMI standard, or if the resistance value of the pull-up resistor 824 is small, the transmission and reception according to the I 2 C standard cannot be performed satisfactorily.
- Resistive member 860 and resistors 82 2 and 831 may exist in series between DDC input / output unit 811 and DVIZHDMI receiver 840 or EEPROM 830. For this reason, there is a problem that DDC communication between the playback device 900 and the output device 800 may not be performed normally.
- an object of the present invention is to provide a communication state control device, a communication control device, a communication processing device, and a communication state control method that can satisfactorily perform data communication.
- the communication state control device of the present invention is a communication state control device that controls a communication state in a communication unit that performs data communication, and determines whether or not the communication in a predetermined communication state is possible.
- Waveform adjustment control means It is characterized by.
- the communication state control device of the present invention is a communication state control device that controls a communication state in a communication unit that performs data communication, and determines whether or not the communication in a predetermined communication state is possible.
- a communication control apparatus includes the communication state control apparatus according to the present invention described above.
- the communication processing device of the present invention includes the communication state control device of the present invention described above, data processing means for processing data, and the communication for performing data communication with the data processing means and the communication target device. And a connection point between the communication unit and the communication target device and a connection point between the communication unit and the data processing unit are independent of each other.
- the communication processing device of the present invention includes the communication control device of the present invention described above, data processing means for processing data, and the communication means for performing data communication with the data processing means and the communication target device. And a connection point between the communication unit and the communication target device and a connection point between the communication unit and the data processing unit are made independent from each other.
- the communication state control method of the present invention is a communication state control method for controlling a communication state in a communication means for performing data communication by means of an arithmetic means, wherein the arithmetic means is in a predetermined communication state. If the communication capability is determined, and if it is determined that the communication is impossible, the signal waveform adjustment unit adjusts the signal waveform corresponding to the data communicated by the communication unit. Control is performed to adjust the waveform.
- the communication state control method of the present invention is a communication state control method for controlling a communication state in a communication means for performing data communication by a calculation means, wherein the calculation means is in a predetermined communication state.
- the communication speed is different from the communication speed at the time of the communication determined to be impossible.
- the communication means is controlled to perform the communication at a predetermined time.
- FIG. 1 is a block diagram showing a schematic configuration of a conventional reproduction system.
- FIG. 2 is a block diagram showing a schematic configuration of a reproduction system according to an embodiment of the present invention.
- FIG. 3 is a schematic diagram showing a schematic configuration of a DDC communication setting table in the embodiment.
- FIG. 4 is a flowchart showing DDC communication processing in the embodiment.
- FIG. 5 is a block diagram showing a schematic configuration of a playback apparatus according to another embodiment of the present invention.
- FIG. 6 is a block diagram showing a schematic configuration of a playback apparatus according to still another embodiment of the present invention.
- FIG. 7 is a circuit diagram showing a schematic configuration of a waveform potential adjusting means according to still another embodiment of the present invention.
- FIG. 8 is a circuit diagram showing a schematic configuration of waveform potential adjusting means according to still another embodiment of the present invention.
- FIG. 9 is a circuit diagram showing a schematic configuration of a waveform potential adjusting means according to still another embodiment of the present invention.
- Waveform potential adjustment means as signal waveform adjustment means 211A, 212A, 511, 521A, 521B, 521C, 521D Pull-up resistor
- Pull-up connection control means as signal waveform adjustment control means constituting communication state control device, communication control device, and communication processing device
- Device authentication processing means as a communication means that can also function as a communication target specifying information processing means that also functions as a communication speed control means, constituting a communication state control device, a communication control device, and a communication processing device
- Communication setting change means 253 as a determination means, a failure flag storage control means, and a communication switching means that also function as a signal waveform adjustment control means and a communication speed control means, constituting the communication state control device, the communication control device, and the communication processing device.
- Connection state switching means that also functions as signal waveform adjustment control means
- a playback system including a playback device having a communication state control device, a communication control device, and a communication processing device of the present invention will be described as an example.
- the same constituent elements as those of the conventional reproduction system 600 are denoted by the same reference numerals, and the description thereof is omitted or simplified.
- components that are substantially the same as those of the conventional playback system 600 are denoted by the same names, and the description thereof is simplified.
- I 2 C communication is designed to satisfy communication usage under certain specific circuit conditions (when used for internal communication), external communication conditions are unspecified. In this embodiment, which is not limited to communication with devices, communication is made possible to compensate for this.
- 100 is a reproduction system.
- This playback system 100 uses HDCP, a copyright protection technology, to appropriately output contents such as TV programs and movies that are permitted to be output by CSS and CPRM.
- playback system 100 is cable 700 And an output device 800 as a communication target device, a playback device 200, and the like.
- the output device 800 uses the configuration in the conventional reproduction system 600 shown in FIG.
- the playback device 200 is compatible with the HDMI standard.
- the playback device 200 appropriately performs SDA communication as data with the output device 800.
- HDCP authentication processing is appropriately performed based on this SDA, and processing for causing the output device 800 to appropriately output content data included in the playback device 200 is performed.
- the playback device 200 includes a connector 910, a waveform potential adjusting unit 210 as a signal waveform adjusting unit, a content data processing unit 220 as a data processing unit, an HDMI transmitter 230 as a data processing unit, and a storage unit.
- a memory 240 and a CPU 250 as a calculation means are provided.
- Waveform potential adjusting means 210 adjusts the potential corresponding to the signal waveform of SCL or SDA during DDC communication.
- the waveform potential adjusting unit 210 includes an HDMI waveform adjusting unit 211 and a DVI waveform adjusting unit 212.
- the HDMI waveform adjusting means 211 adjusts a signal waveform such as SDA from a device compatible with the HDMI standard during DDC communication so that the CPU 980 can recognize it.
- the HDMI waveform adjusting unit 211 includes, for example, a 1.8 k ⁇ pull-up resistor 211 A and a connection state switching unit 211B.
- the resistance value of the pull-up resistor 211A may be any value of 1.5 to 2. Ok ⁇ conforming to the HDMI standard.
- the series circuit of the pull-up resistor 211A and connection state switching means 211B consists of the DDC input / output unit 911 and the connection point of the DDC communication port (not shown) of the CPU250 (hereinafter referred to as the DDC dedicated connection point) and the 5V reference power supply Vcc Connected between.
- the DDC dedicated connection point functions as the connection point of the communication means and communication target device of the present invention.
- the connection state switching means 211B is connected to an HDMI port (not shown) of the CPU 250. When the control signal is input from the HDMI port, the connection state switching unit 211B connects the pull-up resistor 211A to the reference power source Vcc.
- the DVI waveform adjustment means 212 is an SDA from a device that does not support the HDMI standard at the time of DDC communication, for example, a device that supports the HDMI standard but has a poor communication state, or a device that supports the DVI standard. Adjust the signal waveform to a state that can be recognized by the CPU980.
- the DVI waveform adjusting unit 212 includes, for example, a 4.7 k ⁇ pull-up resistor 212A and a connection state switching unit 212B.
- the resistance value of the pull-up resistor 212A does not conform to the HDMI standard!
- the series circuit of the pull-up resistor 212A and connection state switching means 212B is composed of a pull-up resistor 211A and connection state switching means between the DDC input / output unit 911 and the connection point of the DD250 communication port of the CPU250 and the 5V reference power supply Vcc. It is connected in parallel with the 211B series circuit.
- the connection state switching means 212B is connected to a DVI port (not shown) of the CPU 250.
- the connection state switching unit 212B connects the pull-up resistor 212A to the reference power source Vcc. If no control signal is input, the pull-up resistor 2 12 A is not connected to the reference power supply Vcc.
- the state in which the pull-up resistor 212A is connected to the reference power source Vcc is a state in which the DVI waveform adjusting unit 212 is turned on, and the state in which the pull-up resistor 212A is not connected is a state in which the DVI waveform adjusting unit 212 is turned off. Will be explained.
- the content data processing unit 220 is connected to an internal communication port (not shown) of the CPU 250, the HDMI transmitter 230, and the like.
- the content data processing unit 220 processes the content data into a state corresponding to various setting values of the output device 800 under the control of the CPU 250 by internal communication, and transmits the processed content data to the HDMI transmitter 230.
- the content data processing unit 220 includes a storage unit 221, a decoder 222, an IZP conversion image quality adjustment unit 223, a video converter 224, a pixel scaler 225, and the like.
- the storage means 221 there are a drive and a driver that can be read and stored in a recording medium such as a magnetic disk such as an HD (Hard Disk), an optical disk such as a DVD (Digital Versatile Disc), a magneto-optical disk, and a memory card
- a recording medium such as a magnetic disk such as an HD (Hard Disk), an optical disk such as a DVD (Digital Versatile Disc), a magneto-optical disk, and a memory card
- a recording medium such as a magnetic disk such as an HD (Hard Disk), an optical disk such as a DVD (Digital Versatile Disc), a magneto-optical disk, and a memory card
- the HDMI transmitter 230 is connected to the internal communication port of the CPU 250 and the TMDS input / output unit 912. This HDMI transmitter 230 transmits and receives HDCP calculation data based on the KSV data of playback device 200 and output device 800, and the KSV data of output device 800 Is appropriately implemented by internal communication. Further, the HDMI transmitter 230 encrypts the content data processed by the content data processing unit 220 and outputs it to the output device 800.
- connection points of the content data processing unit 220, the HDMI transmitter 230, and the internal communication port are provided independently of the DDC dedicated connection points.
- the CPU250's inlet threshold for this DDC dedicated connection point is 5 V tolerant.
- the CPU 250's input threshold has a configuration that recognizes some intermediate potential described later as a low level, such as a Schmitt circuit that detects a potential of about 0 to 1.5V as a low level. It is.
- the internal dedicated connection point functions as the connection point of the communication means and data processing means of the present invention.
- the memory 240 stores various information acquired or generated by the CPU 250 so that it can be read out appropriately.
- the memory 240 includes an EDID storage area, a setting table storage area, a setting storage area, a flag storage area, and the like (not shown). It should be noted that here, the force illustrated for the configuration in which the memory 240 includes the above-described four regions is not limited to this. For example, a configuration including the above-described region or a configuration including another region may be used. ,.
- the EDID storage area stores the EDID acquired from the output device 800 by the CPU 250 so that it can be read out appropriately.
- the setting table storage area stores, for example, a DDC communication setting table 20 as shown in FIG.
- the DDC communication setting table 20 is configured by associating 2N (N is a natural number) pieces of DDC communication setting information 21 related to communication settings during DDC communication performed by the CPU 250 as one data structure.
- the DDC communication setting information 21 is information relating to one communication setting.
- the DDC communication setting information 21 is associated as communication setting name information 21A, SCL speed information 21B as communication speed setting information, control signal output information 21C as signal waveform adjustment information, and force S1 as a data structure. It is made up.
- the communication setting name information 21A is information indicating the name of the communication setting, for example, “setting i (i is a natural number equal to or less than N) J”.
- the SCL speed information 21B is information indicating the SCL speed during the DDC communication of setting i.
- the setting (2J-1) Ci is a natural number equal to or less than N) and the SCL speed of the setting (2J) are the same.
- the SCL speed of the setting (2J) is faster than the SCL speed of the setting (2H) (natural number less than Hi).
- the SCL speed of setting 1 and setting 2 that is, the fastest SCL speed is set to 100 kHz, which is the standard speed for I 2 C communication.
- the SCL speed of the setting (2N-1) and setting (2N), that is, the slowest SCL speed is set to 50 kHz.
- the configuration exemplified in the SCL speed between 50 kHz and 100 kHz is not limited to this, and the configuration may be set at 50 kHz or less or 100 kHz or more.
- the control signal output information 21C is information describing that either one of the HDMI port and the DVI port outputs a control signal during DDC communication of setting i.
- the control signal output information 21C corresponding to the setting (2J-1) is information describing that a control signal is output from the HDMI port, that is, that only the HDMI waveform adjusting unit 211 is turned on.
- the control signal output information 21C corresponding to the setting (2J) is information describing that a control signal is output from the DVI port, that is, that only the DVI waveform adjusting unit 212 is turned on.
- each piece of information 21A to 21C of the DDC communication setting information 21 is not limited to the configuration described above, and other configurations may be used as appropriate. That is, for example, the fastest SCL speed may be 100 kHz or higher, for example, 400 kHz, or the slowest SCL speed may be 50 kHz or lower, for example, 30 kHz. Alternatively, the SCL speed of setting 1 may be set to a speed other than 100 kHz, such as 400 kHz or 50 kHz.
- the setting storage area stores the DDC communication setting information 21 corresponding to the setting i set as the communication setting of the DDC communication by the CPU 250 so that it can be read out appropriately.
- this setting storage area any one of the DDC communication setting information 21 incorporated in the DDC communication setting table 20 is stored.
- the flag storage area stores the failure flag F so that it can be read as appropriate.
- This failure flag F indicates whether or not the first DDC communication based on the DDC communication setting information 21 in the setting storage area has failed. For example, if the failure flag F is “0”, it indicates that the first DDC communication has not failed, and if it is “1”, it indicates that the first DDC communication has failed.
- the configuration in which the failure flag F is stored in the flag storage area is illustrated, but the present invention is not limited to this.
- the CPU 250 may be provided with a counter that counts the number of failures without storing the failure flag F.
- the memory 240 stores various programs developed on an OS that controls the operation of the entire playback device 200.
- this memory 240 for example, there is a memory that retains memory even when the power is suddenly shut down due to a power failure etc., such as a CMOS (Complementary Metal Oxide Semiconductor) memory or a flash memory, an EEPROM (Electrically Erasable Programmable) In general, Read Only Memory) is used.
- the memory 240 may be configured to include a drive, a driver, and the like that are readable and stored on a recording medium such as HD, DVD, or optical disc.
- CPU 250 performs control to output content data in the same manner as CPU 980 of conventional playback apparatus 900.
- CPU 250 includes pull-up connection control means 251 as signal waveform adjustment control means, device authentication processing means 252 as communication means that also functions as communication speed control means, signal waveform adjustment control means, and communication speed control means. Also, a determination unit, a failure flag storage control unit, a communication setting change unit 253 as a communication switching unit, an output control unit 254, and the like are provided.
- the pull-up connection control means 251, the device authentication processing means 252 and the communication setting change means 253 constitute the communication state control device and communication control device of the present invention.
- the content data processing unit 220, the HDMI transmitter 230, the pull-up connection control means 251, the device authentication processing means 252, and the communication setting change means 253 constitute the communication processing apparatus of the present invention.
- the communication state control device of the present invention may be configured without the pull-up connection control means 251!
- the pull-up connection control means 251 controls the connection state switching means 211B and 212B of the waveform adjusting means 211 and 212. Specifically, the pull-up connection control means 251 appropriately acquires the control signal output information 21 C from the DDC communication setting information 21 stored in the setting storage area of the memory 240. Based on the control signal output information 21C, the control signal is output to either one of the connection state switching means 21 IB and 212B.
- the control signal may be sequentially switched and output until the communication succeeds in setting 1, setting 2, setting 3, and the like.
- the device authentication processing means 252 appropriately performs HDCP authentication processing. Specifically, the device authentication processing means 252 appropriately acquires the SCL speed information 21B from the DDC communication setting information 21 stored in the setting storage area of the memory 240. Then, DDC communication such as KSV data, HDCP calculation data, and EDID is performed at the speed of this SCL speed information 21B. Further, when the device authentication processing unit 252 recognizes that the DDC communication of the SDA has been successful, it outputs a communication success signal to that effect to the communication setting change unit 253. In addition, when a failure in DDC communication is recognized, a communication failure signal to that effect is output.
- DDC communication such as KSV data, HDCP calculation data, and EDID
- the cause of the failure of the SDA DDC communication can be exemplified by the fact that the low level potential of the SDA signal waveform such as an acknowledge from the output device 800 becomes an intermediate potential, and the acknowledge cannot be recognized correctly. Furthermore, more the rising degree and fall degree of the signal waveform of SCL and SDA, such that the timing of some standard violation or erroneous detection of the communication timing power 2 C communications SCL and SDA can be exemplified. Also, for example, setup, hold time, communication stop conditions, etc. can be exemplified.
- the device authentication processing unit 252 appropriately performs internal communication of KSV data and HDCP calculation data at an SCL speed of 400 kHz, for example. Furthermore, the device authentication processing unit 252 transmits an authentication signal or a non-authentication signal to the output control unit 254 based on whether or not the output device 800 and the playback device 200 can be authenticated.
- Communication setting changing means 253 changes the communication setting of DDC communication as appropriate. Specifically, the communication setting changing unit 253, when the device authentication processing unit 252 recognizes the connection between the playback device 200 and the output device 800, stores the DDC communication setting table stored in the setting table storage area of the memory 240. Get DDC communication setting information 21 of setting 1 from 20, and set the communication setting of DDC communication to setting 1. Then, the communication setting changing unit 253 performs a process of storing the DDC communication setting information 21 of the setting 1 in the setting storage area of the memory 240, that is, a process of storing the setting 1 in the setting storage area.
- the communication setting changing unit 253 obtains a communication success signal from the device authentication processing unit 252, the communication setting changing unit 253 recognizes that the DDC communication based on the communication setting in the setting storage area is successful. And Then, a process of storing again the DDC communication setting information 21 corresponding to the successful communication setting in the setting storage area, that is, a process of storing the successful communication setting in the setting storage area is performed. Further, the communication setting changing means 253 sets the failure flag F to “0”.
- the communication setting changing unit 253 obtains the communication failure signal from the device authentication processing unit 252 and recognizes that the DDC communication based on the communication setting in the setting storage area has failed, the communication setting changing unit 253 sets the failure flag F. Recognize When recognizing that the failure flag F is set to ⁇ 0 '', the first DDC communication is performed due to, for example, an error at the time of unstable communication immediately after the connection of each device 800, 200 is established or the quality of the cable 700. Judge that it may have failed by chance. Then, the process of storing again the DDC communication setting information 21 corresponding to the communication setting that failed once in the setting storage area, that is, the process of storing the communication setting that failed once in the setting storage area is performed.
- the communication setting changing means 253 sets the failure flag F to “1”.
- the communication setting changing means 253 recognizes that the failure flag F force S is set to “l” and DDC communication has failed twice in succession, the DDC communication by the communication setting stored in the setting storage area is not performed. Judge that it is impossible. Then, a process for changing the communication settings is performed. Specifically, the communication setting changing unit 253 acquires the DDC communication setting information 21 of the setting (i + 1) from the DDC communication setting table 20 when, for example, the continuously failed communication setting is the setting i.
- the communication setting changing unit 253 performs a process of storing the DDC communication setting information 21 of the setting (i + 1) again in the setting storage area, that is, a process of storing the changed communication setting in the setting storage area.
- the failure flag F is set to “0”.
- a configuration is described in which DDC communication is determined to be impossible when two consecutive failures occur, but this is not a limitation, and DDC communication is not possible when three or five consecutive failures occur. It is good also as a structure judged to exist.
- the communication setting changing unit 253 recognizes that the connection with the output device 800 is released by, for example, hot plug detection when the cable 700 is pulled out, the communication setting changing unit 253 deletes the DDC communication setting information 21 in the setting storage area. Process to clear the communication settings.
- the output control unit 254 controls to output content data that is permitted to be output by each copyright organization such as CSS and CPRM. Also, when an unauthenticated signal is acquired, control is performed so that content data that is permitted to be output is not output.
- FIG. 4 is a flowchart showing the DDC communication process.
- the user connects the playback device 200 and the output device 800 via the cable 700. Then, when the CPU 250 of the playback device 200 recognizes the connection with the output device 800 by the device authentication processing means 252, as shown in FIG. 4 (step S101), the communication setting changing means 253 sets the communication setting for DDC communication. Is set to 1 (step S102). Then, this setting 1 is stored in the setting storage area (step S 103).
- CPU 250 performs DDC communication processing based on the communication settings stored in the setting storage area (step S104). Specifically, the CPU 250 outputs a control signal to one of the connection state switching means 211B and 212B based on the communication setting in the setting storage area in the pull-up connection control means 251! Then, one of the waveform adjusting means 211 and 212 is turned on. Furthermore, the CPU 250 uses the device authentication processing means 252 to perform DDC communication processing at the SCL speed based on the communication setting in the setting storage area. The device authentication processing unit 252 outputs a communication success signal to the communication setting change unit 253 when recognizing that the DDC communication is successful, and outputs a communication failure signal when recognizing that the DDC communication is successful. Then, the communication setting changing unit 253 determines whether or not the communication success signal is acquired from the device authentication processing unit 252, that is, whether or not the DDC communication is successful (Step S 105).
- step S105 when the communication setting changing means 253 determines that the DDC communication is successful, it sets the failure flag F to “0” (step S106), and sets the successful communication setting in the setting storage area. (Step S107). Then, the device authentication processing unit 252 determines whether or not the DDC communication cutoff request has been recognized (step S108).
- the DDC communication cutoff request for example, the cable 700 may be pulled out.
- the recognition of disconnection from the output device 800 by the above and the recognition of the setting input for turning off the power of the playback device 200 can be exemplified. If it is determined in step S108 that the blocking request has been recognized, the DDC communication process is terminated. On the other hand, in step S108, if the CPU 250 recognizes the blocking request by the device authentication processing means 252 and determines that it is not, the processing of step S104 is performed.
- step S105 determines in step S105 that the DDC communication has failed
- the power flag set in the failure flag F force S "l" that is, the DDC communication has failed continuously. Whether or not (step S109). If it is determined in step S109 that the DDC communication has failed continuously, that is, the failure flag F is set to “0” and is the first failure, the failure flag F is set to “1”. (Step S110). Then, the communication setting changing unit 253 stores the communication setting that has failed once in the setting storage area (step S 111), and performs the process of step S 108.
- step S109 determines whether or not the DDC communication has failed continuously.
- step S112 determines whether or not the DDC communication based on all the DDC communication setting information 21 in the DDC communication setting table 20 has failed continuously. If it is determined in step S112 that the continuously failed DDC communication is the setting (2N) DDC communication, the process of step S102 is performed. On the other hand, if the communication setting changing means 253 determines in step S112 that the consecutively failed DDC communication is not the setting (2N) DDC communication, the communication setting changing means 253 changes the communication setting (step S113).
- step S114 change the communication setting to setting 2 when the consecutively failed communication setting is setting 1
- step S115 performs the process of step S108.
- Vout Potential of signal waveform output from output device 800 (output is 0V when intermediate potential occurs)
- V211 Voltage value of reference power supply Vcc to which HDMI waveform adjustment means 211 is connected (5V)
- R211A Resistance value of pull-up resistor 211 A
- R860 Resistance value of resistance member 860
- the resistors R822 and 831 in this case are set to 0 ⁇ .
- Vinl (R700 + R860) X il
- the value of R700 is 20 ⁇
- the value of R860 is 300 ⁇
- R211A on the playback device side is 1.
- the current value i2 and the potential Vin2 at the connection point of the bullup resistor 212A and the DDC dedicated connection point are the following numbers respectively: 3 Calculated using the formula shown in Equation 4.
- V212 Voltage value of reference power supply Vcc to which DVI waveform adjustment means 212 is connected
- R212A Resistance value of pull-up resistor 212A
- Vin2 (R700 + R860) X i2
- the potential Vin2 when the potential of the signal waveform output from the output device 800 becomes low level is Than It becomes about 0.32V.
- the HDMI waveform adjusting unit 211 corresponds to the potential Vin2 corresponding to the state in which the DVI waveform adjusting unit 212 is turned on. It becomes lower than the potential Vinl corresponding to the ON state.
- the CPU 250 of the playback device 200 causes the communication setting changing unit 253 to appropriately store the communication setting for DDC communication in the setting storage area of the memory 240. Then, the CPU 250 controls the pull-up connection control means 251 to cause the waveform potential adjustment means 210 to adjust the signal waveform of SDA during DDC communication based on the communication settings stored in the setting storage area. Specifically, the pull-up connection control unit 251 turns on one of the waveform adjustment units 211 and 212. When the DVI waveform adjusting means 212 is turned on, the SDA signal is compared to when the HDMI waveform adjusting means 211 having the bull-up resistor 211A having a resistance value smaller than that of the pull-up resistor 212A is turned on.
- the low-level intermediate potential corresponding to the waveform (hereinafter abbreviated as the intermediate potential of the signal waveform) drops. Furthermore, depending on the resistance value of the pull-up resistor 211A or the pull-up resistor 212A, the timing of the signal waveform changes due to the rise or fall of the signal waveform becoming gentle or steep. Thereafter, the CPU 250 performs DDC communication in the device authentication processing unit 252 and outputs a communication success signal or a communication failure signal to the communication setting change unit 253 based on whether or not the DDC communication is successful. .
- the communication setting changing unit 253 determines that DDC communication based on the communication setting stored in the setting storage area is impossible based on the communication failure signal, the communication setting changing unit 253 changes the communication setting stored in the setting storage area. . Thereafter, the pull-up connection control means 251 controls the waveform potential adjustment means 210 to adjust the SDA signal waveform during DDC communication based on the changed communication setting.
- the playback apparatus 200 lowers the intermediate potential of this signal waveform by causing the pull-up connection control means 251 to adjust the SDA signal waveform, such as an ack, by the waveform potential adjustment unit 210. Can do. Therefore, the playback device 200, for example, caused the failure of DDC communication with the output device 800 corresponding to the DVI standard due to the intermediate potential of the signal waveform. If the SDA cannot be correctly recognized, the SDA can be correctly recognized by adjusting the SDA signal waveform under the control of the pull-up connection control means 251.
- the reason why the intermediate potential is generated is that the resistance values of the resistors 822, 831 and the resistor member 860 connected in series between the CPU 250 and the DVIZHDMI receiver 840 are large, and each waveform adjustment means that is turned on
- the pull-up resistors 211A and 212A of 211 and 212, and the pull-up resistors 823 and 824 have a small resistance value
- the resistance value of the cable 700 is proportional to the length of the cable 700.
- the reproducing apparatus 200 can change the timing of the SDA signal waveform by the waveform potential adjusting means 210.
- the pull-up connection control means 251 controls the SDA signal waveform.
- the SDA can be correctly recognized by changing the timing.
- the reason to deviate transmission timing power 2 C standard force, the pull-up resistor 211A of the playback apparatus 200, inconsistencies or the resistance value of the pull-up resistor 823, 824 of the output device 800 and 212A, the cable 700 Length The resistance value and the capacitance component of the cable 700 corresponding to can be illustrated. Therefore, the playback device 200 can improve the SDA communication.
- the waveform potential adjusting means 210 includes pull-up resistors 211 A and 212 A connected to the reference power supply Vcc. Then, the pull-up connection control means 251 connects one of the pull-up resistors 211A and 212A to the reference power source Vcc to adjust the signal waveform. Therefore, the reproducing apparatus 200 can adjust the signal waveform and correctly recognize SDA with a simple configuration in which one of the pull-up resistors 211A and 212A is simply connected to the reference power source Vcc. Therefore, the playback apparatus 200 can improve the SDA communication with a simple configuration.
- the waveform potential adjusting means 210 includes connection state switching means 21 IB and 212B for connecting the pull-up resistors 211A and 212A to the reference power source Vcc, respectively.
- the bullup connection control means 251 controls the connection state switching means 211B and 212B to connect one of the pull-up resistors 211A and 212A to the reference power supply Vcc and adjust the signal waveform. Therefore, the playback device 200 connects the pull-up resistors 211A and 212A to the reference power source Vcc with a simple configuration that only controls the connection state switching means 211B and 212B. be able to. Therefore, the playback apparatus 200 can improve the SDA communication with a simpler configuration.
- the waveform potential adjusting unit 210 includes connection state switching units 21 IB and 212B corresponding to the pull-up resistors 211A and 212A, respectively. Then, the pull-up connection control means 251 controls the connection state switching means 21 IB and 212B depending on whether or not a control signal is output to the connection state switching means 211B and 212B. For this reason, for example, one connection state switching means for selectively connecting one of the pull-up resistors 211A and 212A to the reference power supply Vcc is provided, and one force is selected for this connection state switching means. Compared with the configuration that outputs the control signal, the configuration of the control signal can be simplified. Therefore, the playback apparatus 200 can improve the SDA communication with a simpler configuration.
- the communication setting changing unit 253 outputs a control signal from the HDMI port for the first communication setting, that is, a state in which the HDMI waveform adjusting unit 211 including the pull-up resistor 211A conforming to the HDMI standard is turned on. Set to. For this reason, the playback device 200 can minimize the number of signal waveform adjustments when an external device compatible with the HDMI standard is connected in the same manner as the playback device 200. Therefore, the playback device 200 can improve the SDA communication.
- the communication setting changing means 253 stores the DDC communication setting information 21 stored in the setting table storage area of the memory 240 in the setting storage area. Then, the pull-up connection control unit 251 turns on one of the waveform adjustment units 211 and 212 based on the control signal output information 21C of the DDC communication setting information 21 in the setting storage area. Therefore, the pull-up connection control means 251 can adjust the signal waveform with a simple configuration that only acquires the control signal output information 21C in the setting storage area. Therefore, the playback device 200 can further improve the SDA communication.
- the CPU 250 of the playback device 200 performs DDC communication processing at the SCL speed based on the communication setting stored in the setting storage area in the device authentication processing means 252.
- the SCL speed is changed, the SDA signal waveform rises and falls.
- the communication timing of SCL and SDA is also changed.
- the communication setting changing means 253 If it is determined that DDC communication using the communication settings stored in the setting storage area is impossible based on the communication failure signal from the device authentication processing means 252, the communication settings stored in the setting storage area are changed. To do.
- the device authentication processing means 252 performs DDC communication processing at the SCL speed based on the changed communication setting.
- the playback device 200 can change the communication timing of SCL and SDA by changing the SCL speed in the device authentication processing means 252. Therefore, the playback device 200 may cause the failure of DDC communication. If the communication timing corresponds to the rise or fall of the signal waveform of SCL or SDA, SDA can be correctly recognized by changing the SCL speed in device authentication processing means 252. Therefore, the playback device 200 can improve the SDA communication.
- the communication setting changing means 253 sets the initial communication setting to the SCL speed recommended by the HDMI standard. Therefore, the playback device 200 can minimize the number of times the SCL speed is changed when an external device compatible with the HDMI standard is connected, as with the playback device 200. Therefore, the playback device 200 can further improve the SDA communication.
- the device authentication processing means 252 performs DDC communication at the SCL speed based on the SCL speed information 21B of the DDC communication setting information 21 in the setting storage area. For this reason, the device authentication processing means 252 can change the SCL speed with a simple configuration that only acquires the SCL speed information 21B of the setting storage area. Therefore, the playback device 200 can further improve the SDA communication.
- communication setting changing means 253 recognizes that DDC communication by the communication setting stored in the setting storage area has failed twice in succession, it determines that DDC communication by this communication setting is impossible. . For this reason, if the DDC communication accidentally fails due to, for example, an error immediately after the connection with the output device 800 is confirmed, the communication setting changing unit 253 again performs the DDC communication with the communication setting that has been accidentally failed to the device authentication processing unit 252. It can be made. Therefore, the playback device 200 can reduce the number of times to change the communication setting compared to a configuration in which it is determined that DDC communication is impossible due to one failure.
- the communication setting changing unit 253 sets the failure flag F stored in the memory 240 based on the communication success signal and the communication failure signal from the device authentication processing unit 252. And Based on the setting of this failure flag F, it recognizes that DDC communication has failed twice in succession. For this reason, the communication setting changing means 253 can determine whether or not the DDC communication has failed twice consecutively based on the failure flag F, which is simpler in configuration than the counter that counts the number of failures, for example. Therefore, the playback device 200 can improve the SDA communication with a simpler configuration.
- CPU 250 determines that DDC communication is impossible, CPU 250 performs control to adjust the signal waveform by pull-up connection control means 251, and control to change the SCL speed by device authentication processing means 252. To do. For this reason, the CPU 250 can correctly recognize the SDA regardless of whether the failure of the DDC communication is due to the influence of the intermediate potential of the signal waveform or the influence of the communication timing. Therefore, the playback device 200 can further improve the SDA communication.
- communication setting changing means 253 determines that DDC communication is impossible, communication setting changing means 253 communicates in a state in which one of control for adjusting the signal waveform and control for changing the SCL speed is performed. Change the setting. For this reason, the communication setting changing means 253 changes the communication setting to more turns compared to the configuration in which the communication setting is changed so that both the control for adjusting the signal waveform and the control for changing the SCL speed are always performed. it can. Therefore, the playback device 200 can cope with the cause of failure of more patterns of DDC communication.
- the DDC dedicated connection point and the internal dedicated connection point are provided independently of each other! /.
- the playback device 200 is provided with gate switch means 920 for setting the DDC communication in a state capable of DDC communication as in the conventional playback device 900, and current adjustment means 940 for adjusting the current during internal communication or DDC communication.
- gate switch means 920 for setting the DDC communication in a state capable of DDC communication as in the conventional playback device 900
- current adjustment means 940 for adjusting the current during internal communication or DDC communication.
- the configuration of the playback device 200 can be simplified.
- the rise in the potential corresponding to the signal waveform is suppressed, and the rise and fall of the signal waveform is slow. Can be reduced.
- an internal dedicated connection point is used for internal communication, it is possible to make it impossible to observe the external communication force.
- the problem of intermediate potential can be solved by setting the CPU 250 input threshold at the dedicated connection point for DDC. [0093] Then, the total input current and leakage current depending on the communication power supply voltage value, bus capacitance, number of connected devices, signal waveform rise time and fall time corresponding to the communication speed, pull-up resistance value, IC ( (Integrated Circuit) If the relationship between various states such as input series resistance is not appropriate, the timing of the signal waveform and the intermediate potential may deviate from the standard value and communication may not be performed properly. Playback device that performs I 2 C communication The communication state control device, the communication control device, and the communication processing device of the present invention are applied to 200.
- terminals such as HDMI transmitter 230, CPU250 or DVI / HD Ml receiver 840, board pattern capacity (not shown) of each device 200, 800, capacity corresponding to the length of cable 700 Etc.
- Examples of the IC input series resistance value include the resistance values of the resistors 822 and 831 and the resistance member 860.
- the playback device 200 can bring the above-mentioned various states into an appropriate relationship by turning on one of the waveform adjusting units 211 and 212 or changing the SCL speed.
- SDA signal waveform timing and intermediate potential can be kept within the I 2 C communication standard values. That is, for example, even if a cable 700 having a length not conforming to the HDMI standard is connected, the timing of the signal waveform and the intermediate potential can be kept within the standard value of I 2 C communication. Therefore, the playback device 200 can improve I 2 C communication.
- the playback device 300 shown in FIG. 5 includes a connector 910, a gate switch unit 920, a waveform potential adjusting unit 210, a current adjusting unit 310, a content data processing unit 220, an HDMI transmitter 230, a memory, and the like. 240, CPU320, etc.
- the waveform potential adjusting unit 210 includes an HDMI waveform adjusting unit 211 and a DVI waveform adjusting unit 212.
- the series circuit of the pull-up resistor 211A and connection state switching means 211B of the HDMI waveform adjusting means 211 is composed of the connection point of the DDC input / output unit 911 and the gate switch means 920 (hereinafter referred to as the DDC connection point) and the 5V reference power supply Vcc. Connected between.
- D The series circuit of the VI waveform adjustment means 212 pull-up resistor 212A and connection state switching means 212B is composed of a pull-up resistor 211 between the connection point of the DDC input / output unit 911 and the gate switch means 920 and the 5V reference power supply Vcc.
- a and connection state switching means 211B are connected in parallel with the series circuit.
- the current adjustment unit 310 includes a first adjustment unit 311 and a second adjustment unit 312.
- the first adjusting means 311 includes a pull-up resistor 311A having 22 k ⁇ , for example.
- the resistance value of the pull-up resistor 311 A is a value that adjusts the current to flow less than the pull-up resistor 941 of the conventional current adjusting means 940, that is, larger than the conventional pull-up resistor 941! /, If it is a resistance value! /, It may be a deviation value.
- This pull-up resistor 311A is connected between the connection point of the communication port of the gate switch means 920 and CPU320 and the 3.3V reference power supply Vc!
- the second adjustment means 312 includes, for example, a 2.2 k ⁇ pull-up resistor 312A, a PNP transistor 312B, a resistor 312C having a predetermined resistance value, and a resistor 312D having a predetermined resistance value. Yes.
- the series circuit of the collector and emitter of the pull-up resistor 312A and PNP transistor 312B is connected in parallel with the pull-up resistor 311 A between the connection point of the gate switch means 920 and CPU320 communication port and the 3.3V reference power supply Vc. It is connected.
- the resistance value of the pull-up resistor 312A may be any value such that the combined resistance value with the pull-up resistor 311A is a value that improves the implementation state of internal communication.
- the resistance value of the pull-up resistor 312A is set so that the combined resistance value is 2 k ⁇ , which is the same as that of the conventional pull-up resistor 941.
- the base of the PNP transistor 312B is connected to the switch port of the CPU 320 via the resistor 312C. Further, a resistor 312D is connected between the emitter and base of the PNP transistor 312B.
- the state in which the pull-up resistor 312A is connected to the reference power source Vc is the state in which the second adjusting means 312 is turned on, and the state in which the pull-up resistor 312A is not connected is the second adjustment state.
- the state in which the adjusting means 312 is turned off will be referred to as appropriate.
- a circuit composed of the PNP transistor 312B and the resistors 312C and 312D will be described as a digital transistor (hereinafter referred to as a digital transistor) 312E as appropriate.
- CPU 320 includes communication target switching means 321, pull-up connection control means 251, device authentication processing means 252, communication setting changing means 253, output control means 254, and the like.
- the communication target switching unit 321 controls the gate switch unit 920 and the second adjustment unit 312. Specifically, when communication target switching means 321 recognizes that device authentication processing means 252 performs DDC communication, it outputs a control signal to gate switch means 920 and digital controller 312E. Also, when the device authentication processing means 252 or the like recognizes that internal communication is to be performed, the control signal is not output to the gate switch means 920 and the digital camera 312E.
- the communication target switching means 321 causes the gate switch means 920 to To enable DDC communication.
- the communication target switching means 321 outputs a control signal to the gate switch means 920 and the digital camera 312E.
- the playback device 300 is connected to the CPU 320 and the DDC input / output unit 911, and is ready for DDC communication.
- the second adjustment means 312 is turned off because the control signal is input to the base of the PNP transistor 312B.
- the CPU 320 executes the processing of step S102 shown in FIG. 4 and step S115.
- the CPU 320 of the playback device 300 can cause the failure of DDC communication to be caused by the influence of the intermediate potential of the signal waveform or the influence of the communication timing. , SDA can be recognized correctly. Therefore, the playback device 300 can improve the SDA communication.
- the second adjusting means 312 is turned off during DDC communication and turned on during internal communication.
- the combined resistance value of the pull-up resistors 311 A and 312A becomes 2k Q that improves the internal communication implementation state during internal communication that is turned on, and 22k during DDC communication when the second adjustment means 312 is turned off. ⁇ . For this reason, internal communication can be made favorable.
- the current that flows during DDC communication can be reduced compared to that during internal communication. Potential can be lowered. Therefore, the intermediate potential of the signal waveform can be lowered,
- the playback apparatus 400 shown in FIG. 6 includes a connector 910, a gate switch unit 920, a waveform potential adjustment unit 410 as a signal waveform adjustment unit, a current adjustment unit 940, a content data processing unit 220, and an HDMI transmitter. 230, memory 420, CPU 430, etc.
- the waveform potential adjusting unit 410 includes a first waveform adjusting unit 411 and a second waveform adjusting unit 412.
- the first waveform adjusting means 411 includes a first pull-up resistor 411 A of 2.2 k ⁇ , for example.
- the resistance value of the first pull-up resistor 411A is larger than the pull-up resistor 931 of the conventional waveform potential adjusting means 930! /, If it is a resistance value! /, It may be a deviation value.
- This pull-up resistor 411A is connected between the connection point of the DDC input / output unit 911 and the gate switch means 920 and the 5V reference power supply Vcc.
- the second waveform adjusting means 412 includes, for example, a second pull-up resistor 412A of 10 k ⁇ and connection state switching means 412B that also functions as signal waveform adjustment control means.
- the series circuit of the second pull-up resistor 412A and the connection state switching means 412B is composed of a first pull-up resistor 411 A between the connection point of the DDC input / output unit 911 and the gate switch means 920 and the 5V reference power supply Vcc. Connected in parallel.
- the resistance value of the second pull-up resistor 412A may be any value such that the combined resistance value with the first pull-up resistor 411A becomes a resistance value conforming to the HDMI standard.
- the resistance value of the second pull-up resistor 412A is set so that the combined resistance value is 1.8 k ⁇ , which is the same as that of the pull-up resistor 211A of the reproducing device 200.
- the connection state switching means 412B is connected to a connection point Q different from the connection point to which the second pull-up resistor 412A between the DDC input / output unit 911 and the gate switch means 920 is connected. Further, the connection state switching means 412B is grounded. Then, the connection state switching means 412B connects the second pull-up resistor 412A to the reference power source Vcc when the potential at the connection point Q becomes, for example, 1.5V between 1.5V and 3.5V. .
- the second pull-up resistor 412A is connected to the reference power supply Vcc when the potential at the connection point Q is between 1.5V and 3.5V.
- the potential at the connection point Q when connecting the second pull-up resistor 412A to the reference power supply Vcc is the timing of the rising and falling of the signal waveform, the high level and low level thresholds at the connection point of the CPU430
- the connection state switching means 412B is appropriately set to other values depending on the characteristics of the high level and low level thresholds.
- the resistance value of the pull-up resistor 411 A is set to a larger value! /
- the resistance value of the pull-up resistor 412A is set to a smaller value
- the combined resistance value is 1.8 k Q. If set to be, the intermediate potential of the signal waveform will be lower. Therefore, connect the second pull-up resistor 412A to the reference power supply Vcc when the potential at the connection point Q is less than 1.5V, which corresponds to the low level of the signal waveform, and the combined resistance value conforms to the HDMI standard. 1.
- the intermediate potential cannot be lowered after 8 kQ.
- the second pull-up resistor 412A is not connected to the reference power supply Vcc and the combined resistance value does not comply with the HDMI standard. Therefore, the combined resistance value at the high level deviates from the HDMI standard value of 1.5 to 2. OkQ force. For this reason, the rise and fall characteristics of the signal waveform, for example, the current value flowing through the pull-up resistor 412A is different from 1.8 k ⁇ , and the time to reach the specified threshold value is delayed, affecting DDC communication. Sometimes. From these facts, when the potential at the connection point Q becomes a predetermined potential between 1.5V and 3.5V, the second bullup resistor 412A is connected to the reference power source Vcc.
- the state in which the second pull-up resistor 412A is connected to the reference power source Vcc is the state in which the second waveform adjusting unit 412 is turned on, and the state in which the second waveform adjusting unit 412 is not connected is The state of being turned off will be referred to as appropriate.
- the setting table storage area of the memory 420 stores a DDC communication setting table having DDC communication setting information (not shown) provided with communication setting name information 21A and SCL speed information 21B.
- this DDC communication setting table has only DDC communication setting information corresponding to the DDC communication setting information 21 of the setting of the above embodiment (2K-1) (K is a natural number of 1 to N), for example.
- the CPU 430 includes a communication target switching unit 431, a device authentication processing unit 252, a communication setting changing unit 253, an output control unit 254, and the like.
- the communication target switching means 431 recognizes that DDC communication is to be performed, it sends the control signal to the gate switch.
- the control signal is not output to the gate switch means 920.
- the communication target switching means 431 performs the gate switch means 920. To enable DDC communication. After this, the processing of steps S102 and S103 is performed until CPU 430i, and then DDC communication is performed in step S104.
- the second waveform adjusting means 412 is turned off when the potential at the connection point Q during DDC communication is less than 1.5V, and turned on when the potential is 1.5V or higher. Thereafter, the CPU 430 performs the processing from step S105 to step S115 shown in FIG.
- the CPU 430 of the playback device 400 can change the SCL speed by changing the SCL speed when the cause of the DDC communication failure is the influence of the SCL or SDA communication timing. Can be recognized correctly. Therefore, the playback device 400 can improve the SDA communication.
- the second waveform adjustment means 412 is turned off when the potential at the connection point Q is less than 1.5V corresponding to the rising or falling edge of the signal waveform, and does not correspond to the rising or falling edge. Turned on in the above case.
- the combined resistance value of each pull-up resistor 411A, 41 2A is not compliant with the HDMI standard when it corresponds to the rising edge of the signal waveform when the second waveform adjustment means 412 is turned off.
- the playback device 400 can improve the SDA communication even when the cause of the failure of the DDC communication is the influence of the intermediate potential of the signal waveform.
- the combined resistance value of the pull-up resistors 411A and 412A becomes a resistance value that conforms to the HDMI standard when the second waveform adjusting means 412 is turned on, and a resistance value that does not comply when the second waveform adjusting means 412 is turned off.
- the resistance of each of the pull-up resistors 411A and 412A is not limited to this, and the resistance value of the pull-up resistors 411A and 412A is in a state where the resistance value is not compliant when turned on and becomes the compliant value when turned off. It can also be configured to set resistance values.
- a waveform potential adjusting means as a signal waveform adjusting means as shown in FIG. It is good also as a structure provided with 510.
- FIG. The waveform potential adjusting means 510 includes a pull-up resistor 511 configured by a variable resistor. This pull-up resistor 511 is connected between the DDC dedicated connection point or the DDC connection point and the 5 V reference power supply Vcc. Further, the pull-up resistor 511 is provided in a state in which the resistance value is continuously variable, for example, under the control of the pull-up connection control means 251.
- the resistance value of the pull-up resistor 511 may be set to a predetermined value.
- the resistance value setting pattern of the pull-up resistor 511 for adjusting the signal waveform can be increased as compared with the reproducing devices 200 and 300. Therefore, as compared with the playback devices 200 and 300, it is possible to cope with a greater number of patterns of DDC communication failure causes.
- the number of pull-up resistors provided in comparison with the reproducing devices 200 and 300 can be reduced.
- a waveform potential adjusting means 520 as a signal waveform adjusting means as shown in FIG. It is good also as a structure provided with.
- This waveform potential adjusting means 520 includes 1.5 k Q, 2. OkQ, 2.5 k Q, 3. Ok Q,... Pull-up resistors 521A, 521B, 521C, 521D,. It has.
- the series circuit of the pull-up resistor 521 A and the connection state switching means 522 is connected between the DDC dedicated connection point or the DDC connection point and the 5 V reference power supply Vcc. Further, the pull-up resistors 521B, 521C, 521D,...
- connection state switching unit 522 connects, for example, one of the pull-up resistors 521A, 521B, 521C, 521D,... To the DDC dedicated connection point or the DDC connection point under the control of the pull-up connection control unit 251. . Then, when recognizing that DDC communication is impossible, select one of the pull-up resistors 521A, 521B, 521C, 521 D,... As a DDC dedicated connection point or DDC connection point. It may be configured to be connected. With this configuration, the waveform potential adjustment procedure for adjusting the signal waveform is performed.
- the setting pattern of the resistance value of the stage 520 can be increased as compared with the playback devices 200 and 300. Therefore, compared to the playback devices 200 and 300, it is possible to deal with the failure causes of more patterns of DDC communication. Further, since only one connection state switching unit 522 is provided, the number of connection state switching units provided can be reduced as compared with the playback devices 200 and 300.
- a waveform potential adjusting means 530 as a signal waveform adjusting means as shown in FIG. It is good also as a structure provided with.
- the waveform potential adjusting unit 530 includes a pull-up resistor 211A, a pull-up resistor 212A, and a connection state switching unit 531.
- the series circuit of the pull-up resistor 211A and the connection state switching means 531 is connected between the DDC dedicated connection point or the DDC connection point and the 5V reference power supply Vcc.
- the pull-up resistor 212A is connected in parallel with the bull-up resistor 211A between the 5V reference power supply Vcc and the connection state switching means 531.
- the connection state switching means 531 is provided, for example, in a state in which one of the pull-up resistors 211A and 212A is connected to the DDC dedicated connection point or the DDC connection point under the control of the bullup connection control means 251. Yes. Then, when it is recognized that DDC communication is impossible, it is possible to selectively connect one of the pull-up resistors 211A and 212A to the DDC dedicated connection point or DDC connection point. . With such a configuration, only one connection state switching means 531 needs to be provided, so that the number of connection state switching means provided can be reduced as compared with the playback devices 200 and 300.
- waveform potential adjusting means 510, 520, 530 in the embodiment shown in FIG. 7, the embodiment shown in FIG. 8, and the embodiment shown in FIG. 9 are replaced with the waveform potential adjusting means 410 shown in FIG. It's also possible to use a configuration instead of!
- the resistance value of the pull-up resistor 211A of the HDMI waveform adjusting unit 211 is set to a value that conforms to the HDMI standard
- the resistance value of the pull-up resistor 212A of the DVI waveform adjusting unit 212 is set to a value that does not comply with the HDMI standard.
- the configuration to be set is exemplified, the present invention is not limited to this, and the following configuration may be used. That is, the resistance value of the pull-up resistor 211 A is a value that conforms to the HDMI standard, and the combined resistance value of the pull-up resistor 212A and the pull-up resistor 211 A is a value that does not conform to the HDMI standard. Configure to set the value May be.
- the resistance value of the pull-up resistor 212A is set to a value that does not conform to the HDMI standard, and the value of the pull-up resistor 211A is set to a value that the combined resistance value with the pull-up resistor 212A conforms to the HDMI standard. It is good also as a structure to set.
- the combined resistance value of the pull-up resistors 211A and 212A is a value that conforms to the HDMI standard by simply outputting a control signal only to the pull-up resistor 212A or the pull-up resistor 211A. Or it can be set to a non-compliant value.
- the resistance value of the pull-up resistor 212A may be set to a value that is at least larger than the resistance value of the pull-up resistor 211A. Also, from the viewpoint of communication timing of fc communication, the resistance value of the pull-up resistor 212A may be different from the pull-up resistor 211A.
- the device authentication processing unit 252 functions as the communication target specifying information acquisition unit of the present invention, and for example, the EDID of the output device 800 functions as the communication target specifying information of the present invention, respectively. It is good also as a structure which implements a process. That is, the communication setting changing unit 253 recognizes that the output device 800 is compatible with the HDMI standard or the DVI standard based on, for example, EDID acquired by the device authentication processing unit 252. Then, the communication setting may be set so that the respective waveform adjusting units 211 and 212 corresponding to the recognized standard are turned on. With such a configuration, the signal waveform can be adjusted to a state based on the standard supported by the output device 800, and the number of times of changing the communication setting can be minimized. Therefore, SDA communication can be further improved.
- the configuration provided with the waveform potential adjusting means 210 for adjusting the potential of the signal waveform has been exemplified, but the present invention is not limited to this, and any configuration for adjusting the signal waveform is possible. You may apply.
- the waveform potential adjusting means of the present invention the configuration in which the waveform potential adjusting means 210 provided with the pull-up resistors 211A and 212A and the connection state switching means 211B and 212B is illustrated, but the present invention is not limited thereto, Adjust the potential V, and apply the misalignment configuration.
- the first communication setting is set in accordance with the HDMI standard.
- the HDMI waveform adjustment means 211 with the pull-up resistor 211 A is turned on, and the SCL speed recommended by the HDMI standard is shown as an example.
- the first communication setting is not limited to this. It is good also as a structure set to a state. Even in such a configuration, even if the cause of the failure of DDC communication is the influence of the intermediate potential of the signal waveform or the influence of the communication timing, SDA can be recognized correctly and SDA communication can be improved.
- the circuit control in the waveform potential adjusting means 210, 410 and the current adjusting means 310 may be performed only during transmission / reception of either one of SDA and SCL.
- the configuration may be implemented only when SDA is transmitted and received.
- communication speed adjustment a configuration that implements both SDA and SCL is desirable.
- the following configuration may be used. That is, for example, the communication setting changing unit 253 sets the port for outputting the control signal and the SCL speed based on a predetermined condition.
- a condition for setting a port for outputting a control signal for example, a port is changed every time it is determined that DDC communication is impossible, or the number of times it is determined to be impossible is a predetermined number of times. However, it is not limited to changing the port when it becomes.
- the conditions for setting the SCL speed include, for example, increasing / decreasing the SCL speed by a predetermined speed every time it is determined that DDC communication is impossible, or the number of times it is determined to be impossible is a predetermined number of times However, it is not limited to changing the SCL speed.
- the pull-up connection control means 251 and the device authentication processing means 252 may be configured to perform various controls based on the set various items. With this configuration, it is not necessary to store the DDC communication setting table 20 in the memory 240. Therefore, the amount of information stored in the memory 240 can be reduced.
- step S105 determines that the DDC communication is successful in step S105
- step S107 the same processing as in step S112 is performed to determine whether or not the failed DDC communication is the setting (2N) DDC communication power.
- step S115 is performed. For this reason, the process of step S106, step S109 thru
- a signal electrical characteristic recognition means for recognizing a potential or current corresponding to the signal waveform.
- the communication setting changing means 253 may determine whether or not DDC communication is possible based on the potential and current recognized by the signal electrical characteristic recognition means. With such a configuration, it is possible to recognize the intermediate potential, communication timing, and the like based on the potential and current of the signal waveform recognized by the signal electrical characteristic recognition means. Therefore, the communication setting change means 253 can identify the cause of failure of the DDC communication. In addition, if the communication setting is set based on the specified cause of failure, the number of times the communication setting is changed can be minimized.
- the communication setting changing means 253 controls the signal waveform to be adjusted by the pull-up connection control means 251, and the device authentication processing means 252 controls to change the SCL speed.
- a configuration may be adopted in which only one of the force V and the deviation is controlled. For example, if only the control for changing the SCL speed is performed by the communication setting changing means 253 of the CPU 250 shown in FIG. 2, the pull-up connection control means 251 need not be provided. Furthermore, it is not necessary to provide at least one of the waveform adjusting means 211 and 212. Further, if only the control for adjusting the signal waveform is performed, it is not necessary to provide a function for changing the SCL speed of the device authentication processing means 252. Therefore, the configuration of the playback device 200 can be simplified.
- the communication setting changing means 253 determines that DDC communication is impossible, either one of control for adjusting the signal waveform and control for changing the SCL speed is performed.
- the configuration for changing the communication setting to the state to be implemented has been illustrated, but the configuration is not limited to this, and the following configuration may be used. That is, when it is determined that DDC communication is impossible, the communication setting may be changed so that both control for adjusting the signal waveform and control for changing the SCL speed are always performed.
- the communication setting change pattern can be reduced as compared with the configuration of the above embodiment, and the number of DDC communication setting information 21 stored in the DDC communication setting table 20 can be reduced. Therefore, the amount of information stored in the memory 240 can be reduced.
- the communication setting in which the DDC communication is successful is stored in the memory 240 together with the EDID of the output device 800, for example. Further, when recognizing that a new output device 800 is connected to the playback device 200, the communication setting corresponding to the EDID of this output device 800 is retrieved from the memory 240. Then, when the search is successful, DDC communication is performed with the retrieved communication settings, and when the search is not successful, the DDC communication process shown in Fig. 4 is performed. With such a configuration, it is possible to succeed in DDC communication once without performing the DDC communication processing as shown in FIG. 4 when the output device 800 is connected for the second time and thereafter. Therefore, the playback device 200 can improve DDC communication. If the communication settings corresponding to the plurality of output devices 800 are stored in the memory 240, the playback device 200 can improve the DDC communication with respect to the plurality of output devices 800.
- a configuration similar to the current adjusting unit 310 may be applied.
- the control unit 850 controls the same configuration as that of the current adjustment unit 310 to determine the resistance value of the pull-up resistor 824 during communication between the playback device 300 and the EEPROM 830, and the playback device 300 and the DVIZHDMI receiver.
- the configuration may be adjusted so that it becomes larger than when communicating with the 840. With this configuration, the current flowing through the pull-up resistor 824 during communication with the EEPROM 830 can be reduced as compared with the communication with the DVIZHDMI Resino 840.
- the intermediate potential of the acknowledge during communication with the EEPROM 830 can be lowered.
- the timing of the signal waveform during EDID communication can be changed. Therefore, DDC communication can be improved.
- a configuration for adjusting the resistance value of the pull-up resistor 823 of the transmission / reception adjusting means 820 provided in the output device 800 a configuration similar to that of the waveform potential adjusting means 410 may be applied. With this configuration, for example, during communication with the DVIZHDMI receiver 840 and communication with the EEPROM 830, the current flowing through the pull-up resistor 823 corresponding to the low level of the signal waveform can be reduced. it can. Therefore, DDC communication can be further improved.
- the circuit of the waveform potential adjusting means 210 can be similarly applied to the output device 800.
- the resistors 211A and 212A may be any values as long as they are different from each other. Since the register values for HDCP and EDID communication are determined, if the playback device 200 sends register values regarding whether the DVI / HDMI receiver 840 and the EEPROM 830 communicate with each other. In response to this, the control unit 850 on the output device 800 side performs control so that one of the resistors 211A and 212A is selected.
- the present invention is not limited to this.
- the present invention may be applied to various devices. In other words, recording / playback devices that record content such as video and music on a recording medium such as a DVD, HD, Blu-ray disc, or memory, and play back recorded content, recording devices that perform recording only, and playback only You may apply to the reproducing
- a so-called set-top box that connects to a television device or the like to provide an additional function
- a recording device or recording / reproducing device that supports the D—VHS (Data Video Home System) system
- an AV (Audio Visual) amplifier
- a DV It may also be applied to a so-called camcorder, which is a digital VTR (Videotape Recorder) integrated camera such as Digital Video) or DVD recorder.
- the present invention may be applied to a television tuner, a personal computer, a game machine, a navigation device that supports movement of a moving object, and a storage server.
- the present invention may be applied to a configuration that performs various types of communication other than I 2 C communication.
- the CPU 250 of the playback device 200 causes the communication setting changing unit 253 to appropriately store the communication setting for DDC communication in the setting storage area of the memory 240.
- the pull-up connection control means 251 controls the waveform potential adjusting means 210 to adjust the SDA signal waveform during DDC communication based on the communication settings stored in the setting storage area. Thereafter, when the communication setting changing unit 253 determines that DDC communication based on the communication setting stored in the setting storage area is impossible based on the communication failure signal from the device authentication processing unit 252, the setting storage unit 253 Change the communication settings stored in the area. Based on the changed communication setting, the pull-up connection control unit 251 controls the waveform potential adjustment unit 210 to adjust the SDA signal waveform during DDC communication.
- the playback device 200 lowers the intermediate potential of this signal waveform by causing the pull-up connection control means 251 to adjust the SDA signal waveform, such as an ack, in the waveform potential adjustment unit 210. Can do. Therefore, for example, when the cause of the failure of DDC communication with the output device 800 corresponding to the DVI standard is that the SDA cannot be correctly recognized by the intermediate potential of the signal waveform, the playback device 200 uses the pull-up connection control means 251. SDA can be correctly recognized by adjusting the signal waveform of SDA by control. Therefore, the playback device 200 can improve the SDA communication.
- the CPU 250 of the playback device 200 performs DDC communication processing at the SCL speed based on the communication setting stored in the setting storage area in the device authentication processing means 252. Thereafter, when the communication setting changing unit 253 determines that DDC communication based on the communication setting stored in the setting storage area is impossible based on the communication failure signal from the device authentication processing unit 252, the communication setting changing unit 253 stores the setting in the setting storage area. Change the stored communication settings. And device authentication processing means The 252 performs DDC communication processing at the SCL speed based on this changed communication setting!
- playback apparatus 200 can change the communication timing of SCL and SDA by changing the SCL speed in device authentication processing means 252. Therefore, when the cause of the failure of the DDC communication is the communication timing corresponding to the rising or falling state of the signal waveform of SCL or SDA, the playback device 200 uses the device authentication processing means 252 to change the SCL speed. SDA can be recognized correctly. Therefore, the playback device 200 can improve the SDA communication.
- the present invention can be used for a communication state control device, a communication control device, a communication processing device, and a communication state control method for controlling the data communication state.
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Abstract
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JP2008109219A (ja) * | 2006-10-23 | 2008-05-08 | Funai Electric Co Ltd | テレビジョンおよびedid書換回路 |
US7523241B2 (en) | 2006-06-06 | 2009-04-21 | Onkyo Corporation | Hot-plug signal detecting apparatus, source device and repeater device |
US8073311B2 (en) | 2006-08-22 | 2011-12-06 | Funai Electric Co., Ltd. | Moving image reproducing apparatus |
EP2538668A3 (en) * | 2011-05-24 | 2013-02-06 | Samsung Electronics Co., Ltd. | Source device for providing contents to sink device and communication method thereof |
JP2016163092A (ja) * | 2015-02-27 | 2016-09-05 | 株式会社アイ・ディ・ケイ | 接続障害回復モジュール、障害回復機能を備えた機器およびプログラム |
US10782760B2 (en) | 2017-05-31 | 2020-09-22 | Canon Kabushiki Kaisha | Electronic device and method of controlling the same |
WO2023013822A1 (ko) * | 2021-08-03 | 2023-02-09 | 삼성전자주식회사 | 전자 장치 및 그 영상 처리 방법 |
US11942019B2 (en) | 2021-08-03 | 2024-03-26 | Samsung Electronics Co., Ltd. | Electronic apparatus and image processing method thereof for processing EDID information |
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US7523241B2 (en) | 2006-06-06 | 2009-04-21 | Onkyo Corporation | Hot-plug signal detecting apparatus, source device and repeater device |
US8073311B2 (en) | 2006-08-22 | 2011-12-06 | Funai Electric Co., Ltd. | Moving image reproducing apparatus |
JP2008109219A (ja) * | 2006-10-23 | 2008-05-08 | Funai Electric Co Ltd | テレビジョンおよびedid書換回路 |
EP2538668A3 (en) * | 2011-05-24 | 2013-02-06 | Samsung Electronics Co., Ltd. | Source device for providing contents to sink device and communication method thereof |
US9832420B2 (en) | 2011-05-24 | 2017-11-28 | Samsung Electronics Co., Ltd. | Source device for providing contents to sink device and communication method thereof |
JP2016163092A (ja) * | 2015-02-27 | 2016-09-05 | 株式会社アイ・ディ・ケイ | 接続障害回復モジュール、障害回復機能を備えた機器およびプログラム |
US10782760B2 (en) | 2017-05-31 | 2020-09-22 | Canon Kabushiki Kaisha | Electronic device and method of controlling the same |
WO2023013822A1 (ko) * | 2021-08-03 | 2023-02-09 | 삼성전자주식회사 | 전자 장치 및 그 영상 처리 방법 |
US11942019B2 (en) | 2021-08-03 | 2024-03-26 | Samsung Electronics Co., Ltd. | Electronic apparatus and image processing method thereof for processing EDID information |
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