54 results about "Transition-minimized differential signaling" patented technology

Digital Visual Interface (DVI), or High Definition Multi-media Interface (HDMI), data is received from a source and sent to a transmitter chip that includes a transition minimized differential signaling (TMDS) receiver that outputs a 3-data and 1-clock physical signaling stream representing the DVI or HDMI data. This stream is rendered into I and Q data by an ASIC or FPGA and sent to a wireless transmitter for modulation, upconverting, and transmission to, e.g., a nearby display device without ever rendering the data into baseband video on the transmitter chip. The display device has a receiver chip that is essentially the inverse of the transmitter chip.

A display apparatus and a power control method thereof are provided. The display apparatus includes a power supplying part; a Transition Minimized Differential Signaling (TMDS) receiving part which decodes a TMDS signal input from an external signal source; a controller which controls the power supplying part to supply driving power to the TMDS receiving part when a clock signal of the TMDS signal is received. The power control method includes cutting off driving power to a Transition Minimized Differential Signaling (TMDS) receiving part when the display apparatus enters a power-saving mode; determining whether a clock signal is detected in a TMDS signal; and supplying driving power to the TMDS receiving part if it is determined that the clock signal is detected.

An embodiment includes encoding digital data into encoded digital data in a transition minimized differential signaling encoder, serializing the encoded digital data into encoded and serial digital data in a serializer, generating test data in a pseudo-random binary sequence generator circuit, transmitting the encoded and serial digital data through a multiplexer to a transmission medium in a normal mode of operation, and transmitting the test data through the multiplexer to the transmission medium in a test mode of operation. The encoder, the serializer, the sequence generator circuit, and the multiplexer may be fabricated in a single integrated circuit chip. The test data may be pseudo-random binary sequence data. The digital data may include data to generate colors in a visual image, and the encoded and serial digital data may be received, deserialized, decoded, and displayed in a display unit.

A differential serial communication transmitter (i.e. PCI Express or other suitable type of transmitter) can be used to transport and interoperate transition minimized differential signaling. The differential serial communication transmitter control logic receives display configuration control data and in response configures at least one differential serial communication transmitter of a plurality of differential serial communication transmitters in an integrated circuit for communication with a display (i.e. visual digital display) employing transition minimized differential signaling. For example, the integrated circuit, such as a graphics processor, may include the plurality of differential serial communication transmitters for communication with devices, such as a northbridge circuit and a display within a computer system. The differential serial communication transmitter control logic may configure at least one of the plurality of differential serial communication transmitters for communication with the display via a differential serial communication display link (i.e. DVI or other suitable type of link). The plurality of differential serial communication transmitters may also be configured for communication with one or more other devices, such as with a bridge circuit such as a northbridge.

The invention relates to a long-distance nondestructive fiber transmission device of a high-definition multimedia interface (HDMI), which consists of a transmitting module, a receiving module and five fibers. The transmitting module is connected with the receiving module through the five fibers, the transmitting module is connected with a display source by cables, and the receiving module is connected with a display terminal by cables, wherein three fibers transmit a high-speed video / audio signal of a transition minimized differential signaling (TMDS), one fiber transmits a clock signal and one fiber transmits a DDC control signal. In the invention, the realization principle is as follows: four paths of optical signals transmit a high-definition signal, one path of optical signal transmits a display data channel signal read from the display terminal, and transmits back to the display source terminal, thereby completely replacing the copper cables in the cables with five fibers. The HDMI of the invention is transmitted by the five fibers, and has the advantages of high bandwidth, longer transmission distance, low cost and the like.

A method and apparatus for transmitting / receiving multimedia data are disclosed. The method for transmitting / receiving multimedia data includes the steps of generating a High Definition Multimedia Interface (HDMI)-type data of 4-bits, encoding the 4-bits HDMI-type data into 10-bits TERC4 (Transition-Minimized Differential Signaling Error Reduction Coding-4) encoded values, converting the 10-bits TERC4 encoded values into 8-bits DVI (Digital Video Interface)-type data, transmitting the 8-bits DVI-type data, receiving the 8-bits DVI-type data, converting the received 8-bits DVI-type data into 10-bits TERC4 encoded values, decoding the 10-bits TERC4 encoded values into 4-bits HDMI-type data, and receiving the decoded HDMI-type data.

The invention discloses an apparatus, method and system for connecting High-Definition Multimedia Interface (HDMI) devices. A loopback device connects between a first source device and a sink device on a first connection; a second source device connects to the sink device on a second connection. The loopback device manages the first connection, passes transition-minimized differential signaling (TMDS) or fixed-rate link (FRL) signals through to the sink device, and outputs audio received from the sink device on the audio return channel (ARC) or enhanced audio return channel (eARC). In this manner, audio that originates from any source device may be output without requiring a direct connection to the loopback device.

A moving image reproducing apparatus that can produce appropriate information concerning the occurrence of a communication error in the DDC includes an error detecting unit that detects a communication error in a display data channel (DDC); an error information generating unit that generates error information if a communication error in the DDC is detected by the error detecting unit; and an error information output unit that delivers the error information to the display device via a transition minimized differential signaling (TMDS) channel.

An audio / video transmission apparatus includes a hot plug detecting section for detecting a hot plug signal output from a reception apparatus connected thereto via an High Definition Multimedia Interface (HDMI), an EDID reading / determining section for determining Extended Display Identification Data (EDID) information of the reception apparatus, a type determining section for determining a type of the reception apparatus based on a result of the determination of the EDID information, a TMDS switching section for designating an output scheme corresponding to the type of the reception apparatus of a plurality of Transition Minimized Differential Signaling (TMDS) signal output schemes; and a TMDS output section for outputting a TMDS signal in accordance with the designated output scheme.

The invention relates to an anti-peep display system for a microcomputer system. The anti-peep display system comprises a display card of a microcomputer, a TMDS (Transition Minimized Differential Signaling) data receiving and decoding circuit, a T' trigger, controllable liquid crystal eyeglasses, a driving circuit of a data signal and a control signal, a TMDS data encoding and transmitting circuit and a display, wherein the display card of the microcomputer is connected with the TMDS data receiving and decoding circuit; the TMDS data receiving and decoding circuit is connected with the driving circuit of the data signal and the control signal; the input end of the T' trigger is connected with the TMDS data receiving and decoding circuit; the output end of the T' trigger is connected withthe driving circuit of the data signal and the control signal; the controllable liquid crystal eyeglasses are controlled by the output end of the T' trigger synchronously; the TMDS data encoding and transmitting circuit is connected with the driving circuit of the data signal and the control signal; and the display is connected with the TMDS data encoding and transmitting circuit. According to the anti-peep display system, contents on the display can only be seen by people who operate the microcomputer and an application system thereof, and other people cannot see, so that the anti-peep problem of the microcomputer system is solved.

A transmitter of a transition minimized differential signaling (TMDS) system includes a current source, a pair of switches configured to be connected to the current source and switch a current of the current source, and a monitoring unit configured to monitor a potential of a connection node between the current source and the pair of switches. The pair of switches is connected to a receiver of the TMDS system through a first line and a second line, respectively. The monitoring unit monitors the potential of the connection node based on a power supply voltage applied to the receiver and current switching of the pair of switches.

The present invention provides a video switch and a switching method thereof. The video switch comprises a first input port configured to transmit a first Transition Minimized Differential Signaling (TMDS) and a first Inter-Integrated Circuit (I2C) signal; a second input port configured to transmit a second Transition Minimized Differential Signaling (TMDS) and a second Inter-Integrated Circuit (I2C) signal; a first switch unit and a second switch unit. When switching the first input port to the second input port, the video switch firstly outputs the second Inter-Integrated Circuit (I2C) signal a specific time and then outputs the second Transition Minimized Differential Signaling (TMDS).

A transmitter of a transition minimized differential signaling (TMDS) system includes a current source, a pair of switches configured to be connected to the current source and switch a current of the current source, and a monitoring unit configured to monitor a potential of a connection node between the current source and the pair of switches. The pair of switches is connected to a receiver of the TMDS system through a first line and a second line, respectively. The monitoring unit monitors the potential of the connection node based on a power supply voltage applied to the receiver and current switching of the pair of switches.

The invention discloses a local area network intercommunication method, and the method comprises the steps: employing a TMDS (Transition Minimized Differential Signaling) protocol of an HDMI, transmitting file information which is converted into an image format to a video collection card in the other local area network through the HDMI, obtaining a digital signal of an image through the video collection card, analyzing the image information into an original file through a data processing module, and obtaining the transmitted data. The method can achieve the intercommunication of two independent local area networks, provides a channel of information communication for two PCs at different network segments, does not employ the Internet for communication, and avoids the possibility of data leakage and PC invasion. The method employs the TMDS protocol for transmission of data, and improves the data transmission stability.

The invention provides a digital video interface data recovery circuit, which comprises a charge pump phase-locked loop, an oversampler and a data recovery unit; the charge pump phase-locked loop receives TMDS (Transition Minimized Differential Signaling) clock input and generates 20-phase clock output two times higher than TMDS clock frequency; the oversampler samples the inputted high-speed serial TMDS data signals; and the data recovery unit recovers raw digital video data according to the 40-bit parallel data outputted by the oversampler. The digital video interface data recovery circuit provided by the invention can solve the problem that the digital phase-locked loop in the prior art is not stable enough, and the error rate of data transmission is decreased.

A method and apparatus for transmitting / receiving multimedia data are disclosed. The method for transmitting / receiving multimedia data includes the steps of generating a High Definition Multimedia Interface (HDMI)-type data of 4-bits, encoding the 4-bits HDMI-type data into 10-bits TERC4 (Transition-Minimized Differential Signaling Error Reduction Coding-4) encoded values, converting the 10-bits TERC4 encoded values into 8-bits DVI (Digital Video Interface)—type data, transmitting the 8-bits DVI-type data, receiving the 8-bits DVI-type data, converting the received 8-bits DVI-type data into 10-bits TERC4 encoded values, decoding the 10-bits TERC4 encoded values into 4-bits HDMI-type data, and receiving the decoded HDMI-type data.

The present disclosure is related to a hardware component for communications over a multimedia communication interface. In one embodiment, a hardware component includes a disparity circuit that stores a disparity value. The disparity value indicates the disparity between the number of “1”s and the number of “0”s previously transmitted by the hardware component. The hardware component also includes circuitry for receiving multimedia data to be scrambled, encoded and transmitted by the hardware component. In one embodiment, the multimedia data includes video data and data island data. In one embodiment, the hardware component generates transition minimized intermediate codes based on values in the guard band data included within the video data and data island data. The hardware component generates encoded guard band codes that are transition minimized as well as direct current balanced. The hardware component transmits the encoded guard band codes over a differential pair of the multimedia communication device.

A method of transmitting data through a link comprises encoding digital data into encoded digital data in a transition minimized differential signaling encoder, serializing the encoded digital data into encoded and serial digital data in a serializer, generating test data in a pseudo-random binary sequence generator circuit, transmitting the encoded and serial digital data through a multiplexer to a transmission medium in a normal mode of operation, and transmitting the test data through the multiplexer to the transmission medium in a test mode of operation. The encoder, the serializer, the sequence generator circuit, and the multiplexer are fabricated in a single integrated chip. The test data includes data to generate colors in a visual image, and the encoded and serial digital data is received, deserialized, decoded, and displayed in a display unit.

The invention relates to an HDMI (high definition multimedia interface) high-speed signal testing clamp and a testing method. The HDMI high-speed signal testing clamp comprises the design of an HDMI male head, a TMDS (transition minimized differential signaling) high-speed signal head joint pull-up and impedance control module and a low-speed signal module, when an HDMI high-speed signal of source end equipment is tested, the HDMI male head of the testing clamp is inserted into an HDMI female socket of the source end equipment, the HDMI high-speed signal is tested by a universal high-bandwidth point measurement probe or a welding probe at an exposed TMDS routing tail end of the clamp, so that the testing cost is greatly lowered, operations are simple and convenient, and great convenience is brought for the testing.

The invention discloses a V-BY-ONE signal conversion method, a V-BY-ONE signal conversion device and electronic equipment. The method comprises the steps that at least two signal processors receive minimized transmission differential signals output by an HDMI signal source in the same clock domain respectively, and each signal processor receives at least one path of minimized transmission differential signals and analyzes the minimized transmission differential signals to obtain corresponding effective pixel data and a data clock; the data clock generated by each signal processor are respectively reconfigured to obtain a VBO data clock; the effective pixel data generated by each signal processor is converted into corresponding VBO pixel data according to the VBO data clock; the VBO pixel data generated by each signal processor is converted into multi-channel point screen data. According to the invention, clock recovery from high-speed signals is not needed, the function realization issimpler, and the development difficulty is reduced; a clock line does not need to be added, the integration degree is higher, the structure is simpler, and system stability is improved.

The invention provides a signal detection method of a minimum transmission differential signal transmission system and a device thereof, which are used for the minimum transmission differential signal transmission system. A passage of the system is arranged between a receiver and a transmitter. The signal detection method comprises the following steps: disconnecting the electric connection between a load in the receiver and the passage; providing a first reference current in a first differential circuit of the passage; providing a second reference current in a second differential circuit of the passage; calculating a difference value between the first reference current and the current derived by the transmitter through the first differential circuit to obtain a first current difference value; calculating a difference value between the second reference current and the current derived by the transmitter through the second differential circuit to obtain a second current difference value; performing low-pass filtering operation to a first node voltage and a second node voltage so as to generate a low-pass operation result; and judging the operation state of the transmitter according to the low-pass operation result; wherein the first node voltage corresponds to the first current difference value and the second node voltage corresponds to the second current difference value.

The invention discloses a TMDS (transition minimized differential signaling) bidirectional transmission system of a signal. The TMDS bidirectional transmission system of the signal comprises a master control MCU (micro controller unit), an HDMI (high definition multimedia interface) signal interface A, an HDMI signal interface B, a TMDS switch drive circuit A where the TMDS signal can be input through the HDMI signal interface A and output through the HDMI signal interface B, a TMDS switch drive circuit B where the TMDS signal can be input through the HDMI signal interface B and output through the HDMI signal interface A and a TMDS bidirectional transmission circuit. The TMDS bidirectional transmission system of the signal can achieve transmission of the signal from the HDMI signal interface A to the HDMI signal interface B and further can achieve transmission of the signal from the HDMI signal interface B to the HDMI signal interface A through drive switches provided by the TMDS switch drive circuit A and the TMDS switch drive circuit B, achieves bidirectional transmission on a unified channel, saves a large space, and can further reduce unnecessary resource waste.

A moving image reproducing apparatus that can produce appropriate information concerning the occurrence of a communication error in the DDC includes an error detecting unit that detects a communication error in a display data channel (DDC); an error information generating unit that generates error information if a communication error in the DDC is detected by the error detecting unit; and an error information output unit that delivers the error information to the display device via a transition minimized differential signaling (TMDS) channel.

The invention discloses a mobile terminal with an HDMI (High-Definition Multimedia Interface), which comprises an HDMI communication module, wherein the HDMI communication module further comprises a Bluetooth module, a processor, an HDMI emitter and an HDMI connector, wherein the Bluetooth module is used for receiving a control command sent by an external control device; the processor is used for receiving the control command transmitted by the Bluetooth module and processing an audio / video data according to the control command; the HDMI emitter is used for receiving the audio / video data processed by the processor and converting the audio / video data into a TMDS (Transition Minimized Differential Signaling) data; and the HDMI connector is used for receiving the TMDS data and transmitting the TMDS data to an externally connected display device. The invention also provides a control device, a system and a control method. The Bluetooth communication between the control device and the mobile terminal with the HDMI and a control module are utilized to finish the control on the mobile terminal with the HDMI, thereby realizing the remote operation for the mobile terminal with the HDMI.

A display apparatus and a power control method thereof are provided. The display apparatus includes a power supplying part; a Transition Minimized Differential Signaling (TMDS) receiving part which decodes a TMDS signal input from an external signal source; a controller which controls the power supplying part to supply driving power to the TMDS receiving part when a clock signal of the TMDS signal is received. The power control method includes cutting off driving power to a Transition Minimized Differential Signaling (TMDS) receiving part when the display apparatus enters a power-saving mode; determining whether a clock signal is detected in a TMDS signal; and supplying driving power to the TMDS receiving part if it is determined that the clock signal is detected.

The invention discloses a minimum transmission differential signal receiver system and a built-in self testing method thereof. The system comprises a clock channel, multiple data channels, a minimum transmission differential signal decoding unit and a self testing unit, wherein the clock channel receives and outputs a clock signal, each data channel receives, processes and outputs a corresponding data signal according to the clock signal; the minimum transmission differential signal decoding unit receives the data signal after processing, and can decode the data signal after the processing; and the self testing unit receives the clock signal and an external parallel signal, generates a test signal according to the clock signal and the external parallel signal, and can perform built-in self testing on the data channels and the minimum transmission differential signal decoding unit. In addition, the built-in self testing method which is suitable for the minimum transmission differential signal receiver system is provided.

The invention discloses high-resolution remote video transmitting and encoding equipment, which is characterized by comprising a video acquisition instruction decoding circuit, a scaling circuit, a transition minimized differential signaling (TMDS) acquisition and high-definition multimedia interface (HDMI) / digital video interface (DVI) conversion circuit, a microprogrammed control unit (MCU) control circuit and more than one RS485-to-RS232 conversion circuit, wherein the integrated output port of the video acquisition instruction decoding circuit is connected with the integrated input port of the scaling circuit; the integrated output port of the scaling circuit is connected with the integrated input port of the TMDS acquisition and HDMI / DVI conversion circuit with the RS485-to-RS232 conversion circuit; the integrated output port of the TMDS acquisition and HDMI / DVI conversion circuit with the RS485-to-RS232 conversion circuit is connected with an RS485 and HDMI / DVI signal integrated input port of the RS485-to-RS232 conversion circuit through a cable; the control output of the MCU control circuit is connected with control inputs of the video acquisition instruction decoding circuit, the scaling circuit and the TMDS acquisition and HDMI / DVI conversion circuit with the RS485-to-RS232 conversion circuit; and if the number of the RS485-to-RS232 conversion circuits is more than two, each RS485-to-RS232 conversion circuit is connected in series with the cable through the RS485 and HDMI / DVI signal integrated output port and the RS485 and HDMI / DVI signal integrated input port. Compared with the prior art, the high-resolution remote video transmitting and encoding equipment has the advantages of multi-group video transmission, remote transmission and convenience in use and control.