Video optical transmitter with loop-out and bidirectional audio

Abstract

The utility model relates to the technical field of audio and video signal source transmission equipment, and discloses a video optical transmitter with loop-out and bidirectional audio, which comprises a transmitting end and a receiving end. The sending end obtains and compresses the signal, converts the signal into an optical pulse, and transmits the optical pulse through a single optical fiber; and the receiving end converts the optical pulse back to an electric signal and is responsible for signal decoding and port distribution. Compared with the prior art, the utility model has the advantages that the high-speed optical fiber transmission technology is adopted, the signal transmission without compression, loss and delay can be realized, the ultra-clear 4K60Hz resolution ratio is supported, the transmission distance is long, and the high-speed optical fiber transmission device can be applied to various high-definition long-distance transmission occasions. The HDMI optical fiber transmitter is signal transmission equipment with high performance and high reliability, and can meet the requirements of various application occasions. Due to the adoption of the optical fiber transmission technology, the transmission distance is very stable and is not influenced by the distance, and the stability and the reliability of signal transmission are ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of audio and video signal source transmission equipment, in particular to a video optical transmitter with loop-out and two-way audio. Background Art

[0002] In today's digital age, traditional analog transmission methods struggle to address challenges such as signal loss, electromagnetic interference, and ground interference. Digital audio and video offer far superior performance compared to analog, making the digitization of broadcast and television equipment an inevitable trend. The advantages of digital signal transmission and processing are its insensitivity to interference, and the overall system's signal-to-noise ratio and distortion are independent of transmission distance. For long-distance transmission, its superior performance is unmatched by analog transmission.

[0003] HDMI is becoming increasingly common in connecting digital entertainment, information transmission, and multimedia devices. Digital consumer demand for professional audio and video signal transmission is also becoming increasingly urgent. The real-time transmission of video images and audio is becoming increasingly important in various applications.

[0004] Audio and video signals are played back on the same platform, meaning that audio signals must be transmitted synchronously with the video signal. Therefore, the solution of transmitting audio and video signals across multiple devices is not cost-effective and resource-intensive, and is also not conducive to product upgrades and maintenance. HDMI, a fully digital video and audio transmission interface, enables the transmission of uncompressed audio and video signals in real time. It utilizes digital signal transmission to simultaneously transmit audio and video data at high speeds from source devices (such as TVs, game consoles, and computers) to display devices (such as LCD TVs and monitors), resulting in clear, high-quality images and sound.

[0005] Before the introduction of optical fiber, copper cables were widely used due to their low cost (though optical fiber transmission is cheaper than copper cables for long-distance transmission). However, copper cables without compensation (weighted amplification) increasingly exhibited shortcomings, including short transmission distances, poor confidentiality, susceptibility to electromagnetic interference, and high maintenance costs. Since the advent of optical fiber, its application has rapidly expanded, becoming the preferred choice for both long- and short-distance transmission (over 1500 / 1800 meters). Optical transmission and communication technology plays an increasingly important role in the development of information technology in today's society.

[0006] In existing situations where high-quality audio and video signals need to be transmitted, HDMI audio and video and external audio signals cannot be transmitted over long distances, and the quality of signal transmission cannot be guaranteed.

[0007] In response to the above technical problems, the present application proposes a video optical transmitter with loop-through and two-way audio. Summary of the Invention

[0008] (1) Technical problems solved

[0009] The technical problem to be solved by the present invention is that in situations where high-quality audio and video signals need to be transmitted, HDMI audio and video and external audio signals cannot be transmitted over long distances, and the quality of signal transmission cannot be guaranteed.

[0010] (2) Technical solution

[0011] In order to solve the above technical problems, the technical solution provided by the present invention is as follows: a video optical transmitter with loop-out and two-way audio, comprising a transmitting end and a receiving end;

[0012] The transmitting end acquires and compresses the signal, and converts the signal into an optical pulse for transmission via a single optical fiber;

[0013] The receiving end converts the optical pulses back into electrical signals and is responsible for signal decoding and port allocation;

[0014] The electrical signal path between the transmitting end and the receiving end includes: an HDMI distributor, an HDMI repeater, an Ethernet serializer circuit, a CWDM photoelectric conversion module, an EDID learning circuit, an MCU module, a transmission channel detection indicator module and a power supply module.

[0015] As an improvement, the input channel of the optical transmitter adopts a video 1:2 distributor, which receives an HDMI data stream and decodes the input into two HDMI transmitters, complying with the HDMI2.0 / HDMI1.4 specifications, with a maximum high-speed data rate of 6Gbps for the channel. The device has adaptive equalization and pre-emphasis functions, and the mixed-signal design circuit includes a phase-locked loop and an equalization filter to remove input data jitter. The clock channel provides a high-performance PLL that regenerates a low-jitter output clock for data recovery.

[0016] As an improvement, the HDMI repeater chip circuit includes a transmitter and receiver, an inter-integrated circuit (I2C), a serial peripheral interface (SPI), and an enhanced microprocessor. This video processing repeater chip performs signal replication, adjustment, and amplification, retiming, and regenerating the complete digital signal for transmission, thereby extending signal transmission. Due to signal loss, the signal power gradually decreases along the transmission line. When this attenuation reaches a certain level, it causes signal distortion, leading to reception errors. When the system speed increases to above 6Gbit per channel, HDMI signals can be significantly distorted in PCB traces, connectors, and HDMI transmission lines. The HDMI repeater is a regenerator with HDMI signal jitter removal capabilities. It removes frequency jitter and phase differences in HDMI 2.0 signals, significantly improving signal quality and supporting input and output video resolutions up to 4K x 2K @ 60 Hz.

[0017] As an improvement, the port-compatible protocol of the HDMI repeater transmits 4K video and built-in audio, and external independent input analog audio signals through a single optical fiber, and the receiver can freely choose to de-embed audio or independent audio input and output.

[0018] As an improvement, the optical transmitter has a built-in high-end single-chip microcomputer MCU to initialize the video processing chip, EDID management and video interface processing, complete system function settings and status detection, and allow the working status of the device to be displayed and presented to the outside in real time.

[0019] As an improvement, the optical transmitter adopts high-speed optical fiber transmission technology.

[0020] (3) Beneficial effects

[0021] The advantages of this utility model over existing technologies are: the video loop-out and two-way audio optical transmitter is a very practical signal transmission device that can help users transmit high-definition video signals and transmit and de-embed audio signals. The device uses high-speed fiber optic transmission technology to achieve uncompressed, lossless, and delay-free signal transmission. It also supports ultra-high-definition 4K60Hz resolution and has a long transmission distance, making it suitable for various high-definition long-distance transmission applications.

[0022] The HDMI fiber optic transmitter is a high-performance, highly reliable signal transmission device that can meet the needs of various applications. Due to the use of fiber optic transmission technology, the transmission distance is very stable and is not affected by distance, ensuring the stability and reliability of signal transmission. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a principle block diagram of the optical transmitter of the utility model.

[0024] Figure 2 This is a principle block diagram of the optical transmitter receiver of the present utility model.

[0025] Figure 3 This is a test access block diagram of the utility model.

[0026] Figure 4 This is a one-way transmission diagram of analog audio in the present invention. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0028] As attached Figure 1 and attached Figure 2 As shown, a video optical transmitter with loop-through and two-way audio includes a transmitting end and a receiving end;

[0029] The transmitting end acquires and compresses the signal, and converts the signal into an optical pulse for transmission via a single optical fiber;

[0030] The receiving end converts the optical pulses back into electrical signals and is responsible for signal decoding and port allocation;

[0031] The electrical signal path between the transmitting end and the receiving end includes: an HDMI distributor, an HDMI repeater, an Ethernet serializer circuit, a CWDM photoelectric conversion module, an EDID learning circuit, an MCU module, a transmission channel detection indicator module and a power supply module.

[0032] The input channel of the optical transmitter adopts a video 1:2 splitter, which receives an HDMI data stream and decodes the input into two HDMI transmitters. It complies with the HDMI2.0 / HDMI1.4 specifications and has a maximum high-speed data rate of 6Gbps. The device has adaptive equalization and pre-emphasis functions. The mixed-signal design circuit includes a phase-locked loop and an equalization filter to remove input data jitter. The clock channel provides a high-performance PLL, which regenerates a low-jitter output clock for data recovery.

[0033] The HDMI repeater chip circuitry includes a transmitter and receiver, an inter-integrated circuit (I2C), a serial peripheral interface (SPI), and an enhanced microprocessor. This video processing repeater chip performs signal replication, adjustment, and amplification, retiming, and regenerating the complete digital signal for transmission, thereby extending signal transmission. Due to signal loss, signal power gradually decreases along the transmission line, causing signal distortion and reception errors. When system speeds exceed 6Gbit per channel, HDMI signals can be significantly distorted along PCB traces, connectors, and HDMI transmission lines. The HDMI repeater is a regenerator with HDMI signal jitter removal capabilities. It removes frequency jitter and phase shifts from HDMI 2.0 signals, significantly improving signal quality and supporting input and output video resolutions up to 4K x 2K @ 60 Hz.

[0034] The HDMI repeater's port-compatible protocol transmits 4K video and built-in audio, as well as external independent input analog audio signals, through a single optical fiber, allowing the receiver to freely choose de-embedded audio or independent audio input and output.

[0035] The optical transmitter has a built-in high-end single-chip microcomputer MCU to initialize the video processing chip, EDID management and video interface processing, complete system function settings and status detection, and allow the working status of the device to be displayed and presented to the outside in real time.

[0036] The optical transmitter adopts high-speed optical fiber transmission technology.

[0037] The specific usage is as follows:

[0038] As attached Figure 3 As shown, the transmitter and receiver are connected to their respective devices via optical fiber. The specific connection structure for the test is: the transmitter's HDMI IN port is connected to a PC port or signal source using an HDMI cable, while the receiver's HDMI OUT port is connected to a monitor using an HDMI cable. Similarly, external independent audio and RS232 serial signals are connected to the transmitter (or receiver) input at one end and the receiver's transmitter (or transmitter) output at the other end.

[0039] The transmitter acquires the HDMI signal and loops it out locally, transmits or receives independent audio and RS232 serial signals, and extends the signal transmission via optical fiber. The receiver receives the HDMI signal, transmits or receives independent audio and RS232 serial signals, and switches and outputs the original audio embedded in the video. The product uses LC-terminated single-core optical fiber as the transmission medium, making testing more convenient and faster.

[0040] In practical applications, a transmitter sometimes needs to synchronously transmit local analog audio signals to a remote mixing console. This requires an independent audio transmission channel. In a bidirectional audio optical transmitter, the transmitter and receiver both serve as audio acquisition and output terminals. When connected via optical fiber, a bidirectional audio transmission channel is formed. The receiver sometimes needs to maintain the original sound within the video. In this case, a switch circuit can be used to switch to the repeater de-embedding function channel to maintain the original sound within HDMI. If the external audio signal is required to be restored and output, the switch is switched to the independent audio channel for transmission after digital-to-analog conversion.

[0041] As attached Figure 4 As shown, due to the bidirectional audio requirement of the optical transmitter, the transmitter and receiver of the transmitter have the functions of sending and receiving analog audio signals at the same time.

[0042] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0043] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

[0044] The above description of the present invention and its embodiments is non-limiting. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if a person skilled in the art is inspired by the above, and does not deviate from the purpose of the present invention, without inventive design, a structure and embodiment similar to the technical solution should fall within the scope of protection of the present invention.

Claims

1. A video optical transmitter with loop-through and two-way audio, characterized by: Including the sending end and the receiving end; The transmitting end acquires and compresses the signal, and converts the signal into an optical pulse for transmission via a single optical fiber; The receiving end converts the optical pulses back into electrical signals and is responsible for signal decoding and port allocation; The electrical signal path between the transmitting end and the receiving end includes: an HDMI distributor, an HDMI repeater, an Ethernet serializer circuit, a CWDM photoelectric conversion module, an EDID learning circuit, an MCU module, a transmission channel detection indicator module and a power supply module.

2. The video optical transmitter with loop-through and two-way audio according to claim 1, characterized in that: The input channel of the optical transmitter adopts a video 1:2 splitter, which receives an HDMI data stream and decodes the input to two HDMI transmitters.

3. The video optical transmitter with loop-through and two-way audio according to claim 1, characterized in that: The chip circuit of the HDMI repeater includes a transmitter and a receiver, an internal integrated circuit (I2C), a serial peripheral interface (SPI) and an enhanced microprocessor. It is a video processing repeater chip circuit that completes the signal replication, adjustment and amplification functions, retimes and regenerates the complete digital signal transmission, thereby extending the signal transmission.

4. The video optical transmitter with loop-through and two-way audio according to claim 3, characterized in that: The HDMI repeater's port-compatible protocol transmits 4K video and built-in audio, as well as external independent input analog audio signals, through a single optical fiber, allowing the receiver to freely choose de-embedded audio or independent audio input and output.

5. The video optical transmitter with loop-through and two-way audio according to claim 1, characterized in that: The optical transmitter has a built-in high-end single-chip microcomputer MCU to initialize the video processing chip, EDID management and video interface processing, complete system function settings and status detection, and allow the working status of the device to be displayed and presented to the outside in real time.

6. The video optical transmitter with loop-through and two-way audio according to claim 1, characterized in that: The optical transmitter adopts high-speed optical fiber transmission technology.

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