CN118337945A - Video and audio transmission method and device and rebroadcasting vehicle - Google Patents
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Abstract
The application provides a video and audio transmission method, a device and a rebroadcasting vehicle, wherein the method comprises the following steps: acquiring multiple paths of input signals, and identifying the signal type and the signal rate of each path of input signals in the multiple paths of input signals; performing cable equalization compensation processing on each frequency component of each path of input signal based on the signal type and the signal rate, and performing gain adjustment on each path of input signal after the cable equalization compensation processing based on the signal type and the signal rate; performing clock recovery on each path of input signals after gain adjustment, and multiplexing each path of input signals after clock recovery to obtain a multiplexing signal; the multiplexed signal is converted into an optical signal and the optical signal is transmitted through an optical fiber in the cable, and at the same time, an electrical signal is transmitted through a power line in the cable, wherein the electrical signal is used for providing power for receiving end equipment for receiving the optical signal. The application solves the technical problem of signal attenuation in the video and audio transmission process in the prior art.
Description
Technical Field
The application relates to the technical field of video and audio transmission, in particular to a video and audio transmission method and device and a rebroadcast vehicle.
Background
In the field of modern television broadcasting, efficient transmission and processing of signals is of paramount importance. In the field retransmission process, real-time transmission of field signals and signals in a retransmission vehicle is required to be realized. Conventional signal transmission schemes typically employ a single path transmission, such as independent transmission of video, audio, and network signals. However, this approach has a problem in that the transmission distance is limited. Particularly, with the continuous development of broadcast television technology, attenuation problems in the signal transmission process are increasingly prominent from analog to digital to high definition and 4K, and the transmission distance is further limited.
In order to solve the above problem of limited transmission distance, a method for multiplexing multiple input signals such as video, audio and network signals is proposed in the prior art. However, different types and rates of signals experience different levels of attenuation during transmission, especially over long distances. In addition, this approach faces a problem in that the power is available on site. In particular, in some temporarily built rebroadcasting sites, it is often very difficult to find a power supply.
In view of the above problems, no effective solution has been proposed at present.
Disclosure of Invention
The embodiment of the application provides a video and audio transmission method and device and a rebroadcasting vehicle, which at least solve the technical problem of signal attenuation in the video and audio transmission process in the prior art.
According to an aspect of an embodiment of the present application, there is provided a video and audio transmission method, including: acquiring multiple paths of input signals, and identifying the signal type and the signal rate of each path of input signals in the multiple paths of input signals; performing cable equalization compensation processing on each frequency component of each path of input signal based on the signal type and the signal rate, and performing gain adjustment on each path of input signal after the cable equalization compensation processing based on the signal type and the signal rate; performing clock recovery on each path of input signals after gain adjustment, and multiplexing each path of input signals after clock recovery to obtain a multiplexing signal; and converting the multiplexing signal into an optical signal, transmitting the optical signal through an optical fiber in a cable, and simultaneously transmitting an electric signal through a power line in the cable, wherein the electric signal is used for providing power for receiving end equipment for receiving the optical signal.
According to another aspect of the embodiment of the present application, there is also provided an apparatus for transmitting video and audio, including: an acquisition module configured to acquire multiple input signals and identify a signal type and a signal rate of each of the multiple input signals; the compensation module is configured to perform cable equalization compensation processing on each frequency component of each input signal based on the signal type and the signal rate, and perform gain adjustment on each input signal after the cable equalization compensation processing based on the signal type and the signal rate; the multiplexing module is configured to perform clock recovery on each path of input signals after gain adjustment, and multiplex each path of input signals after clock recovery to obtain a multiplexing signal; and the transmission module is configured to convert the multiplexing signal into an optical signal, transmit the optical signal through an optical fiber in a cable, and simultaneously transmit an electric signal through a power line in the cable, wherein the electric signal is used for providing power for receiving end equipment for receiving the optical signal.
In the embodiment of the application, multiple paths of input signals are acquired, and the signal type and the signal rate of each path of input signals in the multiple paths of input signals are identified; performing cable equalization compensation processing on each frequency component of each path of input signal based on the signal type and the signal rate, and performing gain adjustment on each path of input signal after the cable equalization compensation processing based on the signal type and the signal rate; performing clock recovery on each path of input signals after gain adjustment, and multiplexing each path of input signals after clock recovery to obtain a multiplexing signal; and converting the multiplexing signal into an optical signal, transmitting the optical signal through an optical fiber in a cable, and simultaneously transmitting an electric signal through a power line in the cable, wherein the electric signal is used for providing power for receiving end equipment for receiving the optical signal. By the method, the technical problem of signal attenuation in the transmission process of video and audio between the relay site and the relay vehicle in the prior art is solved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:
fig. 1 is a flowchart of a video and audio transmission method according to an embodiment of the present application;
FIG. 2 is a flow chart of a method of performing compensation processing according to an embodiment of the application;
Fig. 3 is a flowchart of another video and audio transmission method according to an embodiment of the present application;
fig. 4 is a flowchart of a cable equalization compensation process according to an embodiment of the present application;
FIG. 5 is a flow chart of gain adjustment according to an embodiment of the present application;
Fig. 6 is a schematic structural view of an audio and video transmission apparatus according to an embodiment of the present application;
Fig. 7 shows a schematic diagram of an electronic device suitable for use in implementing embodiments of the present disclosure.
Detailed Description
It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The application will be described in detail below with reference to the drawings in connection with embodiments.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present application unless it is specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.
Example 1
The embodiment of the application provides a video and audio transmission method, as shown in fig. 1, which comprises the following steps:
step S102, a plurality of input signals are acquired, and the signal type and the signal rate of each input signal in the plurality of input signals are identified.
Step S104, performing cable equalization compensation processing on each frequency component of each input signal based on the signal type and the signal rate, and performing gain adjustment on each input signal after the cable equalization compensation processing based on the signal type and the signal rate.
In some embodiments, the method of performing the compensation process is shown in fig. 2, and may include the following steps:
step S1042, performing a cable equalization compensation process on each frequency component of the input signal according to the signal type and the signal rate.
1) A weighted attenuation value is calculated.
A weighted attenuation value of the cable for each frequency component of the each input signal is calculated based on the signal type and the signal rate. Specifically, determining a conduction loss and a dielectric loss of the cable based on each frequency component of the each input signal, and calculating a total attenuation value of each frequency component based on the conduction loss and the dielectric loss; a weighting factor for each frequency component is calculated based on the signal type and the signal rate, and the weighted attenuation value for each frequency component is calculated based on the total attenuation value and the weighting factor. Wherein the frequency components are the existence of individual waveforms of various frequencies in the input signal. The input signal may be decomposed by fourier transformation into a superposition of simple sine and cosine waves of a plurality of different frequencies, each frequency of which is the frequency component of the input signal.
The embodiment of the application can accurately compensate the conductive loss and the dielectric loss in the cable by calculating the weighted attenuation value of each frequency component based on the signal type and the signal rate, thereby improving the quality and the reliability of signal transmission. In addition, by calculating the conductive loss and the dielectric loss of each frequency component of each input signal and calculating the weighted attenuation value by combining the signal type and the signal rate, the optimization processing of different signals under various transmission conditions can be realized, and the integrity and the stability of the signals in long-distance transmission are ensured.
In some embodiments, the weighting factors may be obtained using the following method: calculating a type adjustment coefficient based on the signal type, wherein the type adjustment coefficient increases as a frequency component of the video signal increases in the case where the signal type is the video signal; in the case where the signal type is the audio signal, the type adjustment coefficient increases as the frequency component of the audio signal approaches a center frequency; in the case where the signal type is the network signal, the type adjustment coefficient is a preset value (e.g., 1) and the preset value remains unchanged; calculating a rate adjustment coefficient based on the signal rate, wherein the rate adjustment coefficient increases as the signal rate increases; and calculating the weighting factors of the frequency components based on the type adjustment coefficients and the rate adjustment coefficients.
The embodiment can more flexibly adapt to the characteristic requirements of different types of signals (such as video signals, audio signals and network signals) by calculating the adjustment coefficients of the signal types and the signal rates, and realizes the accurate weighted compensation of each frequency component. Specifically, the introduction of the type adjustment coefficient and the rate adjustment coefficient makes it possible to optimize for the high frequency characteristic of the video signal, the center frequency characteristic of the audio signal, and the stability characteristic of the network signal, thereby improving the quality and reliability of various signals in the transmission process.
2) And calculating the cable balance compensation quantity and carrying out cable balance compensation treatment.
And determining the cable equalization compensation quantity of each frequency component based on the weighted attenuation value of each frequency component. For example, the cable equalization compensation amount for each frequency component is determined using an equalizer having a frequency response opposite to cable attenuation based on the weighted attenuation values for each frequency component. Then, the cable equalization compensation processing is performed on each frequency component of the input signal of each path based on the cable equalization compensation amount of each frequency component.
The embodiment can effectively offset the attenuation of different frequency components in the cable transmission process by determining the cable equalization compensation amount based on the weighted attenuation value of each frequency component and performing compensation processing by using the equalizer opposite to the cable attenuation. Thus, the overall quality and stability of signal transmission are improved, and the balance of all frequency components is ensured, so that the quality of the final output signal is obviously improved.
And step S1044, performing gain adjustment on the input signals of each path after the cable equalization compensation processing based on the signal type and the signal rate.
For example, calculating the signal rate ratio of each input signal according to the signal rate and the reference rate; and determining a gain compensation amount based on the signal rate ratio, the signal type and the length of the cable, and performing gain adjustment on each path of input signal after the cable equalization compensation processing based on the gain compensation amount.
The embodiment can accurately adjust the gain of each input signal by calculating the signal rate ratio according to the signal rate and the reference rate and determining the gain compensation amount by combining the signal type and the cable length. The accurate gain adjustment can effectively compensate the signal attenuation after the cable equalization processing, and ensure that each signal can obtain the best transmission quality under the conditions of different rates and types, thereby improving the transmission performance and the signal integrity of the whole system.
Step S106, performing clock recovery on each path of input signals after gain adjustment, and multiplexing each path of input signals after clock recovery to obtain a multiplexing signal;
First, clock recovery is performed. Generating an error signal of each input signal and a local clock signal by comparing the phase difference of each input signal and the local clock signal after gain adjustment; filtering noise with a noise threshold greater than a preset threshold in the error signal through a filter such as a low-pass filter to obtain a smooth error signal, wherein the preset threshold can be in a range from 5 db to 15 db; and adjusting the output frequency of the voltage control oscillator by using the smoothed error signal, and recovering the clock of each input signal after compensation by using the clock signal of the voltage control oscillator. And multiplexing each path of input signals after clock recovery to obtain a multiplexing signal.
The clock recovery step can effectively eliminate clock deviation caused by signal transmission, and ensures the synchronism and stability of each path of input signals. Noise is filtered through a low-pass filter, a smooth error signal is generated, and the output frequency is adjusted by using a voltage-controlled oscillator, so that the clock of the signal is accurately recovered. Then, the signals after clock recovery are multiplexed, so that a synchronous and high-quality multiplexing signal can be generated, and the reliability and the transmission effect of the whole transmission system are ensured.
Step S108, converting the multiplexed signal into an optical signal, and transmitting the optical signal through an optical fiber in a cable, and simultaneously transmitting an electrical signal through a power line in the cable, where the electrical signal is used to provide power for a receiving end device that receives the optical signal.
The video and audio transmission method provided by the embodiment of the application solves the communication difficulty between the live broadcast site and the rebroadcasting vehicle. Conventional transmission schemes are limited by transmission distance and signal attenuation, and these problems become more pronounced, especially as broadcast television technology continues to evolve, from analog to digital to high definition and 4K signals. The application adopts photoelectric conversion technology to compensate video, audio and network signals and then convert the video, audio and network signals into optical signals for transmission, thereby effectively reducing signal attenuation and prolonging transmission distance. Meanwhile, in order to solve the power supply problem of the field device, the embodiment of the application provides a direct current power supply scheme, and the field device is powered by arranging a power line in the camera composite cable, so that the live broadcast field does not need to be independently powered, and the rebroadcasting vehicle can provide direct current for the field device (such as a receiving end device for receiving optical signals, a field camera and other devices) through the cable.
Example 2
The embodiment of the application provides another video and audio transmission method which is mainly applied to a signal transmission box and is used for bidirectional signal transmission between a rebroadcasting vehicle and live field equipment. As shown in fig. 3, the method comprises the steps of:
in step S302, the signal type and the signal rate of the input signal are acquired.
A plurality of input signals are first acquired and a signal type and a signal rate of each of the plurality of input signals are identified, wherein the signal type includes a video signal, an audio signal, and a network signal.
Step S304, performing a cable equalization compensation process based on the signal type and the signal rate.
As shown in fig. 4, the cable equalization compensation process includes the steps of:
In step S3042, a total attenuation value is calculated.
First, each frequency component of each input signal needs to be determined and extracted. Each input signal may be decomposed into different frequency components by signal processing techniques such as fourier transforms or wavelet transforms. Then, for each frequency component, the conduction loss of the cable is calculated. The conduction loss is caused by the resistance of the cable, the magnitude of which depends on the signal frequency and the resistive properties of the cable material. In some embodiments, the electrical resistance parameter of the cable and the signal frequency may be used to calculate the conduction loss. Next, the dielectric loss is calculated for each frequency component. Dielectric loss is caused by the dielectric properties of the cable insulation, mainly due to energy loss caused by friction and polarization effects of molecules inside the cable. The dielectric loss increases with increasing signal frequency and can therefore be calculated from the signal frequency and the dielectric properties of the cable material. Finally, the total attenuation value of each frequency component can be obtained by adding the conduction loss and the dielectric loss.
In step S3044, a weighting factor is calculated.
1) And calculating a type adjustment coefficient.
For different types of signals, a type adjustment coefficient is calculated. The type adjustment coefficient is determined according to the signal type, which is classified into a video signal, an audio signal, and a network signal. For the video signal, as the frequency component increases, the type adjustment coefficient correspondingly increases so as to better adapt to the high-frequency characteristic of the video signal; for the audio signal, the type adjustment coefficient is increased according to the frequency component approaching to the center frequency of the frequency component so as to better adapt to the characteristics of the audio signal; for the network signal, a preset value, for example, 1, may be used as the type adjustment coefficient because the characteristics of the network signal are relatively stable.
2) A rate adjustment coefficient is calculated.
A rate adjustment coefficient is calculated based on the signal rate. The rate adjustment factor increases with increasing signal rate because as signal rate increases, the bandwidth required for signal transmission increases, and thus a greater rate adjustment factor is required to accommodate this change.
3) A weighting factor is calculated.
The weighting factor is calculated based on the type adjustment coefficient and the rate adjustment coefficient. The weighting factor may be calculated by a linear combination method, i.e. adding the type adjustment coefficient and the rate adjustment coefficient according to a preset ratio, for example (6:4 or 7:3), to obtain the final weighting factor. This allows a comprehensive consideration of the influence of signal type and signal rate on signal attenuation, thereby more accurately assessing the quality of signal transmission.
In this embodiment, the weighting factor can help to adjust the total attenuation value, so that the total attenuation value better reflects the actual attenuation condition of different types of signals in cable transmission, and provides an accurate reference basis for the subsequent cable equalization compensation process. Through the steps, the weighting factors of different types of signals can be accurately calculated, so that the quality and the reliability of signal transmission are improved.
And step S3046, calculating the cable balance compensation amount and performing cable balance compensation.
For each frequency component of each input signal, the total attenuation value is multiplied by a corresponding weighting factor to obtain a weighted attenuation value. Then, the cable equalization compensation amount of each frequency component is determined based on the weighted attenuation value of each frequency component. Specifically, the equalizer parameters are determined from the weighted attenuation values using an equalizer design that is opposite to the cable attenuation to achieve compensation for each frequency component. And carrying out cable balance compensation processing on each frequency component of each path of input signal by using the determined cable balance compensation quantity. By adjusting the amplitude and phase of the signal, the compensation processing of the input signal is realized, so as to improve the transmission quality and reliability.
Step S306, gain adjustment is performed based on the signal type and the signal rate.
As shown in fig. 5, performing gain adjustment includes the steps of:
in step S3062, a signal rate ratio of each input signal is calculated.
The signal rate ratio of each input signal may be calculated by dividing the signal rate by the reference rate. The signal rate refers to the rate of the signal in the transmission process, and the reference rate is the standard rate preset by the system. The deviation of the actual signal rate relative to the reference rate can be known by calculating the signal rate ratio.
In an audio-visual transmission system, reference rates for different signal types are different. For example, for video signals, the reference rate of standard definition video Signal (SD) may be 270 Mbps, high definition video signal (HD) may be 1.485 Gbps, and ultra high definition signal (4K) may be 12 Gbps. For audio signals, the reference rate for digital audio signals may be 1.411 Mbps and the high resolution audio signal may be 3.072 Mbps. For network signals, the reference rate for ethernet (standard ethernet) may be 100 Mbps, 1Gbps for gigabit ethernet and 10 Gbps for teraethernet.
Step S3064, determining the gain compensation amount based on the signal rate ratio, the signal type and the cable length.
The video signal requires a larger amount of gain compensation to maintain transmission quality, while the audio signal requires a smaller amount of adjustment. Cable length is also an important factor affecting the amount of gain compensation, as longer cables can result in more severe signal attenuation. Thus, the gain compensation amount may be calculated by the product of the signal rate ratio, the adjustment factor determined based on the signal type, and the normalized value of the cable length. In some embodiments, the adjustment factor of the standard definition video signal may be 0.5, the high definition video signal is 1.0, and the ultra high definition video signal is 2.0. The adjustment factor of the digital audio signal is low, 0.2, and the high resolution audio signal is 0.4. For network signals, the adjustment factor of the standard Ethernet is 0.1, the gigabit Ethernet is 0.5, and the tera Ethernet is 1.0.
Step S3066, gain adjustment is carried out on each path of input signal after the cable equalization compensation processing according to the determined gain compensation quantity.
Gain adjustment may be achieved by increasing or decreasing the amplitude of the input signal so that the power of the signal remains at a suitable level during transmission. Such gain adjustment can effectively compensate for signal attenuation due to attenuation during cable transmission, thereby ensuring that each input signal can achieve optimal transmission quality under different rate and type conditions.
By the implementation method, the signal can be accurately gain-adjusted according to actual conditions, so that the quality and reliability of signal transmission are improved, and the integrity and stability of the signal in the long-distance transmission process are ensured.
In step S308, clock recovery is performed.
First, each input signal after gain adjustment is compared with a local clock signal to calculate a phase difference therebetween. The phase difference refers to the time offset between each input signal and the local clock signal, which can be calculated by comparing their periods or frequencies. An error signal is then generated. And generating an error signal between each path of input signal and the local clock signal according to the calculated result of the phase difference. The error signal indicates an offset of each input signal relative to the local clock signal, positive values indicate that each input signal is advanced relative to the local clock signal, and negative values indicate that each input signal is retarded relative to the local clock signal.
Subsequently, noise is filtered out by a low pass filter. The error signal is input to a low pass filter to filter out noise therein. The low pass filter is capable of removing noise signals having frequencies above a preset threshold and retaining signals having frequencies below the preset threshold. This results in a smooth error signal, effectively reducing interference from noise.
Then, the output frequency of the voltage controlled oscillator is adjusted. The smoothed error signal is used to adjust the output frequency of a Voltage Controlled Oscillator (VCO). The output frequency of the VCO is controlled by the input voltage signal. By adjusting the output frequency of the VCO, an adjustment of the clock signal may be achieved. When the error signal is positive, increasing the output frequency of the VCO; when the error signal is negative, the output frequency of the VCO is reduced.
Finally, the compensated clock is recovered using the clock signal of the VCO. And applying the clock signal adjusted by the VCO to each path of input signal to realize clock recovery compensation. The output frequency of the VCO is adjusted to synchronize the clock signal of each input signal with the local clock signal, thereby implementing clock recovery compensation for each input signal.
Step S310, multiplexing and transmitting the multiplexed signal.
And integrating each path of input signals after clock recovery into a composite signal, and transmitting the composite signal through a cable. Multiplexing may be done in a predetermined order or priority to ensure proper combination of the different input signals. Multiplexing is a prior art and is not described in detail herein.
The embodiment of the application designs a structure of a two-core optical fiber and a two-core power line in the cable. The two-core optical fiber is responsible for realizing bidirectional video and audio signal transmission, so that video and audio signals can be transmitted back and forth between a transmitting end and a receiving end at high speed and reliability. In addition, two-core power wires in the cable are used for providing 48V power supply. In this way, the problem of power supply of the field devices can be solved, and in particular in a rebroadcast site built temporarily, it is often difficult to find a stable power supply. Through the power line, the rebroadcasting vehicle can directly provide stable 48V direct current for the field device, thereby avoiding the trouble of independently supplying power on site. Therefore, on-site wiring and power management are simplified, continuous and stable operation of equipment is ensured, and reliability and usability of the whole system are improved.
Example 3
The embodiment of the application provides a video and audio transmission device which is used for video and audio transmission between field equipment and a rebroadcasting vehicle. As shown in fig. 6, the transmission apparatus includes: an acquisition module 62 configured to acquire multiple input signals and identify a signal type and a signal rate of each of the multiple input signals; a compensation module 64 configured to perform cable equalization compensation processing on each frequency component of the input signals of each path based on the signal type and the signal rate, and perform gain adjustment on the input signals of each path after the cable equalization compensation processing based on the signal type and the signal rate; the multiplexing module 66 is configured to perform clock recovery on the input signals with the gain adjusted, and multiplex the input signals with the clock recovered to obtain a multiplexed signal; a transmission module 68 configured to convert the multiplexed signal into an optical signal and transmit the optical signal through an optical fiber in a cable, and simultaneously transmit an electrical signal through a power line in the cable, wherein the electrical signal is used to provide power to a receiving end device that receives the optical signal.
It should be noted that: the transmission device provided in the above embodiment is only exemplified by the division of the above functional modules, and in practical application, the above functional allocation may be performed by different functional modules according to needs, that is, the internal structure of the device is divided into different functional modules, so as to perform all or part of the functions described above. In addition, the transmission device and the transmission method provided in the foregoing embodiments belong to the same concept, and detailed implementation processes of the transmission device and the transmission method are shown in the method embodiments, which are not described herein.
Example 4
The embodiment of the application also provides a rebroadcasting vehicle, which comprises a vehicle head and a carriage body, wherein the inside of the carriage body is sequentially provided with the following components in the front-rear direction from the vehicle head to the carriage body: an audio zone, a director zone, a technical zone and a core device zone; the device corresponding to the director zone is used for full-range switching and video processing; the equipment corresponding to the technical area is used for video regulation and control; the core device area is used for accommodating core devices of the rebroadcasting vehicle, and the core devices comprise a signal interface box which is a video and audio transmission device.
Example 5
Fig. 7 shows a schematic diagram of an electronic device suitable for use in implementing embodiments of the present disclosure. It should be noted that the electronic device shown in fig. 7 is only an example, and should not impose any limitation on the functions and the application scope of the embodiments of the present disclosure.
As shown in fig. 7, the electronic device includes a Central Processing Unit (CPU) 1001 that can execute various appropriate actions and processes according to a program stored in a Read Only Memory (ROM) 1002 or a program loaded from a storage section 1008 into a Random Access Memory (RAM) 1003. In the RAM 1003, various programs and data required for system operation are also stored. The CPU1001, ROM 1002, and RAM 1003 are connected to each other by a bus 1004. An input/output (I/O) interface 1005 is also connected to bus 1004.
The following components are connected to the I/O interface 1005: an input section 1006 including a keyboard, a mouse, and the like; an output portion 1007 including a Cathode Ray Tube (CRT), a Liquid Crystal Display (LCD), etc., and a speaker, etc.; a storage portion 1008 including a hard disk or the like; and a communication section 1009 including a network interface card such as a LAN card, a modem, or the like. The communication section 1009 performs communication processing via a network such as the internet. The drive 1010 is also connected to the I/O interface 1005 as needed. A removable medium 1011, such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, or the like, is installed as needed in the drive 1010, so that a computer program read out therefrom is installed as needed in the storage section 1008.
In particular, according to embodiments of the present disclosure, the processes described below with reference to flowcharts may be implemented as computer software programs. For example, embodiments of the present disclosure include a computer program product comprising a computer program embodied on a computer readable medium, the computer program comprising program code for performing the method shown in the flowcharts. In such an embodiment, the computer program may be downloaded and installed from a network via the communication portion 1009, and/or installed from the removable medium 1011. When being executed by a Central Processing Unit (CPU) 1001, performs the various functions defined in the method and apparatus of the present application. In some embodiments, the electronic device may further include an AI (ARTIFICIAL INTELLIGENCE ) processor for processing computing operations related to machine learning.
It should be noted that the computer readable medium shown in the present disclosure may be a computer readable signal medium or a computer readable storage medium, or any combination of the two. The computer readable storage medium can be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or a combination of any of the foregoing. More specific examples of the computer-readable storage medium may include, but are not limited to: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In the context of this disclosure, a computer-readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device. In the present disclosure, however, the computer-readable signal medium may include a data signal propagated in baseband or as part of a carrier wave, with the computer-readable program code embodied therein. Such a propagated data signal may take any of a variety of forms, including, but not limited to, electro-magnetic, optical, or any suitable combination of the foregoing. A computer readable signal medium may also be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device. Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to: wireless, wire, fiber optic cable, RF, etc., or any suitable combination of the foregoing.
The flowcharts and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present disclosure. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams or flowchart illustration, and combinations of blocks in the block diagrams or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
The units involved in the embodiments of the present disclosure may be implemented by means of software, or may be implemented by means of hardware, and the described units may also be provided in a processor. Wherein the names of the units do not constitute a limitation of the units themselves in some cases.
As another aspect, the present application also provides a computer-readable medium that may be contained in the electronic device described in the above embodiment; or may exist alone without being incorporated into the electronic device.
The computer-readable medium carries one or more programs which, when executed by one of the electronic devices, cause the electronic device to implement the methods described in the embodiments below. For example, the electronic device may implement the steps of the method embodiments described above, and so on.
The foregoing is merely a preferred embodiment of the present application and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present application, which are intended to be comprehended within the scope of the present application.
Claims (10)
1. A transmission method of video and audio, comprising:
acquiring multiple paths of input signals, and identifying the signal type and the signal rate of each path of input signals in the multiple paths of input signals;
performing cable equalization compensation processing on each frequency component of each path of input signal based on the signal type and the signal rate, and performing gain adjustment on each path of input signal after the cable equalization compensation processing based on the signal type and the signal rate;
performing clock recovery on each path of input signals after gain adjustment, and multiplexing each path of input signals after clock recovery to obtain a multiplexing signal;
and converting the multiplexing signal into an optical signal, transmitting the optical signal through an optical fiber in a cable, and simultaneously transmitting an electric signal through a power line in the cable, wherein the electric signal is used for providing power for receiving end equipment for receiving the optical signal.
2. The method of claim 1, wherein performing cable equalization compensation processing on each frequency component of each input signal based on the signal type and the signal rate comprises:
calculating a weighted attenuation value of the cable for each frequency component of the input signal based on the signal type and the signal rate, and determining a cable equalization compensation amount for each frequency component based on the weighted attenuation value of each frequency component;
and carrying out the cable balance compensation processing on each frequency component of each path of input signal based on the cable balance compensation quantity of each frequency component.
3. The method of claim 2, wherein calculating a weighted attenuation value for each frequency component of the input signal for the cable based on the signal type and the signal rate comprises:
Determining the conductive loss and the dielectric loss of the cable based on the frequency components of each input signal, and calculating the total attenuation value of the frequency components based on the conductive loss and the dielectric loss;
A weighting factor for each frequency component is calculated based on the signal type and the signal rate, and the weighted attenuation value for each frequency component is calculated based on the total attenuation value and the weighting factor.
4. A method according to claim 3, wherein determining the cable equalization compensation amount for each frequency component based on the weighted attenuation values for each frequency component comprises: the cable equalization compensation amount for each frequency component is determined using an equalizer having a frequency response opposite to cable attenuation based on the weighted attenuation values for each frequency component.
5. A method according to claim 3, wherein the signal types include: video signals, audio signals, and network signals.
6. The method of claim 5, wherein calculating the weighting factors for the frequency components based on the signal type and the signal rate comprises:
Calculating a type adjustment coefficient based on the signal type, wherein the type adjustment coefficient increases as a frequency component of the video signal increases in the case where the signal type is the video signal; in the case where the signal type is the audio signal, the type adjustment coefficient increases as the frequency component of the audio signal approaches a center frequency; under the condition that the signal type is the network signal, the type adjustment coefficient is a preset value;
Calculating a rate adjustment coefficient based on the signal rate, wherein the rate adjustment coefficient increases as the signal rate increases;
and calculating the weighting factors of the frequency components based on the type adjustment coefficients and the rate adjustment coefficients.
7. The method of claim 1, wherein performing gain adjustment on the cable equalization compensated input signals based on the signal type and the signal rate comprises:
calculating the signal rate ratio of each path of input signals according to the signal rate and the reference rate;
And determining a gain compensation amount based on the signal rate ratio, the signal type and the length of the cable, and performing gain adjustment on each path of input signal after the cable equalization compensation processing based on the gain compensation amount.
8. The method of claim 1, wherein clock recovery of the gain-adjusted input signals comprises:
Generating an error signal of each input signal and a local clock signal by comparing the phase difference of each input signal and the local clock signal after gain adjustment;
Filtering noise with noise threshold larger than a preset threshold in the error signal through a filter to obtain a smooth error signal;
and adjusting the output frequency of the voltage control oscillator by using the smoothed error signal, and recovering the clock of each input signal after gain adjustment by using the clock signal of the voltage control oscillator.
9. A transmission apparatus for video and audio, comprising:
an acquisition module configured to acquire multiple input signals and identify a signal type and a signal rate of each of the multiple input signals;
The compensation module is configured to perform cable equalization compensation processing on each frequency component of each input signal based on the signal type and the signal rate, and perform gain adjustment on each input signal after the cable equalization compensation processing based on the signal type and the signal rate;
The multiplexing module is configured to perform clock recovery on each path of input signals after gain adjustment, and multiplex each path of input signals after clock recovery to obtain a multiplexing signal;
And the transmission module is configured to convert the multiplexing signal into an optical signal, transmit the optical signal through an optical fiber in a cable, and simultaneously transmit an electric signal through a power line in the cable, wherein the electric signal is used for providing power for receiving end equipment for receiving the optical signal.
10. A rebroadster comprising a transmission device according to claim 9.
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