CN103139553A - Device of multimedia signal transmission and conversion and system thereof - Google Patents
Device of multimedia signal transmission and conversion and system thereof Download PDFInfo
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Abstract
The invention discloses a device of multimedia signal transmission and conversion and a system thereof and belongs to the technical field of sound signal transmissions. The device of the multimedia signal transmission and conversion and the method thereof are characterized in that the device comprises a signal input end, a main processor, a signal output end and a register, wherein the signal input end is used for receiving multimedia signals. The main processor is responsible for conducting conversion processing on the multimedia signals which come from the signal input end in a converted mode. The signal output end is used for identifying and outputting the multimedia signals which are processed and converted by the main processor. The register is mainly used for storing the multimedia signals which are received by the signal input end and the multimedia signals which are converted by the main processor. The device of the multimedia signal transmission and conversion and the system thereof have the advantages that interconversion among various video modes is achieved and the device of the multimedia signal transmission and conversion and the method thereof are convenient and rapid to use.
Description
Technical field
The present invention relates to the video/audio signal transmission technique field, especially relate to a kind of comprehensive height, SD is looked the audio frequency multi-media signal in equipment and the system thereof of optical fiber and transmission over coaxial cable and conversion.
Background technology
Digital video-audio system and digital TV in high resolution System Development were very fast in recent years, progressively began to popularize.On market, existing a large amount of SD system is using, and continues to bring out out again the high-definition digital system of various different systems.This analogue system and digital system and deposit, SD system and high definition system and the market structure of depositing, to looking audio transmission system, Secretary has been proposed.Original transmission equipment only supports SD to look the transmission of audio frequency basically, although and new transmission equipment some can support the high-definition digital interface, interface type is single, function is limited, uses underaction.
For the situation that adapts to Vehicles Collected from Market video/audio signal multiple types multiple interfaces and deposit, be necessary to develop a kind of comprehensive height, SD and look the transmission of audio frequency multi-media signal and converting system.
Summary of the invention
The present invention is to provide a kind of comprehensive height, SD to look the audio frequency multi-media signal in equipment and the system thereof of optical fiber and transmission over coaxial cable and conversion for solving the problems of the technologies described above.
Technical problem solved by the invention realizes by the following technical solutions:
A kind of transmission of multi-media signal and the equipment of conversion is characterized in that, this equipment comprises:
One signal input part, this signal input part is used for multimedia signal receiving;
One primary processor, described primary processor are responsible for the multi-media signal from described signal input part is carried out conversion process;
One signal output part, this signal output part are used for the multi-media signal after described primary processor conversion process is identified output;
One register, described register are mainly used in the multi-media signal of described signal input part reception and the multi-media signal after described primary processor conversion process are stored.
Described signal input part comprises SDI light signal input interface, SDI signal of telecommunication input interface, analog video signal input interface and webmaster signal input interface.
Described signal output part comprises SDI light signal output interface, SDI electrical signal output interface and analog video signal output interface.
A kind of transmission of multi-media signal and the system of conversion is characterized in that, comprising:
The signal input module that is used for multimedia signal receiving;
Communicating by letter with described signal input module is connected, and responsible conversion process is from the main processor modules of described signal input module multi-media signal;
Communicating by letter with described main processor modules is connected, and for the signal output module that the multi-media signal after described main processor modules conversion process is exported;
And communicate by letter with described main processor modules and be connected, be used for the register module that the multi-media signal with after described main processor modules conversion process that described signal input module receives is stored.
Described main processor modules comprises, SDI receiver module, audio frequency input module, Video Decoder input module, HDMI receiver module, auxiliary data input module, test patterns generation module, database path module, SDI sending module, audio frequency output module, video encoder output module, HDMI sending module, auxiliary data output module.
Described SDI receiver module in order to realize that 5 bit serial data of LVDS vision signal are converted to 20 bit parallel data, comprises the following steps,
A. carry out described vision signal descrambling according to the scrambler generator polynomial G2 (x) of SDI=x+1 and G1 (x)=x9+x4+1;
B. search for the TRS in serial data, serial data stream is converted to the parallel data stream of 20 bit widths;
C. detect speed, the resolution of SDI;
D.CRC and EDH detect;
E. auxiliary data de-embedding;
F. audio frequency de-embedding.
Described audio frequency input module is in order to the data of the I2S of audio reception or AES form and be converted to AES formatted data stream.
Described Video Decoder input module, the video signal data that is converted to 20 bits in order to the vision signal with the outside input flows.
Described HDMI receiver module in order to the HDMI data are carried out the conversion of clock zone, is synchronized on the system clock territory, and then according to field synchronization, vertical synchronization and the horizontal synchronization inputted, data stream is carried out Reseal, change TRS, be changed to the parallel data stream of 20 bit widths.
Described test patterns generation module, in order to produce simple test signal commonly used and the digitized sine wave audio frequency of frequency, the default 1kHz of frequency is for the testing audio function.
Described datapath module, realization are carried out the function of route handoff to each video source and audio-source, can switch to one tunnel input in one or more output.The video section of output is by the formatted output of 20 bits, and audio-frequency unit is by the AES formatted output, and auxiliary data is by the output of single-bit serial mode.
Described SDI sending module in order to realize 20 bit parallel data are converted to 5 bit serial data of LVDS vision signal, comprises the following steps,
A. calculate and insert TRS;
B. calculate CRC and insert video flowing for high-definition signal (HD and 3G), calculating CRC for SD signal (SD), being packaged into EDH and wrapping and insert video flowing;
C. generation and the embedding of the generation of audio A CP and embedding and audio A/D P;
D. auxiliary data is encapsulated as the auxiliary data bag, inserts video flowing;
E.20bit arrive the serialization conversion of 5bit;
F. carry out scrambler according to scrambler generator polynomial g1 (x)=x9+x4+1 and g2 (x)=x+1.
Described audio frequency output module, the I2S that is converted in order to the voice data of AES form or the voice data output of AES form.
Described video encoder output module is converted to Video coding digital to analog converter chip acceptable formatted output to the data of inner 20 bits, according to data flow, provides corresponding field synchronization, vertical synchronization and horizontal synchronization.
Described HDMI sending module according to the data that are converted to the CEA form, generates corresponding field synchronization, vertical synchronization, horizontal synchronization and clock zone, gives outside HDMI transmitted signal.
The invention has the beneficial effects as follows, can realize conversion mutually between various video modes, convenient and swift.
Description of drawings
Fig. 1 is the present invention: the structural representation of a kind of transmission of multi-media signal and the equipment of conversion;
Fig. 2 is the present invention: the structural representation of a kind of transmission of multi-media signal and the system of conversion.
Embodiment
For technological means, creation characteristic that the present invention is realized, reach purpose and effect is easy to understand, below in conjunction with concrete diagram, further set forth the present invention.
With reference to Fig. 1-shown in Figure 2, a kind of transmission of multi-media signal and the equipment of conversion is characterized in that, this equipment comprises:
One signal input part, this signal input part is used for multimedia signal receiving;
One primary processor, described primary processor are responsible for the multi-media signal from described signal input part is carried out conversion process;
One signal output part, this signal output part are used for the multi-media signal after described primary processor conversion process is identified output;
One register, described register are mainly used in the multi-media signal of described signal input part reception and the multi-media signal after described primary processor conversion process are stored.
Described signal input part comprises SDI light signal input interface, SDI signal of telecommunication input interface, analog video signal input interface and webmaster signal input interface.
Described signal output part comprises SDI light signal output interface, SDI electrical signal output interface and analog video signal output interface.
A kind of transmission of multi-media signal and the system of conversion is characterized in that, comprising:
The signal input module that is used for multimedia signal receiving;
Communicating by letter with described signal input module is connected, and responsible conversion process is from the main processor modules of described signal input module multi-media signal;
Communicating by letter with described main processor modules is connected, and for the signal output module that the multi-media signal after described main processor modules conversion process is exported;
And communicate by letter with described main processor modules and be connected, be used for the register module that the multi-media signal with after described main processor modules conversion process that described signal input module receives is stored.
Described main processor modules comprises, SDI receiver module, audio frequency input module, Video Decoder input module, HDMI receiver module, auxiliary data input module, test patterns generation module, database path module, SDI sending module, audio frequency output module, video encoder output module, HDMI sending module, auxiliary data output module.
The SDI_RX:(SDI receiver module)
Receive the LVDS vision signal from the SDI interface chip, this signal is the 5-bit serial data.This module is completed following functions,
(1) carry out descrambling according to the scrambler generator polynomial G2 (x) of SDI=x+1 and G1 (x)=x9+x4+1.
(2) TRS (Timing Reference Signal) in the search serial data, be the hexadecimal 3FF of first three word, 000,000 of EAV, SAV inside data flow, the figure of these 3 bytes can not occur in normal video data, only can come across in TRS, so can judge the border of word in data flow.According to the border of judging, serial data stream by go here and there and change, is converted to the parallel data stream of 20 bit widths, the also corresponding reduction of clock of correspondence is in order to follow-uply process data stream.
(3) detect speed, the resolution of input SDI.The method of detection rates is the count cycle of clock setting with local fixed frequency, this cycle is set time length, remove to count the clock pulses number of input video within this cycle, according to this umber of pulse and the ratio of local count cycle, can converse the clock frequency of input, thereby extrapolate the speed of input.Native system accurately detects following speed: 270MHz, 1.485GHz, 1.485/1.001GHz, 2.97GHz, 2.97/1.001GHz.Detection time, several microseconds got final product, and detection time is longer, and precision is higher.Detection resolution is according to the situation of change of the FVH in TRS sign, what arranged in calculating one capable, and how many pixels are the length of delegation have, and are interlaced scanning system or progressive-scan system, thereby can accurately judge concrete video format.
(4) CRC and EDH detect.For the HD video form, each provisional capital is embedded with CRC and calculates, local video data to reception carries out CRC and calculates, compare with the crc value that receives, if the same there is no crc error, if difference crc error is arranged, firmware program adds up this mistake, and depositing register in, webmaster can read this numerical value.For the SD video format, use the mode of EDH packet to transmit CRC.Equally, at first search EDH and parse CRC, then comparing with CRC that local computing goes out, wrong register is cumulative.Register can restart under network management control in zero clearing.
(5) de-embedding of auxiliary data.Comprising user-defined data, data such as webmaster remote information, platform-lens control information, environmental variance information, these data are transmitted by the auxiliary data bag.
(6) de-embedding of audio frequency.By ACP and the ADP of search and parsing audio frequency, the number of channels of the audio frequency in judgement SDI, audio sample rate and position are dark.By search with resolve ADP, wherein voice data solution out, and remove shake by FIFO, revert to the bit rate output of continuous uniform.This module can detect the embedding state of all 16 voice-grade channels, and all voice-grade channels of de-embedding.With the resource situation of FPGA, can control the actual voice-grade channel quantity that solves by the parameter that module is set according to actual needs.
AUDIO_IN:(audio frequency input module)
The data of the I2S of audio reception or AES form, its number of channels can be set to the 1-8 road by parameter.If that input is I2S, internal condition AES3-2003 standard packaging is the AES form.I2S is the output of the ADC chip of analogue audio frequency revolution word in this system, and the audio data stream that parses in the HDMI data flow of HDMI receiver.The AES interface is that outside AES input signal carries out level conversion and signal shaping data flow afterwards through receiver.
VDEC_IN:(Video Decoder input module)
The analog video decoder device is converted to the vision signal of outside input the vision signal of number format, is input to fpga chip.FPGA is carrying out the clock zone conversion, and the data that receive are changed on the internal system time clock territory, so that follow-up high speed processing.
The HDMI_RX:(HDMI receiver module)
From the data that the HDMI receiver is come, employing be the standard of CEA.This field row timing standard from the SMPTE standard of inside is different.At first the HDMI data are carried out the conversion of clock zone, be synchronized on the system clock territory, and then according to field synchronization, vertical synchronization and the horizontal synchronization of input, data stream is carried out Reseal, change TRS makes it to meet the SMPTE standard.
Aux_data_in:(auxiliary data input module)
A UART_RX interface only is provided here, external input signal is carried out the high speed over-sampling, can realize like this transparent transmission of outer input data, and do not spend concrete speed, check digit, position of rest and the data bit length of considering data.Over-sampling speed generally more than 2MHz, can realize the errorless transmission of UART that 115200kbps is above.
Tpg:(test patterns generation module)
Test patterns generation module (test pattern generator) produces simple test signal commonly used, as black burst, white field signal, gradual change signal, color bar signal.Also produce in addition the digitized sine wave audio frequency that frequency can be set, the default 1kHz of frequency is for the testing audio function.
YC reference format with the video section of upper module by 20 bits is input to datapath module, and audio-frequency unit is input to datapath module by the AES form.Auxiliary data is serial mode input data path module.
The Datapath:(datapath module)
The function of route handoff is carried out in realization to each video source and audio-source.Can switch to one tunnel input in one or more output.The video section of output is by the YC reference format output of 20 bits, and audio-frequency unit is by the AES formatted output, and auxiliary data is by the output of single-bit serial mode.This part also is responsible for looking communicating by letter of audio processing modules and register control interface, and this realizes by internal data bus.
The SDI_TX:(SDI sending module)
This module is completed following functions, and finally exports the LVDS vision signal (according to configuration, the embedded audio frequency of possibility) of 5 bit serials.
(1) recomputate and insert TRS.This step mainly considers in input video and incorrect TRS can occur, and this situation generally appears in the unstable or situation of losing of input data, can make follow-up equipment stably work under synchronous regime so regenerate TRS.
(2) calculate CRC and insert video flowing for high-definition signal (HD and 3G).
(3) calculate CRC for SD signal (SD), be packaged into the EDH bag, and insert video flowing.
(4) generation of audio A CP and embedding.
(5) generation of audio A/D P and embedding.
(6) auxiliary data is encapsulated as the auxiliary data bag, inserts video flowing.
(7) 20bit is to the serialization conversion of 5bit.
(8) carry out scrambler according to scrambler generator polynomial g1 (x)=x9+x4+1 and g2 (x)=x+1.
Audio_out:(audio frequency output module)
For exterior I 2S interface, inner AES data flow is converted to evenly continuous I2S output.Directly export data for outside AES data.The chip of accepting the I2S audio data stream in native system has the DAC audio chip of HDMI transmitter chip and digital to analogy conversion, and the chip that receives the AES audio data stream is AES digital audio driver.
Venc_out:(video encoder output module)
The YC data of inner 20 bits are converted to Video coding digital to analog converter chip acceptable formatted output, according to data flow, provide corresponding Field, Hsync, Vsync and Clock signal.
The HDMI_TX:(HDMI sending module)
Here at first to be converted to the YC data of inner 20 bits the data of CEA form, generate corresponding Field, Hsync, Vsync, DE (data enable) and Clock give outside HDMI transmitted signal.
The output of Aux_out:(auxiliary data)
DATAPATH from the SDI data flow or the auxiliary data of the high speed over-sampling that chooses in the auxiliary data input module, is sent to outside UART driver by UART_TX, as RS232, RS485 or RS422 chip.Also generate in addition a UART_DE signal, be used for automatically controlling the transmit-receive position of this half-duplex chip of RS485.The generation of UART_DE is simply data stream to be carried out oppositely getting final product.
Above demonstration and described basic principle of the present invention and principal character and advantage of the present invention.The technical staff of the industry should understand; the present invention is not restricted to the described embodiments; that describes in above-described embodiment and specification just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.The claimed scope of the present invention is defined by appending claims and equivalent thereof.
Claims (8)
1. the equipment of the transmission of a multi-media signal and conversion, is characterized in that, this equipment comprises:
One signal input part, this signal input part is used for multimedia signal receiving;
One primary processor, described primary processor are responsible for the multi-media signal from described signal input part is carried out conversion process;
One signal output part, this signal output part are used for the multi-media signal after described primary processor conversion process is identified output;
One register, described register are mainly used in the multi-media signal of described signal input part reception and the multi-media signal after described primary processor conversion process are stored.
2. the equipment of the transmission of a kind of multi-media signal according to claim 1 and conversion, it is characterized in that, described signal input part also comprises SDI light signal input interface, SDI signal of telecommunication input interface, analog video signal input interface and webmaster signal input interface.
3. the equipment of the transmission of a kind of multi-media signal according to claim 1 and conversion, is characterized in that, described signal output part also comprises SDI light signal output interface, SDI electrical signal output interface and analog video signal output interface.
4. the system of the transmission of a multi-media signal and conversion, is characterized in that, this system comprises: the signal input module that is used for multimedia signal receiving;
Communicating by letter with described signal input module is connected, and responsible conversion process is from the main processor modules of described signal input module multi-media signal;
Communicating by letter with described main processor modules is connected, and for the signal output module that the multi-media signal after described main processor modules conversion process is exported;
And communicate by letter with described main processor modules and be connected, be used for the register module that the multi-media signal with after described main processor modules conversion process that described signal input module receives is stored;
Wherein, described main processor modules also comprises: SDI receiver module, audio frequency input module, Video Decoder input module, HDMI receiver module, auxiliary data input module, test patterns generation module, database path module, SDI sending module, audio frequency output module, video encoder output module, HDMI sending module, auxiliary data output module.
5. the system of the transmission of a kind of multi-media signal according to claim 4 and conversion, it is characterized in that: described SDI receiver module, be mainly in order to realizing that 5 bit serial data of LVDS vision signal are converted to 20 bit parallel data, this transfer process comprises the following steps
Steps A, described vision signal are carried out descrambling according to the multinomial that the SDI scrambler generates;
Step B, the TRS of search in above-mentioned serial data, and above-mentioned serial data stream is converted to the parallel data stream of 20 bit widths;
Speed and the resolution of step C, detection SDI;
Step D, CRC and EDH detect;
Step e, auxiliary data is carried out the audio frequency de-embedding.
6. the system of the transmission of a kind of multi-media signal according to claim 4 and conversion is characterized in that: described audio frequency input module, in order to the data of the I2S of audio reception or AES form and be converted to AES formatted data stream;
Described Video Decoder input module, the video signal data that is converted to 20 bits in order to the vision signal with the outside input flows;
Described HDMI receiver module in order to the HDMI data are carried out the conversion of clock zone, is synchronized on the system clock territory, and then according to field synchronization, vertical synchronization and the horizontal synchronization inputted, and data stream is carried out Reseal, and change TRS, be changed to the parallel data stream of 20 bit widths;
Described test patterns generation module, in order to produce simple test signal commonly used and the digitized sine wave audio frequency of frequency, the default 1kHz of frequency is for the testing audio function.
7. the system of the transmission of a kind of multi-media signal according to claim 4 and conversion, is characterized in that, described SDI sending module in order to realize 20 bit parallel data are converted to 5 bit serial data of LVDS vision signal, comprises the following steps,
A. calculate and insert TRS;
B. calculate CRC and insert video flowing for high-definition signal, for SD calculated signals CRC, being packaged into EDH and wrapping and insert video flowing;
C. audio A CP and audio A/D P generate and embed in video flowing;
D. auxiliary data is encapsulated as the auxiliary data bag, inserts video flowing;
E.20bit arrive the serialization conversion of 5bit;
F. the multinomial that generates according to scrambler carries out scrambler.
8. the system of the transmission of a kind of multi-media signal according to claim 4 and conversion is characterized in that: described audio frequency output module, the I2S that is converted in order to the voice data of AES form or the voice data output of AES form;
Described video encoder output module is converted to Video coding digital to analog converter chip acceptable formatted output to the data of inner 20 bits, according to data flow, provides corresponding field synchronization, vertical synchronization and horizontal synchronization;
Described HDMI sending module according to the data that are converted to the CEA form, generates corresponding field synchronization, vertical synchronization, horizontal synchronization and clock zone, gives outside HDMI transmitted signal.
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| CN110166724A (en) * | 2019-05-24 | 2019-08-23 | 无锡中感微电子股份有限公司 | A kind of multi-medium data sending method and device based on coaxial cable |
| CN110166724B (en) * | 2019-05-24 | 2021-01-12 | 无锡中感微电子股份有限公司 | Multimedia data sending method and device based on coaxial cable |
| CN110351512A (en) * | 2019-05-24 | 2019-10-18 | 无锡中感微电子股份有限公司 | A kind of data transmission method for uplink and device based on coaxial cable |
| CN111479096A (en) * | 2020-03-12 | 2020-07-31 | 合肥赛为智能有限公司 | Optical fiber signal encoder and method thereof |
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Application publication date: 20130605 |