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A data transmission method and device based on a coaxial cable

A data transmission method and coaxial cable technology, applied in the field of data transmission, can solve problems such as increasing costs

Active Publication Date: 2021-08-20
WUXI ZGMICRO ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for the existing traditional monitoring environment, the network cable needs to be replaced, which increases the cost

Method used

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  • A data transmission method and device based on a coaxial cable
  • A data transmission method and device based on a coaxial cable
  • A data transmission method and device based on a coaxial cable

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] 步骤S110:接收多媒体数据流;将多媒体数据流进行数据格式转换,得到第一数据流,所述第一数据流由多个位宽为L的第一数据包构成。

[0065] 其中,接收多媒体数据流时,获取多媒体数据流中包含的10位视频数据、32位音频数据、1位行同步信号和1位场同步信号。作为本技术领域内的公知技术,行同步信号可用于指示上一行多媒体数据流传输结束和下一行多媒体数据流传输开始,因而对应于前述实施例,可以将一行多媒体数据流视作一组源数据。

[0066] 将10位视频数据、1位行同步信号、1位场同步信号和1个扩展位,用0补足扩展位,形成13位的第一数据包,如表1所示,其中Din[9:0]表示10位视频数据。所述扩展位用于后续进行数据包合并 / 拼接时,进行数据间隔。扩展位可以根据需要设置1位或多位,亦可自定义扩展位的值。

[0067] Bit12 Bit11 Bit10 Bit9 Bit8 Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0 Din[9] Din[8] Din[7] Din[6] Din[5] Din[4] Din[3] Din[2] Din[1] Din[0] HSYNC VSYNC 0

[0068] 表1 13位的第一数据包

[0069] 步骤S120:将第一数据流中的第一数据包依次用于循环冗余CRC计算,并根据预定规则,输出CRC码,所述CRC码由多个位宽为L的CRC数据包构成;将所述CRC码插入所述第一数据流中,形成第二数据流,所述第二数据流由多个位宽为L的第二数据包构成。

[0070] 其中,设置CRC计算公式要求的数据位宽为10,将第一数据包扩展成20位。如将13位的第一数据包中的扩展位,及为了计算扩展的7位,均设置在20位数据包的低位,并用0补足。数据格式如表2所示。

[0071]

[0072] 表2扩展为20位的第一数据包

[0073] CRC计算的具体方法可以采用本领域内的通用技术,本发明中对此不做具体限定。

[0074] 如本实施例中,采用CRC多项式EDC(x)=x 18 +x 5 +x 4 +1,分别对扩...

Embodiment 2

[0096] Step S110: Receive a multimedia data stream; perform data format conversion on the multimedia data stream to obtain a first data stream, and the first data stream is composed of a plurality of first data packets with a bit width L.

[0097] Wherein, when the multimedia data stream is received, 12-bit video data, 32-bit audio data, 1-bit line synchronization signal and 1-bit field synchronization signal contained in the multimedia data stream are obtained.

[0098] The 12-bit video data, 1-bit line synchronization signal, 1-bit field synchronization signal and 1 extension bit are complemented with 0 to form the first data packet of 15 bits, as shown in Table 4, where Din[11:0 ] indicates 12-bit video data. The extension bit is used for subsequent data packet merging / splicing to perform data interval. One or more bits can be set for the extension bit as required, and the value of the extension bit can also be customized.

[0099] Bit14 Bit13 Bit12 Bit11 ...

Embodiment 3

[0128]Step S110: Receive a multimedia data stream; perform data format conversion on the multimedia data stream to obtain a first data stream, and the first data stream is composed of a plurality of first data packets with a bit width L.

[0129] Wherein, when the multimedia data stream is received, 16-bit video data, 32-bit audio data, 1-bit line synchronization signal and 1-bit field synchronization signal contained in the multimedia data stream are obtained.

[0130] The 16-bit video data, 1-bit line synchronization signal, 1-bit field synchronization signal and 1 extension bit are complemented with 0 to form the first data packet of 19 bits, as shown in Table 7, wherein Din[15:0 ] indicates 16-bit video data. The extension bit is used for subsequent data packet merging / splicing to perform data interval. One or more bits can be set for the extension bit as required, and the value of the extension bit can also be customized.

[0131] Bit18 Bit17 Bit16 Bit15...

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Abstract

The invention discloses a coaxial cable-based data transmission method and device, including data receiving and format conversion steps, CRC calculation and insertion steps, bit mapping steps, parallel conversion steps, etc. Data, and according to the predetermined rules, the data format is converted, and the CRC check code and TRS sequence are inserted, and then according to the predetermined parallel data bit width W, the data packet is mapped into a data packet with a bit width of W, and further converted into a 1 The bit serial data is transmitted through the coaxial cable, and the device includes: a data receiving and format converting unit, a CRC calculating and inserting unit, a bit mapping unit and a converting unit. The invention converts the source data into serial data and sends them through the existing coaxial cable, thereby greatly reducing the cost.

Description

technical field [0001] The invention relates to the field of data transmission, in particular to a coaxial cable-based data transmission method and device. Background technique [0002] At present, as China's video surveillance market is stimulated and driven by factors such as safe city construction and other security projects and the rapid growth of video surveillance demand in various industries, it has achieved extraordinary rapid development, and the overall market scale has expanded rapidly. Due to its low image definition, the analog monitoring system can no longer meet the security requirements. However, the adoption of a fully digital monitoring system will bring a large cost of network cable deployment, especially for the renovation of monitoring systems in old residential areas and factories. [0003] With the wide application of video surveillance, the demand for digitalization is getting higher and higher, showing the trend of replacing traditional analog syste...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N7/10H04N7/18
CPCH04N7/102H04N7/18
Inventor 瞿军武施彦薛骏
Owner WUXI ZGMICRO ELECTRONICS CO LTD
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