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Data communication device and data communication method

A data communication and data stream technology, applied in image communication, digital video signal modification, pulse modulated television signal transmission, etc. Effect

Inactive Publication Date: 2008-12-31
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, on the premise that there are multiple compression units in the data communication device, the cost of the data communication device will increase.

Method used

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  • Data communication device and data communication method
  • Data communication device and data communication method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0077] Embodiment 1 of the data communication device according to the present invention will be described below with reference to the drawings.

[0078] In addition, the network camera terminal according to the first embodiment is characterized in that I frames corresponding to each data stream are generated at an I frame generation rate described in a generation table held in advance by the frame control unit. Also, the network camera terminal in the description of the following embodiments corresponds to the data communication device described in the claims.

[0079] FIG. 3 is a functional block diagram showing the configuration of a network camera terminal 300 according to the first embodiment.

[0080] The network camera terminal 300 according to the first embodiment includes a sensor unit 301 that inputs image information, a Y / C unit 302 that performs Y / C processing on images taken from the sensor unit 301, and compresses and encodes Y / C data to generate encoded frames. ...

Embodiment 2

[0091] A second embodiment of the present invention will be described below with reference to the drawings.

[0092] Furthermore, the network camera terminal according to the second embodiment is characterized in that the network camera terminal does not use a generation table to fix the generation rate of I frames in each stream as in the above-mentioned embodiment 1, and the generation rate of I frames in each stream When the rate is changed, the down counter unit included in the frame control unit is used to control so that I frames are not repeatedly generated in a plurality of streams.

[0093] FIG. 8 is a functional block diagram showing the configuration of a network camera terminal 800 according to the second embodiment.

[0094] The network camera terminal 800 according to the second embodiment includes, in addition to the configuration of the above-mentioned first embodiment, a down counter unit 305a for counting the number of control frames generated in each of the ...

Embodiment 3

[0104] A third embodiment of the present invention will be described below with reference to the drawings.

[0105] 10 is a functional block diagram showing the structure of a network camera terminal 1000 according to the third embodiment, which is characterized in that, in addition to the structure of the first embodiment, it also includes a frequency band monitoring unit 1001 for monitoring the communication frequency band of the communication unit 304 .

[0106] Hereinafter, the operation processing of the network camera terminal 1000 in the third embodiment will be described.

[0107] First, image information is input from the sensor unit 301 . The sensor unit 301 digitally converts the image information and sends it to the Y / C unit 302 . The Y / C unit 302 reads the digital data transmitted from the sensor unit 301 , converts the data size after Y / C processing, and sends it to the compression unit 303 as Y / C data.

[0108] Next, the compression unit 303 receives the Y / C d...

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Abstract

The present invention provides a data communication apparatus for solving the following problem. When generating coded frames of multiple data streams, in the case where there is a bias in code amount of the generated coded frame, the communication apparatus is instantaneously overloaded, causing packet losses. The network cameral terminal which is the data communication apparatus includes a sensor unit that takes images or audio information, a compression unit that compression-codes the image or the audio signal and generates coded frames (I-frame, P-frame, B-frame and others), a frame control unit that controls types of the coded frame generated by the compression unit using a generation table held in a generation table holding unit, and a communication unit that transmits the coded frames to multiple communication terminals on the network in parallel.

Description

technical field [0001] The present invention relates to a data communication device, which uses IP (Internet Protocol: Internet Protocol) data packet conversion processing technology to perform real-time communication of compressed and coded images or sound signals through computer networks such as the Internet. Background technique [0002] In recent years, using network circuits to transmit digital data including image or sound information has become a very common and implemented method. These images and audio information are used in various forms, among which there are many cases for the purpose of surveillance and observation. These are devices that combine a camera, an image processor, and network communication equipment. Users can access the device installed in the part of the image or audio they want to view through the network, and can view remote images or audio. [0003] FIG. 1 is a reference diagram showing a configuration example of a conventional network camera...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/24H04N7/58H04L47/2475H04L47/80H04N19/00H04N19/102H04N19/127H04N19/146H04N19/159H04N19/166H04N19/196H04N19/503H04N19/70
CPCH04N7/183H04N21/2187H04N21/23406H04N21/234363H04N21/2381H04N21/2402H04N21/44004H04N21/64322
Inventor 山内进一郎竹内昭夫古山孝好
Owner PANASONIC CORP
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