Abstract:
A video signal communication method, applicable to IP phone, the method comprises of the following steps: when starting up the supporting video signal function, also starting to receive transmission using video related communication protocol; receiving the internet address setting of the video processing device to retrieve the internet address of the video processing device; determining if the video processing device is initialized; determining if the connected video processing device is initialized and then transmitting the received video signal to the video signal processing device; processing video signal via the compression/decompression module, and the video processing device displaying the video signal.

Description:
BACKGROUND OF THE INVENTION 
   1. Field of Invention 
   The present invention relates to a video signal communication method, applicable to an internet protocol phone, especially related to a method of adding a video communication to an internet protocol phone. 
   2. Related Art 
   Due to the popularity of broadband networks, the utilization of the internet has changed to long computer online connections. This change is not only applicable to computer users&#39; work and usage, but also applies to the consumer&#39;s products. Due to the long online connection to the Internet, people are network neighbors and can communicate with each other using the Internet, therefore many internet related applications are produced, including Internet TV, Internet Stations, and IP phones. Recently, VoIP (voice over Internet Protocol) has been very popular in the Internet world; VoIP changed the communication model between people. VoIP is a technology using the internet as the transmission medium and transmit voice using an Internet Protocol address. The telephone using the VoIP protocol is called an Internet Protocol Phone (IP phone). Since the early internet transmission speed is limited, the voice of the opposite terminal using low resolution compression standard is not clear. And using a high resolution compression standard makes the files become large and the transmission rate is slow, the voice becomes discontinuously. Therefore it is not suitable for daily use. As broadband becomes popular and widespread, everyone has high speed network transmission, the voice sampling compression can be increased, and the quality can be increased close to the normal telephone. Not only apply for the voice, but sampling 1000 k/sec motion Real Player file images is also not a problem. Therefore the video system on internet is getting popular. The current IP phone has three different types: 1. computer to phone, 2. computer to computer, 3 phone to phone. The following explains these types. The computer to telephone type, using the normal computer and IP phone, can use ADSL or cable high speed network transmission. Usually, it requires application for an account number from the VoIP service company and the purchase of specific software to install on the computer, plus headsets and a microphone, through a VoIP service computer&#39;s switch, connected to the IP phone of the communication side. For the computer to computer version, we have in mind normal computer to computer users, with installed talking software, headsets and microphone, talking to each other. For example, an i-phone that has been introduced for a while now, or the MSN Messenger that&#39;s being used by many people, these are the original forms of IP phone. The phone to phone communication uses the switch technology and a stable network to form a phone to phone&#39;s loop. However, it is very costly, and needs to place server management, so it is the format used by privately owned internationally telephone companies. From the above description, it provides the current applications of internet phones. The IP phones with display devices and image recording devices are very expensive, so they are not affordable to every user for purchasing IP phones with a display device and an image recording device, and not every user can pay a simple, convenient, and reasonable price to enjoy video phone communication. 
   SUMMARY OF THE INVENTION 
   Combining the above descriptions, the invention provides a video communication method, applied to an IP phone, so the user can easily use an IP phone to achieve the goal of video communication. 
   According to the goal of the invention, a video communication method, applied to an IP phone, the method comprises the following steps: when starting up the supporting video signal function, receives a transmission using a video related communication protocol. receives the internet address setting of the video processing device to retrieve the internet address of the video processing device; receives a video signal from the communication terminal and uses the video processing device&#39;s internet address to verify if the video processing device is initialized. After having verified if the connected video processing device is initialized, the user transmits the received video signal to the video signal processing device; processes the video signal via the compression/decompression module, and displays the video signal using the video processing device. The video processing device receives the transmitted back video signal, through the compression/decompression module to process the signal, and the transmitted back video signal is transmitted through the network to the internet voice phone. The transmitted back video signal is combined with the transmitted back voice signal, and they are transmitted back to the communication terminal. 
   The invention, proposes a video communication method, applicable to comprise a communication system, an IP phone and a video processing unit. The IP phone comprises of: a internet address setting module, using the internet address of the video processing device and the internet address of the communication terminal retrieved from the telephone control module, and storing the internet address of the video processing device and the internet address of the communication terminal in the storage module. The network control module uses the internet address of the video processing device and the internet address of the communication terminal. This is to control and receive the external and internal area network data transmission between the internet voice phone and the voice processing device and the internet voice phone and the communication terminal. The internal area network includes, wired and wireless, the phone control module, used to control the communication process between the communication terminals. It includes controlling the voice playing module to play the communication&#39;s voice signal, and transmitting the communication&#39;s video signal to the video processing device for processing via the area network, and displaying on the video processing device. After receiving the transmitted back video and voice signals, they are combined to be transmitted using external network to the communication terminal. The video receiving module is used to receive the initializing video signal from the control module and initialize the IP phone&#39;s function to receive a video signal. The video processing device comprises of a control module, used to control the transmission and display of the video signal with the IP phone. It also controls the video signal&#39;s compression and decompression process, so the decompressed video signal is displayed on the video-processing device. A display module is also included, used to display the decompressed video signal on the video processing device. And finally, a compression/decompression module is used to decompress the video signal transmitted from the control module and to compress the transmitted back video signal received from the control module. 
   Further scope of applicability of the present invention will become apparent from the detailed description given hereinafter. However, it should be understood that the detailed description and specific examples, while indicating preferred embodiments of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from this detailed description. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
     The present invention will become more fully understood from the detailed description given here in below illustration only, and thus is not limitative of the present invention, wherein: 
       FIG. 1  illustrates, in the floating block diagram, the IP phone with additional video function display. 
       FIG. 2  illustrates the structure of the video communication system of the invention; the IP phone transmits through a wired area network and communicates with video processing device. 
       FIG. 3  illustrates the structure of the video communication system of the invention; the IP phone transmits through a wireless area network and communicates with a video processing device. 
       FIG. 4  illustrates the structure of the video communication system of the invention, it comprises of the internal structure of the IP phone and the internal structure of the video processing device connected to the same network. 
   

   DETAILED DESCRIPTION OF THE INVENTION 
   As shown in  FIG. 1 , the flowing block diagram of the additional video display function to the internet voice phone includes both the internet voice phone and the video processing device. The communication method is described in contrast with  FIG. 1 . When the internet voice phone is turned on (step  100 ), the telephone control module has the settings according to the telephone functions, and verifies if the video image supporting format is entered. The telephone function condition is set by the user, and it can be selected to receive both video and voice signals, or only receive the voice signal (step  101 ). If the telephone setting is set to support video communication, then the internet voice phone enters the video supporting format, and supports the related video communication protocol and compression format, such as the standard compression format H.261, H. 263, set by the International Telecommunication Union (ITU), or the video compression standards, such as MPEG4, set for multimedia applications by the MPEG (Moving Pictures Export Group) within the International Standard Organization (ISO). The user also has to enter the supporting video processing device&#39;s internet address and URL, by entering the URL and bringing out the corresponding IP address (step  102 ). After verifying if the supporting video processing unit supports the receiving of video signal, as a phone call is incoming (when receiving communication signals), the telephone control module verifies if video signals are received according to the communication signal. Further, the control module determines if the incoming call is from a videophone (step  103 ). If video signals exist, then it connects via the network to the video-processing device using the URL and an internet address in the setting (step  104 ). The video processing device needs to first activate video communication functions to support instant real time playback, then the IP phone packages the received video signal and transmits them to the video processing device through a network channel (step  105 ). After the video-processing device has decompressed the video signal, it is played on the video-processing unit. The received video and audio signals are played by the IP phone directly. The video-processing unit receives the play back video signal from the video recording device, it first passes the compression/decompressing module to be decompressed first, and after that transmitted to the internet voice phone. The telephone control module combines the playback video and playback audio signals and transmits them to the receiving terminal of the communication system, which allows the user to have bidirectional audio and video communication (step  106 ). The compression/decompression module can support the related video communication protocol and compression format, such as ITU H.261, H.263 format or MPEG 4 format. If it was determined that the internet voice phone does not enter the video supporting format, or it did not receive video signals, or the video device was not initialized, the telephone control module controls the internet voice phone to only use voice signals for communication (step  107 ). Also, the video processing device needs to be turned on before the process (step  108 ), and first set the internet address and URL to allow internal network or network connection identification (step  109 ). An internet phone can use the internet address or URL to verify the location of the video processing device on the network and transmit video signal to it. After the setting is completed, when receiving a video signal, the video processing device activates the video communication function to support the instant video playback function, so the video signal can be played by the video processing device (step  110 ). 
   As shown in  FIG. 2 , which illustrates the structure of the video communication system, the IP phone transmits, using a wired local area network to connect with the video processing device for video communication. The IP phone  203  in  FIG. 2  uses the network to transmit and receive communication signals from a video phone  201 . The communication signal can be divided into two parts, video and voice. When the package voice and video signals are transmitted via the network to the IP phone  203 , which is the same as when the IP phone  203 &#39;s telephone control module (not shown in the picture) receives the communication signals, it verifies if video signal is received according to its own communication settings. For example, it checks if the setting allows simultaneous receiving of the voice signal and video signal according to the video related transmitting protocol. If it is verified that the setting allows the receiving of related video protocol, it uses the IP address of the video processing device  202  in the setting to find the condition of the video processing device  202 . If the condition of the device is normal and the device has been initialized, the packaged video signal is transmitted using the internal network&#39;s video transmission channel to the video processing device  202 . The video processing device  202  decompresses the video signal and plays it with the instant video playback software. The control module in the video-processing unit  202  receives the playback video signal from the image-recording device (such as a recorder). After having compressed the data and having packaged them, it uses the network image transmission channel to transmit the data to the IP phone  203 , and the IP phone  203  transmits the packaged data through the network to the video phone  201 . The video-processing device  202  includes a device that can process a video signal and also play the video signal. This device can be connected using a wired network to provide data transmission, such as computer systems, etc. 
   As shown in  FIG. 3 , which illustrates the structure of a video communication system of the invention, the IP phone uses a wireless network to transmit to the video processing device for video processing. The IP phone  303  in  FIG. 3  uses the network to receive the communication signals from the video phone  301 . The communication signal can be divided into two parts, video and voice. When the packaged voice signal and video signals are transmitted via the network to the IP phone  303 , which is the same as when the IP phone  303 &#39;s telephone control module (not shown in the picture) receives the communication signals, it verifies if it is able to receive video signals according to its won communication settings, which is the communication setting of the phone. If it is verified that the setting allows the receiving of related video protocol, it can start to simultaneously receive voice and video signals. It uses the IP address of the video processing device  302  in the setting to find the condition of the video processing device  302 . If the condition of the device is normal, and the device has been initialized, the packaged video signal is transmitted using the internal wireless network to the video processing device  302 . By using the video processing device  302  to decompress the video signal and play it using instant playback software, the control module of the video processing device  302  receives the playback video signal from the image recording device (such as a recorder). After the data are compressed and packaged, it uses a wireless network&#39;s data transmitting channel to transmit to the IP phone  303 . Finally, the IP phone  303  uses a wireless network to transmit to the video phone  301 . The received playback voice data by the IP phone  303  can be directly transmitted through the network to the video phone terminal. The video processing device  302  comprises of a device that is capable of processing a video signal and play video signals; this device can be connected using a wireless network for data transmission, such as computer systems or PDA or cell phones. The IP phone  303  can be a wired IP phone, wireless IP phone, or cell phone. 
     FIG. 4  shows the structure of the video communication system of the invention, having the internal structure of the IP phone, and the internal structure of the network connected video processing device. The IP phone  400  includes, a telephone control module  402 , a network control module  403 , a video signal initialization module  408 , an IP address setting module  409 , a storage module  410 , and a voice playing module  411 . The video processing device  401  comprises of a control module  404 , a display module  405 , a compression/decompression module  406 , and an image recording device  407 . 
   The following describes the video communication method using the illustration of every module in the IP phone and video processing device, of  FIG. 4 . First, the telephone control module  402  receives the IP addresses of the communication terminal and the video processing device  401 ; it controls the IP address setting module  409  to store these two addresses in the storage module  410 . When an IP phone  400  uses the network to transmit data, it can control the network control module  403  to use the IP address setting in the storage module  410  for network data transmission. The telephone control module  402  is also used to control the communication setting of the IP phone  400  to use the communication setting to determine the receivable communication format by the IP phone  400 . The communication settings include two models, one is receiving voice signals only, and the other is simultaneously receiving the video and voice signal, that is, if it can receive the video-related protocol, like H.261, H.263 or MPEG4 format signals. When the telephone control module  402  receives the video initialization signal, it controls the video signal initialization module  408  using a video-related protocol to initialize and receive video transmission. After having determined the IP phone  400 &#39;s condition, it can more appropriately to process the incoming call signals, for example, when the video phone produces a call, the signals include voice and video signal. After the voice signals are transmitted to the telephone control module  402 , the telephone control module  402  controls the voice playing module  411  to process and output the voice signal. Through the network control module  403  and the IP address data storage module  410 , the telephone control module  402  can control the local area network transmission to determine the condition of the video processing device  401 . After having determined the condition, it can then decide if it will transmit the video signal to the video processing device  401  for video processing. The condition of the video processing device  401  shows if the device has been initialized and the preparations for receiving video signals has been completed. After having determined the condition of the video processing device  401 , the telephone control module  402  controls the network control module  403  using the local area network to transmit the video signal to the video processing device  401 ; the control module  404  of the video processing device  401  controls the compression/decompression module  406  to decompress the data, and transmits them to the display module  405  for playing. The image recording device  407  of the video processing device  401  captures images, it transmits the video signal to the control module  404 , and the control module  404  transmits the received video signal to the compression/decompression module  406 . The compression/decompression module  406  compresses the data according to the video communication related protocol, such as H.261, H.263, or MPEG4 formats and produces the video signal to transmit back. This format is the same as the compression format coming from the communication terminal. Control module  404  transmits the transmitted back video signal through the local area network to the IP phone  400 &#39;s telephone control module  402 . The telephone control module  402  combines the transmitted back signal with the transmitted back voice signal, through the control network transmission by the network control module  403  to the other communication terminal. The video-processing device comprises of a device capable of processing and playing the video signal. This device can use wired or wireless network connection for data transmission, such as a computer system, palm pilot, or cell phone, and the communication terminal. The IP phone  400  can be a wired IP phone or wireless internet cell phone. 
   The invention being thus described, it will be obvious that the same may be varied in many ways. Such variations are not to be regarded as a departure from the spirit and scope of the invention, and all such modifications as would be obvious to one skilled in the art are intermingled to be included within the scope of the following claims.