[Videophone] How to make a videophone and how to use a videophone
Videophone is a product of technology in recent years, but many people do not know how to make a call Videophone, below I will explain in detail how to make a videophone.
How to make a videophone
Videophone can be divided into PSTN type, ISDN type, private network type and other methods. The videophone working on PSTN can transmit 10-15 frames per second; the videophone working on ISDN can transmit more than 15 frames per second. At present, there are two main types of videophone products, one is a videophone with a personal computer as the core, and is equipped with input and output devices such as cameras, microphones and speakers in addition to the computer; the other is a dedicated videophone device. , it can be directly connected to the home telephone line for video calls just like a normal telephone.
Videophone can be divided into static image videophone and dynamic image videophone according to different image display. Static image The image displayed on the screen of the videophone is still, and the image signal and the voice signal are transmitted alternately using the existing analog telephone system, that is, a call cannot be made when the image is transmitted; it takes 5 to 10 seconds to transmit a frame of the user’s half-length still image. . A videophone device can be connected to the public telephone network just like an ordinary telephone. The biggest disadvantage of this videophone is that it takes a long time to transmit a picture, and the image and voice cannot be transmitted at the same time, so it is difficult to meet the current user’s demand for high-quality videophone. However, because it has the advantage of only occupying one analog telephone line for transmission, it is convenient to use the existing ordinary telephone line, so the static image videophone can be used in some occasions where the requirements for dynamic images are not high.
Then, how to make a videophone call? The steps are as follows:
1. Determine the 3G signal coverage: Take a mobile phone as an example. 3G network is TD-SCDMA mode, when making video calls, it should ensure good coverage, and the signal is the guarantee of image data transmission.
Second, ensure the communication mode of the mobile phone: the video call needs to be in 3G mode, not in the ordinary 2G voice mode, so before making a video call, please make sure the mode is correct, otherwise the video call is connected unsuccessful.
3. Check whether the mobile phone of the other party you want to call supports videophone? If the other party’s mobile phone is not a 3G mobile phone or the video calling function is not turned on, it cannot video with you.
Fourth, check whether the mobile phone of the other party you want to dial is the same operator as you? At present, the video call interconnection between China Mobile, China Unicom, and China Telecom has not been opened, so the mobile phone video of 189 calling 186 will not work.
5. Select the call mode: Generally, when making a call on a 3G mobile phone, there will be an additional option of “video call”. When making a video call, you need to choose this instead of a normal voice call.
6. Pay attention to the camera position and light: mobile phones that can make video calls generally have two cameras, front and rear, so in a video call, the camera needs to be pointed at the speaker’s face to collect image information. There is a problem with light, and it is recommended to use a headset to talk, which is more conducive to clear images and easy movement.
7. Display effect: It is generally recommended to make a video call in a room where the light is not too strong, or adjust the brightness of the mobile phone screen, so as to better see the video of the other party. It is inevitable that there will be shaking during video communication. The smoothness of the picture is also related to the signal or the performance of the mobile phone itself.
The above are the steps I introduced on how to make a videophone. The application of videophone in life will become more and more widely. People don’t have to travel thousands of miles to meet one another, and videophones have greatly reduced people’s geographic distance.
