| 摘要 |
The invention is about video recording system for vehicle that is linked to speedometer of the car. Video signal from video camera installed in the car is mixed with character video signal cor¬ responding to the speed of the car, and is written/updated into temporary memory (RAM) in real¬ time manner. When the car stops, the video file that has been written in the said temporary memory is dumped into main memory that has memory size of several files. In case an accident happens in the middle of driving, the car normally stops. Therefore, the video file recorded by the system of the invention contains the pictures of the pre- accident process that leaded to the accident. If user input preserve request to the system, the file that has been dumped just before the request is input is preserved. That is, the file to be preserved is not erased through successive dumping precess. If user input record request to the system, the file that has been written in the said temporary memory is promptly dumped into the said main memory regardless of speed of the car and is preserved. Hereby, the recording system of the invention has the following advantageous points. (1) It records video of pre- accident driving process. Moreover, the picture of the recorded video shows the speed of the car. Those will make it possible to judge clearly which side is more responsible for the accident. (2) It costs low, because it uses no other sensors but speedometer of the car and records only a few files of pre-determined duration into memory device having small memory size. (3) It can be easily installed in a car, because it uses no other sensors but speedometer of the car.
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