Video signal generator
A video signal generator, employing a multi-output amplifier and a video signal connector, is physically connected to a device under test to eliminate the use of signal cables, to solve the impedance matching issue, and to reduce noise from the signal cables' exposure to high temperatures. Moreover, the video signal generator employs a video algorithm stored in a programmable microprocessor and instructions downloaded to provide on-line adjustable video patterns sets for test. The video signal generator includes the programmable microprocessor, a television encoder, a multi-output amplifier, and a video signal connector.
1. A video signal generator comprising:
a programmable microprocessor storing a video algorithm for generating a first digital video signal;
a television encoder transforming the first digital video signal into a first analog video signal;
a multi-output amplifier transforming the first analog video signal into a plurality of second analog video signals;
a video signal connector for physically connecting to a device under test and transmitting the second analog video signals to the device under test;
an analog video signal input port and an input switch to receive a third analog video signal provided externally, said input switch being connected between said television encoder and said multi-output amplifier, said analog video signal input port being connected to said input switch.
2. The video signal generator of claim 1 , further comprising:
a download port connected to the programmable microprocessor to download instructions to modify the video algorithm.
3. The video signal generator of claim 1 , further comprising:
a wireless receiver receiving a second digital video signal and transmitting the second digital video signal to said programmable microprocessor.
4. The video signal generator of claim 3 , wherein said wireless receiver is in compliance with a Wi-Fi protocol.
5. The video signal generator of claim 3 , wherein said wireless receiver is in compliance with Bluetooth protocol.
6. The video signal generator of claim 3 , wherein said wireless receiver is in compliance with a GSM protocol.
7. The video signal generator of claim 1 , further comprising:
an external expansion circuit for transmitting an environment signal to said programmable microprocessor.
8. The video signal generator of claim 7 , wherein the environment signal is a temperature signal.
9. The video signal generator of claim 7 , wherein the environment signal is a vibration signal or a humidity signal.
10. The video signal generator of claim 1 , wherein said programmable microprocessor preloads a plurality of video pattern sets.
11. The video signal generator of claim 10 , further comprising:
a pattern switch for selecting and sending one of the video pattern sets to said television encoder.
12. The video signal generator of claim 10 , further comprising:
a download port connected to said programmable microprocessor so as to preload the video pattern sets.
13. The video signal generator of claim 10 , wherein the video pattern sets comprise RGB video patterns, random video patterns, and color bar video patterns.
14. The video signal generator of claim 1 , wherein said programmable microprocessor is a field programmable gate array.
15. The video signal generator of claim 1 , wherein the programmable microprocessor is a single-chip microprocessor.