H - Electricity – 04 – N
Patent
H - Electricity
04
N
350/3
H04N 5/445 (2006.01) H04N 9/64 (2006.01)
Patent
CA 1207430
ABSTRACT OF THE DISCLOSURE Disclosed is an arrangement for combining video signals from two sources, for example a TV signal and a signal from a computer. Known arrange- ments of this type mute the first signal and then insert the second signal but, because of the response time of the muting circuitry, the composite picture displayed on a cathode ray tube is defective in that it includes a white or black band. In this invention, the output of a demodulator for the first signal is connected to a series circuit of a resistance and an open collector type inverter so that the resistance lowers the cutoff level of a transistor constituting a buffer amplifier to which the demodulated first video signal is fed. The operating point of the transistor is kept always in an active region so that startup of the transistor is rapid to enable high speed response of the buffer amplifier, thereby improving the quality of the composite picture displayed on the cathode ray tube.
448125
Fetherstonhaugh & Co.
Funai Electric Company Limited
LandOfFree
Video signal impose circuit does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Video signal impose circuit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Video signal impose circuit will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-1223451