H - Electricity – 04 – N
Patent
H - Electricity
04
N
350/26
H04N 7/167 (2006.01) H04N 7/171 (2006.01)
Patent
CA 1292056
Abstract of the Disclosure A transmitter encoder has a gain selector for compressing the level of a horizontal sync signal com- ponent of a video intermediate frequency (IF) signal to scramble it, and an AM modulation degree controller for superposing a control signal, which indicates the timing for the level compression, on an FM audio IF signal in the form of AM modulation. The transmitter encoder further has an oscillator circuit for generating a sine wave with a horizontal frequency (fH) and an nfH sine wave having a frequency n times the horizontal fre- quency, and a mixer for mixing these sine waves to thereby provide the above control signal. A receiver decoder has an AM detector for detecting an AM component of the FM audio IF signal from the transmitter encoder to reproduce a composite signal and band filters for respectively extracting the fH and nfH sine waves from the reproduced composite signal. The receiver decoder further has a gain selector for expanding the compressed level of the horizontal sync signal component of the video IF signal from the transmitter encoder, by means of a sync expansion pulse generated on the basis of the fH sine wave.
576681
Kuroiwa Watru
Maeda Jyoji
Masuko Akinori
Tanaka Masatoshi
Uehara Shouji
Kabushiki Kaisha Toshiba
Marks & Clerk
Toshiba Audio Video Engineering Co. Ltd.
LandOfFree
Video signal scrambling system 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 scrambling system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Video signal scrambling system will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-1180007