Information transmission during first-equalizing pulse interval in television
First Claim
1. A method comprising transmitting a standard television signal, and transmitting an additional information signal during the first equalizing pulse interval of said standard television signal by dividing said additional signal into first and second time intervals separated in time by the duration of an equalizing pulse.
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Accused Products
Abstract
A teletext system transmits auxiliary information before the vertical sync pulse in the vertical blanking interval to avoid interference to the normal transmitted picture. At the transmitter a time gap is placed in the auxiliary information to allow for the equalizing pulses, while at the receiver the gap is removed. One, two, or all three lines that occur before the vertical sync pulse in the vertical blanking interval can be used to transmit the auxiliary teletext information signals.
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Citations
10 Claims
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1. A method comprising transmitting a standard television signal, and transmitting an additional information signal during the first equalizing pulse interval of said standard television signal by dividing said additional signal into first and second time intervals separated in time by the duration of an equalizing pulse.
- 2. An apparatus comprising first means for transmitting a standard television signal, and second means for transmitting an additional information signal during the first equalizing pulse interval of said standard television signal, said second transmitting means comprising means for dividing said additional signal into first and second time intervals separated in time by the duration of an equalizing pulse.
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6. A method for receiving a standard television signal and an additional information signal occuring during the first equalizing pulse interval of said standard television signal, said method comprising juxtaposing together portions of said auxiliary signal that occur in one line of said first equalizing pulse interval and separated by the duration of an equalizing pulse.
- 7. An apparatus for receiving a standard television signal, an additional information signal occurring during first equalizing pulse interval, said apparatus comprising means for juxtaposing together portions of said auxiliary signal that occur in one line of said first equalizing pulse interval and separated by the duration of an equalizing pulse.
Specification