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...http://www.google.fr/patents/US4335402?utm_source=gb-gplus-shareBrevet US4335402 - Information transmission during first-equalizing pulse interval in television
Information transmission during first-equalizing pulse interval in television
