System and Method for exciting advanced television signals

An exciter for digital televisions transmitters comprising:

• a data recovery circuit for receiving digital television signals including clock signals for transmission by the transmitter, the data recovery circuit extracts the data signals and the clock signals from the digital television signals to provide separate data signals and clock signals;
• a randomizer receiving the data signals from the data recovery circuit for altering the order of the data signals in accordance with digital television standards;
• a first encoder receiving the altered data signals from the randomizer for to encode the digital signals in packets;
• an interleaver receiving the packets of digital signals from the reed solomon encoder for perform a convolutional interleaving on the encoded digital signals;
• a second encoder receiving the convoluted digital signals from the interleaver for encoding the convoluted digital signals in accordance with digital television standards;
• a sync insert circuit receiving encoded digital signals from the second encoder for inserting sync signals within the digital signals;
• a filter receiving the combined digital signals from the sync insert circuit for limiting the spectrum of the combined digital signals in accordance to digital television standards, and
• a rate conversion circuit receiving clock signals and providing separate clock signals to the second encoder, sync insertion circuit and the filter related to the clock signals but adapted to be independent thereof in the event that the clock signals deviate beyond preset limits.

An exciter for digital televisions transmitters comprising:

• a data recovery circuit for receiving digital television signals including clock signals for transmission by the transmitter, the data recovery circuit extracts the data signals and the clock signals from the digital television signals to provide separate data signals and clock signals;
• a randomizer receiving the data signals from the data recovery circuit for altering the order of the data signals in accordance with digital television standards;
• a first encoder receiving the altered data signals from the randomizer for to encode the digital signals in packets;
• an interleaver receiving the packets of digital signals from the reed solomon encoder for performing a convolutional interleaving on the encoded digital signals;
• a second encoder receiving the convoluted digital signals from the interleaver for encoding the convoluted digital signals in accordance with digital television standards;
• a sync insert circuit receiving encoded digital signals from the second encoder for inserting sync signals within the digital signals;
• a filter receiving the combined digital signals from the sync insert circuit for limiting the spectrum of the combined digital signals in accordance to digital television standards,
• a digital to analog converter receiving the combination digital signals from the filter circuit for converting the combination digital signals to analog form, and
• a signal insert circuit connected between the filter circuit and the digital to analog converter for inserting a pilot signal into the combination digital signals.

An exciter circuit for receiving input television digital signals from a source and converting the television digital signals into a standard format for broadcasting by television transmitter power amplification stages via an antenna, the exciter circuit comprising:

• a data recovery circuit for extracting data and clock signals from the input television digital signal for outputting the extracted the digital clock signals for separately outputting the digital clock signals and the digital data signals;
• a randomizer circuit for altering the order of the extracted digital data signals in accordance to digital television standards;
• a encoder circuit for encoding the digital data signals into packets synchronized to receive the digital data signals at the input television digital signal rate;
• an interleaver circuit for performing a convolutional interleaving on the packets of digital data signals synchronized to receive packets of digital data signals at a second layer rate;
• an encoder circuit for encoding the convoluted interleaved digital data signals with a trellis code according to digital television standards;
• a sync insertion circuit for inserting segment and field sync signal into the encoded digital data signals;
• a filter circuit for limiting the spectrum of the encoded digital data signals to the standard digital television standard;
• a signal insertion circuit for inserting the extracted digital clock signal into the output of the filter circuit, and
• a digital to analog conversion circuit for converting the digital data signals and the digital clock signals into analog signals in form for transmission by the power amplifier stage.

A method of filtering a digital television transmission signal in an exciter comprising the steps of:

• (a) interpolating and upconverting the signal;
• (b) correcting the signal;
• (c) equalizing existing frequency response with an adaptive filter;
• and
• (d) down converting the signal.

A method of converting the television digital signals into a standard format for broadcasting by television transmitter power amplification stages via an antenna comprising the steps of:

• a) receiving an input televison digital signal having data and a clock signal;
• b) extracting data and clock signals from the input television digital signal;
• c) altering the order of the extracted digital data signals in accordance to digital television standards;
• d) encoding the digital data signals into packets synchronized to receive the digital data signals at the input television digital signal rate;
• e) performing a convolutional interleaving on the packets of digital data signals synchronized to receive packets of digital data signals at a second layer rate;
• f) encoding the convoluted interleaved digital data signals with a trellis code according to digital television standards;
• g) inserting segment and field sync signal into the encoded digital data signals;
• h) filtering the encoded digital data signals for limiting the spectrum of the encoded digital data signals to the standard digital television standard;
• i) inserting the extracted digital clock signal into the output of the filter circuit;
• and
• j) converting the digital data signals and the digital clock signals into analog signals in form for transmission by the power amplifier stage.