Bi-dimensional comb filter

Claim 2

An improved multi-dimensional comb filter system for separation of a predetermined type of data from spectrally interleaved types of data contained in a periodically recurrent signal having a plurality of integral differing periods including at least a first period and a second period, said system including: an input for receiving said recurrent signal having said spectrally interleaved data types; first comb filter means operating at said first period and connected to said input for first separation processing of said data type from the data types contained in said signal; second comb filter means operating at said second period and connected to said first comb filter means for second separation processing of said data type; delay matching means connected to said input for providing a delay to the signal corresponding to the sum of the first period and the second period; linear adder means connected to said second comb filter means and to said delay matching means for combining in phase the delayed signal passing through said delay matching means and the data type put out by the second comb filter means, said adder means including an output for putting out said data type which has been separated by multi-dimensional comb filtering of the signal.

Claim 3

The system set forth in claim 1 wherein the periodically recurrent signal comprises quadrature modulated color television.

Claim 4

3 . The system set forth in claim 2 wherein the color television signal follows the NTSC format and the first period corresponds to one of a picture frame and a picture scanning line, and the second period corresponds to the other thereof.

Claim 5

4 . The system set forth in claim 2 wherein the color television signal follows the PAL format and the first period corresponds to one of two picture frames and two picture scanning lines, and the second period corresponds to the other thereof.

Claim 6

The system set forth in claim 2 wherein the predetermined data type comprises chrominance.

Claim 7

The system set forth in claim 2 wherein the predetermined data type comprises luminance.

Claim 8

An improved multi-dimensional comb filter system for separation of chrominance and luminance information in a quadrature modulated color television signal comprising: an input for receiving the quadrature modulated color television signal; first comb filter means connected to the input and operating at a period related to one of picture frame and picture line, for separating a predetermined one of chrominance and luminance from the color television signal, second comb filter means connected to the first comb filter means and operating at the period related to the other of picture frame and picture line, for further separating the predetermined one of chrominance and luminance, delay matching means connected to the input for delay the color television signal corresponding to the predetermined one of chrominance and luminance put out by the second comb filter means by providing a delay corresponding to picture frame and picture line periods, linear adder means connected to the second comb filter means and to the delay matching means for combining in phase the delayed color television signal and the predetermined one of chrominance and luminance put out by the second comb filter means, said adder means including an output for putting out said predetermined one of chrominance and luminance which has been separated by multi-dimensional comb filtering of the color television signal.

Claim 9

An improved multi-dimensional comb filter system for separation of chrominance and luminance information in a quadrature modulated color television signal comprising: an input for receiving the quadrature modulated color television signal; first comb filter means connected to the input and operating at a period related to one of picture frame and picture line, for separating a predetermined one of chrominance and luminance from the color television signal, second comb filter means connected to the first comb filter means and operating at the period related to the other of picture frame and picture line, for further separating the predetermined one of chrominance and luminance, delay matching means connected to the input for delay the color television signal corresponding to the predetermined one of chrominance and luminance put out by the second comb filter means by providing a delay corresponding to picture frame and picture line periods, linear adder means connected to the second comb filter means and to the delay matching means for combining in phase the delayed color television signal and the predetermined one of chrominance and luminance put out by the second comb filter means, said adder means including an output for putting out said predetermined one of chrominance and luminance which has been separated by multi-dimensional comb filtering of the color television signal.

Claim 10

The system set forth in claim 7 wherein the predetermined one is chrominance.

Claim 11

The system set forth in claim 7 wherein the predetermined one is luminance.

Claim 12

The system set forth in claim 7 wherein said first comb filter means inherently provides a portion of the delay required to be provided by the delay matching means.

Claim 13

The system set forth in claim 10 wherein said first comb filter means operates at the period of a picture frame and comprises a portion of the delay matching means by delaying the analog color television signal by a picture frame delay portion of the overall picture frame and line period delay required.

Claim 14

The system set forth in claim 7 wherein the analog color television signal is in accordance with the NTSC format and the periods of the first and second comb filter means which are related to picture frame and picture line, are respectively periods corresponding to one picture frame and one picture line.

Claim 15

1 3 . The system set forth in claim 7 wherein the analog color television signal is in accordance with the PAL format and the periods of the first and second comb filter means which are related to picture frame and picture line, are respectively periods corresponding to two picture frames and two picture lines.

Claim 16

An improved bi-dimensional comb filter system for separating luminance information in a quadrature modulated color television signal comprising: first comb filter means operating at the period related to a picture frame and including an input for receiving the quadrature modulated color television signal, a first summing junction, a first n frame delay between the input and a first node, a second n frame delay between the first node and a first quarter amplitude gain factor amplifier having an output connected to the first summing junction, a first minus one half amplitude gain factor amplifier having an input connected to the first node and an output connected to the first summing junction, a second quarter amplitude gain factor amplifier having an input connected to the input and an output connected to the first summing junction (where n equals a whole integer), second comb filter means operating at the period related to a picture line and being connected to the first summing junction, the second comb filter means including: a second summing junction, a first n line delay between the output of the first summing junction and a third node, a second n line delay between the third node and a third quarter amplitude gain factor amplifier having an output connected to the second summing junction, a second minus one half amplitude gain factor amplifier having an input connected to the third node and an output connected to the second summing junction, a fourth quarter amplitude gain factor amplifier having an input connected to the output of the first summing junction and an output connected to the second summing junction (where n equals the whole integer), a third summing junction providing an output for putting out the bi-dimensionally combed chrominance, a minus unity gain amplifier connected between the output of the second summing junction and the input of the third summing junction, and an n line delay connected between the first node and the input of the third summing junction.

Claim 17

An improved bi-dimensional comb filter system for separating luminance information in a quadrature modulated color television signal comprising: first comb filter means operating at the period related to a picture frame and including an input for receiving the quadrature modulated color television signal, a first summing junction, a first n frame delay between the input and a first node, a second n frame delay between the first node and a first quarter amplitude gain factor amplifier having an output connected to the first summing junction, a first minus one half amplitude gain factor amplifier having an input connected to the first node and an output connected to the first summing junction, a second quarter amplitude gain factor amplifier having an input connected to the input and an output connected to the first summing junction (where n equals a whole integer), second comb filter means operating at the period related to a picture line and being connected to the first summing junction, the second comb filter means including: a second summing junction, a first n line delay between the output of the first summing junction and a third node, a second n line delay between the third node and a third quarter amplitude gain factor amplifier having an output connected to the second summing junction, a second minus one half amplitude gain factor amplifier having an input connected to the third node and an output connected to the second summing junction, a fourth quarter amplitude gain factor amplifier having an input connected to the output of the first summing junction and an output connected to the second summing junction (where n equals the whole integer), a third summing junction providing an output for putting out the bi-dimensionally combed chrominance, a minus unity gain amplifier connected between the output of the second summing junction and the input of the third summing junction, and an n line delay connected between the first node and the input of the third summing junction.

Claim 18

The system set forth in claim 14 wherein the quadrature modulated color television signal is in accordance with the NTSC format and n equals unity.

Claim 19

The system set forth in claim 14 wherein the quadrature modulated color television signal is in accordance with the PAL format and n equals two.

Claim 20

An improved bi-dimensional comb filter system for separating chrominance information in a quadrature modulated color television signal comprising: first comb filter means operating at the period related to a picture frame and including an input for receiving the quadrature modulated color television signal, a first summing junction, a first n frame delay between the input and a first node, a second n frame delay between the first node and a first quarter amplitude gain factor amplifier having an output connected to the first summing junction, a first one half amplitude gain factor amplifier having an input connected to the first node and an output connected to the first summing junction, a second quarter amplitude gain factor amplifier having an input connected to the input and an output connected to the first summing junction (where n equals a whole integer), second comb filter means operating at the period related to a picture line and being connected to the first summing junction, the second comb filter means including: a second summing junction, a first n line delay between the output of the first summing junction and a third node, a second n line delay between the third node and a third quarter amplitude gain factor amplifier having an output connected to the second summing junction, a second one half amplitude gain factor amplifier having an input connected to the third node and an output connected to the second summing junction, a fourth quarter amplitude gain factor amplifier having an input connected to the output of the first summing junction and an output connected to the second summing junction (where n equals the whole integer), a third summing junction providing an output for putting out the bi-dimensionally combed chrominance, a minus unity gain amplifier connected between the output of the second summing junction and the input of the third summing junction, and an n line delay connected between the first node and the input of the third summing junction.

Claim 21

An improved bi-dimensional comb filter system for separating chrominance information in a quadrature modulated color television signal comprising: first comb filter means operating at the period related to a picture frame and including an input for receiving the quadrature modulated color television signal, a first summing junction, a first n frame delay between the input and a first node, a second n frame delay between the first node and a first quarter amplitude gain factor amplifier having an output connected to the first summing junction, a first one half amplitude gain factor amplifier having an input connected to the first node and an output connected to the first summing junction, a second quarter amplitude gain factor amplifier having an input connected to the input and an output connected to the first summing junction (where n equals a whole integer), second comb filter means operating at the period related to a picture line and being connected to the first summing junction, the second comb filter means including: a second summing junction, a first n line delay between the output of the first summing junction and a third node, a second n line delay between the third node and a third quarter amplitude gain factor amplifier having an output connected to the second summing junction, a second one half amplitude gain factor amplifier having an input connected to the third node and an output connected to the second summing junction, a fourth quarter amplitude gain factor amplifier having an input connected to the output of the first summing junction and an output connected to the second summing junction (where n equals the whole integer), a third summing junction providing an output for putting out the bi-dimensionally combed chrominance, a minus unity gain amplifier connected between the output of the second summing junction and the input of the third summing junction, and an n line delay connected between the first node and the input of the third summing junction.

Claim 22

The system set forth in claim 17 wherein the quadrature modulated color television signal is in accordance with the NTSC format and n equals unity.

Claim 23

The system set forth in claim 17 wherein the quadrature modulated color television signal is in accordance with the PAL format and n equals two.