US5627592A — Start code for signalling bits

Claim 1

Independent Claim 131 words

A method for encoding an extended television signal comprising the steps: generating signalling bits for conveying control information to control an extended decoder; inserting the signalling bits into an extended television signal; and providing said extended television signal with said signalling bits for transmission; wherein the signalling bits comprise a start code and data bits, the start code having a main lobe of spectral energy residing in a lower spectral area of a baseband television signal, said lower spectral area having a maximum frequency below 2 MHz, the start code having an amplitude dip at zero frequency, and the start code having minimum predetermined aperiodic correlation properties and a predetermined minimum bit Hamming distance to the data bits when shifted in the direction of the data bits following the start code.

Claim 2

Independent Claim 131 words

A method for encoding an extended television signal comprising the steps: generating signalling bits for conveying control information to control an extended decoder; inserting the signalling bits into an extended television signal; and providing said extended television signal with said signalling bits for transmission; wherein the signalling bits comprise a start code and data bits, the start code having a main lobe of spectral energy residing in a lower spectral area of a baseband television signal, said lower spectral area having a maximum frequency below 2 MHz, the start code having an amplitude dip at zero frequency, and the start code having minimum predetermined aperiodic correlation properties and a predetermined minimum bit Hamming distance to the data bits when shifted in the direction of the data bits following the start code.

Claim 3

Dependent Claim 25 words

A method for encoding an extended television signal as claimed in claim 1, wherein the start code has an amplitude dip at said maximum frequency.

Claim 4

Dependent Claim 47 words

A method for encoding an extended television signal as claimed in claim 1, wherein the signalling bits further comprise a run-in preceding the start code, and the start code has a predetermined minimum bit Hamming distance to the run-in when shifted in the direction of the run-in.

Claim 5

Dependent Claim 106 words

A method for encoding an extended television signal as claimed in claim 1, wherein the signalling bits further comprise a run-in preceding the start code, wherein the start code is based on a bit sequence of a first length and has a first minimum bit Hamming distance to said run-in, and wherein the combination of a last part of the run-in together with the start code is based on a bit sequence of a second length exceeding said first length, said combination having a second minimum bit Hamming distance to said run-in, and said second minimum bit Hamming distance exceeding said first minimum bit Hamming distance.

Claim 6

Dependent Claim 56 words

A method for encoding an extended television signal as claimed in claim 4, wherein the start code has a third minimum bit Hamming distance to said data bits, and wherein said combination has a fourth minimum bit Hamming distance to said data bits, said fourth minimum bit Hamming distance exceeding said third minimum bit Hamming distance.

Claim 7

Dependent Claim 68 words

A method for encoding an extended television signal as claimed in claim 1, wherein the start code is based on a Barker sequence of a first length, and wherein the signalling bits further comprise a run-in preceding the start code, the combination of a last part of the run-in together with the start code being based on a Barker sequence of a second length exceeding said first length.

Claim 8

Dependent Claim 35 words

A method for encoding an extended television signal as claimed in claim 1, wherein the start code includes a sequence being code modulated in a manner deviating from the code modulation of the data bits.

Claim 9

Dependent Claim 22 words

A method for encoding an extended television signal as claimed in claim 7, wherein said sequence is (1E 3C1F) in hexadecimal notation.

Claim 10

Dependent Claim 29 words

A method for encoding an extended television signal as claimed in claim 8, wherein the signalling bits further comprise a run-in whose last bits are (000111) in binary notation.

Claim 11

Dependent Claim 26 words

A method for encoding an extended television signal as claimed in claim 1, wherein the signalling bits further comprise a run-in having at least eight transients.

Claim 12

Dependent Claim 163 words

An extended television signal decoder, comprising: means coupled to receive an extended television signal comprising image data, signalling bits for conveying control information to control processing operations with regard to said image data, and synchronizing information, for deriving said synchronizing information from said extended television signal; means coupled to receive said synchronizing information for selecting a signalling bits window; means coupled to receive said extended television signal for decoding said signalling bits during said signalling bits window; wherein the signalling bits comprise a start code and data bits, and wherein the start code's main lobe of spectral energy resides in the lower spectral area of a baseband television signal, said lower spectral area having a maximum frequency below 2 MHz, the start code having a local spectral minimum at DC, and the start code having predetermined minimum aperiodic correlation properties and a predetermined minimum bit Hamming distance to the data bits when shifted towards or over the data bits following the start code.

Claim 13

Dependent Claim 163 words

An extended television signal decoder, comprising: means coupled to receive an extended television signal comprising image data, signalling bits for conveying control information to control processing operations with regard to said image data, and synchronizing information, for deriving said synchronizing information from said extended television signal; means coupled to receive said synchronizing information for selecting a signalling bits window; means coupled to receive said extended television signal for decoding said signalling bits during said signalling bits window; wherein the signalling bits comprise a start code and data bits, and wherein the start code's main lobe of spectral energy resides in the lower spectral area of a baseband television signal, said lower spectral area having a maximum frequency below 2 MHz, the start code having a local spectral minimum at DC, and the start code having predetermined minimum aperiodic correlation properties and a predetermined minimum bit Hamming distance to the data bits when shifted towards or over the data bits following the start code.

Claim 14

Dependent Claim 29 words

An extended television decoder as claimed in claim 11, wherein said signalling bits decoding means is preceded by a low-pass filter having a cut-off frequency at said maximum frequency.

Claim 15

Dependent Claim 54 words

An extended television decoder as claimed in claim 11, wherein said signalling bits decoding means is preceded by a low-pass filter having a spectral minimum at the color subcarrier frequency and an impulse response approximating a frequency domain representation of an elementary pulse EP=cos 2 (n/2*t/(200 ns)) when -200 ns≦t≦+200 ns, and EP=0 elsewhere.

Claim 16

Dependent Claim 45 words

An extended television decoder as claimed in claim 11, wherein said signalling bits decoding means (5, 11, 13) are preceded by a low-pass filter having a (1 2 2 1) or (2 3 4 4 3 2) impulse response at a 13.5 MHz sample rate.

Claim 17

Dependent Claim 36 words

An extended television decoder as claimed in claim 11, wherein said signalling bits decoding means comprises a start code detector operative during a start code timing window having a timing tolerance of at least ±4 μs.

Claim 18

Dependent Claim 48 words

An extended television decoder as claimed in claim 11, wherein said signalling bits further comprise a run-in preceding said start code, and said signalling bits decoding means comprises a start code detector arranged for detecting a combination of said start code and a last part of said run-in.

Claim 19

Dependent Claim 34 words

An extended television decoder as claimed in claim 11, wherein said signalling bits decoding means comprises a start code detector arranged for detecting a start code sequence which is (1E 3C1F) in hexadecimal notation.

Claim 20

Dependent Claim 55 words

An extended television decoder as claimed in claim 11, wherein said signalling bits decoding means comprises a start code detector comprising: means for determining whether a first plurality of bits has been correctly received; means for determining whether, among a second plurality of bits, at least a predetermined number of bits is free from error.

Claim 21

Dependent Claim 40 words

An extended television decoder as claimed in claim 11, wherein said start code detector further comprises: means for determining whether said second plurality of bits contains a bit pair around a transient, both bits of said bit pair being inverted.

Claim 22

Independent Claim 160 words

A method of decoding an extended television signal, comprising the steps of: receiving an extended television signal comprising image data, signalling bits for conveying control information to control processing operations with regard to said image data, and synchronizing information, for deriving said synchronizing information from said extended television signal; selecting a signalling bits window in dependence on said synchronizing information; decoding said signalling bits during said signalling bits window in response to said extended television signal; wherein the signalling bits comprise a start code and data bits, the start code's main lobe of spectral energy residing in the lower spectral area of a baseband television signal, said lower spectral area having a maximum frequency below 2 MHz, the start code having a local spectral minimum at DC, and the start code having predetermined minimum aperiodic correlation properties and a predetermined minimum bit Hamming distance to the data bits when shifted towards or over the data bits following the start code.

Claim 23

Independent Claim 160 words

A method of decoding an extended television signal, comprising the steps of: receiving an extended television signal comprising image data, signalling bits for conveying control information to control processing operations with regard to said image data, and synchronizing information, for deriving said synchronizing information from said extended television signal; selecting a signalling bits window in dependence on said synchronizing information; decoding said signalling bits during said signalling bits window in response to said extended television signal; wherein the signalling bits comprise a start code and data bits, the start code's main lobe of spectral energy residing in the lower spectral area of a baseband television signal, said lower spectral area having a maximum frequency below 2 MHz, the start code having a local spectral minimum at DC, and the start code having predetermined minimum aperiodic correlation properties and a predetermined minimum bit Hamming distance to the data bits when shifted towards or over the data bits following the start code.

Claim 24

Dependent Claim 25 words

A method for encoding an extended television signal as claimed in claim 1, wherein the maximum frequency of the lower spectral area equals 1.7 MHz.

Claim 25

Dependent Claim 53 words

A method for encoding an extended television signal as claimed in claim 1, wherein said minimum predetermined aperiodic correlation properties comprises the aperiodic correlation of the start code, normalized to a global maximum of one at zero delay, showing a difference of at least one-half between the global maximum and any local maxima.

Claim 26

Dependent Claim 21 words

An extended television decoder as claimed in claim 11, wherein the maximum frequency of the lower spectral area equals 1.7 MHz.

Claim 27

Dependent Claim 49 words

An extended television decoder as claimed in claim 11, wherein said minimum predetermined aperiodic correlation properties comprises the aperiodic correlation of the start code, normalized to a global maximum of one at zero delay, showing a difference of at least one-half between the global maximum and any local maxima.

Claim 28

Dependent Claim 25 words

A method of decoding an extended television signal as claimed in claim 20, wherein the maximum frequency of the lower spectral area equals 1.7 MHz.

Claim 29

Dependent Claim 53 words

A method of decoding an extended television signal as claimed in claim 20, wherein said minimum predetermined aperiodic correlation properties comprises the aperiodic correlation of the start code, normalized to a global maximum of one at zero delay, showing a difference of at least one-half between the global maximum and any local maxima.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	2000-05-05	2000-11-04	2001-05-06	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	2004-05-05	2004-11-04	2005-05-06	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2008-05-05	2008-11-04	2009-05-06	$7700.00	Window Closed / Lapsed

Start code for signalling bits

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