US5126682A — Demodulation method and apparatus incorporating c…

Claim 1

Independent Claim 84 words

Demodulator apparatus for demodulating a data bearing broadcast signal, comprising means for receiving a broadcast signal and producing therefrom a predetermined intermediate carrier frequency having analog signals therein, a charge coupled device connected to receive said intermediate carrier frequency and having N active stages and tap weight means at each of said stages for entering a tap weight sequence to yield maximum correlation energy when a predetermined alignment occurs to thereby mark phase and frequency agreement between local timing signals and the received signals.

Claim 2

Dependent Claim 84 words

Demodulator apparatus for demodulating a data bearing broadcast signal, comprising means for receiving a broadcast signal and producing therefrom a predetermined intermediate carrier frequency having analog signals therein, a charge coupled device connected to receive said intermediate carrier frequency and having N active stages and tap weight means at each of said stages for entering a tap weight sequence to yield maximum correlation energy when a predetermined alignment occurs to thereby mark phase and frequency agreement between local timing signals and the received signals.

Claim 3

Dependent Claim 28 words

Demodulator apparatus as defined in claim 1 including an analog-to-digital converter connected to said charge coupled device for digitizing analog signals after passing through said charge coupled device.

Claim 4

Dependent Claim 213 words

Demodulator apparatus for demodulating a data bearing broadcast signal in the absence of mixers and without incurring quantization errors, comprising: a) means for receiving a broadcast signal and producing therefrom a predetermined intermediate carrier frequency (F IF ), b) charge coupled device connected to receive said intermediate carrier frequency F IF and having N active stages and tap weight means at each of said stages for entering a tap weight sequence to yield maximum correlation energy when desired alignment occurs to thereby mark phase and frequency agreement between local timing and the received signal, and the frequency F IF is: (N.sub.stage /4)(D.sub.R /2)(K)(1/α) where: N stage correspond to the number of active stages, D R / 2 and α defines the relationship between the number of active stages and symbol rate of the received signal, K 1 is a scaling factor which specifies the number of carrier cycles per four stage block and it is and odd integer ≧1, α denotes the portion of a symbol, that said transversal charge coupled device spans, c) means for sampling said intermediate frequency at a clock rate (F s ) of: ##EQU2## wherein F IF is said intermediate frequency and K is a scaling factor which is related to the number of carrier cycles per stage.

Claim 5

Dependent Claim 213 words

Demodulator apparatus for demodulating a data bearing broadcast signal in the absence of mixers and without incurring quantization errors, comprising: a) means for receiving a broadcast signal and producing therefrom a predetermined intermediate carrier frequency (F IF ), b) charge coupled device connected to receive said intermediate carrier frequency F IF and having N active stages and tap weight means at each of said stages for entering a tap weight sequence to yield maximum correlation energy when desired alignment occurs to thereby mark phase and frequency agreement between local timing and the received signal, and the frequency F IF is: (N.sub.stage /4)(D.sub.R /2)(K)(1/α) where: N stage correspond to the number of active stages, D R / 2 and α defines the relationship between the number of active stages and symbol rate of the received signal, K 1 is a scaling factor which specifies the number of carrier cycles per four stage block and it is and odd integer ≧1, α denotes the portion of a symbol, that said transversal charge coupled device spans, c) means for sampling said intermediate frequency at a clock rate (F s ) of: ##EQU2## wherein F IF is said intermediate frequency and K is a scaling factor which is related to the number of carrier cycles per stage.

Claim 6

Dependent Claim 33 words

The demodulator apparatus defined in claim 3 wherein said transversal filter is a charge coupled device having N stages having demodulator aliasing frequencies F ALS and said carrier frequency F IF is: ##EQU3##

Claim 7

Independent Claim 199 words

A method for demodulating a data bearing broadcast signal in the absence of mixers and without incurring quantization errors, comprising: a) receiving a broadcast signal and producing therefrom an intermediate carrier frequency (F IF ), b) providing a charge coupled device (CCD) having N active stages and tap weight means at each of said stages for entering a tap weight sequence to yield maximum correlation energy when desired alignment occurs to thereby mark phase and frequency agreement between local timing and the received signal, and the frequency of F IF is: (N.sub.stage /4)(D.sub.R /.sub.2)(K)(1/α) where: N stage correspond to the number of active stages, D R / 2 and α defines the relationship between the number of active stages and symbol rate of the received signal, K 1 is a scaling factor which specifies the number of carrier cycles per four stage block and it is and odd integer ≧1, α denotes the portion of a symbol that said transversal filter spans, c) sampling said intermediate frequency at a clock rate (F s ) of: ##EQU4## wherein F IF is said intermediate frequency and K 2 is a scaling factor related to the number of carrier cycles per stage.

Claim 8

Independent Claim 199 words

A method for demodulating a data bearing broadcast signal in the absence of mixers and without incurring quantization errors, comprising: a) receiving a broadcast signal and producing therefrom an intermediate carrier frequency (F IF ), b) providing a charge coupled device (CCD) having N active stages and tap weight means at each of said stages for entering a tap weight sequence to yield maximum correlation energy when desired alignment occurs to thereby mark phase and frequency agreement between local timing and the received signal, and the frequency of F IF is: (N.sub.stage /4)(D.sub.R /.sub.2)(K)(1/α) where: N stage correspond to the number of active stages, D R / 2 and α defines the relationship between the number of active stages and symbol rate of the received signal, K 1 is a scaling factor which specifies the number of carrier cycles per four stage block and it is and odd integer ≧1, α denotes the portion of a symbol that said transversal filter spans, c) sampling said intermediate frequency at a clock rate (F s ) of: ##EQU4## wherein F IF is said intermediate frequency and K 2 is a scaling factor related to the number of carrier cycles per stage.

Claim 9

Dependent Claim 30 words

The method defined in claim 5 wherein said charge coupled device (CCD) having N stages has a demodulation aliasing frequency F ALS and said carrier frequency F IF is: ##EQU5##

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1995-06-30	1995-12-30	1996-06-30	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1999-06-30	1999-12-30	2000-06-30	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2003-06-30	2003-12-30	2004-06-30	$7700.00	Window Closed / Lapsed

Demodulation method and apparatus incorporating charge coupled devices

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