US3842252A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical signal processing
Assignee: National Research Development Corp UK
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Filing: 1972-05-26
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Granted: 1974-10-15
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Expires: 1992-05-26
Abstract
Abstract A digital correlator operates on digital input signals to provide a correlation function which equals the true autocorrelation of the input signal under certain conditions. The correlator divides a digital signal into two channels one of which provides an output whenever a predetermined number of input pulses is succeeded in each of a succession of equal time intervals and delays the signal, both channels are then multiplied together to form the required correlation function. The correlator may be used in conjunction with a laser and photodetector to detect motion of particles within a liquid illuminated by the laser. In this way the diffusion co-efficient of the liquid may be determined.
Inventors
- 👤 C Oliver
- 👤 E Pike
- 👤 E Jakeman
- 👤 R Jones
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 03:23
CPC Classifications
G; G01; G01S; G01S17/00; G01S17/02; G01J; G01J3/00; G01J3/28; G01J3/44; G01J3/4412; G06; G06F; G06F17/00; G06F17/10; G06F17/15; G06G; G06G7/00; G06G7/12; G06G7/19; G06G7/1928; G06G7/1935; G01N; G01N15/00; G01N15/02; G01N15/0205; G01N15/0211; G01N2015/0216
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
141 words
A digital correlator comprising an input to which digital electrical pulses may be supplied, clock means for establishing a plurality of successive time intervals, means responsive to said input pulses and to said time interval establishing means for providing an output whenever a predetermined number of input pulses is exceeded in each of said time intervals, delay means for delaying said output signal, said delay means and said means for providing an output being operatively controlled by the clock signals from said clock means for establishing a plurality of successive time intervals, gate means for multiplying the digital pulse signals received by the input of the correlator with the delayed signals from said delay means, and recording means for receiving digital signals from the multiplying gate means to generate data representative of the correlation of digital signals applied to the correlator.
Claim 2
Dependent Claim
141 words
A digital correlator comprising an input to which digital electrical pulses may be supplied, clock means for establishing a plurality of successive time intervals, means responsive to said input pulses and to said time interval establishing means for providing an output whenever a predetermined number of input pulses is exceeded in each of said time intervals, delay means for delaying said output signal, said delay means and said means for providing an output being operatively controlled by the clock signals from said clock means for establishing a plurality of successive time intervals, gate means for multiplying the digital pulse signals received by the input of the correlator with the delayed signals from said delay means, and recording means for receiving digital signals from the multiplying gate means to generate data representative of the correlation of digital signals applied to the correlator.
Claim 3
Dependent Claim
220 words
A digital correlator for correlating incoming digital electrical signals comprising a clock for generating a series of digital electric signals evenly spaced apart in time, said digital electric signals establishing a plurality of successive time intervals, means responsive to said incoming digital electrical signals and to said clock signals for providing an output whenever a predetermined number of input pulses is exceeded in each of said time intervals, a shift register having an input connected to the output of said means for providing an output whenever a predetermined number of input pulses is exceeded, said shift register having a second input connected to said clock means, said shift register and said means for providing an output being operatively controlled by the clock signals from said clock, a plurality of gate means for multiplying the digital pulse signals received by the input of the correlator with the delayed signals from said shift register, each of said gate means having a first input connected to the output of a separate stage of said shift register and a second input to which incoming digital signals are applied, and recording means having a plurality of elements each separately connected to a separate output of one of said gate multiplying means to generate data representative of the correlation of digital signals applied to the correlator.
Claim 4
Dependent Claim
220 words
A digital correlator for correlating incoming digital electrical signals comprising a clock for generating a series of digital electric signals evenly spaced apart in time, said digital electric signals establishing a plurality of successive time intervals, means responsive to said incoming digital electrical signals and to said clock signals for providing an output whenever a predetermined number of input pulses is exceeded in each of said time intervals, a shift register having an input connected to the output of said means for providing an output whenever a predetermined number of input pulses is exceeded, said shift register having a second input connected to said clock means, said shift register and said means for providing an output being operatively controlled by the clock signals from said clock, a plurality of gate means for multiplying the digital pulse signals received by the input of the correlator with the delayed signals from said shift register, each of said gate means having a first input connected to the output of a separate stage of said shift register and a second input to which incoming digital signals are applied, and recording means having a plurality of elements each separately connected to a separate output of one of said gate multiplying means to generate data representative of the correlation of digital signals applied to the correlator.
Claim 5
Dependent Claim
42 words
A digital correlator as claimed in claim 2 in which said means responsive to said input pulses and to said time interval establishing means for providing an output whenever a predetermined number of input pulses is exceeded includes a set/reset bistable circuit.
Claim 6
Dependent Claim
66 words
A digital correlator as claimed in claim 2 further comprising an inhibiting gate for preventing incoming digital signals from reaching said means for providing an output when a predetermined number of input pulses is exceeded and from reaching the gate means during the application of pulses from said clock means to said means for providing an output whenever a predetermined number of input pulses is exceeded.
Claim 7
Dependent Claim
18 words
A digital correlator as claimed in claim 2 wherein the recording means is a plurality of digital counters.
References Cited (Backward Citations)
US3036775A
Cited
US3463911A
Cited
US3495077A
Cited
US3555258A
Cited
US3621220A
Cited
US3792245A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-14 | 1978-04-15 | 1978-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-14 | 1982-04-15 | 1982-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-14 | 1986-04-15 | 1986-10-15 | $7700.00 | Window Closed / Lapsed |