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US3792245A
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Double-scaled autocorrelator
Assignee: Massachusetts Institute of Technology
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Filing: 1972-08-21
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Granted: 1974-02-12
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Expires: 1992-08-21
Abstract
Abstract A double-scaled autocorrelator which includes means for eliminating spurious correlations which occur in the system because of the double scaling. The autocorrelator system includes a pulse shaper to receive an incoming signal. In one system, the pulse shaper is connected to a pulse processor comprising a single presettable scaler which is preset each clock period by a random court generator, thereby removing spurious correlations. In another system, the pulse shaper is connected to a pulse processor comprising two phase-independent scalers to perform that function. The system contains a shift register connected to receive as one input the output of the scaler (or the first of the two scalers), the output of each unit of the shift register being connected as an input to a clocked multiplier another input to which is derived from the scaler (or the second of the two scalers). The system further includes a plurality of counters, each to receive as an input an output from one of the multipliers. Furthermore, the system may include provision to subtract from each counter the input to the last counter, and it may include provision for clocking the channels at successively slower rates.
Inventors
- 👤 L Hocker
- 👤 I Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:27
CPC Classifications
G; G06; G06F; G06F17/00; G06F17/10; G06F17/15
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
154 words
A double-scaled autocorrelator that comprise in combination: a pulse shaper to receive an input signal; a pulse processor connected to receive as input thereto the output of the pulse shaper and having a first output and a second output, said pulse processor being operable to eliminate the spurious correlation that arises between the first and second outputs due to double scaling; a shift register having successive outputs, connected to receive as an input thereto the first output from the pulse processor; a plurality of multipliers each connected to receive as a first input thereto the second output from the pulse processor and to receive as a second input thereto the corresponding successive outputs from the shift register; a plurality of counters each to receive as an input thereto an output from its corresponding multiplier and the plurality of multipliers; and A clock connected to effect proper timing of the cooperative elements of the autocorrelator.
Claim 2
Dependent Claim
154 words
A double-scaled autocorrelator that comprise in combination: a pulse shaper to receive an input signal; a pulse processor connected to receive as input thereto the output of the pulse shaper and having a first output and a second output, said pulse processor being operable to eliminate the spurious correlation that arises between the first and second outputs due to double scaling; a shift register having successive outputs, connected to receive as an input thereto the first output from the pulse processor; a plurality of multipliers each connected to receive as a first input thereto the second output from the pulse processor and to receive as a second input thereto the corresponding successive outputs from the shift register; a plurality of counters each to receive as an input thereto an output from its corresponding multiplier and the plurality of multipliers; and A clock connected to effect proper timing of the cooperative elements of the autocorrelator.
Claim 3
Dependent Claim
105 words
A double-scaled autocorrelator as claimed in claim 1 in which the pulse processor comprises a first scaler connected to receive as input thereto the output of the pulse shaper, a first accumulator connected to receive as input the output of the first scaler and having as output the first output of the pulse processor, a second scaler connected to receive as input the output of the pulse shaper, and a second accumulator connected to receive as input the output of the second scaler and having as output the second output of the pulse processor, the two scalers having different scale factors to assure phase independence.
Claim 4
Dependent Claim
91 words
A double-scaled autocorrelator as claimed in claim 2 in which the pulse processor has an offset connected to receive as input the output of the pulse shaper and having two outputs, one output of the offset being connected as input to the first scaler and the other output of the offset being connected as input to the second scaler, which offset has zero output from the time it is initialized until a number of pulses has been applied to its input and which passes all subsequent pulses until it is re-initialized.
Claim 5
Dependent Claim
95 words
A double-scaled autocorrelator as claimed in claim 2 in which the pulse processor has first and second offsets, one offset having as input the output of the first scaler and having its output connected as input to the first accumulator and the other offset having as input the output of the second scaler and having its output connected as input to the second accumulator, each offset having zero output from the time it is initialized until a number of pulses has been applied to its input and passing all subsequent pulses until it is re-initialized.
Claim 6
Dependent Claim
90 words
A double-scaled autocorrelator as claimed in claim 1 in which the pulse processor comprises a presettable input scaler connected to receive as input the output of the pulse shaper, the spurious correlation due to double scaling being eliminated by a random count generator connected to preset the input scaler and adapted to the preset the input scaler whenever the random-count generator is clocked; and an accumulator having as input the output of the presettable input scaler and having as identical outputs the first and second outputs of the pulse processor.
Claim 7
Dependent Claim
64 words
A double-scaled autocorrelator as claimed in claim 5 having an offset connected to receive as input the output of the pulse shaper and having its output connected as input to the scaler, which offset has zero output from the time it is initialized until a number of pulses has been applied to its input, and which passes all subsequent pulses until it is re-initialized.
Claim 8
Dependent Claim
61 words
Apparatus as claimed in claim 5 with an offset having as its input the output of the scaler and having its output connected as input to the accumulator, said offset having zero output from the time it is initialized until a predetermined number of pulses has been applied to its input and which passes all subsequent pulses until it is re-initialized.
Claim 9
Dependent Claim
40 words
A double-scaled autocorrelator as claimed in claim 1 that further includes a last-channel subtractor comprising means to subtract the output of the last multiplier of the plurality of multipliers form the input to all counters of the plurality of counters.
Claim 10
Dependent Claim
36 words
Apparatus as claimed in claim 1 having a last-channel subtractor comprising means to subtract the second input to the last multiplier of the plurality of multipliers from the second input to all the other multipliers thereof.
Claim 11
Dependent Claim
34 words
A double-scaled autocorrelator as claimed in claim 1 in which the shift register comprises a plurality of sub-registers connected in cascade and wherein said clock is connected to a clock input of each sub-register.
Claim 12
Dependent Claim
150 words
A double-scaled autocorrelator as claimed in claim 10 which includes a plurality of divider circuits, the output of the clock being connected as an input to the clock input of the first sub-register of the cascade of the sUb-registers and as input to the first divider circuit, said divider circuit having its output connected to the clock input of the second sub-register of the cascade of sub-registers and also as input to the second divider circuit of the plurality of divider circuits, each successive divider circuit of the plurality of divider circuits each having as its input the output of the next preceding divider circuit and having its output connected to the clock input of the next successive sub-register of the cascade of sub-registers and, except for the last divider circuit of the plurality of divider circuits, as input to the next divider circuit of the plurality of divider circuits.
Claim 13
Dependent Claim
27 words
A double-scaled autocorrelator as claimed in claim 11 in which the divider circuits are operable to divide by any number of a set of numbers, including one.
Claim 14
Dependent Claim
146 words
A double-scaled autocorrelator that comprises, in combination: a pulse processor connected to receive an input signal and having a first output and a second output, said pulse processor being operable to eliminate the spurious correlation between the first output and the second output due to double scaling; a shift register having successive outputs, connected to receive as an input thereto the first output from the pulse processor; a plurality of multipliers each connected to receive as a first input thereto the second output from the pulse processor and to receive as a second input thereto the corresponding successive outputs from the shift register; a plurality of counters each to receive as an input thereto an output from its corresponding multiplier of the plurality of multipliers; and a clock connected in the circuit of the autocorrelator to effect proper timing of the interacting elements of the combination.
Claim 15
Dependent Claim
146 words
A double-scaled autocorrelator that comprises, in combination: a pulse processor connected to receive an input signal and having a first output and a second output, said pulse processor being operable to eliminate the spurious correlation between the first output and the second output due to double scaling; a shift register having successive outputs, connected to receive as an input thereto the first output from the pulse processor; a plurality of multipliers each connected to receive as a first input thereto the second output from the pulse processor and to receive as a second input thereto the corresponding successive outputs from the shift register; a plurality of counters each to receive as an input thereto an output from its corresponding multiplier of the plurality of multipliers; and a clock connected in the circuit of the autocorrelator to effect proper timing of the interacting elements of the combination.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-11 | 1977-08-13 | 1978-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-11 | 1981-08-13 | 1982-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-11 | 1985-08-13 | 1986-02-12 | $7700.00 | Window Closed / Lapsed |