Patent US3836735A successfully refreshed from Google Patents.
US3836735A
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Telephone line characteristic measuring instrument
Assignee: Individual
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Filing: 1972-10-16
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Granted: 1974-09-17
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Expires: 1992-10-16
Abstract
Abstract There is disclosed a telephone line characteristic measuring instrument which provides separate indications of the amplitude modulation, phase modulation and uncorrelated noise interference on a transmitted test tone. In my copending application Ser. No. 270,953, there is disclosed an instrument for subtracting a generated tone from the received signal; the three parameters of interest are represented in the difference signal. In the present invention, the difference signal is sampled at three different times during each half cycle of the test tone and the three sequences of samples, after filtering, peak detection and arithmetic combination, provide separate indications of the three parameters of interest.
Inventors
- 👤 F Bradley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:27
CPC Classifications
H; H04; H04B; H04B3/00; H04B3/02; H04B3/46
Claims Analysis
Total Claims: 37
Claim 1
Independent Claim
95 words
A system for determining functions of a(t), b(t) and c(t) from an input signal of the form a(t)cos(wt) + b(t)sin(wt) + c(t), where a(t), b(t) and C(t) are functions of time, comprising means for sampling periodically said signal at at least three points during cycles of cos(wt), means connected to said sampling means for operating on respective sequences of samples taken at the three respective points in said cycles to derive respective outputs, and means connected to said operating means for selectively combining the outputs thereof to derive said functions of a(t), b(t) and c(t).
Claim 2
Independent Claim
95 words
A system for determining functions of a(t), b(t) and c(t) from an input signal of the form a(t)cos(wt) + b(t)sin(wt) + c(t), where a(t), b(t) and C(t) are functions of time, comprising means for sampling periodically said signal at at least three points during cycles of cos(wt), means connected to said sampling means for operating on respective sequences of samples taken at the three respective points in said cycles to derive respective outputs, and means connected to said operating means for selectively combining the outputs thereof to derive said functions of a(t), b(t) and c(t).
Claim 3
Dependent Claim
3 words
B(t) + C(t)
Claim 4
Dependent Claim
3 words
B(t) + C(t)
Claim 5
Dependent Claim
29 words
A system in accordance with claim 1 wherein said three points in said cycles are separated by multiples of 45* and said operating means derives three outputs as follows:
Claim 6
Dependent Claim
3 words
B(t) + C(t)
Claim 7
Dependent Claim
3 words
B(t) + C(t)
Claim 8
Dependent Claim
72 words
.707(A(t) + B(t)) + C(t) where A(t), B(t) and C(t) are respective functions of a(t), b(t) and c(t), and wherein said combining step includes the sub-steps of adding the first and second outputs, subtracting the third output from the added outputs multiplied by .707 and multiplying the difference by 1/.414 to derive C(t), subtracting C(t) from the first output to derive A(t), and subtracting C(t) from the second output to derive B(t).
Claim 9
Dependent Claim
72 words
.707(A(t) + B(t)) + C(t) where A(t), B(t) and C(t) are respective functions of a(t), b(t) and c(t), and wherein said combining step includes the sub-steps of adding the first and second outputs, subtracting the third output from the added outputs multiplied by .707 and multiplying the difference by 1/.414 to derive C(t), subtracting C(t) from the first output to derive A(t), and subtracting C(t) from the second output to derive B(t).
Claim 10
Dependent Claim
48 words
A system in accordance with claim 2 wherein said sampling means includes means for detecting zero crossings in three control signals cos(wt), sin(wt) and cos(wt) + sin(wt), and a respective sampling circuit responsive to zero crossings in each of said three control signals for sampling said input signal.
Claim 11
Dependent Claim
76 words
.707(A(t) + B(t))+ C(t) where A(t), B(t) and C(t) are respective functions of a(t), b(t) and c(t), and wherein said combining means includes means for adding the first and second outputs, means for subtracting the third output from the added outputs multiplied by .707 and multiplying the difference by 1/.414 to derive C(t), means for subtracting C(t) from the first output to derive A(t), and means for subtracting C(t) from the second output to derive B(t).
Claim 12
Dependent Claim
76 words
.707(A(t) + B(t))+ C(t) where A(t), B(t) and C(t) are respective functions of a(t), b(t) and c(t), and wherein said combining means includes means for adding the first and second outputs, means for subtracting the third output from the added outputs multiplied by .707 and multiplying the difference by 1/.414 to derive C(t), means for subtracting C(t) from the first output to derive A(t), and means for subtracting C(t) from the second output to derive B(t).
Claim 13
Dependent Claim
38 words
A system in accordance with claim 3 wherein said operating means includes a respective filtering and peak-detecting means for operating on the samples of each of said sampling circuits to derive a respective one of said three outputs.
Claim 14
Dependent Claim
34 words
A system in accordance with claim 4 wherein said input signal is a notched-noise transmitted test tone, a(t) is the incidental amplitude modulation, b(t) is the incidental phase modulation, and c(t) is uncorrelated noise.
Claim 15
Dependent Claim
48 words
A system in accordance with claim 1 wherein said sampling means includes means for detecting zero crossings in three control signals cos(wt), sin(wt) and cos(wt) + sin(wt), and a respective sampling circuit responsive to zero crossings in each of said three control signals for sampling said input signal.
Claim 16
Dependent Claim
37 words
A system in accordance with claim 6 wherein said operating means includes a respective filtering and peak-detecting means for operating on the samples of each of said sampling circuits to derive a respective one of three outputs.
Claim 17
Dependent Claim
34 words
A system in accordance with claim 6 wherein said input signal is a notched-noise transmitted test tone, a(t) is the incidental amplitude modulation, b(t) is the incidental phase madulation, and c(t) is uncorrelated noise.
Claim 18
Dependent Claim
34 words
A system in accordance with claim 1 wherein said input signal is a notched-noise transmitted test tone, a(t) is the incidental amplitude modulation, b(t) is the incidental phase modulation, and c(t) is uNcorrelated noise.
Claim 19
Independent Claim
82 words
A method for determining functions of a(t), b(t) and c(t) from an input signal of the form a(t)cos(wt) + b(t)sin(wt) + c(t), where a(t), b(t) and c(t) are functions of time, comprising the steps of sampling periodically said signal at at least three points during cycles of cos(wt), operating on respective sequences of samples taken at the three respective points in said cycles to generate three outputs, and selectively combining the generated outputs for deriving said functions of a(t), b(t) and c(t).
Claim 20
Independent Claim
82 words
A method for determining functions of a(t), b(t) and c(t) from an input signal of the form a(t)cos(wt) + b(t)sin(wt) + c(t), where a(t), b(t) and c(t) are functions of time, comprising the steps of sampling periodically said signal at at least three points during cycles of cos(wt), operating on respective sequences of samples taken at the three respective points in said cycles to generate three outputs, and selectively combining the generated outputs for deriving said functions of a(t), b(t) and c(t).
Claim 21
Dependent Claim
27 words
A method in accordance with claim 10 wherein said three points in said cycles are separated by multiples of 45* and said three outputs are as follows:
Claim 22
Dependent Claim
48 words
A method in accordance with claim 10 wherein said sampling step includes the sub-steps of detecting zero crossings in three control signals cos(wt), sin(wt) and cos(wt) + sin(wt), and controlling a respective sampling sequence responsive to the detection of zero crossings in each of said three control signals.
Claim 23
Dependent Claim
36 words
A method in accordance with claim 10 wherein said operating step includes the sub-steps of filtering and peak-detecting the samples in each of the three sample sequences to generate a respective one of said three outputs.
Claim 24
Dependent Claim
34 words
A method in accordance with claim 10 wherein said input signal is a notched-noise transmitted test tone, a(t) is the incidental amplitude modulation, b(t) is the incidental phase modulation, and c(t) is uncorrelated noise.
Claim 25
Independent Claim
76 words
A method for determining functions of a(t) and b(t) from an input signal of the form a(t)cos(wt) + b(t)sin(wt), where a(t) and b(t) are functions of time, comprising the steps of sampling periodically said signal at times corresponding to minimum and maximum values of the absolute magnitude of cos(wt), and processing respective sequences of samples taken at respective times in said cycles to derive said functions of a(t) and b(t) from the respective sequences of samples.
Claim 26
Independent Claim
76 words
A method for determining functions of a(t) and b(t) from an input signal of the form a(t)cos(wt) + b(t)sin(wt), where a(t) and b(t) are functions of time, comprising the steps of sampling periodically said signal at times corresponding to minimum and maximum values of the absolute magnitude of cos(wt), and processing respective sequences of samples taken at respective times in said cycles to derive said functions of a(t) and b(t) from the respective sequences of samples.
Claim 27
Dependent Claim
45 words
A method in accordance with claim 15 wherein said sampling step includes the sub-steps of detecting zero crossings in two control signals cos(wt) and sin(wt) and controlling a respective sampling sequence responsive to the detection of zero crossings in each of said two control signals.
Claim 28
Dependent Claim
39 words
A method in accordance with claim 16 wherein said processing step includes the sub-step of filtering and peak-detecting the samples in each of the two sample sequences to generate a respective one of said functions of a(t) and b(t).
Claim 29
Dependent Claim
30 words
A method in accordance with claim 17 wherein said input signal is a notched-noise transmitted test tone, a(t) is the incidental amplitude modulation and b(t) is the incidental phase modulation.
Claim 30
Dependent Claim
39 words
A method in accordance with claim 15 wherein said processing step includes the sub-steps of filtering and peak-detecting the samples in each of the two sample sequences to generate a respective one of said functions of a(t) and b(t).
Claim 31
Dependent Claim
30 words
A method in accordance with claim 15 wherein said input signal is a notched-noise transmitted test tone, a(t) is the incidental amplitude modulation and b(t) is the incidental phase modulation.
Claim 32
Independent Claim
76 words
A method for determining functions of a(t) and n(t) from an input signal of the form a(t)cos(wt) + n(t) where a(t) and n(t) are functions of time, comprising the steps of sampling periodically said signal at times corresponding to minimum and maximum values of the absolute magnitude of cos(wt), and processing respective sequences of samples taken at respective times in said cycles to derive said functions of a(t) and n(t) from the respective sequences of samples.
Claim 33
Independent Claim
76 words
A method for determining functions of a(t) and n(t) from an input signal of the form a(t)cos(wt) + n(t) where a(t) and n(t) are functions of time, comprising the steps of sampling periodically said signal at times corresponding to minimum and maximum values of the absolute magnitude of cos(wt), and processing respective sequences of samples taken at respective times in said cycles to derive said functions of a(t) and n(t) from the respective sequences of samples.
Claim 34
Dependent Claim
50 words
A method in accordance with claim 21 wherein said sampling step includes the sub-steps of detecting zero crossings in a control signal cos(wt), and controlling a respective sampling sequence responsive to the detection of zero crossings at times corresponding to minimum and maximum values of the absolute magnitude of cos(wt).
Claim 35
Dependent Claim
39 words
A method in accordance with claim 21 wherein said processing step includes the sub-steps of filtering and peak-detecting the samples in each of the two sample sequences to generate a respective one of said functions of a(t) and n(t).
Claim 36
Independent Claim
25 words
A method in accordance with 23 wherein said input signal is a notched-noise transmitted test tone, a(t) is incidental modulation and n(t) is uncorrelated noise.
Claim 37
Independent Claim
25 words
A method in accordance with 23 wherein said input signal is a notched-noise transmitted test tone, a(t) is incidental modulation and n(t) is uncorrelated noise.
References Cited (Backward Citations)
US3526842A
Cited
US3546440A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-16 | 1978-03-18 | 1978-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-16 | 1982-03-18 | 1982-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-16 | 1986-03-18 | 1986-09-17 | $7700.00 | Window Closed / Lapsed |