US3646432A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for measuring the loss or gain coefficient of a transmission medium
Assignee: KDDI Corp
•
Filing: 1970-05-14
•
Granted: 1972-02-29
•
Expires: 1990-05-14
Abstract
Abstract A system for measuring the infinitesimal transmission coefficient of a transmission medium in which a measuring signal is repeatedly passed through the transmission medium, such as a cable or the like, so that the infinitesimal transmission coefficient of the transmission medium is magnified in proportion to the number of repeating cycles of the measuring signal in the transmission medium up to a value sufficient to be readily and precisely measured.
Inventors
- 👤 Taiichiro Nakai
- 👤 Hiroshi Sakaki
- 👤 Masanori Sato
- 👤 Hiroshi Yuguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:29
CPC Classifications
G; G01; G01R; G01R27/00; G01R27/28
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
239 words
A system for measuring a small transmission coefficient of a transmission medium, comprising: input terminal means for receiving a measuring signal, combiner means having first and second inputs and an output, wherein said first input is connected to the input terminal means, branch circuit means having an input and first and second outputs for branching an input signal to said two outputs thereof, switch means connected between said combiner means and branch circuit means for selectively connecting said combiner means output directly to said branch circuit means input or connecting said combiner means output to said branch circuit means input through a transmission medium to be measured, modifier circuit means connected between said first output of the branch circuit means and the second input of the combiner means to modify the measured signal circulating in a loop, which is formed by the combiner; the switch means; selectively, the transmission medium; the branch circuit means; and the modifier circuit means; so as to obtain at the second output of the branch circuit means a modified measuring signal including identifying information representative of the number of circulating cycles of the measuring signal in said loop, detecting means connected to the second output of the branch means to detect the modified measuring signal in response to the identifying information, and level meter means connected to the detecting means for measuring the level of the modified measuring signal detected by the detecting means.
Claim 2
Independent Claim
239 words
A system for measuring a small transmission coefficient of a transmission medium, comprising: input terminal means for receiving a measuring signal, combiner means having first and second inputs and an output, wherein said first input is connected to the input terminal means, branch circuit means having an input and first and second outputs for branching an input signal to said two outputs thereof, switch means connected between said combiner means and branch circuit means for selectively connecting said combiner means output directly to said branch circuit means input or connecting said combiner means output to said branch circuit means input through a transmission medium to be measured, modifier circuit means connected between said first output of the branch circuit means and the second input of the combiner means to modify the measured signal circulating in a loop, which is formed by the combiner; the switch means; selectively, the transmission medium; the branch circuit means; and the modifier circuit means; so as to obtain at the second output of the branch circuit means a modified measuring signal including identifying information representative of the number of circulating cycles of the measuring signal in said loop, detecting means connected to the second output of the branch means to detect the modified measuring signal in response to the identifying information, and level meter means connected to the detecting means for measuring the level of the modified measuring signal detected by the detecting means.
Claim 3
Dependent Claim
68 words
A measuring system according to claim 1 wherein the modifier circuit means is a frequency converter for shifting the frequency of the input signal thereof, as received from the first output of the branch circuit means, by a predetermined frequency so as to obtain the modified measuring signal including the identifying information indicated in the signal configuration of frequency-information, and wherein the detecting means includes a frequency selector.
Claim 4
Dependent Claim
65 words
A measuring system according to claim 1, wherein the modifier circuit means is a delay circuit for delaying the input signal thereof, as received form the first output of the branch circuit means, by a predetermined time so as to obtain the modified measuring signal including the identifying information indicated in the signal configuration of time-information, and wherein the detecting means includes a time gate.
Claim 5
Dependent Claim
84 words
A measuring system as set forth in claim 1, further comprising a device having a known loss characteristic, and In which said switch means comprises first and second switches, and means for connecting said known loss device and said transmission medium to said first and second switches for permitting selective coupling of said known loss device and said transmission medium in said loop, wherein a difference can be measured by said level meter means known loss and the transmission coefficient of the transmission medium.
Claim 6
Dependent Claim
68 words
A measuring system according to claim 4, wherein the modifier circuit means is a frequency converter for shifting the frequency of the input signal thereof, as received from the first output of the branch circuit means, by a predetermined frequency so as to obtain the modified measuring signal including the identifying information indicated in the signal configuration of frequency-information, and wherein the detecting means includes a frequency selector.
Claim 7
Dependent Claim
66 words
A measuring system according to claim 4, wherein the modifier circuit means is a delay circuit for delaying the input signal thereof, as received from the first output of the branch circuit means, by a predetermined time so as to obtain the modified measuring signal including the identifying information indicated in the signal configuration of time-information , and wherein the detecting means includes a time gate.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-02-28 | 1975-08-30 | 1976-02-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-28 | 1979-08-30 | 1980-02-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-28 | 1983-08-30 | 1984-02-29 | $7700.00 | Window Closed / Lapsed |