GB1115064A - Procedure for measuring group delay-time - Google Patents
Procedure for measuring group delay-timeInfo
- Publication number
- GB1115064A GB1115064A GB2147065A GB2147065A GB1115064A GB 1115064 A GB1115064 A GB 1115064A GB 2147065 A GB2147065 A GB 2147065A GB 2147065 A GB2147065 A GB 2147065A GB 1115064 A GB1115064 A GB 1115064A
- Authority
- GB
- United Kingdom
- Prior art keywords
- frequency
- delay
- group delay
- output
- circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/46—Monitoring; Testing
- H04B3/462—Testing group delay or phase shift, e.g. timing jitter
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Measurement Of Resistance Or Impedance (AREA)
- Measurement Of Unknown Time Intervals (AREA)
Abstract
1, 115, 064. Group delay measurement. TAVKOZLESI KUTATO INTEZET. May 20, 1965 [May 20, 1964], No.21470/65. Heading G1U. In an arrangement for measuring group delay time, a varied frequency is transmitted through the network under test and at the receiver is passed into two channels in one of which it is delayed. The outputs from the two channels are compared in phase, and since the delay has the effect of giving one output a frequency shift relative to the other at any given instant (since the frequency of the input to the system is continuously changing) this phase difference represents the group delay at each instant. Signals from a fixed frequency generator 1 and a wobbulator 2 are mixed at 3 and passed to the network X under test. The output from X is converted to an I. F. frequency at 5 by mixing with a signal from a generator 6 varied in accordance with the wobbulater 2. The I. F. signal is passed to a buffer circuit 7 which passes it directly to a phase difference measuring circuit 8 and also to a delay 9 whose output provides the other input to the circuit 8. The output from the phase difference circuit 8 passes via a channel switch 9 to be displayed on an oscillograph 14 which is calibrated by frequency markers derived through a channel 4. Calibration of the system is achieved through a separate phase adjusting, measuring and delay system 10, 11, 12.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| HUTA000821 | 1964-05-20 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1115064A true GB1115064A (en) | 1968-05-22 |
Family
ID=11001711
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2147065A Expired GB1115064A (en) | 1964-05-20 | 1965-05-20 | Procedure for measuring group delay-time |
Country Status (3)
| Country | Link |
|---|---|
| AT (1) | AT264655B (en) |
| DE (1) | DE1516327A1 (en) |
| GB (1) | GB1115064A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2018500A1 (en) * | 1968-09-20 | 1970-05-29 | Solartron Electronic Group |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2066883A1 (en) * | 1969-10-23 | 1971-08-13 | Thomson Csf | |
| US3968427A (en) * | 1975-08-11 | 1976-07-06 | Hewlett-Packard Company | Group delay measurement apparatus and method |
-
1965
- 1965-05-17 AT AT447365A patent/AT264655B/en active
- 1965-05-18 DE DE19651516327 patent/DE1516327A1/en active Pending
- 1965-05-20 GB GB2147065A patent/GB1115064A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2018500A1 (en) * | 1968-09-20 | 1970-05-29 | Solartron Electronic Group |
Also Published As
| Publication number | Publication date |
|---|---|
| DE1516327A1 (en) | 1972-02-17 |
| AT264655B (en) | 1968-09-10 |
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