GB725321A - Electrical device for frequency comparison - Google Patents
Electrical device for frequency comparisonInfo
- Publication number
- GB725321A GB725321A GB5151/53A GB515153A GB725321A GB 725321 A GB725321 A GB 725321A GB 5151/53 A GB5151/53 A GB 5151/53A GB 515153 A GB515153 A GB 515153A GB 725321 A GB725321 A GB 725321A
- Authority
- GB
- United Kingdom
- Prior art keywords
- frequency
- standard
- amplifier
- supervised
- feb
- 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
- 230000035559 beat frequency Effects 0.000 abstract 3
- 239000000969 carrier Substances 0.000 abstract 1
- 238000005259 measurement Methods 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J1/00—Frequency-division multiplex systems
- H04J1/02—Details
- H04J1/06—Arrangements for supplying the carrier waves ; Arrangements for supplying synchronisation signals
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
Abstract
725,321. Frequency measurement. TELEFONAKTIEBOLAGET L. M. ERICSSON. Feb. 24, 1953 [Feb. 25, 1952], No. 5151/53. Class 37. In a device for supervising the frequencies of a multi-channel system in which the carriers are harmonics of a standard frequency but are not all derived from a common standard frequency oscillator, the output of a harmonic generator HG fed from a standard frequency generator is amplified in a linear amplifier F with one of the carrier currents to be supervised. The output of this amplifier is applied to a biased rectifier circuit (Fig. 1) in which the condenser C bypasses the HF components giving a demodulated signal across R at the beat frequency given by the carrier to be supervised and the harmonic from the standard oscillator nearest to it in frequency, any weak signal having been blocked by the bias voltage which also increases audibility of the beat frequency. The beat frequency is measured in a frequency meter fed by a low-frequency amplifier or aurally observed through a speaker.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE725321X | 1952-02-25 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB725321A true GB725321A (en) | 1955-03-02 |
Family
ID=20316096
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB5151/53A Expired GB725321A (en) | 1952-02-25 | 1953-02-24 | Electrical device for frequency comparison |
Country Status (3)
| Country | Link |
|---|---|
| DK (1) | DK84569C (en) |
| FR (1) | FR1071458A (en) |
| GB (1) | GB725321A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2814775A (en) * | 1954-03-19 | 1957-11-26 | Bell Telephone Labor Inc | Frequency setting and measuring system |
| DE1111285B (en) * | 1956-08-18 | 1961-07-20 | Siemens Ag | Circuit arrangement for frequency comparison of two voltages of different frequencies |
| DE1044270B (en) * | 1956-08-18 | 1958-11-20 | Siemens Ag | Circuit arrangement for the frequency-based comparison of two voltages with different frequencies |
-
1953
- 1953-02-19 DK DK57753A patent/DK84569C/en active
- 1953-02-24 GB GB5151/53A patent/GB725321A/en not_active Expired
- 1953-02-25 FR FR1071458D patent/FR1071458A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| DK84569C (en) | 1958-03-24 |
| FR1071458A (en) | 1954-09-01 |
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