GB1089373A - Improvements in or relating to apparatus for comparing the frequencies of electrical signals - Google Patents
Improvements in or relating to apparatus for comparing the frequencies of electrical signalsInfo
- Publication number
- GB1089373A GB1089373A GB2836864A GB2836864A GB1089373A GB 1089373 A GB1089373 A GB 1089373A GB 2836864 A GB2836864 A GB 2836864A GB 2836864 A GB2836864 A GB 2836864A GB 1089373 A GB1089373 A GB 1089373A
- Authority
- GB
- United Kingdom
- Prior art keywords
- frequencies
- frequency
- difference
- relating
- comparing
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
- G01R23/005—Circuits for comparing several input signals and for indicating the result of this comparison, e.g. equal, different, greater, smaller (comparing phase or frequency of 2 mutually independent oscillations in demodulators)
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Frequencies, Analyzing Spectra (AREA)
Abstract
1,089,373. Frequency discriminators. GENERAL ELECTRIC CO. Ltd. and D. L. CLAY. July 9, 1965 [July 9, 1964], No. 28368/64. Heading H3A. The difference between approximately equal frequencies #1 and #2 is measured by deriving pulses at these frequencies and using them to sample higher non-related frequencies (which may be the same frequency #3) thereby deriving two beat frequencies which are compared by mixing in a modulator 6 and counting the cycles of the difference frequency. If #3 = a# 1 + #<SP>1</SP> = a# 2 + #<SP>11</SP> the beat frequencies derived by sampling are #<SP>1</SP> and #<SP>11</SP>, so the difference frequency #<SP>1</SP>-#<SP>11</SP> = (# 3 -a# 1 )-(# 3 -a# 2 ) = a(# 2 - # 1 ). The difference frequency has thus been multiplied by a factor a, which may be 100, -without any frequency multiplication, and the accuracy is increased in the same ratio. In a modification, the reference frequency # 3 is a sawtooth wave; consequently the beat frequencies are also sawtooth waves which may be compared as in Specification 1,089,372.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2836864A GB1089373A (en) | 1964-07-09 | 1964-07-09 | Improvements in or relating to apparatus for comparing the frequencies of electrical signals |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2836864A GB1089373A (en) | 1964-07-09 | 1964-07-09 | Improvements in or relating to apparatus for comparing the frequencies of electrical signals |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1089373A true GB1089373A (en) | 1967-11-01 |
Family
ID=10274551
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2836864A Expired GB1089373A (en) | 1964-07-09 | 1964-07-09 | Improvements in or relating to apparatus for comparing the frequencies of electrical signals |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1089373A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114878910A (en) * | 2022-07-13 | 2022-08-09 | 中国科学技术大学 | High-precision frequency measurement method, device and system based on beat sampling |
-
1964
- 1964-07-09 GB GB2836864A patent/GB1089373A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114878910A (en) * | 2022-07-13 | 2022-08-09 | 中国科学技术大学 | High-precision frequency measurement method, device and system based on beat sampling |
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