GB1347573A - Electrical frequency processing apparatus and methods - Google Patents
Electrical frequency processing apparatus and methodsInfo
- Publication number
- GB1347573A GB1347573A GB1347573DA GB1347573A GB 1347573 A GB1347573 A GB 1347573A GB 1347573D A GB1347573D A GB 1347573DA GB 1347573 A GB1347573 A GB 1347573A
- Authority
- GB
- United Kingdom
- Prior art keywords
- frequency
- divider
- counter
- unknown
- count
- 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
- 230000001419 dependent effect Effects 0.000 abstract 2
- 238000005259 measurement Methods 0.000 abstract 2
- 230000000295 complement effect Effects 0.000 abstract 1
- 230000001351 cycling effect Effects 0.000 abstract 1
- 238000007789 sealing Methods 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K23/00—Pulse counters comprising counting chains; Frequency dividers comprising counting chains
- H03K23/76—Pulse counters comprising counting chains; Frequency dividers comprising counting chains using magnetic cores or ferro-electric capacitors
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
- G01R23/02—Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K23/00—Pulse counters comprising counting chains; Frequency dividers comprising counting chains
- H03K23/64—Pulse counters comprising counting chains; Frequency dividers comprising counting chains with a base or radix other than a power of two
- H03K23/66—Pulse counters comprising counting chains; Frequency dividers comprising counting chains with a base or radix other than a power of two with a variable counting base, e.g. by presetting or by adding or suppressing pulses
- H03K23/667—Pulse counters comprising counting chains; Frequency dividers comprising counting chains with a base or radix other than a power of two with a variable counting base, e.g. by presetting or by adding or suppressing pulses by switching the base during a counting cycle
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Measuring Frequencies, Analyzing Spectra (AREA)
Abstract
1347573 Frequency measurement; variable frequency dividers RACAL INSTRUMENTS Ltd 15 June 1972 [15 June 1971] 27860/71 Headings G4A and G4H The division factor of a variable frequency divider is set to a value inversely dependent on an unknown frequency and directly dependent on a fixed frequency which is also fed into the divider, whereby the output of the divider is a frequency which is a multiple of the unknown frequency. The higher frequency from the divider is counted, enabling a more accurate frequency measurement of the unknown lower frequency. In Fig. 2, ignoring the sealing produced by dividers 6, 12, the fixed frequency F is gated to counter 22, comprising stages 22A, 22B, for one period of the unknown frequency Fx. The most significant stage 22A of the counter 22 at the end of the counting period controls the division factor of divider 14A according to the count therein. The count in the lower significant stage 22B is inserted in complementary form into a comparator 30, which contains a cycling counter driven by the output of the divider 14A, whereby during counting from zero up to the count in stage 22B a one bit counter 26 is inserted to increase the division factor by one, the counter 26 being out of circuit for the rest of each cycle. The output frequency FO of the divider is then a fixed multiple of the input frequency Fx.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2786071 | 1972-06-15 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1347573A true GB1347573A (en) | 1974-02-27 |
Family
ID=10266494
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1347573D Expired GB1347573A (en) | 1972-06-15 | 1972-06-15 | Electrical frequency processing apparatus and methods |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1347573A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3641072A1 (en) * | 1985-12-06 | 1987-06-11 | Woodward Governor Co | METHOD AND CIRCUIT FOR MEASURING FREQUENCY |
-
1972
- 1972-06-15 GB GB1347573D patent/GB1347573A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3641072A1 (en) * | 1985-12-06 | 1987-06-11 | Woodward Governor Co | METHOD AND CIRCUIT FOR MEASURING FREQUENCY |
| GB2184306A (en) * | 1985-12-06 | 1987-06-17 | Woodward Governor Co | Frequency measurement |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |