GB853960A - Improvements in or relating to phase control circuits - Google Patents
Improvements in or relating to phase control circuitsInfo
- Publication number
- GB853960A GB853960A GB5747/56A GB574756A GB853960A GB 853960 A GB853960 A GB 853960A GB 5747/56 A GB5747/56 A GB 5747/56A GB 574756 A GB574756 A GB 574756A GB 853960 A GB853960 A GB 853960A
- Authority
- GB
- United Kingdom
- Prior art keywords
- filter
- control
- oscillations
- resistor
- series
- 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
- 230000010355 oscillation Effects 0.000 abstract 7
- 239000003990 capacitor Substances 0.000 abstract 1
- 230000001419 dependent effect Effects 0.000 abstract 1
- 238000009499 grossing Methods 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L7/00—Automatic control of frequency or phase; Synchronisation
- H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
- H03L7/08—Details of the phase-locked loop
- H03L7/10—Details of the phase-locked loop for assuring initial synchronisation or for broadening the capture range
- H03L7/107—Details of the phase-locked loop for assuring initial synchronisation or for broadening the capture range using a variable transfer function for the loop, e.g. low pass filter having a variable bandwidth
- H03L7/1075—Details of the phase-locked loop for assuring initial synchronisation or for broadening the capture range using a variable transfer function for the loop, e.g. low pass filter having a variable bandwidth by changing characteristics of the loop filter, e.g. changing the gain, changing the bandwidth
Landscapes
- Processing Of Color Television Signals (AREA)
Abstract
853,960. Automatic phase control systems. ELECTRIC & MUSICAL INDUSTRIES Ltd. Feb. 21, 1957 [Feb. 24, 1956], No. 5747/56. Class 40(5). In an automatic phase control circuit, e.g. for a colour television receiver, comprising an oscillator, a discriminator for comparing the phase of the oscillations generated by the oscillator with the phase of control oscillations so as to generate a control voltage dependent on the phase difference between the generated oscillations and the control oscillations, the control voltage being fed via a smoothing filter to the oscillator so as to maintain the generated oscillations in a predetermined phase relationship with the control oscillations, the filter comprises a series resistance and shunt capacitance and is provided with at least one additional element having a non-linear response to the control voltage so that when the control voltage is of small amplitude the bandwidth of filter is small, and when the control voltage is of larger amplitude the bandwidth of the filter is increased to allow a more rapid control of the generated oscillations. In one embodiment, Fig. 3 (not shown) the series resistor of the filter is shunted by a non-linear resistor, and in a further embodiment Fig. 4 (not shown) the series resistor is shunted by two diodes, which are connected in parallel but in opposite directions. In a further arrangement, Fig. 5, the filter consists of the series resistor 7, and the shunt capacitor 8 which is in series with a resistor 9. A pair of diodes 13, 14, are connected in series with the resistor 9 and biased to be normally conducting, the arrangement being such that when the voltage across the resistor 7 exceeds a predetermined positive or negative valve one or other of the diodes is rendered non-conductive so that the shunt circuit of the filter is disconnected from earth whereby the bandwidth of the filter is increased. Reference has been directed by the Comptroller to Specification. 636,575.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB5747/56A GB853960A (en) | 1956-02-24 | 1956-02-24 | Improvements in or relating to phase control circuits |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB5747/56A GB853960A (en) | 1956-02-24 | 1956-02-24 | Improvements in or relating to phase control circuits |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB853960A true GB853960A (en) | 1960-11-16 |
Family
ID=9801899
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB5747/56A Expired GB853960A (en) | 1956-02-24 | 1956-02-24 | Improvements in or relating to phase control circuits |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB853960A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3329888A (en) * | 1965-03-18 | 1967-07-04 | Honeywell Inc | Alteration of a signal's cross over point to effect phase shift |
| DE3127267A1 (en) * | 1981-07-10 | 1983-01-27 | Moto Meter Ag, 7250 Leonberg | "DIGITAL FREQUENCY CONVERTER ARRANGEMENT, IN PARTICULAR FOR VEHICLE TACHOMETERS" |
| GB2123229A (en) * | 1982-06-28 | 1984-01-25 | Gen Electric | Control circuits for phase locked loops |
| US4563651A (en) * | 1981-04-28 | 1986-01-07 | Oki Electric Industry Co., Ltd. | FM Demodulator with variable bandpass filter |
-
1956
- 1956-02-24 GB GB5747/56A patent/GB853960A/en not_active Expired
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3329888A (en) * | 1965-03-18 | 1967-07-04 | Honeywell Inc | Alteration of a signal's cross over point to effect phase shift |
| US4563651A (en) * | 1981-04-28 | 1986-01-07 | Oki Electric Industry Co., Ltd. | FM Demodulator with variable bandpass filter |
| DE3127267A1 (en) * | 1981-07-10 | 1983-01-27 | Moto Meter Ag, 7250 Leonberg | "DIGITAL FREQUENCY CONVERTER ARRANGEMENT, IN PARTICULAR FOR VEHICLE TACHOMETERS" |
| GB2123229A (en) * | 1982-06-28 | 1984-01-25 | Gen Electric | Control circuits for phase locked loops |
| US4506233A (en) * | 1982-06-28 | 1985-03-19 | General Electric Company | Bandwidth control circuit for a phase locked loop |
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