GB1208479A - Improvements in or relating to electronic synchronizing systems - Google Patents
Improvements in or relating to electronic synchronizing systemsInfo
- Publication number
- GB1208479A GB1208479A GB36706/68A GB3670668A GB1208479A GB 1208479 A GB1208479 A GB 1208479A GB 36706/68 A GB36706/68 A GB 36706/68A GB 3670668 A GB3670668 A GB 3670668A GB 1208479 A GB1208479 A GB 1208479A
- Authority
- GB
- United Kingdom
- Prior art keywords
- control
- pulses
- motor
- synchronism
- counter
- 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
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/32—Circuits or arrangements for control or supervision between transmitter and receiver or between image input and image output device, e.g. between a still-image camera and its memory or between a still-image camera and a printer device
- H04N1/36—Circuits or arrangements for control or supervision between transmitter and receiver or between image input and image output device, e.g. between a still-image camera and its memory or between a still-image camera and a printer device for synchronising or phasing transmitter and receiver
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P5/00—Arrangements specially adapted for regulating or controlling the speed or torque of two or more electric motors
- H02P5/46—Arrangements specially adapted for regulating or controlling the speed or torque of two or more electric motors for speed regulation of two or more dynamo-electric motors in relation to one another
- H02P5/52—Arrangements specially adapted for regulating or controlling the speed or torque of two or more electric motors for speed regulation of two or more dynamo-electric motors in relation to one another additionally providing control of relative angular displacement
- H02P5/56—Speed and position comparison between the motors by electrical means
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Control Of Stepping Motors (AREA)
- Facsimiles In General (AREA)
- Facsimile Scanning Arrangements (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
1,208,479. Automatic speed control. MAGNAVOX CO. Aug. 1, 1968 [Aug. 17, 1967], No. 36706/68. Heading G3R. In a system for synchronizing the drive motors of facsimile transmission equipment, the receiver drive motor is retroactively controlled until the phase error is reduced below a predetermined value and is thereafter driven by a constant frequency source. The motors are synchronous types and each drives a pulse generator whose output is indicative of the speed and position of the motor. The two pulse outputs are compared in a logic circuit 14 and a control signal generated in the form of a train of pulses whose width is a measure of the phase difference between the drive motors. This control signal is used to gate a counter 34 so that the counter is reset to zero at the beginning of each control pulse and then counts from a clock 32 for the duration of the control pulse. The value on the counter is read by a converter 35 which generates both a speed up and a slow down signal, each dependent upon the phase difference. The appropriate one of these is selected by a series of gates 36-39 and applied to a voltage controlled oscillator 17 feeding the receiver motor. When synchronism is achieved the control pulses disappear and a two stage counter 43 is enabled to begin counting pulses from the receiver pulse generator. When three consecutive control pulses have not appeared a selector 19 switches the motor supply from the voltage controlled oscillator 17 to a fixed frequency oscillator. In an alternative arrangement Fig. 6 (not shown), the control pulses are applied with other pulses from a crystal oscillator to an integrator the output of which controls the frequency of a voltage controlled oscillator feeding the receiver motor. When the control pulses diappear the voltage controlled oscillator continues to run, but in phase synchronism with the crystal oscillator so that no irregularity due to switching is introduced. A short while after synchronism is achieved or after a longer time even if synchronism is not achieved the control signal generator is blocked and thereafter the motor runs only under the control of the crystal oscillator.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US66139467A | 1967-08-17 | 1967-08-17 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1208479A true GB1208479A (en) | 1970-10-14 |
Family
ID=24653412
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB36706/68A Expired GB1208479A (en) | 1967-08-17 | 1968-08-01 | Improvements in or relating to electronic synchronizing systems |
Country Status (2)
Country | Link |
---|---|
DE (1) | DE1763809A1 (en) |
GB (1) | GB1208479A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4251836A (en) * | 1977-06-07 | 1981-02-17 | Etablissement Public De Diffusion Dit "Telediffusion De France" | System for broadcasting facsimile signals |
EP0374259A1 (en) * | 1988-04-19 | 1990-06-27 | Nakamura-Tome Precision Ind. Co., Ltd. | Two opposed main shaft type cnc lathe |
-
1968
- 1968-08-01 GB GB36706/68A patent/GB1208479A/en not_active Expired
- 1968-08-14 DE DE19681763809 patent/DE1763809A1/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4251836A (en) * | 1977-06-07 | 1981-02-17 | Etablissement Public De Diffusion Dit "Telediffusion De France" | System for broadcasting facsimile signals |
EP0374259A1 (en) * | 1988-04-19 | 1990-06-27 | Nakamura-Tome Precision Ind. Co., Ltd. | Two opposed main shaft type cnc lathe |
EP0374259B1 (en) * | 1988-04-19 | 1995-10-18 | Nakamura-Tome Precision Ind. Co., Ltd. | Two opposed main shaft type cnc lathe |
Also Published As
Publication number | Publication date |
---|---|
DE1763809A1 (en) | 1972-02-24 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PLE | Entries relating assignments, transmissions, licences in the register of patents | ||
PLNP | Patent lapsed through nonpayment of renewal fees |