ES2014083A6 - Frequency generators - Google Patents
Frequency generatorsInfo
- Publication number
- ES2014083A6 ES2014083A6 ES8901561A ES8901561A ES2014083A6 ES 2014083 A6 ES2014083 A6 ES 2014083A6 ES 8901561 A ES8901561 A ES 8901561A ES 8901561 A ES8901561 A ES 8901561A ES 2014083 A6 ES2014083 A6 ES 2014083A6
- Authority
- ES
- Spain
- Prior art keywords
- signal
- oscillator
- phase locked
- locked loop
- derived
- 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 - Fee Related
Links
- 230000002238 attenuated effect Effects 0.000 abstract 1
- 230000005540 biological transmission Effects 0.000 abstract 1
- 238000006243 chemical reaction Methods 0.000 abstract 1
- 229920000729 poly(L-lysine) polymer Polymers 0.000 abstract 1
- 230000002194 synthesizing effect Effects 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
- H03L7/0805—Details of the phase-locked loop the loop being adapted to provide an additional control signal for use outside the loop
-
- 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
- H03L7/16—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop
- H03L7/22—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using more than one loop
- H03L7/23—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using more than one loop with pulse counters or frequency dividers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/38—Transmitter circuitry for the transmission of television signals according to analogue transmission standards
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
- Radio Relay Systems (AREA)
Abstract
A high precision reference frequency usable for synthesizing the local oscillator frequencies of a transmission or re-transmission station especially in a TV grid network is derived from the received signal which may be heavily attenuated and modulated by a video signal and by the synchronization signals by first converting the received signal into an IF signal and eliminating the video signal in a fixed narrow band filter 22 and then the modulation and synchronization components in a first phase locked loop 24 to produce a signal which after frequency division at 25 is used to control via a second phase locked loop a pilot oscillator 18 producing the required output. The generator is adapted to handle signals corresponding to the French or the European-American standards by suitable frequency conversion twice at 9,21. Local oscillators 12, 12a are incorporated in PLLs responsive to an output of oscillator 18. The second phase locked loop is maintained in lock by a signal on line 240 even when input signal Fi fails. The input signal to first loop 24 may be derived instead from a stable reference oscillator via elements 31-33.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR8806027A FR2631180B1 (en) | 1988-05-05 | 1988-05-05 | BI-STANDARD FREQUENCY TRANSPOSITION GENERATOR, PARTICULARLY FOR TELEVISION MESH NETWORK |
Publications (1)
Publication Number | Publication Date |
---|---|
ES2014083A6 true ES2014083A6 (en) | 1990-06-16 |
Family
ID=9366009
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
ES8901561A Expired - Fee Related ES2014083A6 (en) | 1988-05-05 | 1989-05-05 | Frequency generators |
Country Status (7)
Country | Link |
---|---|
DE (1) | DE3914693A1 (en) |
ES (1) | ES2014083A6 (en) |
FR (1) | FR2631180B1 (en) |
GB (1) | GB2219157B (en) |
IT (1) | IT1233805B (en) |
NO (1) | NO891623L (en) |
SE (1) | SE8901293L (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2698221B1 (en) * | 1992-11-17 | 1995-07-21 | Erfatec | PILOT OSCILLATOR FOR TV TRANSMITTER AND TRANSMITTER. |
GB9505522D0 (en) * | 1995-03-18 | 1995-05-03 | Gen Electric Co Plc | Commodity consumption registering meters |
US6549242B1 (en) * | 1997-04-04 | 2003-04-15 | Harris Corporation | Combining adjacent TV channels for transmission by a common antenna |
CN104348537B (en) * | 2014-10-29 | 2017-09-26 | 成都锐新科技有限公司 | A kind of fast-forwarding system based on microwave equipment |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4571621A (en) * | 1983-06-15 | 1986-02-18 | Microband Corporation Of America | Television transmitter |
NL8500675A (en) * | 1985-03-11 | 1986-10-01 | Philips Nv | AM RECEIVER. |
US4817197A (en) * | 1986-07-18 | 1989-03-28 | Nippon Telegraph And Telephone Corporation | Mobile communication apparatus |
-
1988
- 1988-05-05 FR FR8806027A patent/FR2631180B1/en not_active Expired - Fee Related
-
1989
- 1989-04-11 SE SE8901293A patent/SE8901293L/en not_active Application Discontinuation
- 1989-04-20 NO NO89891623A patent/NO891623L/en unknown
- 1989-04-26 IT IT8983388A patent/IT1233805B/en active
- 1989-05-02 GB GB8910024A patent/GB2219157B/en not_active Expired - Fee Related
- 1989-05-03 DE DE3914693A patent/DE3914693A1/en active Granted
- 1989-05-05 ES ES8901561A patent/ES2014083A6/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
SE8901293L (en) | 1989-11-06 |
FR2631180B1 (en) | 1991-03-29 |
DE3914693A1 (en) | 1989-11-16 |
IT8983388A0 (en) | 1989-04-26 |
SE8901293D0 (en) | 1989-04-11 |
DE3914693C2 (en) | 1992-10-29 |
GB8910024D0 (en) | 1989-06-21 |
GB2219157B (en) | 1992-09-30 |
NO891623L (en) | 1989-11-06 |
GB2219157A (en) | 1989-11-29 |
IT1233805B (en) | 1992-04-17 |
FR2631180A1 (en) | 1989-11-10 |
NO891623D0 (en) | 1989-04-20 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
FD1A | Patent lapsed |
Effective date: 20000201 |