CN1053983A - Realize medium wave, shortwave, frequency modulation, the synchronized broadcasting of TV common frequency source with TV signal - Google Patents
Realize medium wave, shortwave, frequency modulation, the synchronized broadcasting of TV common frequency source with TV signal Download PDFInfo
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- CN1053983A CN1053983A CN 90100630 CN90100630A CN1053983A CN 1053983 A CN1053983 A CN 1053983A CN 90100630 CN90100630 CN 90100630 CN 90100630 A CN90100630 A CN 90100630A CN 1053983 A CN1053983 A CN 1053983A
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- frequency
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- synchronized broadcasting
- medium wave
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- Synchronizing For Television (AREA)
- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
Abstract
The common frequency source lift-off technology is to receive same video line rate (or frame frequency, also can send out a frequency in addition) to change through frequency translation, difference on the frequency and do the transmitter frequency source after changing.Thereby (highly stable crystal) frequency of oscillation source and calibrating frequency work on the existing transmitter have been cancelled.That can realize the common frequency source radio transmission and not need calibrating frequency with it and can make two synchronized broadcasting interstation frequency deviation Δ f=OH
2(medium wave, short frequency system and phase place system) synchronized broadcasting frequency deviation index.
Description
Though the frequency deviation index of current medium wave, shortwave synchronized broadcasting its be frequency system synchronized broadcasting or phase place system synchronized broadcasting all be to follow the tracks of mark by the high stability crystal oscillator on each synchronized broadcasting transmitter to carry out calibrating frequency or phase-locked giving security frequently, as figure one, existing medium wave, shortwave synchronized broadcasting transmitter high stability crystal oscillator and mark frequency phase demodulation loop schematic diagram.Even in current quality phase place system synchronized broadcasting preferably, its random phase difference and phase jitter all are inevitable.TV synchronized broadcasting is according in July, 1987 (broadcasting technology), Japan shakes with rubidium to steal device for the transmitter frequency source, its precision and stability are all good, robber's device can not be just the same but the rubidium on the synchronous broadcast transmitter of each TV shakes, and therefore also will carry out regular debugging and adjustment work to transmitter.
The main distinction of common frequency source synchronized broadcasting and existing synchronized broadcasting is the frequency source of transmitter.Work such as high stability crystal oscillator source on the transmitter (or rubidium shake robber source) and calibrating frequency adjustment have been cancelled in common frequency source synchronized broadcasting; Be after frequency translation, to do the transmitter frequency source with same video line rate (or frame frequency, colored carrier frequency, clock mark are frequently, also can send out a frequency in addition).
As figure two, medium wave.Shortwave common frequency source synchronized broadcasting emission schematic diagram.The frequency source of transmitter gets after the frequency changer conversion from external same video line rate.Its frequency translation is with line frequency Fv(or frame frequency), frequency multiplication m or frequency division n conversion such as frequency multiplication again is as with line frequency doubly 72 times, i.e. Fvm=15625 * 72=1125KH
2, the frequency of Here it is medium wave the 67th channel.Generally be that line frequency is become 1KH
2Or 9KH
2(9KH
2Only be used for medium wave) fundamental frequency Fk, promptly
Fv ÷ n * m=Fk=1KH
2(or 9KH
2).
Fv * m ÷ n=Fk=1KH
2(or 9KH
2).
And then be medium wave, short-wave transmitter frequency with the Fk frequency multiplication.
The frequency of frequency modulation common frequency source synchronized broadcasting transmitter, be derived from external same video line rate (also can add and send out a superaudio) and get after frequency translation and difference frequency conversion in the synchronized broadcasting programme signal of self broadcasting, its difference frequency difference changes changes mode with the synchronized broadcasting of TV common frequency source.
The synchronized broadcasting of TV common frequency source is to become the synchronous broadcast transmission frequency of TV with the line frequency (or frame frequency) in self TV signal (or external same TV signal) after conversion.Method has:
I transmits next TV signal line frequency (or frame frequency) Fv frequency multiplication m one-tenth transmission of television unit frequency FR with satellite or other modes
Fv±m＝F
R
Its method of synchronization is identical with aforementioned (also promptly with the existing phase place system of China) medium wave synchronized broadcasting.
2, the frequency Fs that the TV signal source emission is come takes out line frequency (or frame frequency) Fv frequency multiplication m to F
1〉=16MH
2After again difference frequency to A, B two steps platform tranmitting frequency F
R, as figure below:
If Fs is TV first channel, then F
RBe the 3rd channel.
3, as figure three a, b TV common frequency source synchronized broadcasting emission schematic diagram.The frequency of transmitter is derived from self TV signal line frequency and changes through frequency translation and difference and get after changing.M among the figure
ABBe that difference is changeed the directional relay transfer station, with open circuit or closed circuit transmission all can, be to receive A place signal to send the B place to, TV signal that mustn't the B place is fed back.E
ABIt is the equifield intensity district of A, B two synchronous interstations.
TV synchronized broadcasting ghost image occurs in the equifield intensity district, can transfer L, C circuit parameter on aerial position and the machine, and ghost image is overlapped.
The teaching relational expression that the difference frequency difference is changeed: the tranmitting frequency of establishing A, B two synchronous platforms is F
R
F
R+F
T＝F
n
F
n+F
T＝（F
R+F
T）±F
T＝F
R
F
R: the transmission of television frequency
F
T: become by video line rate, equal two television channel interbody spacer frequencies, at Chinese F
T〉=16MH
2Gao Yi,
F
n: be F
RAnd F
TDifference frequency, be M among figure three a
ABThe frequency that the A platform sends to the B platform is received at the relay transmission station.
If establish F
2=F
3
F then
3+ F
T=F
1(or F
5)
F
1(or F
5) ± F
1=(F
3+ F
T) ± F
Y=F
3
F
1, F
1, F
5Be TV the 3rd, the first, the 5th channel frequency.
Current synchronized broadcasting frequency deviation does not have special-purpose monitoring machine, with the monitoring machine of common frequency source frequency transform techniques system, and as figure four, medium wave, shortwave synchronized broadcasting frequency deviation monitoring assembling instrument schematic diagram.Can monitor the frequency deviation index of China's current medium wave, short frequency and the synchronized broadcasting of phase place system.(annotate: common frequency source synchronized broadcasting frequency deviation is △ f=OH forever
2, need not monitor)
Claims (3)
1, this common frequency source lift-off technology has been cancelled (highly stable crystal) frequency of oscillation source on the existing transmitter, be to receive same video line rate (or amplitude-frequency, colored carrier frequency, clock mark are frequently, also can send out a frequency in addition) to change through frequency translation and difference on the frequency and do the transmitter frequency source after changing.
2, can realize the common frequency source radio transmission with 1 and not need medium wave, shortwave, the frequency modulation of calibrating frequency, TV is synchronized broadcasting frequently altogether.
3,, can monitor the frequency deviation index of China's current medium wave, shortwave synchronized broadcasting with 1 monitoring machine of making.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90100630 CN1053983A (en) | 1990-02-08 | 1990-02-08 | Realize medium wave, shortwave, frequency modulation, the synchronized broadcasting of TV common frequency source with TV signal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90100630 CN1053983A (en) | 1990-02-08 | 1990-02-08 | Realize medium wave, shortwave, frequency modulation, the synchronized broadcasting of TV common frequency source with TV signal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1053983A true CN1053983A (en) | 1991-08-21 |
Family
ID=4876733
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 90100630 Pending CN1053983A (en) | 1990-02-08 | 1990-02-08 | Realize medium wave, shortwave, frequency modulation, the synchronized broadcasting of TV common frequency source with TV signal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1053983A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2725860A1 (en) * | 1994-10-17 | 1996-04-19 | Telediffusion Fse | METHOD AND SYSTEM FOR SYNCHRONIZATION OF A TELECOMMUNICATION NETWORK |
-
1990
- 1990-02-08 CN CN 90100630 patent/CN1053983A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2725860A1 (en) * | 1994-10-17 | 1996-04-19 | Telediffusion Fse | METHOD AND SYSTEM FOR SYNCHRONIZATION OF A TELECOMMUNICATION NETWORK |
| WO1996012360A1 (en) * | 1994-10-17 | 1996-04-25 | Telediffusion De France | Common-wave telecommunication network synchronisation method and system |
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| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |