CN1219367C - Method for compensating multi-point delay of signal - Google Patents
Method for compensating multi-point delay of signal Download PDFInfo
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- CN1219367C CN1219367C CN 00105048 CN00105048A CN1219367C CN 1219367 C CN1219367 C CN 1219367C CN 00105048 CN00105048 CN 00105048 CN 00105048 A CN00105048 A CN 00105048A CN 1219367 C CN1219367 C CN 1219367C
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Abstract
The present invention relates to a method for compensating multi-point delay of signals, which belongs to broadcast communication technologies. Fm waves are delayed and corrected with glass delay lines in a lower frequency channel by the method, and a central station is used for transmitting the fm waves and fixed frequency of the same reference source. Then, the fm waves and the fixed frequency are treated through frequency mixing, time delay and frequency mixing to obtain transmitting waves, or the fm waves and the fixed frequency are transmitted after being treated through time delay and frequency mixing, and each transmitting station can achieve synchronous transmission by frequency mixing of only one time. A delayer is formed by the method that a color TV set is cut and polished by glass delay lines. When used for frequency modulation synchronized broadcast, the present invention has the advantages of convenient maintenance, low manufacturing cost, easy compensation, extremely high stability and easy popularization.
Description
Technical field
The present invention relates to the broadcast communication technology, the multi-point delay compensation of a kind of signal with relative complex of more clearly saying so translates into the method for compensating multi-point delay that not only carries out delay compensation with the glass delay line delay easily but also the signal of superregulated property is arranged with the mode of twice mixing.
Background technology
The broadcast synchronization Phase Lock Technique in past is used to save frequency resource and enlarges covering, pays attention to the genlock of high frequency carrier, and the synchronous frequency-modulating broadcast required to development in recent years then far can not meet the demands.Generally be audio signal to be given different predelay both at home and abroad by each transmitting station, modulate again, launch, be also noted that the phase-locked and minimum frequency modulation error of pilot tone simultaneously, shortcomings such as the amount that caused the circuit complexity, easily drift about, need accurately adjust is too many, the operation and maintenance inconvenience has influenced applying of synchronous frequency-modulating broadcast technology.
Summary of the invention
Purpose of the present invention, be to overcome above-mentioned shortcoming, the multi-point delay compensation that proposes a kind of signal with relative complex translates into the mode of twice mixing to be carried out delay compensation but also the method for superregulated property is arranged with glass delay line not only easily, can in synchronous frequency-modulating broadcast, use, cost is low, working service is convenient, is easy to popularize.
For achieving the above object, the method for compensating multi-point delay of signal of the present invention is will carry out the mixing first time by stereo another fixed frequency that produces through the frequency-modulated wave and the same frequency a reference source crystal oscillator frequency synthesizer of frequency interleaved modulation modulator generation earlier, in first frequency mixer 1, obtain the frequency-modulated wave of a lower frequency, then it is postponed through glass delay line, in second frequency mixer 2, carry out the mixing second time with the said fixing frequency again, obtain to send out frequency-modulated wave, after launch after frequency-selecting and the power amplifier amplification.
Method of the present invention can be distributed, also can be centralized.
Distributed promptly before the mixing first time, at zone center frequency-modulated wave is mixed with another fixed frequency of same frequency a reference source earlier, then its output is transferred to each transmitting station through optical fiber or microwave channel.In each transmitting station, after the frequency-selector frequency-selecting, carry out the mixing first time, more earlier after launch after glass delay line delay, mixing for the second time, frequency-selecting and the power amplification.That is to say at zone center frequency-modulated wave is transferred to each transmitting station with another fixed frequency of same frequency a reference source, and each transmitting station carries out the mixing first time earlier with above-mentioned two frequencies, obtain the frequency-modulated wave of a lower frequency, behind glass delay line, carry out the mixing second time with the said fixing frequency again, what promptly obtain this transmitter should send out frequency-modulated wave, amplify output, the signal transmission delay amount of each transmitting station is suitable to be revised in advance with the glass delay line that has nothing in common with each other.All after the transmission conversion, obtain the frequency-modulated wave of 92M and the fixed frequency ripple of 96M such as each transmitting station, carry out the mixing first time and obtain the 4M frequency-modulated wave, after the different glass delay line postpones, carry out the mixing second time with the 96M fixed frequency again, select 100M and launch.
Centralized is, and each transmitting station needs postpones and mixing for the first time all concentrates in the zone center and carries out through each of glass delay line, and this can further simplify the equipment of each transmitting station.Elder generation with after the glass delay lines delays at different levels of the frequency-modulated wave process of lower frequency, carries out the mixing first time with the different fixing frequency in same frequency reference source respectively again in each first frequency mixer 1 in zone center, obtain several frequency-modulated waves.Mix in blender with the different fixing frequency in several same frequency reference sources again that back pairing enters optical fiber or microwave channel transfers to each transmitting station.In each transmitting station, select wherein a pair of frequency by frequency-selector earlier, i.e. a frequency-modulated wave, a fixed frequency, then this is directly carried out the mixing second time to frequency in second frequency mixer 2, this moment, each promptly obtained fully together the frequency-modulated wave of homophase frequently, after launch after frequency-selecting and the power amplifier amplification.64M frequency-modulated wave such as transmission 60M frequency-modulated wave and predelay, transmit 40M fixed frequency and 36M fixed frequency simultaneously, then pass to Jia Tai earlier, get 64M+36M, obtain 100M frequency-modulated wave emission, after pass to the second platform, then get 60M+40M, also obtain the emission of 100M frequency modulation, and the propagation delay time of two interstations is revised.Further, it is right multiple programs can be formed a plurality of frequencies at a convenience center respectively with as above method, and then form a plurality of frequency pools, enter transmission channel again, then can further simplify transmitter, make the frequency modulation modulation degree centralized control of each, avoid disadvantages such as modulation degree is excessive, out of control, every index guarantees easily, improves the broadcasting audibility greatly.
Twice mixing all used in above-mentioned two kinds of time delay corrections, and the place of its delay compensation is divided into distributing and centralized two kinds, all is time delay processing to be forwarded on the glass delay line that is easy to realize carry out.This glass delay line is to utilize the common color television set delay line transformation of the way to form, and it is easy, inexpensive, ripe to originate.Method for remanufacturing is cut, is polished by its reflection path, obtains various retardation, just obtains required retardation after the collocation cascade.Above-mentioned transmission is served as by optical fiber or microwave channel that city and highway all are easier to satisfy, and the frequency interleaved modulation modulator that relates to, frequency synthesizer, frequency mixer, frequency-selector and power amplifier etc. are prior art.
The method of adjustment of the amount of delay of said glass delay line is along the straight cuts parallel with its two big right-angle sides and with the cut surface polishing, and can be made up by the cascade of polylith glass delay line.
Task of the present invention comes to this and finishes.
The inventive method is simple, and compensation is easy and stability is high, and cost is low, and working service is convenient, is easy to popularize.Compare with the Phase Lock Technique in past, its cost has only 25～60%.It can be widely used in the synchronous frequency-modulating broadcast.
Description of drawings
Fig. 1 is the block diagram of embodiment 1 distributing delay compensation method.
Fig. 2 is the block diagram of embodiment 2 centralized delay compensation methods.
Fig. 3 is a color television set with embodiment 1 and 2 and the cutting schematic diagram of glass delay line.
Embodiment
Be further described below in conjunction with embodiment.
1 is center modulating unit and blender among Fig. 1, and stereo to become frequency-modulated wave F1 and same frequency reference source through frequency interleaved modulation modulator be that another fixed frequency F2 of frequency synthesizer output delivers to blender, and transmission channel is sent in its output again.2 is transmitting stations among the figure, wherein frequency-selector is selected frequency-modulated wave F1 and fixed frequency F2 enters first frequency mixer 1, the frequency-modulated wave of first frequency mixer, 1 output lower frequency enters frequency-selecting and delayer, its output is carried out the mixing second time at second frequency mixer 2 with fixed frequency F2, after frequency-selecting, be and launch frequency-modulated wave, amplify output.
With the phase-locked modulator of frequency synthesizer the left and right acoustic channels audio signal of input is modulated to the frequency-modulated wave of lower frequency among Fig. 2, the fixed frequency mixing that the one road is direct and frequency synthesizer comes, another road enters delayer, and the next stage delayer is sent in one tunnel output of delayer, another fixed frequency mixing that one tunnel output is then next with frequency synthesizer, many groups fixed frequency with frequency synthesizer output after its output frequency-selecting enters blender, it is right to form a plurality of frequencies, be transferred to each transmitter 7,7 a pair of frequencies that only need to be scheduled to of each transmitter are selected, promptly obtain tranmitting frequency after the mixing, amplify output.
10,11 is the transducer oscillator among Fig. 3, and its sheet glass along AB and CD line cutting and polishing, is promptly obtained 12 μ s amount of delay, then can obtain the amount of delay of 18 or 30 μ s respectively along the cutting of EF or AB line.And, then can do the time-delay adjustment of μ s level with the translation slightly of above-mentioned line of cut.
The embodiment of the invention 1 and 2 total costs are respectively 25% and 60% of the past, and method is simple, do not have and frequently float, and distortion is little, and synchronism is good, and stability is high.Can be widely used in the synchronous frequency-modulating broadcast, particularly convenient for city and highway area.
Claims (4)
1. the method for compensating multi-point delay of a signal, it is characterized in that it will carry out the mixing first time with another fixed frequency of same frequency a reference source crystal oscillator frequency synthesizer generation by the stereo frequency-modulated wave that produces through frequency interleaved modulation modulator earlier, in first frequency mixer (1), obtain the frequency-modulated wave of a lower frequency, then it is postponed through glass delay line, in second frequency mixer (2), carry out the mixing second time with the said fixing frequency again, obtain to send out frequency-modulated wave, after launch after frequency-selecting and the power amplifier amplification.
2. according to the method for compensating multi-point delay of the described signal of claim 1, it is characterized in that before the said mixing first time, at zone center frequency-modulated wave is mixed with another fixed frequency of same frequency a reference source earlier, then its output is transferred to each transmitting station through optical fiber or microwave channel, in each transmitting station, after the frequency-selector frequency-selecting, carry out the mixing first time, more earlier after launch after glass delay line delay, mixing for the second time, frequency-selecting and the power amplification.
3. according to the method for compensating multi-point delay of claims 1 described signal, it is characterized in that postponing and mixing for the first time all concentrates in the zone center and carries out of said each transmitting station needs through each of glass delay line, in first frequency mixer (1), carry out the mixing first time with the fixed frequency of the different frequency in same frequency reference source respectively again after promptly in zone center, the frequency-modulated wave of lower frequency being postponed through glass delay lines at different levels earlier, obtain each frequency-modulated wave, mix in blender with the fixed frequency of the different frequency in several same frequency reference sources again that the back pairing enters optical fiber or microwave channel transfers to each transmitting station, in each transmitting station, earlier select wherein a pair of frequency by frequency-selector, i.e. frequency-modulated wave, a fixed frequency, then this is directly carried out the mixing second time to frequency in second frequency mixer (2), after launch after frequency-selector and the power amplifier amplification.
4. according to the method for compensating multi-point delay of claim 1 or 2 described signals, the method of adjustment that it is characterized in that the amount of delay of said glass delay line is along the straight cuts parallel with its two big right-angle sides and with the cut surface polishing, and can be made up by the cascade of polylith glass delay line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00105048 CN1219367C (en) | 2000-05-15 | 2000-05-15 | Method for compensating multi-point delay of signal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00105048 CN1219367C (en) | 2000-05-15 | 2000-05-15 | Method for compensating multi-point delay of signal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1317886A CN1317886A (en) | 2001-10-17 |
| CN1219367C true CN1219367C (en) | 2005-09-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 00105048 Expired - Fee Related CN1219367C (en) | 2000-05-15 | 2000-05-15 | Method for compensating multi-point delay of signal |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106772470B (en) * | 2016-12-23 | 2019-06-18 | 湖南北云科技有限公司 | Satellite navigation multifrequency receiver multifrequency point time delay detection and bearing calibration, device |
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- 2000-05-15 CN CN 00105048 patent/CN1219367C/en not_active Expired - Fee Related
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| CN1317886A (en) | 2001-10-17 |
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Granted publication date: 20050914 Termination date: 20110515 |