CN103051391A - Method for reducing frequency modulation emergency broadcast RDS (Radio Data System) receiving error rate - Google Patents
Method for reducing frequency modulation emergency broadcast RDS (Radio Data System) receiving error rate Download PDFInfo
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- CN103051391A CN103051391A CN2012104743536A CN201210474353A CN103051391A CN 103051391 A CN103051391 A CN 103051391A CN 2012104743536 A CN2012104743536 A CN 2012104743536A CN 201210474353 A CN201210474353 A CN 201210474353A CN 103051391 A CN103051391 A CN 103051391A
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Abstract
The invention provides a method for reducing frequency modulation emergency broadcast RDS (Radio Data System) receiving error rate. The method is characterized in that RDS frequency deviation and audio frequency deviation of an FM (Frequency Modulation) exciter output signal are dynamically adjusted by using relation between RDS sensitivity and RDS frequency deviation according to a condition whether an emergency broadcast message is transmitted or not; no overflow of total frequency deviation of the signal is guaranteed; and the aims of reducing the RDS receiving error rate, expanding the emergency broadcast coverage range and not reducing the audio receiving quality are fulfilled.
Description
Technical field
The present invention relates to FM broadcasting transmission reception technique, relate in particular to a kind of frequency modulation emergency broadcast system that is applicable to utilize FM broadcasting data system (RDS) to transmit emergency broadcast message and reduce the method that RDS receives the error rate.
Background technology
In the frequency modulation emergency broadcast system, use RDS transmission emergency broadcast message, realize the functions such as receiver wakes up, emergent broadcasting information issue.RDS receives the height of the error rate, is related to coverage and the efficiency for issuing of emergency broadcast message.
RDS uses the frequency modulated subcarrier passage of 57K, adopts suppressed subcarrier frequency modulation (or claiming 2 phase phase shift keyings) mode transfer of data information, and the speed of its transmission information is about 1.2kbit/s.In having at present the FM exciter of RDS function, in order to guarantee the reception of main channel audio program, during exciter work, fixed the RDS maximum frequency deviation, generally be limited in 2.0kHz, maximum is no more than 7.5kHz.
Find that in actual use when the FM signal intensity that receiver receives was weak, frequency modulation main channel audio program can normally receive, but RDS receives error rate height, if improve the RDS frequency deviation in the signal this moment, RDS receives the error rate can be reduced.But the RDS maximum frequency deviation of present FM exciter is fixed and numerical value is less, if urgent broadcast occurs, and the place that field intensity is weak, it is higher that RDS receives the error rate, receiving terminal can not be fast and is correctly responded urgent broadcast, and the coverage of emergency broadcast message reduces, and does not reach the effect of urgent broadcast.
Summary of the invention
In order to overcome the technical problem that exists in the prior art, the invention provides following technical scheme: utilize the relation between RDS frequency deviation and the receiver receiving sensitivity, when urgent broadcast occurs, the FM exciter improves RDS frequency deviation to a suitable numerical value, reduce simultaneously main channel audio frequency frequency deviation, the total frequency deviation of assurance signal is not overflowed, and guarantees main channel audio program quality; During without urgent broadcast, the FM exciter reduces the RDS frequency deviation, increases the channel audio frequency deviation, guarantees that equally the total frequency deviation of signal do not overflow.
The beneficial effect that the present invention brings is: improve the RDS frequency deviation, guaranteed that receiver than the low field intensity zone, still has the lower RDS data receiver error rate.Owing to reduced the audio program frequency deviation, can not cause overflowing of the total frequency deviation of signal simultaneously, can not cause the audio reception quality to reduce, the reduction that only brings the audio reception volume, but the loss of this part volume can compensate by improving the receiver audio output volume.
Can be further understood by following detailed description and accompanying drawings about advantage of the present invention and method.
Description of drawings
Fig. 1 is that the composite stereo acoustical signal forms schematic diagram;
Fig. 2 is that engineering experiment draws RDS frequency deviation and receiving sensitivity Relations Among.
Embodiment
The below is to elaborating preferred embodiment of the present invention by reference to the accompanying drawings, thereby so that advantages and features of the invention can be easier to be it will be appreciated by those skilled in the art that protection scope of the present invention made more explicit defining.
The mathematical formulae of composite stereo acoustical signal is as follows:
MPX＝
a×0.5×(L+R)+
a×0.5×(L-R)×cos(2π×38K×t)
（1）
+0.1×cos(2π×19K×t)+
b×RDS
Total frequency deviation of FM signal is determined by the MPX signal amplitude, if the amplitude of MPX signal is no more than the allowed band of FM exciter, frequency deviation then can occur and overflow, and can not affect the audio broadcasting quality.By formula 1 as can be known, the proportionate relationship of adjusting L, R and RDS signal can realize improving the RDS frequency deviation, guarantees that simultaneously total frequency deviation do not overflow.This method principle as shown in Figure 1, pass through first an amplitude adjustment means after left and right acoustic channels and the input of RDS signal, according to the current urgent broadcast that whether occurs, adjust left and right acoustic channels and RDS signal amplitude, signal after the adjustment is encoded and is produced composite stereo acoustical signal (MPX), thereby reaches the purpose of adjusting RDS frequency deviation and audio frequency frequency deviation.
Have following relation between RDS frequency deviation and the receiver receiving sensitivity: under identical signal to noise ratio and signal strength signal intensity, the RDS frequency deviation is larger, and it is lower to receive the error rate.By a large amount of experiments obtain between RDS frequency deviation and the receiving sensitivity relation as shown in Figure 2.In order to guarantee the normal reception of RDS, require RDS to receive the error rate below 20%.From Fig. 2, can find when RDS frequency deviation during at 20kHz, when signal strength signal intensity be low to moderate-during 3dBuV, can guarantee that still RDS receives the error rate below 20%.Therefore in order to enlarge as much as possible the coverage of urgent broadcast, when the issue emergent broadcasting information, the RDS frequency deviation should be increased to 20KHz, reduces simultaneously the audio frequency frequency deviation.Owing to still leave larger frequency deviation surplus to audio signal, so the audio program quality of reception will can not be affected.
The above; it only is one of the specific embodiment of the present invention; but protection scope of the present invention is not limited to this; any those of ordinary skill in the art are in the disclosed technical scope of the present invention; variation or the replacement that can expect without creative work all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range that claims were limited.
Claims (3)
1. one kind is reduced the method that frequency modulation urgent broadcast RDS receives the error rate, it is characterized in that described method comprises:
Whether FM exciter basis sends emergency broadcast message is dynamically adjusted the RDS frequency deviation, and the total frequency deviation of assurance FM signal is not overflowed, and can not affect greatly the audio program quality of reception when reducing the RDS reception error rate.
2. a kind of method that frequency modulation urgent broadcast RDS receives the error rate that reduces according to claim 1 is characterized in that when sending emergency broadcast message, the FM exciter improves RDS frequency deviation in the signal, reduces the audio frequency frequency deviation; During without urgent broadcast, improve the audio frequency frequency deviation, reduce the RDS frequency deviation.
3. a kind of method that frequency modulation urgent broadcast RDS receives the error rate that reduces according to claim 1 is characterized in that, when sending emergency broadcast message, improves the RDS frequency deviation to 20kHz, has guaranteed that RDS still can normally receive under low received field strength.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012104743536A CN103051391A (en) | 2012-11-21 | 2012-11-21 | Method for reducing frequency modulation emergency broadcast RDS (Radio Data System) receiving error rate |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012104743536A CN103051391A (en) | 2012-11-21 | 2012-11-21 | Method for reducing frequency modulation emergency broadcast RDS (Radio Data System) receiving error rate |
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| CN103051391A true CN103051391A (en) | 2013-04-17 |
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| CN2012104743536A Pending CN103051391A (en) | 2012-11-21 | 2012-11-21 | Method for reducing frequency modulation emergency broadcast RDS (Radio Data System) receiving error rate |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109802739A (en) * | 2019-01-29 | 2019-05-24 | 成都德芯数字科技股份有限公司 | Broadcast modulation method and device |
| CN109862347A (en) * | 2019-01-25 | 2019-06-07 | 国家新闻出版广电总局广播电视规划院 | A kind of TV Safe Broadcasting Evaluation in Support Ability method |
| CN113839729A (en) * | 2020-06-08 | 2021-12-24 | 海鹰航空通用装备有限责任公司 | Device and method for predicting and evaluating coverage of frequency modulation broadcast signal |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1241073A (en) * | 1998-07-03 | 2000-01-12 | 熊庆旭 | Data communication system with automatic frequency sweep in FM broadcast subchannel and continuous phase frequency-shift keying |
| WO2012099932A1 (en) * | 2011-01-20 | 2012-07-26 | Panasonic Automotive Systems Company Of America, Division Of Panasonic Corporation Of North America | Method and apparatus for sensing inter-modulation to improve radio performance in single and dual tuner |
-
2012
- 2012-11-21 CN CN2012104743536A patent/CN103051391A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1241073A (en) * | 1998-07-03 | 2000-01-12 | 熊庆旭 | Data communication system with automatic frequency sweep in FM broadcast subchannel and continuous phase frequency-shift keying |
| WO2012099932A1 (en) * | 2011-01-20 | 2012-07-26 | Panasonic Automotive Systems Company Of America, Division Of Panasonic Corporation Of North America | Method and apparatus for sensing inter-modulation to improve radio performance in single and dual tuner |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109862347A (en) * | 2019-01-25 | 2019-06-07 | 国家新闻出版广电总局广播电视规划院 | A kind of TV Safe Broadcasting Evaluation in Support Ability method |
| CN109802739A (en) * | 2019-01-29 | 2019-05-24 | 成都德芯数字科技股份有限公司 | Broadcast modulation method and device |
| CN113839729A (en) * | 2020-06-08 | 2021-12-24 | 海鹰航空通用装备有限责任公司 | Device and method for predicting and evaluating coverage of frequency modulation broadcast signal |
| CN113839729B (en) * | 2020-06-08 | 2024-05-03 | 海鹰航空通用装备有限责任公司 | Frequency modulation broadcast signal coverage prediction evaluation device and method |
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Application publication date: 20130417 |