CN101499864A - Short message wireless broadcasting method, system and receiving terminal - Google Patents
Short message wireless broadcasting method, system and receiving terminal Download PDFInfo
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- CN101499864A CN101499864A CNA2008100430860A CN200810043086A CN101499864A CN 101499864 A CN101499864 A CN 101499864A CN A2008100430860 A CNA2008100430860 A CN A2008100430860A CN 200810043086 A CN200810043086 A CN 200810043086A CN 101499864 A CN101499864 A CN 101499864A
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Abstract
The invention discloses a wireless short message broadcasting method, a system and a receiving terminal, and implements the transceiving of binary data based on the audio broadcasting principle and the DTMF encoding and decoding principle; as the short message broadcasting is based on the characteristics of DTMF audios, a receiving circuit of the receiving terminal can easily detect a short message broadcasting signal that belongs to the system, thus forming the multipoint-to-multipoint communication system that is based on different carrier frequencies. The wireless short message broadcasting method, the system and the receiving terminal have lower hardware implementation cost and system running cost.
Description
Technical field
The present invention relates to the broadcast communication technology, particularly a kind of short message wireless broadcasting method, system and receiving terminal.
Background technology
Fast development along with modern city, high efficiency utilization to various resources is had higher requirement, people wish to issue by the relevant information to various resources, make people can understand the relevant information of various resources timely and conveniently such as the positional information in parking lot, expenses standard and real-time parking stall use information etc., thereby improve the service efficiency of parking position, provide more convenient parking service for the car owner simultaneously.
By radio broadcasting is the effective way that releases news, but common wireless broadcast system occupied bandwidth is bigger, is unfavorable for the conserve on spectrum resource, and is mostly to carry out large power long apart from broadcasting.
Summary of the invention
The technical problem to be solved in the present invention is, carries out short message wireless broadcasting, only requires lower wireless telecommunications bandwidth and lower radio transmitted power.
For solving the problems of the technologies described above, the invention provides a kind of short message wireless broadcasting method, short message wireless broadcasting method, short message broadcast transmission end emission short message, the short message receiving terminal receives short message, may further comprise the steps:
The first step:, and convert character string at short message broadcast transmission end input short message text to be broadcast;
Second step: described character string is represented with binary code sequence each byte of binary code is divided into high 4 bit and low 4 bit;
The 3rd step: high 4 bit, the low level bit of a byte of binary code are converted to the pairing numeral of dtmf code standard respectively, short message text to be broadcast is represented by the pairing DTMF Serial No. of a dtmf code standard;
The 4th step: the audio signal that each digital translation in the DTMF Serial No. is become certain hour length, and with its one section dtmf tone frequency of order composition signal according to the DTMF Serial No., thereby short message text representation to be broadcast is one section dtmf tone signal frequently;
The 5th step: one section dtmf tone frequency signal that the 4th step was formed carries out broadcast transmission by broadcast transmission equipment;
The 6th step: the short message receiving terminal obtains one section dtmf tone frequency signal of the expression short message text of corresponding the 4th step formation by the receiving demodulation unit;
The 7th step: the section audio signal input DTMF decoding circuit with the 6th step obtained, its reduction is become corresponding DTMF Serial No., this DTMF Serial No. is become corresponding binary code sequence according to the dtmf code standard handovers;
The 8th step: the binary code sequence that the 7th step was formed is reduced into the corresponding characters sequence according to high low level fractionation rule and the consistent character code standard consistent with transmitting terminal;
The 9th step: the 8th character series that obtains of step is stored and show.
For solving the problems of the technologies described above, the present invention also provides a kind of short message wireless broadcasting system, comprise the short message broadcast transmission equipment of launching short message and the short message receiving equipment that receives short message, short message broadcast transmission equipment comprises: the short message input unit is used to edit input and prepares the short message of broadcasting and the short message text-converted is become character string; The binary coding unit is used for described character string is represented with binary code sequence, each byte of binary code be divided into high 4 bit and low 4 bit; The dtmf code unit is used for high 4 bit, the low level bit of a byte are converted to the pairing numeral of dtmf code standard respectively, and short message text to be broadcast is represented by the pairing DTMF Serial No. of a dtmf code standard; Dtmf tone is the signal generation unit frequently, is used for each digital translation of DTMF Serial No. is become the audio signal of certain hour length, and its order according to the DTMF Serial No. is formed one section dtmf tone signal frequently; The modulate emission unit is used for described dtmf tone frequency signal is carried out broadcast transmission; The short message receiving equipment comprises: the receiving demodulation unit is used for receiving broadcast signal demodulation output dtmf tone signal frequently; The DTMF reduction unit is used for the dtmf tone signal reduction frequently of demodulation output is become corresponding DTMF Serial No.; The DTMF decoding unit is used for described DTMF Serial No. is become corresponding binary code sequence according to the dtmf code standard handovers; The binary decoded unit is used for described binary code sequence is reduced into character string; The short message display unit is used for storage and shows short message.
The present invention also provides a kind of short message wireless broadcasting receiving terminal, comprise: the receiving demodulation unit, be used in its working frequency range, carrying out frequency scanning, when the signal strength signal intensity that detects a certain frequency surpasses certain threshold value, receive the broadcast singal and the demodulation output audio signal of this frequency; The DTMF reduction unit is used to judge whether this audio signal contains dtmf tone certain characteristic of signal frequently, if then the dtmf tone signal reduction frequently that receives is become corresponding DTMF Serial No.; The DTMF decoding unit is used for described DTMF Serial No. is become corresponding binary code sequence according to the dtmf code standard handovers; The binary decoded unit is used for described binary code sequence is reduced into character string; The short message display unit is used for storage and shows short message.
The present invention is based on audio broadcasting principle and DTMF encoding and decoding principle and carry out the binary data transmitting-receiving, because this system is based on dtmf tone characteristic frequently, the receiving terminal receiving demodulation circuit is easy to detect the short message broadcast singal that belongs to this system, has so just formed the multi-multipoint communication system based on different carrier frequencies.Short message broadcast transmission equipment can be in order to adapt to the needs of short distance broadcast communication, to have less transmitting power, and hardware implementation cost and system operation cost are lower.Among the present invention, the content of broadcasting is orientated short message as, the data volume of information broadcast is smaller each time, only require less communication bandwidth, be fit to the requirement of dtmf code, dtmf code has stronger antijamming capability simultaneously, can be issued to effective communication distance far away relatively in lower transmitting power.
Description of drawings
Below in conjunction with the drawings and the specific embodiments the present invention is described in further detail.
Fig. 1 is short message wireless broadcasting method one an execution mode schematic diagram of the present invention;
Fig. 2 is short message wireless broadcasting of the present invention system one an execution mode schematic diagram.
Embodiment
Short message wireless broadcasting method one execution mode of the present invention as shown in Figure 1, short message broadcast transmission end emission short message, the short message receiving terminal receives short message, this method may further comprise the steps:
The first step: utilize computer or other equipment input short message text to be broadcast, and be processed into character string.
Second step: the formed character string of the first step is represented with binary code sequence.The binary code here can be any one standard code, but will carry out the Unified coding standard in same system.Short message text to be broadcast so just is made up of the binary system byte data of a sequence, and Chinese character is by two byte representations usually, and English alphabet and numeral are by a byte representation.
The 3rd step: each byte of binary code is divided into high 4 bit and low 4 bit, promptly can be high four preceding, also can hang down four preceding, this sequence requirement unanimity in same system, 4 bit with correspondence are converted to the pairing numeral of dtmf code standard then.Short message text to be broadcast is so just represented by the pairing DTMF Serial No. of a dtmf code standard.
The 4th step: each digital translation in the DTMF Serial No. is become the audio signal of certain hour length, and its order according to the DTMF Serial No. is formed a section audio signal.Its time length is represented the summation of the audio signal of single DTMF numeral for all, in order to improve the reliability of receiving terminal, can insert the spacing wave of certain hour length at single dtmf tone frequently between the signal, promptly form the mute interval of certain hour length frequently between the signal at single dtmf tone.The DTMF Serial No. is just represented by the section audio signal that one section dtmf tone frequency signal and mute interval are formed like this.Be that short message text to be broadcast is just represented by a section audio signal.
The 5th step: the section audio signal that the 4th step was formed carries out broadcast transmission by FM broadcasting (or in, other broadcast modes such as the minor width of cloth, digital audio broadcasting) transmitter, the broadcasting here is meant broadcasting station common in our daily life, also can be the dedicated broadcast radio station of special requisition channel.Transmitter in the course of the work, at first in certain band limits, carry out frequency scanning automatically, detect the occupied frequency of scanning region, select one in current region, be not used or frequency (detected signal strength signal intensity is lower than a threshold value) that this frequency wireless signal is relatively very faint as the carrier frequency of self using, then to sent short message carry out one section dtmf tone that dtmf code obtains frequently signal launch by frequency modulated carrier equipment.
The 6th step:, obtain one section dtmf tone frequency signal of the expression short message text of corresponding the 4th step formation by receiving demodulation unit receiving broadcast signal and demodulation at receiving terminal.In the course of work of receiving terminal circuit, at first automatically, carry out frequency scanning, when when a certain frequency detects the FM signal with certain signal strength signal intensity, think that this frequency has broadcast signal source in current region, detect the audio signal that receives then, judge whether to contain dtmf tone certain characteristic (as the dtmf code frequency and the length of regularity) of signal frequently, if, think that then the signal source of this frequency belongs to the echo signal source of short message wireless broadcasting system, then the dtmf tone frequency signal that receives is reduced, decoding, otherwise think that this frequency signal source is other broadcast singals.
The 7th step: the one section dtmf tone signal input frequently DTMF decoding circuit with the 6th step obtained, its reduction is become corresponding DTMF Serial No., this DTMF Serial No. is become corresponding binary code sequence according to the dtmf code standard handovers.
The 8th step: the binary code sequence that the 7th step was formed is reduced into the corresponding characters sequence according to high low level fractionation rule and the consistent character code standard consistent with transmitting terminal.
The 9th step: the character series of utilizing computer or other equipment that the 7th step was obtained is stored and is shown.
Short message wireless broadcasting of the present invention system one execution mode as shown in Figure 2, comprise the short message broadcast transmission equipment of launching short message and the short message receiving equipment that receives short message, short message broadcast transmission equipment at short message broadcast transmission end comprises: short message input units such as computer are used to edit input and prepare the short message of broadcasting and the short message text-converted is become character string; The binary coding unit is used for described character string is represented with binary code sequence, each byte of binary code be divided into high 4 bit and low 4 bit; The dtmf code unit is used for high 4 bit, the low level bit of a byte are converted to the pairing numeral of dtmf code standard respectively, and short message text to be broadcast is represented by the pairing DTMF Serial No. of a dtmf code standard; Dtmf tone is the signal generation unit frequently, is used for each digital translation of DTMF Serial No. is become the audio signal of certain hour length, and its order according to the DTMF Serial No. is formed one section dtmf tone signal frequently; The modulate emission unit (frequency modulation or in, the minor width of cloth, the digital audio emission), be used for described audio signal is carried out broadcast transmission, the modulate emission unit comprises the broadcast singal detecting unit, the broadcast transmission unit, the broadcast singal detecting unit carries out frequency scanning in the working frequency range of short message broadcast transmission equipment, detect the intensity of the wireless signal of each frequency in its working frequency range, determine that a wireless signal strength is lower than the FM broadcasting carrier frequency of the frequency of a threshold value as the broadcast transmission unit, according to different application requirements, can carry out the dual track emission, the two-way audio signal both can all be the audio signal that comprises the character string information of dtmf code, also can be the audio signal that comprises the character string information of one tunnel ordinary audio signal and one road dtmf code; Short message receiving equipment at the short message receiving terminal comprises: the receiving demodulation unit, be used to receive described audio signal, can in its working frequency range, carry out frequency scanning, when the signal strength signal intensity that detects a certain frequency surpasses certain threshold value, receive described audio signal, when the audio signal that receives is binaural signal, also comprise the channel separation circuit in the receiving demodulation unit, the audio signal that receives is separated into left and right acoustic channels two-way audio signal; The DTMF reduction unit can judge whether audio signal contains dtmf tone certain characteristic (as the dtmf code frequency and the length of regularity) of signal frequently, if then the dtmf tone signal reduction frequently that receives is become corresponding DTMF Serial No.; The DTMF decoding unit is used for described DTMF Serial No. is become corresponding binary code sequence according to the dtmf code standard handovers; The binary decoded unit is used for described binary code sequence is reduced into character string; The short message display unit is used for storage and shows short message; The speech play unit is used for the audio signal of receiving demodulation unit demodulation output is carried out speech play.
The present invention is mainly used in the application scenario of short-distance wireless broadcasting short message, special-purpose short message receiving terminal is equipped with is used for short message to different terminal uses and receives, carry out the user of short message wireless broadcasting for different needs short message broadcast transmission equipment configuration.
In an embodiment of the present invention, related short message broadcast transmission equipment has following feature:
Can automatically the short message character string be converted to the dtmf tone frequency signal of one section dtmf code, this audio signal can be as audio input signal in the monophonic broadcasting transmitter, also can be in the stereophonic broadcasting transmitter as the audio input signal of L channel or R channel arbitrarily wherein, with the audio input signal of another one sound channel broadcast transmission simultaneously; Be operated in certain band limits, a certain frequency steady operation that can be in this band limits; Have than the more highly sensitive carrier wave measuring ability of common broadcast receiving terminal, can in certain band limits, carry out scanning search automatically, whether search has other broadcast transmission equipment in certain working frequency points work in the work at present zone, automatically choose the working frequency points of self then, this working frequency points in current region, be not used or this frequency wireless signal relatively very faint; Has less relatively transmitting power, can adjust the effective communication distance of its short message wireless broadcasting by adjusting its actual emission power, such as according to its application scenario, this effective communication distance can be certain indoor range, certain building or certain square scope, or certain residential quarter or certain street scope or the like.
Related special-purpose short message receiving terminal has following feature:
Be operated in certain band limits, can be at the frequency steady operation of a certain setting, can in certain band limits, carry out frequency scanning, the frequency that can normally receive in this band limits is preserved, and on this sequence frequency, stablize receiving broadcast signal, can only be operated in a certain fixing frequency at synchronization, mode by poll, the information content that the short message wireless broadcasting equipment of working in certain band limits is sent is stored and is shown, the poll of broadcast singal, dtmf tone is input frequently, dtmf tone signal reduction frequently, functions such as decoding and the storage of short message character string are all finished automatically, and the user can check the short message that receives one by one by button operation; Can discern the dtmf code characteristic in the broadcast voice signal that receives automatically, and whether distinguish this broadcast signal source with this be short message wireless broadcasting signal source in the native system; Can be equipped with the left and right acoustic channels separative element and receive stereo broadcasting signal, in the stereo broadcasting signal that receives, when a sound channel is the ordinary audio signal, it is carried out playback as the ordinary audio signal, when another sound channel is the dtmf code signal, it is reduced to the short message character string shows.
In order to guarantee that special-purpose short message receiving terminal can receive the information content that all short message wireless broadcasting equipment of being operated in this band limits send, short message wireless broadcasting equipment repeats to send to the short message of identical content and it repeats to send cycle to be not less than total cycle in all useful signal sources of special-purpose short message receiving terminal poll.
Provide a specific embodiment below.
At a certain managing system of car parking operator, in daily operation process, the relevant parking space information in parking lot need be sent to the car owner, for the car owner provides information such as parking lot positional information and parking stall operating position accurately.Based on the invention process one cover parking lot information wireless broadcast system.
Be respectively the affiliated parking lot of this operator and be equipped with preparation frequency modulation short message broadcast transmission equipment, for each car owner user is equipped with special-purpose short message receiving terminal.
At first, short message broadcast transmission equipment carries out frequency scanning in a band frequency scope of determining, automatically adjusting operating frequency is an idle frequency that does not have effective FM signal in the current region, the idle frequency of the frequency 87.00MHz that can receive such as common FM receiver in the 107.00MHz frequency range, the actual requirement of using then according to the parking lot information broadcast, transmitting power to short message broadcast transmission equipment is adjusted, make its effective coverage range less (as radius less than 3000 meters, be about 2000 meters of radiuses), the coverage of many FM broadcasting transmitting end equipments can cover mutually.
The short message text that the input of short message broadcast transmission equipment is to be sent is such as comprising the parking lot title, information such as position, parking lot, parking fee collective system standard and empty vehicle parking position of parking lot number.Short message broadcast transmission equipment is that a section audio signal of dtmf code carries out the frequency modulation emission automatically with this short message text-converted.
When the car owner user who has been equipped with special-purpose short message receiving terminal enters the scope of said short message breath broadcast transmission equipment covering, this terminal equipment carries out frequency scanning to 87.00MHz in the 107.00MHz band limits, the frequency that can normally receive in this band limits is preserved, and on this sequence frequency the stable fm broadcast signal that receives, automatically discern the dtmf code characteristic in the FM broadcasting audio signal that receives, whether distinguish this fm broadcast signal source with this is short message wireless broadcasting signal source in the native system, can only be operated in a certain fixing frequency at synchronization, mode by poll, the information content that the short message wireless broadcasting equipment of working in this band limits is sent is stored and is shown that the user can check the short message that receives one by one by button operation; As be equipped with the left and right acoustic channels separative element, in the stereophonic FM broadcasting signal that then ought receive, when a sound channel is the ordinary audio signal, it is carried out playback as the ordinary audio signal, when another sound channel is dtmf tone frequency signal, it is reduced to the short message character string shows.
DTMF (Dual Tone Multi-Frequency, dual-tone multifrequency) codec converts keystroke or digital information to two-tone signal and transmission when coding, in the dtmf signal of receiving, detect the existence of keystroke or digital information during decoding, dtmf signal is made of the audio signal stack of two frequencies, the frequency of these two audio signals is from two groups of preallocated group of frequencies: line frequency group or row are group frequently, each is to numeral of the unique expression of such audio signal or symbol, 16 buttons are for example arranged in the telephone set usually, 10 numerical keys 0～9 and 6 function key * are wherein arranged, #, A, B, C, D.Because according to combinatorial principle, 8 kinds of different single audio signals generally should be arranged, and therefore adoptable frequency also has 8 kinds, so be referred to as multifrequency, make up for 2 kinds because of its employing any extraction from 8 kinds of frequencies again and encode, so be referred to as the coding techniques of " getting 2 in 8 " again.Suggestion according to CCITT, the multiple frequency of Cai Yonging is 687Hz in the world, 770Hz, 852Hz, 941Hz, 1209Hz, 1336Hz, 8 kinds of 1477Hz and 1633Hz etc., can form 16 kinds of different combinations with these 8 kinds of frequencies, thereby represent 16 kinds of different numerals or function key, concrete combination sees Table 1, like this, corresponding 16 groups of different combinations are 16 kinds of different audio signals, these 16 kinds of different audio signals can identify by 4 binary number, otherwise, each binary number of 8 is split as high 4 and low 4 earlier, represent by two different audio signals then, in actual applications, each binary number of 8 is split as high 4 and low 4 earlier, the dtmf tone of the corresponding one section certain hour length of each 4 bit is signal frequently, and the time span here can be identified as standard with hardware circuit in using, and generally can be set to 10 milliseconds to 200 milliseconds.
Table 1: the combination function of dual-tone multifrequency
| High frequency group Hz low frequency group Hz | 1209 | 1336 | 1477 | 1633 |
| 697 | 1 | 2 | 3 | A |
| 770 | 4 | 5 | 6 | B |
| 852 | 7 | 8 | 9 | C |
| 941 | * | 0 | # | D |
The present invention is based on audio broadcasting principle and DTMF encoding and decoding principle and carry out the binary data transmitting-receiving, set up a kind of physical link of radio broadcasting short message, in the application system of reality, based on this physical link layer, can self-defining data link layer and other upper strata communications protocol.The present invention comprises a cover short message broadcast transmission end and the special-purpose short message receiving terminal of a cover at least, one simple communication system partners, also can be by using different carrier frequencies or based on the address extension of upper strata communications protocol, the complex communication system of partner many or multi-to-multi.When a plurality of transmitting terminals being arranged in the system and use different carrier frequencies, transmitting terminal carries out carrier wave earlier and detects before carrying out broadcast transmission, promptly in certain band limits, carry out frequency scanning, when detecting idle frequency, with this frequency point setting is the working frequency points of self, at this moment receiving terminal also has the frequency point scanning function, because this system is based on dtmf tone characteristic frequently, the receiving terminal receiving demodulation circuit is easy to detect the transmitting terminal signal that belongs to this system, has so just formed the multi-multipoint communication system based on different carrier frequencies.Address extension mode based on upper-layer protocol has a lot of existing communications protocol, such as IP address-based addressing protocol etc., also can be other self-defining agreements.Among the present invention, the short message signal transmitting terminal can be in order to adapt to the needs of short distance broadcast communication, to have less transmitting power, meet national relevant policies rules, and hardware implementation cost and system operation cost are lower.Among the present invention, the content of broadcasting is orientated short message as, the data volume of information broadcast is smaller each time, only require less communication bandwidth, be fit to the requirement of dtmf code, dtmf code has stronger antijamming capability simultaneously, so application the present invention, be particularly suitable for the little application scenario of communication data amount, simultaneously because its stronger anti-interference characteristics can be issued to effective communication distance far away relatively in lower transmitting power.
Claims (10)
1, a kind of short message wireless broadcasting method, short message broadcast transmission end emission short message, the short message receiving terminal receives short message, may further comprise the steps:
The first step:, and convert character string at short message broadcast transmission end input short message text to be broadcast;
Second step: described character string is represented with binary code sequence each byte of binary code is divided into high 4 bit and low 4 bit;
The 3rd step: high 4 bit, the low level bit of a byte of binary code are converted to the pairing numeral of dtmf code standard respectively, short message text to be broadcast is represented by the pairing DTMF Serial No. of a dtmf code standard;
The 4th step: the audio signal that each digital translation in the DTMF Serial No. is become certain hour length, and with its one section dtmf tone frequency of order composition signal according to the DTMF Serial No., thereby short message text representation to be broadcast is one section dtmf tone signal frequently;
The 5th step: one section dtmf tone frequency signal that the 4th step was formed carries out broadcast transmission by broadcast transmission equipment;
The 6th step: the short message receiving terminal obtains one section dtmf tone frequency signal of the expression short message text of corresponding the 4th step formation by the receiving demodulation unit;
The 7th step: the section audio signal input DTMF decoding circuit with the 6th step obtained, its reduction is become corresponding DTMF Serial No., this DTMF Serial No. is become corresponding binary code sequence according to the dtmf code standard handovers;
The 8th step: the binary code sequence that the 7th step was formed is reduced into the corresponding characters sequence according to high low level fractionation rule and the consistent character code standard consistent with transmitting terminal;
The 9th step: the 8th character series that obtains of step is stored and show.
2, short message wireless broadcasting method according to claim 1, it is characterized in that, in the 5th step, short message broadcast transmission end at first carries out frequency scanning in its working frequency range, detect the intensity of the wireless signal of each frequency in its working frequency range, determine that a wireless signal strength is lower than the frequency of a threshold value as the broadcast carrier frequency; The 6th step short message receiving terminal receiving demodulation unit carries out frequency scanning in itself and the corresponding working frequency range of short message broadcast transmission end, when the signal strength signal intensity that detects a certain frequency surpasses certain threshold value, the demodulation output audio signal, and judge whether this audio signal contains dtmf tone certain characteristic of signal frequently, if then this audio signal is carried out DTMF reduction, decoding.
3, a kind of short message wireless broadcasting system, comprise the short message broadcast transmission equipment of launching short message and the short message receiving equipment that receives short message, it is characterized in that, short message broadcast transmission equipment comprises: the short message input unit is used to edit input and prepares the short message of broadcasting and the short message text-converted is become character string; The binary coding unit is used for described character string is represented with binary code sequence, each byte of binary code be divided into high 4 bit and low 4 bit; The dtmf code unit is used for high 4 bit, the low level bit of a byte are converted to the pairing numeral of dtmf code standard respectively, and short message text to be broadcast is represented by the pairing DTMF Serial No. of a dtmf code standard; Dtmf tone is the signal generation unit frequently, is used for each digital translation of DTMF Serial No. is become the audio signal of certain hour length, and its order according to the DTMF Serial No. is formed one section dtmf tone signal frequently; The modulate emission unit is used for described dtmf tone frequency signal is carried out broadcast transmission; The short message receiving equipment comprises: the receiving demodulation unit is used for receiving broadcast signal demodulation output dtmf tone signal frequently; The DTMF reduction unit is used for the dtmf tone signal reduction frequently of demodulation output is become corresponding DTMF Serial No.; The DTMF decoding unit is used for described DTMF Serial No. is become corresponding binary code sequence according to the dtmf code standard handovers; The binary decoded unit is used for described binary code sequence is reduced into character string; The short message display unit is used for storage and shows short message.
4, short message wireless broadcasting according to claim 3 system, it is characterized in that, the modulate emission unit comprises broadcast singal detecting unit, broadcast transmission unit, the broadcast singal detecting unit carries out frequency scanning in the working frequency range of short message broadcast transmission equipment, detect the intensity of the wireless signal of each frequency in its working frequency range, determine that a wireless signal strength is lower than the broadcast carrier frequency of the frequency of a threshold value as the broadcast transmission unit; The receiving demodulation unit can carry out frequency scanning in its working frequency range, when the signal strength signal intensity that detects a certain frequency surpasses certain threshold value, receive the broadcast singal and the demodulation output audio signal of this frequency; Whether this audio signal of judging the DTMF reduction unit contains dtmf tone certain characteristic of signal frequently, if then the audio signal reduction that receives is become corresponding DTMF Serial No..
5, short message wireless broadcasting according to claim 3 system is characterized in that, comprises a plurality of short message broadcast transmission equipment and a plurality of short message receiving equipment.
6, short message wireless broadcasting according to claim 3 system is characterized in that, the effective coverage range radius of the wireless signal of frequency modulation transmitter unit emission is less than 3000 meters.
7, short message wireless broadcasting according to claim 3 system is characterized in that, described short message input unit is used to edit the short message in input parking lot and the short message text-converted is become character string.
8, a kind of short message wireless broadcasting receiving terminal, it is characterized in that, comprising: the receiving demodulation unit is used for carrying out frequency scanning in its working frequency range, when the signal strength signal intensity that detects a certain frequency surpasses certain threshold value, receive the broadcast singal and the demodulation output audio signal of this frequency; The DTMF reduction unit is used to judge whether this audio signal contains dtmf tone certain characteristic of signal frequently, if then the dtmf tone signal reduction frequently that receives is become corresponding DTMF Serial No.; The DTMF decoding unit is used for described DTMF Serial No. is become corresponding binary code sequence according to the dtmf code standard handovers; The binary decoded unit is used for described binary code sequence is reduced into character string; The short message display unit is used for storage and shows short message.
9, short message wireless broadcasting receiving terminal according to claim 8 is characterized in that, also comprises the audio signal output unit, is used for the audio signal of receiving demodulation unit demodulation output is carried out speech play.
10, short message wireless broadcasting receiving terminal according to claim 8 is characterized in that, also comprises the channel separation circuit in the receiving demodulation unit, and the audio signal that receives is separated into left and right acoustic channels two-way audio signal.
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| CN102905196A (en) * | 2012-09-28 | 2013-01-30 | 杭州锐昂科技有限公司 | Method and system for sending information from television to mobile terminal |
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| CN102905196A (en) * | 2012-09-28 | 2013-01-30 | 杭州锐昂科技有限公司 | Method and system for sending information from television to mobile terminal |
| CN102905196B (en) * | 2012-09-28 | 2015-06-17 | 杭州锐昂科技有限公司 | Method and system for sending information from television to mobile terminal |
| CN105338501A (en) * | 2014-08-08 | 2016-02-17 | 中兴通讯股份有限公司 | Information transmission method and device as well as information obtaining method and device during call and terminal |
| CN105281805A (en) * | 2015-10-20 | 2016-01-27 | 广东公信智能会议股份有限公司 | Method and device for performing selective frequency hopping in frequency-hopping spread spectrum in real-time wireless audio transmission system |
| CN105281805B (en) * | 2015-10-20 | 2018-03-06 | 广东公信智能会议股份有限公司 | Method and device is jumped in the choosing of FHSS in real-time wireless audio transmission system |
| CN108288973A (en) * | 2017-01-10 | 2018-07-17 | 朴相来 | Wearable wireless telecom equipment and use its communication group setting method |
| CN108833045A (en) * | 2018-06-25 | 2018-11-16 | 江门市蓬江区中道电子有限公司 | Wireless multiterminal control audio droadcasting system and its data processing method |
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