CN102594474B - Realize the system and method for amplitude modulation medium-wave urgent broadcast - Google Patents
Realize the system and method for amplitude modulation medium-wave urgent broadcast Download PDFInfo
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- CN102594474B CN102594474B CN201110003367.5A CN201110003367A CN102594474B CN 102594474 B CN102594474 B CN 102594474B CN 201110003367 A CN201110003367 A CN 201110003367A CN 102594474 B CN102594474 B CN 102594474B
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Abstract
The invention discloses a kind of system and method for realizing amplitude modulation medium-wave urgent broadcast, wherein system comprises: dispensing device and receiving system, described dispensing device is used in the gap phase of broadcast program audio signal or the gap of statement, dynamically insert dual-tone multifrequency urgent broadcast signaling by demand, and output after mixing with described broadcast program audio signal; Described receiving system is for receiving the broadcast program audio signal that includes dual-tone multifrequency urgent broadcast signaling of described dispensing device output, and broadcast program audio signal is wherein carried out exporting after power amplification, urgent broadcast signal is wherein decoded simultaneously, trigger radio and receive described urgent broadcast signal; The present invention utilizes antijamming capability that touch-tone signal is very strong and higher transmission speed, strictly inserts in the middle of broadcast program gap, has overcome the user's problem of receiving emergent broadcast information in time existing in prior art.
Description
Technical field
The present invention relates to communication technical field, relate in particular to a kind of system and side that realizes amplitude modulation medium-wave urgent broadcastMethod.
Background technology
In some situation, need receiving terminal can immediately receive the emergent broadcasting information that network sends and presentGive user, for example: warning information, comprises earthquake information, fire information, flood information, Typhoon Information etc.
These information and user's interests itself are closely related, and user more early receives better. But conventionallyIn situation, not receiving emergent broadcast information always of user. They may listen to other broadcast program orWhen person is unwitting, the receiving emergency broadcast message of not starting shooting in time.
Therefore,, if the receiving terminal before using, under many circumstances, user cannot receive tightly in timeAnxious broadcast message, this will cause user cannot obtain in time emergence message, cannot make a response rapidly.
Summary of the invention
In view of above-mentioned analysis, the present invention aims to provide a kind of system and side that realizes amplitude modulation medium-wave urgent broadcastMethod, in order to solve the user's problem of receiving emergent broadcast information in time existing in prior art.
Object of the present invention is mainly achieved through the following technical solutions:
The invention provides a kind of system that realizes amplitude modulation medium-wave urgent broadcast, comprising: dispensing device and receptionDevice, wherein,
Described dispensing device, for the gap phase in broadcast program audio signal or the gap of statement, pressesDemand is dynamically inserted dual-tone multifrequency urgent broadcast signaling, and output after mixing with described broadcast program audio signal;
Described receiving system, believes for the dual-tone multifrequency urgent broadcast that includes that receives described dispensing device outputThe broadcast program audio signal of order, and broadcast program audio signal is wherein carried out exporting after power amplification,Urgent broadcast signal is wherein decoded simultaneously, trigger radio and receive described urgent broadcast signal.
Further, described dispensing device comprises: program gap detecting module, delay circuit module, double-toneMultifrequency coding module and signaling are broadcast control module composition; Wherein,
Described program gap detecting module, for the broadcast program audio signal of input is carried out to gap detecting,When detecting while being greater than the program gap phase of the first scheduled time length or the gap of statement in broadcast program, controlMake described double-tone multi-frequency coding module and produce the dual-tone multifrequency urgent broadcast letter that continues the second scheduled time lengthOrder;
Described delay circuit module, for keeping for the 3rd scheduled time long to the broadcast program audio signal of inputThe time delay of degree;
Described signaling is broadcast control module, broadcasts by predetermined frequency for controlling described double-tone multi-frequency coding moduleDual-tone multifrequency urgent broadcast signaling;
Described double-tone multi-frequency coding module, for producing and continue under the control at described program gap detecting moduleThe dual-tone multifrequency urgent broadcast signaling of the second scheduled time length the control of broadcasting control module in described signalingUnder broadcast by predetermined frequency, interim or statement in the program gap that is greater than the first scheduled time lengthIn gap, insert described dual-tone multifrequency urgent broadcast signaling, with the broadcast joint of time delay the 3rd scheduled time lengthOrder audio signal is mixed rear output;
Further, described dispensing device also comprises:
Error correction code module, for carrying out Error Correction of Coding protection to the described dual-tone multifrequency urgent broadcast signaling of inserting.
Further, described receiving system specifically comprises:
Described broadcast reception module is urgent wide for receiving being mixed with of described double-tone multi-frequency coding module outputBroadcast the broadcast singal of signaling and broadcast program audio signal, send broadcast program audio signal wherein to soundFrequently power amplifier module sends the urgent broadcast signal demodulating to dual-tone multifrequency decoder module simultaneously;
Described audio frequency power amplifier module, for the broadcast program audio frequency letter to receiving from described broadcast reception moduleNumber carry out exporting after power amplification;
Described dual-tone multifrequency decoder module, for the urgent broadcast letter to receiving from described broadcast reception moduleNumber decode, and trigger power management module and start audio frequency power amplifier module to power;
Described power management module, for powering to described audio frequency power amplifier module.
The present invention also provides a kind of method that realizes amplitude modulation medium-wave urgent broadcast, and described method is utilized a kind of realThe system of existing amplitude modulation medium-wave urgent broadcast, described method comprises:
Dispensing device, in the gap phase of broadcast program audio signal or the gap of statement, is dynamically inserted by demandEnter dual-tone multifrequency urgent broadcast signaling, and output after mixing with described broadcast program audio signal;
Receiving system includes the wide of dual-tone multifrequency urgent broadcast signaling what receive the output of described dispensing deviceBroadcast after program audio signal, broadcast program audio signal is wherein carried out exporting after power amplification, will simultaneouslyUrgent broadcast signal is wherein decoded, and triggers radio and receives described urgent broadcast signal.
Further, described steps A specifically comprises:
Delay circuit module keeps the time of the 3rd scheduled time length to prolong to the broadcast program audio signal of inputLate;
Program gap detecting module carries out gap detecting to the broadcast program audio signal of input, when detecting broadcastWhile being greater than the program gap phase of the first scheduled time length or the gap of statement in program, control dual-tone multifrequencyCoding module produces the dual-tone multifrequency urgent broadcast signaling that continues the second scheduled time length;
Double-tone multi-frequency coding module produces and continues the second pre-timing under the control of described program gap detecting moduleBetween length dual-tone multifrequency urgent broadcast signaling and broadcast in described signaling under the control of control module by frequently predeterminedDegree is broadcast, and in the gap of or statement interim in the program gap that is greater than the first scheduled time length, insertsDual-tone multifrequency urgent broadcast signaling, carries out with the broadcast program audio signal of time delay the 3rd scheduled time lengthOutput after mixing.
Further, before the described dual-tone multifrequency urgent broadcast signaling of insertion, described steps A also comprises:
Error correction code module is carried out Error Correction of Coding protection to described dual-tone multifrequency urgent broadcast signaling.
Further, described step B specifically comprises:
Broadcast reception module is mixed with urgent broadcast signaling what receive the output of described double-tone multi-frequency coding moduleAfter the broadcast singal of broadcast program audio signal, send broadcast program audio signal wherein to audio frequency meritAmplification module sends the urgent broadcast signal demodulating to dual-tone multifrequency decoder module simultaneously;
Described audio frequency power amplifier module is carried out the broadcast program audio signal receiving from described broadcast reception moduleAfter power amplification, export; Described dual-tone multifrequency decoder module is urgent to what receive from described broadcast reception moduleBroadcast singal is decoded, and triggers power management module and start audio frequency power amplifier module to power.
Wherein, described the second scheduled time length is the lasting time span of touch-tone signal according to the rulesDetermine, span is 40 milliseconds～50 milliseconds; Described the first scheduled time length and the 3rd scheduled timeLength need to be determined according to the second scheduled time length.
Beneficial effect of the present invention is as follows:
The present invention utilizes antijamming capability and higher transmission speed, the strictly insertion that touch-tone signal is very strongIn the middle of broadcast program gap, overcome the user's receiving emergent broadcast information in time existing in prior artProblem.
Other features and advantages of the present invention will be set forth in the following description, and, part from explanationIn book, become apparent, or understand by implementing the present invention. Object of the present invention and other advantages canRealize and obtain by specifically noted structure in write description, claims and accompanying drawing.
Brief description of the drawings
Fig. 1 is the structural representation of system described in the embodiment of the present invention;
Fig. 2 is the schematic flow sheet of method described in the embodiment of the present invention;
Fig. 3 is described in the embodiment of the present invention in method, the schematic flow sheet of process of transmitting;
Fig. 4 is described in the embodiment of the present invention in method, the schematic flow sheet of receiving course.
Detailed description of the invention
Specifically describe the preferred embodiments of the present invention below in conjunction with accompanying drawing, wherein, accompanying drawing forms the application onePart, and together with embodiments of the present invention for explaining principle of the present invention. For purpose of clarity and simplification,In the time that it may make theme of the present invention smudgy, will omit in device described herein known function andIllustrating in detail of structure.
First described in 1 pair of embodiment of the present invention, system is elaborated, by reference to the accompanying drawings.
As shown in Figure 1, Fig. 1 is the structural representation of system described in the embodiment of the present invention, specifically comprises: send outSend device and receiving system, wherein, dispensing device specifically comprises: delay circuit module, the detecting of program gapModule, DTMF (DoubleToneMultiFrequency, dual-tone multifrequency) coding module, error correction code moduleBroadcast control module with signaling, receiving system comprises: broadcast reception module, audio frequency power amplifier module, voltage pipeReason module and DTMF decoder module; Receiving system specifically comprises: broadcast reception module, audio frequency power amplifier moduleWith DTMF decoder module.
(1) dispensing device, is mainly responsible in the gap phase of broadcast program audio signal or the gap of statementIn, dynamically insert dual-tone multifrequency urgent broadcast signaling by demand, and mix with described broadcast program audio signalRear output;
Dispensing device specifically comprises: delay circuit module, program gap detecting module, dtmf code module,Error correction code module and signaling are broadcast control module, and receiving system comprises: broadcast reception module, audio frequency power amplifier mouldPiece, voltage management module and DTMF decoder module, wherein,
Program gap detecting module, carries out gap detecting to the broadcast program audio signal of input, wide when detectingBroadcast the program gap that is greater than the first scheduled time length (being set as 50 milliseconds in the embodiment of the present invention) in programThe gap of phase or statement, and control dtmf code module generation DTMF urgent broadcast signaling in good time, holdThe continuous time is the second scheduled time length (being set as 40 milliseconds in the embodiment of the present invention);
Delay circuit module, keeps the 3rd scheduled time length (this to the broadcast program audio signal of inputIn bright embodiment, be set as 45 milliseconds) time delay;
Signaling is broadcast control module, for example controls dtmf code module, by predetermined frequency (average 5 seconds 1Inferior) broadcast and continue the urgent broadcast signaling of 40 milliseconds;
Dtmf code module produces the DTMF that continues 40 milliseconds under the control of program gap detecting moduleUrgent broadcast signaling is also broadcast in signaling under the control of control module and is broadcast by predetermined frequency, is being greater than 50In the gap of the interim or statement in program gap of millisecond, insert described DTMF urgent broadcast signaling, and prolongTime the broadcast program audio signal of 45 milliseconds mix and export;
Error correction code module, as an optional functional module, for urgent to the described dual-tone multifrequency of insertingBroadcast signaling carries out Error Correction of Coding protection, and the transmission that can further strengthen DTMF urgent broadcast signaling is reliableProperty;
(2) receiving system, main be responsible for receiving described dispensing device output to include dual-tone multifrequency urgentThe broadcast program audio signal of broadcast signaling, and broadcast program audio signal is wherein carried out after power amplificationOutput is decoded urgent broadcast signal wherein simultaneously, triggers radio and receives described urgent broadcast letterNumber;
Receiving system specifically comprises: broadcast reception module, audio frequency power amplifier module and DTMF decoder module, itsIn,
Broadcast reception module, what transmission and reception apparatus was exported is mixed with urgent broadcast signaling and broadcast program audio frequencyThe broadcast singal of signal, sends broadcast program audio signal wherein to audio frequency power amplifier module, will separate simultaneouslyThe urgent broadcast signal recalling sends DTMF decoder module to;
Audio frequency power amplifier module, carries out exporting after power amplification for the broadcast program audio signal to receiving;
DTMF decoder module, decodes to urgent broadcast signal, and trigger power management module start rightAudio frequency power amplifier module is powered;
Power management module, for powering to audio frequency power amplifier module.
Method described in the embodiment of the present invention is elaborated to accompanying drawing 4 below in conjunction with accompanying drawing 2.
As shown in Figure 2, Fig. 2 is the schematic flow sheet of method described in the embodiment of the present invention, the embodiment of the present inventionDescribed method is utilized the system described in Fig. 1, specifically can comprise the following steps:
Step 201: dispensing device is in the gap phase of broadcast program audio signal or the gap of statement, as requiredAsk dynamic insertion dual-tone multifrequency urgent broadcast signaling, and output after mixing with described broadcast program audio signal;
Step 202: receiving system includes dual-tone multifrequency urgent broadcast what receive the output of described dispensing deviceAfter the broadcast program audio signal of signaling, broadcast program audio signal is wherein carried out exporting after power amplification,Urgent broadcast signal is wherein decoded simultaneously, trigger radio and receive described urgent broadcast signal.
As shown in Figure 3, Fig. 3 is step 201, i.e. the schematic flow sheet of process of transmitting, specifically can comprise asLower step:
Step 301: delay circuit module keeps the time of 45 milliseconds to prolong to the broadcast program audio signal of inputLate;
Step 302: with step 301 while, the broadcast program audio signal of program gap detecting module to inputCarry out gap detecting, in the time detecting the gap that is not less than gap phase of 50 milliseconds and statement in broadcast program, holdRow step 303;
Step 303: program gap detecting module control dtmf code module produces DTMF urgent broadcast letterOrder, the signaling duration is 40 milliseconds, broadcasts frequency and broadcasts control module by signaling and control that (signaling is broadcastFrequency can be controlled in average 5 second 1 time);
Step 304: insert DTMF promptly wide in the gap that is greater than the program gap of 50 milliseconds or statementBroadcast signaling, mix with the broadcast program audio signal of 45 milliseconds of time delays;
Step 305: the DTMF urgent broadcast signaling of inserting is carried out to optional error correcting code coding protection;
Step 306: the audio signal that is inserted with DTMF urgent broadcast signaling is exported;
Step 307: broadcast reception module is mixed with urgent broadcast signaling and broadcast program sound what receive outputFrequently after the broadcast singal of signal, send broadcast program audio signal wherein to audio frequency power amplifier module, simultaneouslySend the urgent broadcast signal demodulating to DTMF decoder module;
Step 308: audio frequency power amplifier module is carried out after power amplification defeated to the broadcast program audio signal receivingGo out;
Step 309:DTMF decoder module is decoded to urgent broadcast signal, and triggers power management moduleStart audio frequency power amplifier module to power.
As shown in Figure 4, Fig. 4 is step 202, i.e. the schematic flow sheet of receiving course, specifically can comprise asLower step:
Step 401: broadcast reception module is receiving being mixed with promptly of described double-tone multi-frequency coding module outputAfter the broadcast singal of broadcast signaling and broadcast program audio signal, by broadcast program audio signal transmission whereinGive audio frequency power amplifier module, send the urgent broadcast signal demodulating to dual-tone multifrequency decoder module simultaneously;
Step 402: described audio frequency power amplifier module is to the broadcast program audio frequency receiving from described broadcast reception moduleSignal carries out exporting after power amplification;
Step 403: described dual-tone multifrequency decoder module is to the urgent broadcast receiving from described broadcast reception moduleSignal is decoded, and triggers power management module and start audio frequency power amplifier module to power.
It should be noted that, 40 milliseconds that in above technical scheme, mention is according to CCITT (Consultive Committee International Telegraph and TelephoneWords Advisory Board) the lasting minimum time length of dtmf signal of regulation, the embodiment of the present invention not onlyOnly be limited to 40 milliseconds, generally can between 40 milliseconds～50 milliseconds, select; The time delay of 45 millisecondsBe to come surely according to the dtmf signal duration length of 40 milliseconds, 5 milliseconds of extending are in order to have one moreIndividual Time Guard Interval, is also not only confined to 5 milliseconds; Be not less than gap phase of 50 milliseconds and statement betweenIt is fixed that gap is mainly also come according to dtmf signal duration length, and concrete length can be according to actual needsSet.
In sum, the embodiment of the present invention provides a kind of system and method for realizing amplitude modulation medium-wave urgent broadcast,Utilize antijamming capability that dtmf signal is very strong and higher transmission speed, strictly insert broadcast program gapIn the middle of (time span can not be less than 50 milliseconds), although can hear, because the duration is extremely short by (40Millisecond), repetition frequency degree extremely low (5 seconds 1 time), negligible on the impact of program quality when actual use.And consider current DTMF decoding chip large-scale production, cost is extremely low, can be extended to urgent wideBroadcast commercial application. And in the embodiment of the present invention, even in the time of radio power-off, also can be by electricitySource control module starts audio frequency power amplifier module and plays urgent broadcast content; If AM radio is playOther broadcast program, described device, under the control of urgent broadcast signaling, also can interrupt normal broadcast program and broadcastPut, intercut emergency broadcast message, ensure that user can receive instant emergency broadcast message.
The above be only preferably detailed description of the invention of the present invention, but protection scope of the present invention is not limited toThis, any be familiar with those skilled in the art the present invention disclose technical scope in, can expect easilyVariation or replacement, within all should being encompassed in protection scope of the present invention. Therefore, protection scope of the present inventionShould be as the criterion with the protection domain of claims.
Claims (6)
1. a system that realizes amplitude modulation medium-wave urgent broadcast, is characterized in that, comprising: dispensing device and receiving system, wherein,
Described dispensing device, for the gap phase in broadcast program audio signal or the gap of statement, dynamically inserts dual-tone multifrequency urgent broadcast signaling by demand, and output after mixing with described broadcast program audio signal;
Described receiving system, for receiving the broadcast program audio signal that includes dual-tone multifrequency urgent broadcast signaling of described dispensing device output, and broadcast program audio signal is wherein carried out exporting after power amplification, urgent broadcast signal is wherein decoded simultaneously, trigger radio and receive described urgent broadcast signal;
Described dispensing device comprises: program gap detecting module, delay circuit module, double-tone multi-frequency coding module and signaling are broadcast control module; Wherein,
Described program gap detecting module, for the broadcast program audio signal of input is carried out to gap detecting, when detecting while being greater than the program gap phase of the first scheduled time length or the gap of statement in broadcast program, control described double-tone multi-frequency coding module and produce the dual-tone multifrequency urgent broadcast signaling that continues the second scheduled time length;
Described delay circuit module, for keeping the time delay of the 3rd scheduled time length to the broadcast program audio signal of input;
Described signaling is broadcast control module, broadcasts dual-tone multifrequency urgent broadcast signaling for controlling described double-tone multi-frequency coding module by predetermined frequency;
Described double-tone multi-frequency coding module, broadcast by predetermined frequency for producing under the control of described program gap detecting module under the control that continues the dual-tone multifrequency urgent broadcast signaling of the second scheduled time length and broadcast control module in described signaling, in the gap of or statement interim in the program gap that is greater than the first scheduled time length, insert described dual-tone multifrequency urgent broadcast signaling, mix rear output with the broadcast program audio signal of time delay the 3rd scheduled time length;
Wherein, described the second scheduled time length is that the lasting time span of touch-tone signal is according to the rules determined, span is 40 milliseconds～50 milliseconds; Described the first scheduled time length and the 3rd scheduled time length need to be determined according to the second scheduled time length.
2. system according to claim 1, is characterized in that, described dispensing device also comprises:
Error correction code module, for carrying out Error Correction of Coding protection to the described dual-tone multifrequency urgent broadcast signaling of inserting.
3. system according to claim 1, is characterized in that, described receiving system specifically comprises:
Broadcast reception module, for receiving the broadcast singal that is mixed with urgent broadcast signaling and broadcast program audio signal of described double-tone multi-frequency coding module output, send broadcast program audio signal wherein to audio frequency power amplifier module, send the urgent broadcast signal demodulating to dual-tone multifrequency decoder module simultaneously;
Described audio frequency power amplifier module, for carrying out exporting power amplification to the broadcast program audio signal receiving from described broadcast reception module;
Described dual-tone multifrequency decoder module, for the urgent broadcast signal receiving from described broadcast reception module is decoded, and triggers power management module and starts audio frequency power amplifier module to power;
Described power management module, for powering to described audio frequency power amplifier module.
4. a method that realizes amplitude modulation medium-wave urgent broadcast, is characterized in that, utilizes a kind of system that realizes amplitude modulation medium-wave urgent broadcast, and described method comprises:
Dispensing device, in the gap phase of broadcast program audio signal or the gap of statement, dynamically inserts dual-tone multifrequency urgent broadcast signaling by demand, and output after mixing with described broadcast program audio signal;
Receiving system is receiving after the broadcast program audio signal that includes dual-tone multifrequency urgent broadcast signaling of described dispensing device output, broadcast program audio signal is wherein carried out exporting after power amplification, urgent broadcast signal is wherein decoded simultaneously, trigger radio and receive described urgent broadcast signal;
Described step dispensing device, in the gap phase of broadcast program audio signal or the gap of statement, dynamically inserts dual-tone multifrequency urgent broadcast signaling by demand, and after mixing with described broadcast program audio signal, output specifically comprises:
Delay circuit module keeps the time delay of the 3rd scheduled time length to the broadcast program audio signal of input;
Program gap detecting module carries out gap detecting to the broadcast program audio signal of input, when detecting while being greater than the program gap phase of the first scheduled time length or the gap of statement in broadcast program, control double-tone multi-frequency coding module and produce the dual-tone multifrequency urgent broadcast signaling that continues the second scheduled time length;
Double-tone multi-frequency coding module produces under the control that continues the dual-tone multifrequency urgent broadcast signaling of the second scheduled time length and broadcast control module in described signaling and broadcasts by predetermined frequency under the control of described program gap detecting module, in the gap of or statement interim in the program gap that is greater than the first scheduled time length, insert dual-tone multifrequency urgent broadcast signaling, mix rear output with the broadcast program audio signal of time delay the 3rd scheduled time length;
Wherein, described the second scheduled time length is that the lasting time span of touch-tone signal is according to the rules determined, span is 40 milliseconds～50 milliseconds; Described the first scheduled time length and the 3rd scheduled time length need to be determined according to the second scheduled time length.
5. method according to claim 4, be characterised in that, before the described dual-tone multifrequency urgent broadcast signaling of insertion, described step dispensing device is in the gap phase of broadcast program audio signal or the gap of statement, dynamically insert dual-tone multifrequency urgent broadcast signaling by demand, and after mixing with described broadcast program audio signal, output also comprises:
Error correction code module is carried out Error Correction of Coding protection to described dual-tone multifrequency urgent broadcast signaling.
6. method according to claim 4, it is characterized in that, described step receiving system is receiving after the broadcast program audio signal that includes dual-tone multifrequency urgent broadcast signaling of described dispensing device output, broadcast program audio signal is wherein carried out exporting after power amplification, urgent broadcast signal is wherein decoded, triggering radio receives described urgent broadcast signal and specifically comprises simultaneously:
Broadcast reception module is receiving after the broadcast singal that is mixed with urgent broadcast signaling and broadcast program audio signal of described double-tone multi-frequency coding module output, send broadcast program audio signal wherein to audio frequency power amplifier module, send the urgent broadcast signal demodulating to dual-tone multifrequency decoder module simultaneously;
Described audio frequency power amplifier module carries out exporting power amplification to the broadcast program audio signal receiving from described broadcast reception module; Described dual-tone multifrequency decoder module is decoded to the urgent broadcast signal receiving from described broadcast reception module, and triggers power management module and start audio frequency power amplifier module to power.
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| CN106471814B (en) * | 2014-07-08 | 2020-02-07 | 索尼公司 | Transmission device, transmission method, reception device, and reception method |
| CN105656583B (en) * | 2016-04-08 | 2018-08-31 | 苏州东奇信息科技股份有限公司 | A kind of medium wave emergency broadcase system |
| US11178640B2 (en) | 2016-09-30 | 2021-11-16 | Telefonaktiebolaget Lm Ericsson (Publ) | Methods and devices for broadcast signaling transmission |
| CN108810185B (en) * | 2018-06-01 | 2021-08-24 | 镇江乾坤传媒科技有限公司 | Distribution and addressing coding method for data transmission under digital medium wave channel |
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| CN1192614A (en) * | 1997-03-03 | 1998-09-09 | 索尼公司 | Audio data transmission apparatus and method, audio data recording apparatus, and audio data recording medium |
| CN101651507A (en) * | 2008-08-15 | 2010-02-17 | 威盛电子(中国)有限公司 | Method and system for securely playing multimedia broadcast content and multimedia broadcast system |
| CN101702626A (en) * | 2009-11-06 | 2010-05-05 | 徐汉阳 | Cassette automatic recorder for listening behavior of frequency and amplitude modulating broadcast |
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| JP2010268226A (en) * | 2009-05-14 | 2010-11-25 | Toshiba Corp | Broadcasting receiver |
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| CN1192614A (en) * | 1997-03-03 | 1998-09-09 | 索尼公司 | Audio data transmission apparatus and method, audio data recording apparatus, and audio data recording medium |
| CN101651507A (en) * | 2008-08-15 | 2010-02-17 | 威盛电子(中国)有限公司 | Method and system for securely playing multimedia broadcast content and multimedia broadcast system |
| CN101702626A (en) * | 2009-11-06 | 2010-05-05 | 徐汉阳 | Cassette automatic recorder for listening behavior of frequency and amplitude modulating broadcast |
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