CN204350002U - A kind of digital watermark detector of frequency modulation broadcast system - Google Patents
A kind of digital watermark detector of frequency modulation broadcast system Download PDFInfo
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- CN204350002U CN204350002U CN201520053065.2U CN201520053065U CN204350002U CN 204350002 U CN204350002 U CN 204350002U CN 201520053065 U CN201520053065 U CN 201520053065U CN 204350002 U CN204350002 U CN 204350002U
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Abstract
The utility model provides a kind of digital watermark detector of frequency modulation broadcast system, comprise to audio frequency monitoring point embedded in program source mark analog broadcasting audio program streams sample and obtain the Audio interface block of PCM sample value signal, described Audio interface block is connected with and receives its PCM sample value signal of obtaining of sampling and carry out frequency domain conversion and obtain frequency domain PCM sample value signal and compare with the synchronous described digital audio frequency watermark sequence using same key to generate detecting that the watermark detection module that program source identifies connects, described watermark detection module is connected with the program source detected mark is compared and the information reporting module reporting comparison information to report with correct program source information, described Audio interface block, watermark detection module and information reporting module all with by powering after direct current step-down to be connected to the power module of each module.
Description
Technical field
The utility model belongs to communication technical field, relates to a kind of digital watermark detector of frequency modulation broadcast system.
Background technology
Along with the development of broadcast television technique and New Media Technology, existing broadcast presents multimedia modality, and the demand of broadcast program contents also increases gradually, and this supervision for broadcasted content is had higher requirement.Under this background, being incorporated into by digital watermark technology in broadcast safe supervisory control system is a kind of effective technological means, can solve copyright protection well, mistake is broadcast, illegally intercut and the problem such as interference.Digital watermark technology is a branch of Information Hiding Techniques, is widely applied to audio frequency and video field in recent years, is mainly used in the intellectual property protection of digital media products and false proof.In audio droadcasting system, Digital Audio Watermarking Techniques refer to the method for the signal transacting when not affecting original audio quality embed in digitized voice data have certain sense (copyright or program identification) and easily through specific detectors extract technology, this mark is normally invisible, non, only has and can be extracted by special watermark detector.
Summary of the invention
The utility model provides that a kind of whether correct and report the digital watermark detector of the frequency modulation broadcast system of error message not affect the reliable Detection achieving audio watermarking under any reality broadcasts the condition of effect and broadcast quality if carrying out analog broadcasting audio program streams that Real-Time Monitoring broadcasts.
The technical solution adopted in the utility model is:
A kind of digital watermark detector of frequency modulation broadcast system, it is characterized in that: comprise to audio frequency monitoring point embedded in program source mark analog broadcasting audio program streams sample and obtain the Audio interface block of PCM sample value signal, described Audio interface block is connected with and receives its PCM sample value signal of obtaining of sampling and carry out frequency domain conversion and obtain frequency domain PCM sample value signal and compare with the synchronous described digital audio frequency watermark sequence using same key to generate detecting that the watermark detection module that program source identifies connects, described watermark detection module is connected with the program source detected mark is compared and the information reporting module reporting comparison information to report with correct program source information, described Audio interface block, watermark detection module and information reporting module all with by powering after direct current step-down to be connected to the power module of each module.The utility model controls the audio program streams of watermarked (the audio program source mark) of subaudio frequency interface module sampled analog stereo left and right acoustic channels form in watermark detection module, be converted to PCM sample value signal, in watermark detection module, the synchronous digital audio frequency watermark sequence of same key generation and the PCM sample value signal of using carries out related operation, detect that program source identifies, finally by information reporting module, the program source of detection mark is compared, by watermark detection State-output to warning client with correct program source information.
Further, the acp chip of described watermark detection module is the dsp processor of a DM642.
Further, the acp chip of described Audio interface block is TLV320AIC23B chip.
Further, described information reporting module comprises the TL16C752B serial port module reporting comparison information to report.
Further, the acp chip of described power module adopts MAX1951 power supply chip.
The beneficial effects of the utility model: this digital watermark detecting device achieves the reliable Detection of audio watermarking under any reality broadcasts the condition of effect and broadcast quality not affect, whether the analog broadcasting audio program streams that Real-Time Monitoring broadcasts is correct and report error message.
Accompanying drawing explanation
Fig. 1 is theory diagram of the present utility model.
Fig. 2 is process chart of the present utility model.
Fig. 3 is the circuit diagram of Audio interface block of the present utility model.
Fig. 4 is the circuit diagram of serial port module of the present utility model.
Embodiment
Below in conjunction with specific embodiment, the utility model is further described, but the utility model is not confined to these embodiments.One skilled in the art would recognize that the utility model covers all alternatives, improvement project and the equivalents that may comprise in Claims scope.
See Fig. 1, Fig. 2, a kind of digital watermark detector of frequency modulation broadcast system, comprise to audio frequency monitoring point embedded in program source mark analog broadcasting audio program streams sample and obtain the Audio interface block 2 of PCM sample value signal, described Audio interface block is connected with and receives its PCM sample value signal of obtaining of sampling and carry out frequency domain conversion and obtain frequency domain PCM sample value signal and compare with the synchronous described digital audio frequency watermark sequence using same key to generate detecting that the watermark detection module 1 that program source identifies connects, described watermark detection module 1 is connected with the program source detected mark is compared and the information reporting module 3 reporting comparison information to report with correct program source information, described Audio interface block 2, watermark detection module 1 and information reporting module 3 all with by powering after direct current step-down to be connected to the power module 4 of each module.The utility model controls the audio program streams of watermarked (the audio program source mark) of subaudio frequency interface module 2 sampled analog stereo left and right acoustic channels form in watermark detection module 1, be converted to PCM sample value signal, in watermark detection module 1, the synchronous digital audio frequency watermark sequence of same key generation and the PCM sample value signal of using carries out related operation, detect that program source identifies, finally by information reporting module 3, the program source of detection mark is compared, by watermark detection State-output to warning client with correct program source information.
The acp chip of watermark detection module 1 described in the present embodiment is the dsp processor of a DM642.
The acp chip of Audio interface block 2 described in the present embodiment is TLV320AIC23B chips.
Information reporting module 3 described in the present embodiment comprises the TL16C752B serial port module reporting comparison information to report.
The acp chip of power module 4 described in the present embodiment adopts MAX1951 power supply chip.
+ 5V DC power supply input of the present utility model carries out voltage 3.3V and 1.4V needed for step-down generation dsp processor, TLV320AIC23B chip and TL16C752B serial port module through MAX1951 power supply chip.The clock of TLV320AIC23B chip is 18.432MHz, 48kHz sample frequency is produced through frequency division, audio frequency inputs through LINE IN mode, adopt I2C control interface, TLV320AIC23B chip is configured to the wide and DSP mode mode of operation of master pattern, 16bits word, under frame synchronizing signal effect, first transmit L channel, transmit R channel again, highest significant position (MSB) is front, and its physical circuit figure as shown in Figure 3.The input clock of TL16C752B serial port module is 29.4912MHz, and connect dsp processor and MAX3232C chip, complete serial data constrained input, its physical circuit figure as shown in Figure 4.
Real-time listening TL16C752B serial port module under dsp processor controls, is provided with the configuration with the PN sequence of watermark embedment same key according to user.The audio program streams of watermarked (the audio program source mark) of TLV320AIC23B chip sampled analog stereo left and right acoustic channels form, be converted to the PCM sample value signal of 8192, have no progeny in generation, PN sequence and PCM watermark audio signal related operation, normalized correlation, finds correlation peak and compares with the threshold value of setting, complete detecting algorithm, watermark detected when correlation peak is greater than threshold value, otherwise watermark do not detected.Dsp processor exports to warning client watermark detection state by TL16C752B serial port module according to querying command, the watermarked audio signal of sampling is exported to monitor by TLV320AIC23B chip simultaneously.
Claims (5)
1. the digital watermark detector of a frequency modulation broadcast system, it is characterized in that: comprise to audio frequency monitoring point embedded in program source mark analog broadcasting audio program streams sample and obtain the Audio interface block of PCM sample value signal, described Audio interface block is connected with and receives its PCM sample value signal of obtaining of sampling and carry out frequency domain conversion and obtain frequency domain PCM sample value signal and compare with the synchronous described digital audio frequency watermark sequence using same key to generate detecting that the watermark detection module that program source identifies connects, described watermark detection module is connected with the program source detected mark is compared and the information reporting module reporting comparison information to report with correct program source information, described Audio interface block, watermark detection module and information reporting module all with by powering after direct current step-down to be connected to the power module of each module.
2. the digital watermark detector of a kind of frequency modulation broadcast system according to power 1, is characterized in that: the acp chip of described watermark detection module is the dsp processor of a DM642.
3. the digital watermark detector of a kind of frequency modulation broadcast system according to power 1, is characterized in that: the acp chip of described Audio interface block is TLV320AIC23B chip.
4. the digital watermark detector of a kind of frequency modulation broadcast system according to power 1, is characterized in that: described information reporting module comprises the TL16C752B serial port module reporting comparison information to report.
5. according to the digital watermark detector of a kind of frequency modulation broadcast system one of power 1 ~ 4 Suo Shu, it is characterized in that: the acp chip of described power module adopts MAX1951 power supply chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520053065.2U CN204350002U (en) | 2015-01-26 | 2015-01-26 | A kind of digital watermark detector of frequency modulation broadcast system |
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| CN201520053065.2U CN204350002U (en) | 2015-01-26 | 2015-01-26 | A kind of digital watermark detector of frequency modulation broadcast system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107799121A (en) * | 2017-10-18 | 2018-03-13 | 广州珠江移动多媒体信息有限公司 | A kind of digital watermark embedding and method for detecting of radio broadcasting audio |
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2015
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107799121A (en) * | 2017-10-18 | 2018-03-13 | 广州珠江移动多媒体信息有限公司 | A kind of digital watermark embedding and method for detecting of radio broadcasting audio |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150520 |