CN109584890A - Audio frequency watermark insertion, extraction, television program interaction method and device - Google Patents
Audio frequency watermark insertion, extraction, television program interaction method and device Download PDFInfo
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- 238000000605 extraction Methods 0.000 title claims description 12
- 230000005236 sound signal Effects 0.000 claims abstract description 107
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
- G10L19/00—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
- G10L19/018—Audio watermarking, i.e. embedding inaudible data in the audio signal
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
- G10L25/00—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00
- G10L25/03—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00 characterised by the type of extracted parameters
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
- G10L25/00—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00
- G10L25/45—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00 characterised by the type of analysis window
Abstract
Audio frequency watermark insertion, extracting method and television program interaction method, device, embedding grammar include: to be segmented to original audio signal and carry out time-frequency conversion；Watermark information is utilized respectively the watermark spreading sequence prestored with synchronizing information, is embedded in every section audio signal after synchronous frequency expansion sequence is spread；The audio signal that inverse time-frequency conversion obtains carrying watermark information is carried out to the signal after embedding information.Extracting method includes: to obtain the embedded location of synchronizing information according to the audio signal that the synchronization frequency expansion sequence search prestored receives；The audio signal is segmented according to the synchronizing information and carries out time-frequency conversion and extracts watermark sequence；The watermark sequence extracted is carried out despreading processing using the watermark spreading sequence prestored and obtains watermark information.The robustness of the application audio signal is high, and the audio after capable of guaranteeing insertion watermark has good quality, while making audio signal more abundant, reduces distortion.
Description
Technical field
This application involves wireless communication technology fields, and in particular, to a kind of insertion of audio frequency watermark, extracting method and dress
It sets, television program interaction method and electronic equipment.
Background technique
The fast development of intelligent terminal technology, which enables mobile phone already, becomes the important tool of information transmitting, utilizes intelligent terminal
Microphone and loudspeaker can be communicated conveniently in air, therefore, in terms of mobile payment, message all
It can be widely used.The audio frequency watermark in TV signal especially is identified in intelligent terminal, is had when being interacted powerful
Advantage, and the audio frequency watermark of TV interaction requirement:
1) sound crosses air transmission, it is desirable that audio frequency watermark strong antijamming capability；
2) the distortion loss of sound wants small, almost allows human ear hearing that can not perceive；
3) mobile phone detection watermark is Blind watermarking detection, and the calculated performance of mobile phone is limited；
4) interaction requires real-time height；
Most of existing audio watermarking techniques, be made by the information of time domain or transform domain to audio certain modification come
It is embedded in watermark.Realized in time domain insertion watermark simple, and the embedded quantity of watermark is larger, but at this time the robustness of audio signal compared with
Low, safety is very poor.
To sum up, problem of the existing technology is:
After being embedded in watermark audio quality is poor, robustness is low.
Summary of the invention
A kind of insertion of audio frequency watermark, extracting method and device, television program interaction method are provided in the embodiment of the present application
And electronic equipment, to solve above-mentioned technical problem in the prior art.
According to the first aspect of the embodiment of the present application, a kind of audio frequency watermark embedding grammar is provided, comprising:
Original audio signal is segmented and carries out time-frequency conversion；
Watermark information is utilized respectively the watermark spreading sequence prestored with synchronizing information, after synchronous frequency expansion sequence is spread
It is embedded in every section audio signal；
The audio signal that inverse time-frequency conversion obtains carrying watermark information is carried out to the signal after embedding information.
According to the second aspect of the embodiment of the present application, a kind of audio frequency watermark extracting method is provided, comprising:
The embedded location of synchronizing information is obtained according to the audio signal that the synchronization frequency expansion sequence search prestored receives；
The audio signal is segmented according to the synchronizing information and carries out time-frequency conversion and extracts watermark sequence；
The watermark sequence extracted is carried out despreading processing and obtains watermark information using the watermark spreading sequence prestored.
In terms of according to the third of the embodiment of the present application, a kind of television program interaction method is provided, comprising:
Receive the audio signal under TV program watching environment；The audio signal includes utilizing audio water as described above
Print the watermark information of embedding grammar insertion；
The watermark information is extracted from the audio using audio frequency watermark extracting method as described above；
The watermark information is sent to server and receives the interactive information that server is returned according to the watermark information.
According to the 4th of the embodiment of the present application the aspect, a kind of audio frequency watermark flush mounting is provided, comprising: memory,
One or more processors, and one or more modules, one or more of modules are stored in the memory, and
It is configured to be executed by one or more of processors, one or more of modules include for executing audio as described above
The instruction of each step in watermark embedding method.
According to the 5th of the embodiment of the present application the aspect, a kind of audio frequency watermark extraction element is provided, comprising: memory,
One or more processors, and one or more modules, one or more of modules are stored in the memory, and
It is configured to be executed by one or more of processors, one or more of modules include for executing audio as described above
The instruction of each step in watermark extracting method.
According to the 6th of the embodiment of the present application the aspect, a kind of electronic equipment is provided, comprising: memory, one or more
A processor, and one or more modules, one or more of modules are stored in the memory, and are configured to
It is executed by one or more of processors, one or more of modules include for executing television program interaction as described above
The instruction of each step in method.
The technical solution provided in the embodiment of the present application provides a kind of spread-spectrum watermark, makes full use of different spread spectrum sequences
Irrelevance between column reduces interfering with each other between each watermarking components in each remixed audio, substantially increases watermark
The robustness of decoded accuracy, audio signal is high, and the audio after capable of guaranteeing insertion watermark has good quality, makes simultaneously
It is more abundant to obtain audio signal, reduces distortion.
Detailed description of the invention
The drawings described herein are used to provide a further understanding of the present application, constitutes part of this application, this Shen
Illustrative embodiments and their description please are not constituted an undue limitation on the present application for explaining the application.In the accompanying drawings:
Fig. 1 shows the flow diagram of the embodiment of the present application sound intermediate frequency watermark embedding method implementation；
Fig. 2 shows the schematic diagrames of the embodiment of the present application sound intermediate frequency signal subsection；
Fig. 3 shows the energy diagram of every section audio signal in the embodiment of the present application；
Fig. 4 shows the schematic diagram of the embodiment of the present application sound intermediate frequency signal subspace band transmission；
Fig. 5 shows the frame structure schematic diagram of embedding information in the embodiment of the present application；
Fig. 6 shows the flow diagram of the embodiment of the present application sound intermediate frequency watermark extracting method implementation；
Fig. 7 shows the flow diagram that television program interaction method is implemented in the embodiment of the present application；
Fig. 8 shows the schematic diagram of a scenario for carrying out television program interaction in the embodiment of the present application using audio frequency watermark；
Fig. 9 shows the process schematic of the embodiment of the present application sound intermediate frequency watermark insertion；
Figure 10 shows the process schematic of the embodiment of the present application sound intermediate frequency watermark extracting.
Specific embodiment
Scheme in the embodiment of the present application can be realized using various computer languages, for example, the program of object-oriented is set
Count language Java and literal translation formula scripting language JavaScript etc..
In order to which technical solution in the embodiment of the present application and advantage is more clearly understood, below in conjunction with attached drawing to the application
Exemplary embodiment be described in more detail, it is clear that described embodiment be only the application a part implement
Example, rather than the exhaustion of all embodiments.It should be noted that in the absence of conflict, embodiment and reality in the application
The feature applied in example can be combined with each other.
Embodiment 1
The embodiment of the present application provides a kind of audio frequency watermark embedding grammar, is illustrated below.
Fig. 1 shows the flow diagram of the embodiment of the present application sound intermediate frequency watermark embedding method implementation, as shown, described
Method includes:
Step 101 is segmented original audio signal and carries out time-frequency conversion；
Step 102, watermark information is utilized respectively with synchronizing information the watermark spreading sequence prestored, synchronous frequency expansion sequence into
Every section audio signal is embedded in after row spread spectrum；
Step 103 carries out the audio signal that inverse time-frequency conversion obtains carrying watermark information to the signal after embedding information.
In order to make algorithm that there is preferable robustness, before being embedded in watermark, original audio signal is segmented, watermark information is made
It is evenly distributed in audio signal.
Digital watermark technology can be divided into blind watermatking and non-blind watermatking: blind watermatking does not need initial carrier work at the extraction joins
According to；Rather than blind watermatking needs initial carrier as referring to the extraction that can be carried out watermark.Audio frequency watermark is all blind watermatking substantially.Modulation
Lapped transform (Lapped Transformation abbreviation MLT)) it is normally used for the block transformation volume in video and audio compression
Code.Perfect Reconstruction may be implemented in it, does not have block boundary effect, provides optimal property for the transition coding of many types signal
Energy.Complex modulation lapped transform (Complex Lapped Transformation abbreviation MCLT) is a simple extension of MLT
The advantages of being suggested, coming and save MLT.When it is implemented, the embodiment of the present application time-frequency conversion is carried out to audio signal can be with
Using MCLT.
A kind of spread-spectrum watermark is provided in the embodiment of the present application, is made full use of uncorrelated between different frequency expansion sequences
Property, interfering with each other between each watermarking components in each remixed audio is reduced, the decoded accuracy of watermark is substantially increased, sound
The robustness of frequency signal is high, and the audio after capable of guaranteeing insertion watermark has good quality, while making audio signal more
It is abundant, reduce distortion.
It is described that original audio signal is segmented in implementation, comprising:
The original audio signal S that sampling obtains is divided for multiple audio frames；Wherein, S={ x (i), 1≤i≤L }, x (i) table
Show the amplitude of ith sample point, L is the number of sampled point, and M is the length of every frame audio signal
The progress sub-frame processing of the multiple audio frame is obtained into multiple watermark windows, each watermark window includes preset quantity
Audio frame.
Fig. 2 shows the schematic diagrames of the embodiment of the present application sound intermediate frequency signal subsection, as shown, can be by default sampling frequency
The audio signal of rate, by preset quantity time sampling o'clock as an audio frame, each complete watermark window may include
Multiple audio frames, Shi Changwei cycle T, the embodiment of the present application can complete the insertion of information in time T.
Such as: assuming that sample frequency is 48KHz, every 1024 time samplings o'clock are as 1 audio frame, each complete water
Print window be 32 frames, Shi Changwei 1.365 seconds, then, the embodiment of the present application completes 16bit information (assuming that embedding in 1.365 seconds
The information entered be 16bit) insertion.
Assuming that the length of original audio signal every frame audio signal when being segmented is M, the value of M is to the good of audio embedded performance
It is bad to have a certain impact.In order to improve the perception transparency of insertion watermark, the audio signal after making to be embedded in watermark is not acoustically
Perceived, the embodiment of the present application can also be implemented in the following way.
In implementation, M value is 1024.
Every frame M takes 1024 in the embodiment of the present application, the audio signal of watermark is embedded in compared with original audio signal, in the sense of hearing
Upper difference is unobvious.
In implementation, the watermark information passes through forward error correction RS coding before embedding.
When it is implemented, watermark information is encoded by RS coding (Reed-solomon codes) by (6,4) RS,
The insertion watermark information of quasi- insertion is encoded by RS, so that being partially damaged in watermark information can also be decoded by redundant correcting,
Improve the correct verification and measurement ratio of watermark.
The all areas of audio signal are suitable for doing watermark insertion in view of not being, such as: it is almost noiseless in audio
Period is not suitable for doing the insertion of watermark information, and otherwise the correct verification and measurement ratio of watermark information can be very low after air transmits, therefore, this
Application embodiment can also be implemented in the following way.
In implementation, watermark information is utilized respectively the watermark spreading sequence prestored, synchronous spread spectrum with synchronizing information described
Sequence is embedded in front of every section audio signal after being spread, and further comprises:
Calculate the ENERGY E of every section audio signal；
ENERGY E is greater than preset energy threshold value ETAudio signal as audio signal to be embedded.
The embodiment of the present application can calculate the energy of every section audio signal, energy definition before embedding information first are as follows:
E=∑ | x (i) |, wherein x (i) indicates the amplitude of ith sample point.
Fig. 3 shows the energy diagram of every section audio signal in the embodiment of the present application, and the embodiment of the present application passes through setting
One threshold value ETTo determine whether the insertion of information is carried out to the section audio signal, when energy is more than ETWhen, then this window is
It is suitble to watermark insertion, otherwise the audio in this window is not handled.Threshold value is higher, and the robustness of watermark is stronger,
But the information load rate of watermark can be small.
In implementation, the watermark information and synchronizing information pass through key encryption before embedded audio signal, described
Key is to select to obtain from synchronizing information.
Key can be by control in the embodiment of the present application, and insertion side is known simultaneously with detection side, selects from synchronizing information
Identical key input is selected, to ensure the safety transmitted.
It is described that watermark information is utilized respectively the watermark spreading sequence prestored, synchronous spread spectrum sequence with synchronizing information in implementation
Column are embedded in every section audio signal after being spread, and carry out inverse time-frequency conversion to the signal after embedding information and obtain carrying watermark information
Audio signal, comprising:
Watermark information is spread with synchronizing information using watermark spreading sequence, the synchronous frequency expansion sequence prestored, is obtained
Sequence V after spread spectrums；
By the sequence V after spread spectrumsBe embedded into the real part of audio signal, to audio signal do that time-frequency conversion handles when
The real part of frequency transformation coefficient X (k) is quantified；
The audio signal of carrying watermark information is obtained after transformation coefficient after quantization is carried out inverse time-frequency conversionFor transformation coefficient.
When it is implemented, can be using a two-value random sequence wm as watermark information to be embedded.
The embodiment of the present application assumes that the sum of synchronizing information and watermark information are N total, chooses two sections of different m-sequence m1And m2
As frequency expansion sequence, wherein m1As the frequency expansion sequence to synchronous code, m2As the frequency expansion sequence to watermark information, to watermark sequence
Column S is spread, and the m-sequence of selection can be used as key.
The length M of frequency expansion sequence, the sequence after spread spectrum are Vs, length is N × M.
The minimum length of original audio is N × M, when it is implemented, avoiding MCLT intrinsic head when in order to be embedded in watermark
The length of original audio F can be taken as (N+2) × M, i.e. L=(N+2) × M by the error of two sections of tail generations, the embodiment of the present application.
Original audio F is segmented by length M, carries out MCLT transformation, obtaining transformation coefficient is X (k).
The embodiment of the present application is by the sequence V after spread spectrumsIt is embedded into the real part of signal, the real part of X (k) is quantified.
When it is implemented, the transformation due to MCLT has error at two sections of head and the tail, two sections of place head and the tail can not embedding data.
In implementation, the time-frequency conversion coefficient X (k) that time-frequency conversion is handled is done to audio signal are as follows:
Wherein,
N=1,2 ..., 2M, k=1,2 ..., M, M are transform length.
When it is implemented, the frame length of time-frequency conversion can be 1024, frame length 2M overlapping 50% is overlapped the time domain window letter used
Number is Hamming window h (n)=0.54-0.46cos (2 π nT), carries out time-frequency conversion after signal 50% is overlapped.
In implementation, the real part amount of progress that the time-frequency conversion coefficient X (k) that time-frequency conversion is handled is to audio signal
Change, comprising:
Wherein, { XiAnd { Xi' be respectively signal time-frequency conversion coefficient quantization before and after value,It represents to negative direction
Bracket function, d are the intensity factors for being embedded in watermark information.
Then, to { Xi' obtain after inverse MCLT transformation time-domain signal { x'(n) } after embedding information:
The value of d is human auditory system to the perception degree containing the watermark in close audio, its selection and insertion bandwidth, letter
It makes an uproar more related with the requirement of attack resistance than SNR.
In implementation, the intensity factor d=η ω of the insertion watermark information, wherein η is the frequency that signal transmits subband
Response factor, ω are in conjunction with human ear mental model masking curve model to the embedment strength different weights coefficient of each subband.
Audio signal passes through time-frequency conversion, carries out the analysis of different sub-band.
Assuming that using 32 subbands, the frequency response curve of different sub-band is different, and obtained response factor η is also different, η
=[η1,η2,…,η32]；It is in conjunction with embedment strength different weights coefficient of the human ear mental model masking curve model to each subband
ω=[w1,w2,…,w32], the comprehensive watermark intensity factor d=η ω=η of the overall situation of final decision masking1w1+η2w2+…+η32w32。
Fig. 4 shows the schematic diagram of the embodiment of the present application sound intermediate frequency signal subspace band transmission, as shown, the audio letter of input
It number can be transmitted by multi-channel filter.
For intermediate-freuqncy signal (such as: 2000Hz -8000Hz), due to sound sensitive, it is strong that lower watermark can be used
The factor is spent, is more conducive to transmit since energy ingredient is larger.
For high-frequency signal (such as: the higher watermark strength factor 16kHz -18kHz) can be used.
The specific time period that the embodiment of the present application can choose audio signal carries out information insertion, corresponding, filters in multichannel
On wave device, the operation that corresponding channel carries out the watermark strength factor can choose.
The requirement of imperceptibility after being embedded according to actual watermark, will at least reach the signal-to-noise ratio of 20dB or more, specific real
Shi Shi, the embodiment of the present application can use Subband Analysis Filter, analyze the frequency range of insertion watermark, according to different audios
The meeting adaptive change of time-frequency characteristic d intensity:
Here typical case's d intensity for listing Signal to Noise Ratio (SNR) in different dB values is illustrated:
| Signal to Noise Ratio (SNR) (dB) | Watermark embedment strength d |
| 20 | 0.043 |
| 25 | 0.025 |
| 30 | 0.012 |
| 35 | 0.006 |
When it is implemented, synchronizing information (being assumed to be 4bit) redundancy 4 can be obtained 14bit letter by the embodiment of the present application again
Breath is formed { syn (i) }；Watermark information (being assumed to be 16bit) is obtained 24bit, twice of redundancy through RS (6,4) Error Correction of Coding
Information obtains 48bit information, is formed { wm (i) }.
The length of the information { w (i) } { w (i) | w (i) ∈ { 1, -1 } } of every frame insertion is sequence { syn (i) } and { wm (i) }
The sum of length, i.e. 64bit.
Fig. 5 shows the frame structure schematic diagram of embedding information in the embodiment of the present application, as shown, synchronizing information be placed on it is whole
The front of a embedding information, watermark information are placed on the rear portion of embedding information.
The embodiment of the present application presses the length of synchronization signal and watermark information, and one section of long audio signal is segmented, will
After audio data segment, after making MCLT transformation to data segment, length L=(N+2) × M audio data, on specific coefficient of frequency
Watermark information insertion is carried out, to complete the insertion of a frame information { w (i) }, the frequency transformation of progress inverse time is obtained embedding after completion insertion
Enter the audio frequency watermark signal of information.
In implementation, the audio signal for carrying watermark informationAre as follows:
Wherein, w (i) is the information of insertion, rsFor random frequency expansion sequence, d is the watermark strength factor, xiFor original audio letter
Number,For the audio signal after embedding information.
Embodiment 2
Based on the same inventive concept, the embodiment of the present application provides a kind of audio frequency watermark extracting method, is illustrated below.
Fig. 6 shows the flow diagram of the embodiment of the present application sound intermediate frequency watermark extracting method implementation, as shown, described
Method includes:
Step 601 obtains the insertion of synchronizing information according to the audio signal that the synchronization frequency expansion sequence search prestored receives
Position；
The audio signal is segmented according to the synchronizing information and carries out time-frequency conversion and extracts watermark by step 602
Sequence；
Step 603 carries out despreading processing and obtains water to the watermark sequence extracted using the watermark spreading sequence prestored
Official seal breath.
The audio frequency watermark extraction scheme provided in the embodiment of the present application is embedded in since audio frequency watermark uses spread spectrum mode,
The irrelevance between different frequency expansion sequences is made full use of, is reduced mutual between each watermarking components in each remixed audio
Interference substantially increases the decoded accuracy of watermark, and the robustness of audio signal is high, can guarantee to be embedded in the audio tool after watermark
There is good quality, while making audio signal more abundant, reduces distortion.
In implementation, the audio signal that the synchronization frequency expansion sequence search that the basis prestores receives obtains the embedding of synchronizing information
Enter position, comprising:
The synchronous head byte of the audio signal received is extracted according to the synchronization frequency expansion sequence prestored；
The synchronization frequency expansion sequence being locally stored and the synchronous head byte are subjected to correlation processing, obtain synchronous spread spectrum sequence
Column；
It is slided around its position using the synchronous frequency expansion sequence and extracts correlation, obtain the embedding of synchronization signal
Enter position.
When it is implemented, with the synchronization spread spectrum code sequence known, (built-in end and extraction end can communicate in advance first
Determine) extract synchronous head do correlation respectively when decoding obtains synchronous head with all frequency expansion sequences of entire code book, obtain
Related maximum code sequence is to synchronize used spread spectrum code sequence；Further fine search synchronizes spreading code sequence with this
It is listed in sliding around this position and extracts correlation, obtain the insertion position that the maximum position of correlation is determined as synchronization signal
It sets.
When decoding, a synchronization threshold R can be setT, when decoding obtains synchronous head byte, and correlation result summation
R∑Greater than RTWhen, it is believed that complete synchronization.
Correlation result summation R∑It can be the adduction of the operation result of multiple redundancy processing, such as:
Assuming that synchronizing information has used the processing of four redundancies,
So, R∑Have:
R∑=R1+R2+R3+R4。
The embodiment of the present application is calculated by relevant search, gradually determines all embedded locations of synchronizing information, completes end
To the synchronizing information at end, so that later use synchronizing information carries out other operations.
In implementation, correlation calculates according to the following formula:
Wherein, xiFor main signal frame, rsFor pseudo-random sequence,It goes to zero,It is positive and negative
Value is determined by embedding information w (i).
Due to main signal frame xiWith pseudo-random sequence rsIt is independent from each other, so the first half of above-mentioned formulaIt can go to zero.And the second part of formula has a bigger kurtosis amplitude, positive and negative values are believed by insertion
Position w (i) is ceased to determine.
In view of audio frequency watermark may be by flexible influence on a timeline in communication process, the embodiment of the present application is also
It can implement in the following way.
In implementation, after obtaining the embedded location of synchronizing information, further comprise:
According between two synchronizing informations audio length and watermark information be embedded in when two synchronizing informations between it is known
Original audio length, calculate contraction-expansion factor；
Linear extendible recovery is carried out to the audio signal according to the contraction-expansion factor.
The embodiment of the present application proposes the watermark extracting method restored based on linear extendible while using synchronizing information,
Be specifically as follows: by search two synchronous codes, according between them audio length and watermark be embedded in when two synchronous codes
Between known original audio length calculate contraction-expansion factor, and then carry out linear extendible recovery, therefore, the embodiment of the present application is in water
Original audio-frequency information can not be needed during print detection.
Restored by linear extendible, eliminating influences brought by audio on a timeline flexible, and synchronization signal
It introduces and the starting point that can position each frame embedding information is searched in reorientation, keep forging ahead and extract watermark.
In implementation, linear extendible recovery is carried out to audio signal using following formula:
Wherein, { x " (i) }, i ∈ [0, L-1] are the audio signal after linear extendible restores；
X'(i) } it is every section audio signal；L' is signal segment length；
For the linear extendible factor；
Indicate bracket function.
The embodiment of the present application can carry out signal subsection according to synchronizing information, it is assumed that the signal received some be segmented into
X'(i) }, length also becomes length L' from original L=(N+2) × M, as L' ≠ L, above-mentioned formula can be used and carry out line
Property it is flexible restore, be equivalent to the process of an interpolation.
In implementation, the described pair of watermark sequence extracted is carried out despreading processing and be obtained using the watermark spreading sequence prestored
To watermark information, comprising:
To the watermark sequence { m extractedi* it } carries out despreading processing, the audio signal is obtained according to the key prestored
Watermark spreading sequence；
The watermark sequence is segmented, and by every section respectively with two watermark spreading sequences one by one compared in sequence
Element counts the number a and b of identical element；
If a > b is determined as 1；If a≤b is determined as 0；Finally obtain whole values of watermark information.
When it is implemented, the data containing audio frequency watermark can be carried out same by the segmented mode of insertion audio sample
Segmentation, and carry out MCLT, obtain transformation coefficient, remove two sections that head and the tail length is M, remaining effect sequence to be extracted
{Xi* }, watermark sequence is then extracted, to { mi* it } carries out despreading processing, according to key, obtain and expansion identical in embedded mobile GIS
Frequency sequence, by { mi* } carry out length be M segmentation, each section got respectively with two frequency expansion sequences one by one compared with they
Element, and identical number a and b is counted, 1 is determined as if a > b, 0 is determined as if a≤b.
In implementation, the watermark sequence { mi* } are as follows:
Wherein, { XiIt * } is sequence to be extracted；D is the intensity factor of watermark.
When it is implemented, watermark sequence { mi* }, length can be N × M.
In implementation, further comprise:
Forward error correction RS decoding is carried out to the watermark information.
Since watermark information carries out RS coding and 2 times of redundancy processing in insertion, the information bit extracted can be by letter
Breath frame structure is decomposed, and carries out RS decoding, obtains correct watermark information, while having one to the confidence level of the watermark of extraction
Fixed data are supported.
According to the rule that built-in end is embedded in particular sub-band, individually certain subbands can be handled in test side, than
The highest subband of preceding 10 coherent detection peak values is such as taken to be considered as effective information, other sub-band informations abandon, to 10 optimal detections
Correlation carries out comprehensive judgement.Sufficient data are provided for credible measurement to support.
For the obtained watermark data of decoding, in order to confirm the higher watermark information of confidence level, while abandon confidence level compared with
Low watermark information.
Confidence evaluation method is devised based on redundant embedding, it is assumed that watermark information is in transmission process not by any
Interference, then the watermark decoded from two groups of watermarks should symbol having the same, i.e., decoded using two frequency expansion sequences
And rearrange restore after obtained watermark data should be identical.With being continuously increased for interference, in two groups of watermark datas
All identical digits do not start to increase, therefore in two groups of watermark datas not all identical digits with anti-to a certain extent
Mirror the disturbed situation of watermark signal.In addition, synchronous code also provides on certain procedures due to having carried out four times of redundancy
It is disturbed the feedback of degree, can be used as a reference of confidence level.
Embodiment 3
Based on the same inventive concept, the embodiment of the present application provides a kind of television program interaction method, is illustrated below.
Fig. 7 shows the flow diagram that television program interaction method is implemented in the embodiment of the present application, as shown, described
Method includes:
Audio signal under step 701, reception TV program watching environment；The audio signal includes utilizing embodiment 1
The watermark information of the method insertion；
Step 702 extracts the watermark information using method as described in example 2 from the audio；
The watermark information is sent to server and receives what server was returned according to the watermark information by step 703
Interactive information.
Watermark information can be embedded into sound by audio frequency watermark embedding grammar described in embodiment 1 by the embodiment of the present application
In frequency signal, after user receives audio signal, audio as described in example 2 can be passed through using equipment such as mobile terminals
Watermark extracting method extracts watermark information from the audio signal, to obtain interaction letter to server using watermark information
Breath, and then interacted with other terminals.
The watermark used in the television program interaction method as provided by the embodiment of the present application is sufficiently sharp for spread-spectrum watermark
With the irrelevance between different frequency expansion sequences, interfering with each other between each watermarking components in each remixed audio is reduced,
The decoded accuracy of watermark is substantially increased, the robustness of audio signal is high, and the audio after capable of guaranteeing insertion watermark has good
Good quality, while making audio signal more abundant, reduce distortion.
In implementation, the watermark information is program id information.
When it is implemented, can be embedded in using method described in embodiment 1 when producing TV shows file or audio
Program id information, then terminal therefrom extracts program id information after receiving audio signal, and sends interaction to server and ask
It asks, the program id information can be carried in interaction request, server is the interaction content that can return to the program.
Fig. 8 shows the schematic diagram of a scenario for carrying out television program interaction in the embodiment of the present application using audio frequency watermark, such as schemes
It is shown,
Audio frequency watermark is embedded in broadcast TV program file or the audio signal of broadcast, that is, comprising for interaction
Program id information；
The sound under TV watching environment can be acquired by microphone, extract the watermark information hidden in audio；
The program id information submitted by mobile phone, server return to relevant interaction content.
Embodiment 4
Based on the same inventive concept, the embodiment of the present application provides a kind of audio frequency watermark flush mounting, and solution technology is asked
The principle of topic is similar with the audio frequency watermark embedding grammar, and overlaps will not be repeated.
A kind of audio frequency watermark flush mounting, comprising: memory, one or more processors, and one or more modules,
One or more of modules are stored in the memory, and are configured to be executed by one or more of processors,
One or more of modules include the instruction for executing each step in 1 the method for embodiment.
Embodiment 5
Based on the same inventive concept, the embodiment of the present application provides a kind of audio frequency watermark extraction element, and solution technology is asked
The principle of topic is similar with the audio frequency watermark extracting method, and overlaps will not be repeated.
A kind of audio frequency watermark extraction element, comprising: memory, one or more processors, and one or more modules,
One or more of modules are stored in the memory, and are configured to be executed by one or more of processors,
One or more of modules include the instruction for executing each step in 2 the method for embodiment.
Embodiment 6
Based on the same inventive concept, the embodiment of the present application provides a kind of electronic equipment, solves the principle of technical problem
Similar with the television program interaction method, overlaps will not be repeated.
A kind of electronic equipment, comprising: memory, one or more processors, and one or more modules, it is one
Or multiple modules are stored in the memory, and are configured to be executed by one or more of processors, it is one
Or multiple modules include the instruction for executing each step in 3 the method for embodiment.
Embodiment 7
The application is illustrated with a specific example below.
Fig. 9 shows the process schematic of the embodiment of the present application sound intermediate frequency watermark insertion, as shown, in TV programme sound
When frequency makes, temporal interval segmentation, energy judgement, time-frequency conversion processing etc. can be carried out using original audio signal as input
Operation, meanwhile, the embedment strength of watermark is determined based on psychoacoustic model analysis, carries out RS coding to watermark information, using same
Step code matrix determines key etc., generates watermark information, watermark information is finally embedded into the signal after time-frequency conversion, then carry out inverse
Time-frequency conversion, output carry the audio signal of watermark information.
Assuming that user watches that the TV programme, human ear hear the normal program content of TV programme, the hand of user at home
Machine can extract the watermark information in the audio signal propagated in air.
Figure 10 shows the process schematic of the embodiment of the present application sound intermediate frequency watermark extracting, as shown in the figure, it is assumed that receives
Unknown audio, the synchronization search process that can be initialized first, finds synchronous code, is then linearly stretched using synchronous code
Contracting restores, so that the processing such as reorientation is completed, and then the information extraction of execution cycle property, by the information extracted by information frame
Structure is decomposed, and carries out RS decoding, obtains watermark information.
After the mobile phone of user extracts watermark information, interaction content request can be sent to server, then receive service
The interaction content can be shared with other users after the interaction content of device feedback.
The embodiment of the present application has the advantage that
1, since spread-spectrum watermark energy ratio is lower, in the middle low-frequency range of sound, according to human auditory model, by different
Degree is embedded in watermark information, and human ear hearing will not obviously perceive the presence of watermark information；
2, the irrelevance between different spreading codes is taken full advantage of, watermark information is embedded in using random spreading code,
Interfering with each other between each watermarking components in each remixed audio is reduced, the decoded accuracy of watermark is substantially increased；
3, a kind of new frame structure is proposed, includes synchronizing information and watermark information, when solving audio frequency watermark decoding
Motor synchronizing problem, reduces calculation amount；
4, it may insure that the rate of information throughput reaches 8bps or more using the scheme of the embodiment of the present application, it is real-time to meet TV
The requirement of interaction.
It should be understood by those skilled in the art that, embodiments herein can provide as method, system or computer program
Product.Therefore, complete hardware embodiment, complete software embodiment or reality combining software and hardware aspects can be used in the application
Apply the form of example.Moreover, it wherein includes the computer of computer usable program code that the application, which can be used in one or more,
The computer program implemented in usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.) produces
The form of product.
The application is referring to method, the process of equipment (system) and computer program product according to the embodiment of the present application
Figure and/or block diagram describe.It should be understood that every one stream in flowchart and/or the block diagram can be realized by computer program instructions
The combination of process and/or box in journey and/or box and flowchart and/or the block diagram.It can provide these computer programs
Instruct the processor of general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce
A raw machine, so that being generated by the instruction that computer or the processor of other programmable data processing devices execute for real
The device for the function of being specified in present one or more flows of the flowchart and/or one or more blocks of the block diagram.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates,
Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or
The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one
The step of function of being specified in a box or multiple boxes.
Although the preferred embodiment of the application has been described, it is created once a person skilled in the art knows basic
Property concept, then additional changes and modifications may be made to these embodiments.So it includes excellent that the following claims are intended to be interpreted as
It selects embodiment and falls into all change and modification of the application range.
Obviously, those skilled in the art can carry out various modification and variations without departing from the essence of the application to the application
Mind and range.In this way, if these modifications and variations of the application belong to the range of the claim of this application and its equivalent technologies
Within, then the application is also intended to include these modifications and variations.
Claims (24)
1. a kind of audio frequency watermark embedding grammar characterized by comprising
Original audio signal is segmented and carries out time-frequency conversion；
Watermark information is utilized respectively the watermark spreading sequence prestored with synchronizing information, is embedded in after synchronous frequency expansion sequence is spread
Every section audio signal；
The audio signal that inverse time-frequency conversion obtains carrying watermark information is carried out to the signal after embedding information.
2. the method according to claim 1, wherein described be segmented original audio signal, comprising:
The original audio signal S that sampling obtains is divided for multiple audio frames；Wherein, S={ x (i), 1≤i≤L }, x (i) indicate the
The amplitude of i sampled point, L are the number of sampled point, and M is the length of every frame audio signal
The progress sub-frame processing of the multiple audio frame is obtained into multiple watermark windows, each watermark window includes the sound of preset quantity
Frequency frame.
3. according to the method described in claim 2, it is characterized in that, M value is 1024.
4. the method according to claim 1, wherein the watermark information passes through forward error correction RS before embedding
Coding.
5. the method according to claim 1, wherein it is described watermark information and synchronizing information be utilized respectively it is pre-
Watermark spreading sequence, the synchronous frequency expansion sequence deposited are embedded in front of every section audio signal after being spread, and further comprise:
Calculate the ENERGY E of every section audio signal；
ENERGY E is greater than preset energy threshold value ETAudio signal as audio signal to be embedded.
6. the method according to claim 1, wherein the watermark information and synchronizing information are in embedded audio signal
Pass through key encryption before, the key is to select to obtain from synchronizing information.
7. the method according to claim 1, wherein described be utilized respectively watermark information and synchronizing information prestores
Watermark spreading sequence, synchronous frequency expansion sequence be embedded in every section audio signal after being spread, the signal after embedding information is carried out
Inverse time-frequency conversion obtains carrying the audio signal of watermark information, comprising:
Watermark information is spread with synchronizing information using watermark spreading sequence, the synchronous frequency expansion sequence prestored, is spread
Sequence V afterwardss；
By the sequence V after spread spectrumsIt is embedded into the real part of audio signal, the time-frequency that time-frequency conversion is handled is done to audio signal and is become
The real part for changing coefficient X (k) is quantified；
Transformation coefficient after quantization is carried out obtaining after inverse time-frequency conversion carrying the audio signal { x'(n) } of watermark information,N=1,2 ..., 2M, k=1,2 ..., M,For transformation coefficient.
8. becoming the method according to the description of claim 7 is characterized in that doing the time-frequency that time-frequency conversion is handled to audio signal
Change coefficient X (k) are as follows:
Wherein,
N=1,2 ..., 2M, k=1,2 ..., M, M are transform length.
9. the method according to the description of claim 7 is characterized in that it is described to audio signal do that time-frequency conversion handles when
The real part of frequency transformation coefficient X (k) is quantified, comprising:
Wherein, { XiAnd { Xi' be respectively signal time-frequency conversion coefficient quantization before and after value,Represent the rounding to negative direction
Function, d are the intensity factors for being embedded in watermark information.
10. according to the method described in claim 9, it is characterized in that, it is described insertion watermark information intensity factor d=η ω,
Wherein, η is the frequency response factor that signal transmits subband, and ω is in conjunction with human ear mental model masking curve model to each subband
Embedment strength different weights coefficient.
11. the method according to claim 1, wherein the audio signal for carrying watermark informationAre as follows:
Wherein, w (i) is the information of insertion, rsFor random frequency expansion sequence, d is the watermark strength factor, xiFor original audio signal,
For the audio signal after embedding information.
12. a kind of audio frequency watermark extracting method characterized by comprising
The embedded location of synchronizing information is obtained according to the audio signal that the synchronization frequency expansion sequence search prestored receives；
The audio signal is segmented according to the synchronizing information and carries out time-frequency conversion and extracts watermark sequence；
The watermark sequence extracted is carried out despreading processing using the watermark spreading sequence prestored and obtains watermark information.
13. according to the method for claim 12, which is characterized in that the synchronization frequency expansion sequence that the basis prestores, which is searched for, to be received
To audio signal obtain the embedded location of synchronizing information, comprising:
The synchronous head byte of the audio signal received is extracted according to the synchronization frequency expansion sequence prestored；
The synchronization frequency expansion sequence being locally stored and the synchronous head byte are subjected to correlation processing, obtain synchronous frequency expansion sequence；
It is slided around its position using the synchronous frequency expansion sequence and extracts correlation, obtain the insertion position of synchronization signal
It sets.
14. according to the method for claim 13, which is characterized in that correlation calculates according to the following formula:
Wherein, xiFor main signal frame, rsFor pseudo-random sequence,It goes to zero,Positive and negative values by
Embedding information w (i) is determined.
15. according to the method for claim 12, which is characterized in that after obtaining the embedded location of synchronizing information, into one
Step includes:
According between two synchronizing informations audio length and watermark information be embedded in when two synchronizing informations between known original
Beginning audio length calculates contraction-expansion factor；
Linear extendible recovery is carried out to the audio signal according to the contraction-expansion factor.
16. according to the method for claim 15, which is characterized in that carry out linear extendible to audio signal using following formula
Restore:
Wherein, { x " (i) }, i ∈ [0, L-1] are the audio signal after linear extendible restores；
X'(i) } it is every section audio signal；L' is signal segment length；
For the linear extendible factor；
Indicate bracket function.
17. according to the method for claim 12, which is characterized in that the described pair of watermark sequence extracted utilizes the water prestored
Print frequency expansion sequence, which carries out despreading processing, obtains watermark information, comprising:
To the watermark sequence { m extractedi *Carry out despreading processing, the watermark of the audio signal is obtained according to the key prestored
Frequency expansion sequence；
The watermark sequence is segmented, and by every section respectively with two watermark spreading sequences one by one compared with member in sequence
Element counts the number a and b of identical element；
If a > b is determined as 1；If a≤b is determined as 0；Finally obtain whole values of watermark information.
18. according to the method for claim 17, which is characterized in that the watermark sequence { mi *Are as follows:
Wherein, { Xi *It is sequence to be extracted；D is the intensity factor of watermark.
19. according to the method for claim 12, which is characterized in that further comprise:
Forward error correction RS decoding is carried out to the watermark information.
20. a kind of television program interaction method characterized by comprising
Receive the audio signal under TV program watching environment；The audio signal includes that exploitation right benefit requires 1 to 11 any institute
State the watermark information of method insertion；
The watermark information is extracted from the audio using any method of claim 12 to 19；
The watermark information is sent to server and receives the interactive information that server is returned according to the watermark information.
21. according to the method for claim 20, which is characterized in that the watermark information is program id information.
22. a kind of audio frequency watermark flush mounting characterized by comprising memory, one or more processors and one
Or multiple modules, one or more of modules are stored in the memory, and are configured to by one or more of
Processor executes, and one or more of modules include requiring each step in 1 to 11 any the method for perform claim
Instruction.
23. a kind of audio frequency watermark extraction element characterized by comprising memory, one or more processors and one
Or multiple modules, one or more of modules are stored in the memory, and are configured to by one or more of
Processor executes, and one or more of modules include requiring each step in 12 to 19 any the methods for perform claim
Instruction.
24. a kind of electronic equipment, which is characterized in that the electronic equipment includes: memory, one or more processors；And
One or more modules, one or more of modules are stored in the memory, and be configured to by one or
Multiple processors execute, and one or more of modules include being used in perform claim requirement 20 to 21 in any the method respectively
The instruction of a step.
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