CN103152543B - The transmission method of the audio-video signal of a kind of composite video and device thereof - Google Patents
The transmission method of the audio-video signal of a kind of composite video and device thereof Download PDFInfo
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Abstract
The present invention relates to field of signal transmissions, particularly relate to transmission method and the device thereof of the audio-video signal of a kind of composite video, to solve in current video and Voice Surveillance technology, video and audio signal transmits respectively and is easily generated video signal and the nonsynchronous problem of audio signal.Embodiments provide the transmission method of the audio-video signal of a kind of composite video, including: for a line video signal, within row lock in time of this row, sampling obtains audio signal, the range value that sampling obtains audio signal carries out amplitude adjustment and amplitude-modulating modulation, obtains the modulated signal of audio signal；Partial video amplitude-modulating modulation signal in the horizontal blanking interval region of this row video signal is converted to the modulated signal of the audio signal obtained；This row video signal after conversion is sent.Avoid video and audio signal when being transmitted respectively, be easily generated receiving terminal and video signal and the nonsynchronous situation of audio signal occur, it is achieved that video and audio sync, conllinear transmission.
Description
Technical field
The present invention relates to field of signal transmissions, particularly relate to the transmission side of the audio-video signal of a kind of composite video
Method and device thereof.
Background technology
Along with developing rapidly of information technology, safety-security area start more and more to apply telecommunication network video and
Voice Surveillance technology.At present, the video audio monitoring equipment of use is mainly audio collecting device and video
Collecting device installation site relativelys close to, or in video equipment embedded audio collection function, make video signal and
Audio signal is by different transmission line individual transmission.
When video signal and audio signal are transmitted, need to arrange two transmission lines cables, i.e. video coaxial line
Cable and audio signal cable.In transmitting procedure, video signal and audio signal are not to synchronize to be transmitted,
Receiving terminal is it is possible that video signal and the nonsynchronous situation of audio signal.Due in project implementing process
In, need to arrange two transmission lines cables, construction and the inconvenience safeguarded can be caused.
Therefore, in video and Voice Surveillance technology, use the method that video and audio signal transmits respectively,
It is easily generated receiving terminal video signal and the nonsynchronous situation of audio signal, and easily causes transmission cable construction and dimension
The inconvenience protected.
Summary of the invention
The embodiment of the present invention provides transmission method and the device thereof of the audio-video signal of a kind of composite video, to solve
Determining in current video and Voice Surveillance technology, video and audio signal transmits respectively and is easily generated video signal and sound
Frequently the nonsynchronous problem of signal, and easily cause transmission cable construction and the inconvenience safeguarded.
Embodiments provide the transmission method of the audio-video signal of a kind of composite video, including:
For a line video signal, within row lock in time of this row, sampling obtains audio signal, to sampling
Range value to audio signal carries out amplitude adjustment and amplitude-modulating modulation, obtains the modulated signal of audio signal；
Be converted to the partial video amplitude-modulating modulation signal in the horizontal blanking interval region of this row video signal to obtain
The modulated signal of audio signal；This row video signal after conversion is sent.
Embodiments provide the method for reseptance of the audio-video signal of a kind of composite video, including:
Carry out the reception of a line video signal；Horizontal blanking interval region in this row video signal received
Inside parse the modulated signal of audio signal；Horizontal blanking interval region in this row video signal received
In and other times region in parse video amplitude-modulating modulation signal.
Embodiments provide the transmitting device of the audio-video signal of a kind of composite video, this device bag
Include:
Signal processing module, for for a line video signal, samples within row lock in time of this row and obtains
Audio signal, the range value that sampling obtains audio signal carries out amplitude adjustment and amplitude-modulating modulation, obtains sound
Frequently the modulated signal of signal；
Signal conversion module, for by the partial video amplitude modulation in the horizontal blanking interval region of this row video signal
Modulated signal is converted to the modulated signal of audio signal；
Sending module, for sending this row video signal after conversion.
Embodiments provide the reception device of the audio-video signal of a kind of composite video, this device bag
Include:
Receiver module, for carrying out the reception of a line video signal；
Audio signal demodulation module, in the horizontal blanking interval region in this row video signal received
Demodulate the modulated signal of audio signal；
Video signal demodulation module, in the horizontal blanking interval region in this row video signal received
With demodulate video amplitude-modulating modulation signal in other times region.
The embodiment of the present invention uses for a line video signal, is adjusted by the partial video in horizontal blanking interval region
Amplitude modulating signal is converted to the modulated signal of audio signal, and wherein the modulated signal of audio signal is at this row
The range value of the row interior audio signal obtained of sampling lock in time, and the amplitude to the audio signal that sampling obtains
Value carries out amplitude adjustment and amplitude-modulating modulation obtains.Horizontal blanking interval region includes colour synchronisation to terminate to row to be had
Effect space from start time and colour synchronisation time, owing to colour synchronisation terminates not contain to row effective space from start time
There is effective viewing area of video, therefore colour synchronisation is terminated the part signal to row effective space from start time
It is converted into audio signal, video signal will not be produced impact；The Main Function of colour synchronisation time is to pass through
Several periodic signals that the colour synchronisation time starts realize the frequency of video signal and the locking of phase place, therefore by color
The video signal in last several cycles of lock in time is converted to audio signal, also will not produce video signal
Impact.Therefore, carry out video signal and audio signal synchronizing by said method, conllinear transmits, not only
When video and audio signal can be avoided to be transmitted respectively, it is easily generated receiving terminal and video signal and audio frequency occur
The nonsynchronous problem of signal, and when video and audio signal is transmitted respectively, need to lay respectively transmission
Video signal and the cable of audio signal, easily cause transmission cable construction and the inconvenient problem safeguarded；And
The transmission quality of video signal will not be impacted.
Accompanying drawing explanation
Fig. 1 is the flow process signal of the transmission method of the audio-video signal of a kind of composite video in the embodiment of the present invention
Figure；
Fig. 2 is row retaining zone in the embodiment of the present invention, and colour synchronisation time and colour synchronisation terminate to row effectively to rise
The position view begun interval time；
Fig. 3 is that in the embodiment of the present invention, the modification of signal in the colour synchronisation time is the audio signal that sampling obtains
Schematic diagram；
Fig. 4 be in the embodiment of the present invention colour synchronisation terminate to row effective space from start time in superposition sampling obtain
The schematic diagram of audio signal；
Fig. 5 is the process signal of the transmission method of the audio-video signal of a kind of composite video in the embodiment of the present invention
Figure；
Fig. 6 is sampling and the transmission method of the audio-video signal of a kind of composite video in the embodiment of the present invention
Schematic flow sheet；
Fig. 7 is the flow process signal of the method for reseptance of the audio-video signal of a kind of composite video in the embodiment of the present invention
Figure；
Fig. 8 is that in the embodiment of the present invention, the method for reseptance of the audio-video signal of a kind of composite video includes docking
The audio signal received is filtered the schematic flow sheet processed and gain control processes；
Fig. 9 is the schematic diagram of the transmitting device of the audio-video signal of a kind of composite video in the embodiment of the present invention；
Figure 10 is the schematic diagram receiving device of the audio-video signal of a kind of composite video in the embodiment of the present invention.
Detailed description of the invention
The embodiment of the present invention uses for a line video signal, and within row lock in time of this row, sampling obtains sound
Frequently signal, the range value that sampling obtains audio signal carries out amplitude adjustment and amplitude-modulating modulation, obtains audio frequency
The modulated signal of signal；Partial video amplitude-modulating modulation in the horizontal blanking interval region of this row video signal is believed
Number be converted to the modulated signal of the audio signal obtained；This row video signal after conversion is sent, by video
Signal and audio signal carry out synchronizing, conllinear transmission, it is to avoid when video and audio signal is transmitted respectively,
It is easily generated receiving terminal and video signal and the nonsynchronous situation of audio signal occur, and easily cause transmission cable construction
With the problem safeguarding inconvenience, it is achieved that video and audio sync, conllinear transmission.
Below in conjunction with Figure of description, the embodiment of the present invention is described in further detail.
As it is shown in figure 1, under the transmission method of the audio-video signal of a kind of composite video of the embodiment of the present invention includes
Row step:
Step 101: for a line video signal, within row lock in time of this row, sampling obtains audio signal,
The range value that sampling obtains audio signal carries out amplitude adjustment and amplitude-modulating modulation, obtains the tune of audio signal
Signal processed；
Step 102: by the partial video amplitude-modulating modulation signal in the horizontal blanking interval region of this row video signal
Be converted to the modulated signal of the audio signal obtained；
Step 103: this row video signal after conversion is sent.
In step 101, it is thus achieved that the method for the modulated signal of audio signal is as follows: be first expert at the synchronous head time
In audio signal is once sampled, obtain the range value of audio signal, further according to automatic growth control
Yield value carries out amplitude adjustment to the range value of audio signal, makes the audio signal width that automatic growth control processes
The peak-to-peak value of angle value more than the peak-to-peak value of video amplitude value, and can not use the carrier wave of chrominance carrier to believe
Number to automatic growth control process after audio signal carry out amplitude-modulating modulation process, just obtain audio signal
Modulated signal, its range value is exactly the amplitude modulation value of the modulated signal of audio signal.
Wherein, the peak-to-peak value of the audio frequency signal amplitude value that automatic growth control processes can not be more than video signal width
The peak-to-peak value of angle value.It is preferred that the maximum peak peak value of video signal is 1V, then through automatic growth control
The peak-to-peak value of the audio signal processed cannot be more than 1V.
In step 102, row scanning flyback region includes: colour synchronisation time and colour synchronisation terminate to row effectively to rise
Begin interval time.
As in figure 2 it is shown, be row retaining zone in the embodiment of the present invention, colour synchronisation time and colour synchronisation terminate to
Row position in a line video signal of effective space from start time, wherein row retaining zone is in the colour synchronisation time
Before, colour synchronisation terminated to row effective space from start time after the colour synchronisation time.
Regard below for part colour synchronisation time or colour synchronisation terminated to row effective space from start time
Frequency modulation amplitude modulating signal is converted to the method for the modulated signal of audio signal, is introduced respectively.
One, the partial video amplitude-modulating modulation signal in the colour synchronisation time in row scanning flyback region is converted to
The modulated signal of audio signal:
It is expert in the synchronous head time and audio signal is once sampled, obtain the range value of audio signal, then
Yield value according to automatic growth control carries out amplitude adjustment to the range value of audio signal, makes automatic gain control
The peak-to-peak value of the audio frequency signal amplitude value that system processes more than the peak-to-peak value of video amplitude value, and can not use
Audio signal after automatic growth control is processed by the carrier signal of chrominance carrier carries out amplitude-modulating modulation process,
Obtaining the modulated signal of audio signal, its range value is exactly the amplitude modulation value of the modulated signal of audio signal.
For a line video signal, by the video of last N number of chrominance carrier clock cycle of colour synchronisation time
The range value of amplitude-modulating modulation signal, is revised as the modulation letter of the audio signal obtained within this every trade lock in time
Number amplitude modulation value, N is positive integer.Wherein, the phase place of chrominance subcarrier signal with in this every trade lock in time
The phase place of the audio modulation signal obtained is continuous print.
It is preferred that the video amplitude-modulating modulation of last N number of chrominance carrier clock cycle of colour synchronisation time is believed
Number range value, be all revised as the amplitude modulation of the modulated signal of the audio signal obtained within this every trade lock in time
Value；After reception equipment receives containing the video signal of the demodulated signal of audio signal, it is demodulated, will be
The amplitude modulation value of the modulated signal of the audio signal of rear N number of chrominance carrier clock cycle is averaged, accurately
Reduction audio signal.Wherein, the determination of N value, and the position of the modulated signal of audio signal is that signal is sent out
Sending end and signal receiving end carry out arranging in advance.
Wherein, after N value determines, signal sending end is by last N number of chrominance carrier clock of colour synchronisation time
The range value of the video amplitude-modulating modulation signal in cycle, is revised as the audio frequency letter obtained within this every trade lock in time
Number the amplitude modulation value of modulated signal；Signal receiving end, according to row synchronous head signal and colour synchronisation head signal, obtains
It is carried in the modulated signal of the audio signal of last N number of chrominance carrier clock cycle of colour synchronisation time
Amplitude modulation value.
It is preferred that due to the range value by the video amplitude-modulating modulation signal of 1 chrominance carrier clock cycle,
It is revised as the amplitude modulation value of the modulated signal of the audio signal obtained within this every trade lock in time, may exist
Receiving terminal sampling is inaccurate, the deviation of sampled value occurs；By regarding of chrominance carrier clock cycle too much for quantity
The range value of frequency modulation amplitude modulating signal, is revised as the modulation of the audio signal obtained within this every trade lock in time
The amplitude modulation value of signal, can affect the time span requirement of the carrier chrominance signal locking of video, therefore, by colour synchronisation
The range value of the video amplitude-modulating modulation signal of last 2 ~ 5 chrominance carrier clock cycle of time, is revised as
The amplitude modulation value of the modulated signal of the audio signal obtained within this every trade lock in time.
As it is shown on figure 3, in the embodiment of the present invention, for a line video signal, by last in the colour synchronisation time
The video amplitude-modulating modulation modification of signal of two chrominance carrier clock cycle is for obtaining within this every trade lock in time
The schematic diagram of the modulated signal of the audio signal obtained, wherein has the video of multiple clock cycle in the colour synchronisation time
Amplitude-modulating modulation signal, adjusts the video amplitude modulation of latter two chrominance carrier clock cycle in the colour synchronisation time
The range value of signal processed, is revised as the modulated signal amplitude modulation of this every trade interior audio signal obtained lock in time
Value, Va is the amplitude modulation value of the modulated signal of this every trade interior audio signal obtained lock in time, and the value of Va is not
Can be more than the peak-to-peak value of this row video signal.
Two, the colour synchronisation in row scanning flyback region is terminated the part to row effective space from start time or complete
The modulated signal of audio signal is converted in portion's unidirectional current level values:
It is expert in the synchronous head time and audio signal is once sampled, obtain the range value of audio signal,
Yield value according to automatic growth control carries out amplitude adjustment to the range value of audio signal, makes automatic gain control
The peak-to-peak value of the audio frequency signal amplitude value that system processes more than the peak-to-peak value of video amplitude value, and can not use
Audio signal after automatic growth control is processed by the carrier signal of chrominance carrier carries out amplitude-modulating modulation process,
Obtaining the modulated signal of audio signal, its range value is exactly the amplitude modulation of the modulated signal of the audio signal obtained
Value.
Terminate to fold continuously to the part or all of unidirectional current level values of row effective space from start time in colour synchronisation
Adding the modulated signal of the audio signal of M chrominance carrier clock cycle, M is positive integer；Wherein, color
With EOS to the effective space from start time chrominance subcarrier signal of row phase place with in this every trade lock in time
The phase place of the modulated signal of the audio signal that sampling obtains is continuous print.
It is preferred that the amplitude modulation value of the modulated signal by the audio signal of M chrominance carrier clock cycle,
Being superimposed upon continuously in the unidirectional current level values in horizontal blanking district, reception equipment receives the demodulation letter containing audio signal
Number video signal demodulation after, by the audio frequency of M continuous print chrominance carrier clock cycle of fixed position
The amplitude modulation value of the modulated signal of signal is averaged, and reduces audio signal accurately.Wherein, the determination of M value
It is that signal sending end is arranged in advance with signal receiving end, and superposition in the unidirectional current level values of blanking zone of being expert at
The position of the modulated signal of audio signal, is also that signal sending end carries out arranging with signal receiving end in advance.
After M value determines, signal sending end is by the tune of the audio signal in the frequency cycle of M chrominance carrier
The range value of signal processed, is superimposed upon in the unidirectional current level values of blanking zone；Signal receiving end is believed according to row synchronous head
Number and colour synchronisation head signal, obtain be carried in colour synchronisation terminate to row effective space from start time unidirectional current level values
On M chrominance carrier the frequency cycle in the modulated signal of audio signal.
It is preferred that due to by the amplitude modulation value of the modulated signal of the audio signal of a chrominance carrier clock cycle
It is superimposed upon in the unidirectional current level values of blanking zone, receiving terminal sampling may be there is inaccurate, the inclined of sampled value occurs
Difference；By the amplitude modulation value of the modulated signal of the audio signal of chrominance carrier clock cycle too much for quantity, continuously
It is superimposed upon in the unidirectional current level values of blanking zone, the time span requirement of the carrier chrominance signal locking of video can be affected,
Therefore, 2 ~ 5 colors of superposition continuously are terminated to the unidirectional current level values of row effective space from start time in colour synchronisation
The modulated signal of the audio signal of degree subcarrier clock cycle is preferable.
As shown in Figure 4, in the embodiment of the present invention, for a line video signal, terminate to row in colour synchronisation
The effectively audio frequency of continuous two chrominance carrier clock cycle of superposition in the unidirectional current level values of space from start time
The schematic diagram of the modulated signal of signal, wherein colour synchronisation terminated to row effective space from start time is unidirectional current
Level values, by the amplitude modulation value of the modulated signal of the audio signal of two chrominance carrier clock cycle, continuous superposition
Terminate to the fixed position of the unidirectional current level values of row effective space from start time in colour synchronisation, concrete grammar
For, by the amplitude modulation value of the modulated signal of the audio signal of a chrominance carrier clock cycle, it is superimposed upon color same
After on the fixed position of the EOS extremely unidirectional current level values of row effective space from start time, in this audio signal
Modulated signal range value after, the modulation of the audio signal of second chrominance carrier clock cycle of superposition
The amplitude modulation value of signal, Vb is the amplitude modulation value of the modulated signal of this every trade interior audio signal obtained lock in time,
The value of Vb can not be more than the peak-to-peak value of this row video signal.
As it is shown in figure 5, be the transmission method of the audio-video signal of a kind of composite video in the embodiment of the present invention
Process schematic.First it is expert in the synchronous head time and audio signal is once sampled, obtain audio signal
Range value, the yield value further according to automatic growth control carries out amplitude adjustment to the range value of audio signal,
And the audio signal after using the carrier signal of chrominance carrier to process automatization's gain control carries out amplitude modulation
Modulation treatment, it is thus achieved that the modulated signal of audio signal；Partial video amplitude modulation in horizontal blanking interval region is adjusted
Signal processed is changed into the modulated signal of the audio signal obtained, and finally will contain the modulation of audio signal in a line
The video signal of signal sends to receiving equipment.
Shown in Fig. 6, the sampling of the audio-video signal of a kind of composite video and transmission side in the embodiment of the present invention
Method comprises the following steps:
Step 601: in the synchronous head time of being expert at, audio signal is once sampled, obtain audio signal
Range value；
Step 602: the range value of audio signal is carried out amplitude adjustment according to the yield value of automatic growth control；
Step 603: the audio signal after using the carrier signal of chrominance carrier that automatic growth control is processed
Carry out amplitude-modulating modulation process, obtain the modulated signal of audio signal；
Step 604: by last 3 chrominance carrier clock cycle of colour synchronisation time in this row video signal
The range value of video amplitude-modulating modulation signal, the audio signal being revised as obtaining within this every trade lock in time
The amplitude modulation value of modulated signal；
Step 605: this row video signal after conversion is sent.
Wherein, in step 602, according to the yield value of automatic growth control, the range value of audio signal is carried out
Amplitude adjusts, and the peak-to-peak value of audio signal can not be more than the peak-to-peak value of video signal.
In step 604, can be by this row video signal during last N number of chrominance carrier of colour synchronisation time
The range value of the video amplitude-modulating modulation signal in the clock cycle, is revised as the sound obtained within this every trade lock in time
Frequently the amplitude modulation value of the modulated signal of signal, N is positive integer.
In step 604, this row video signal is processed, it is also possible to include the letter of not color burst time
Number processing, color burst terminates to the signal of row effective space from start time to carry out situation about processing, tool
Body method sees step 101.
As it is shown in fig. 7, be the method for reseptance of the audio-video signal of a kind of composite video in the embodiment of the present invention,
Including:
Step 701: carry out the reception of a line video signal；
Step 702: demodulate audio frequency letter in the horizontal blanking interval region in this row video signal received
Number modulated signal；
Step 703: in the horizontal blanking interval region in this row video signal received and other times district
Video amplitude-modulating modulation signal is demodulated in territory.
Wherein, in step 701, in a line video signal received, the part in horizontal blanking interval region regards
Frequency modulation amplitude modulating signal is converted to the modulated signal of the row interior audio signal obtained lock in time of this row.
It is preferred that in step 702, according to row synchronous head and colour synchronisation head signal, obtain the tune of audio signal
Signal processed；The wherein loading position of the modulated signal of audio signal, loading cycle is to carry out with signal sending end
Make an appointment.
In step 702, use video demodulator, according to row synchronous head and colour synchronisation head signal, to receive
A line video signal is demodulated, when solution is transferred to the modulation letter of the audio signal made an appointment with signal sending end
Number loading position time, the amplitude modulation value of the modulated signal of audio signal is read out, obtains the low frequency of this row
The audio signal of rate；The audio frequency signal amplitude in every row video signal is read out according to row time interval, must
To continuous print audio signal, continuous print audio signal is exactly the audio signal that transmitting terminal sends.
It is preferred that step 702 can also include: the low-frequency audio signal obtained is passed through 0-
(10kHz-20kHz) low pass filter carries out smooth sampling, filters the noise of high frequency, obtains high-quality
Audio signal.
The peak-to-peak value of range value of the amplitude-modulated signal of the audio signal sent due to transmitting terminal can not be more than video
The peak-to-peak value of signal amplitude value, the range value of the amplitude-modulated signal of the audio signal that receiving terminal receives also would not
More than the peak-to-peak value of video signal, after audio signal is filtered by low pass filter, its signal amplitude value will not
Change, and hence it is also possible to according to different scenes or the demand of different user, the audio frequency that filtering is obtained
Signal carries out gain process, amplifies or deamplification amplitude, and finally exports audio signal.
As shown in Figure 8, in the embodiment of the present invention, the method for reseptance of the audio-video signal of a kind of composite video
Include the schematic diagram that the audio signal received is filtered to be processed and gain control processes.
Step 801: receive the video signal of the modulated signal that a line contains audio signal；
Step 802: according to row synchronous head and colour synchronisation head signal, video signal and audio signal are solved
Adjust, obtain low-frequency audio signal；
Step 803: the low-frequency audio signal obtained is put down by the low pass filter of 0-10kHz
Sliding sampling, and filter high-frequency noise；
Step 804: the audio signal obtaining filtering carries out gain process, amplifies signal amplitude；
Step 805: output audio signal.
Wherein, the method for reseptance of the audio-video signal of composite video can only include the audio frequency letter received
Number carry out smooth sampling, and filter the process of high-frequency noise, or only include the audio signal received is carried out
Gain control processes.
In step 803, the frequency range of low pass filter is 0-(10kHz-20kHz).
In step 804, the audio signal obtaining filtering carries out gain process, the different or user according to scene
Demand different, can amplify or deamplification amplitude.
Based on same inventive concept, the embodiment of the present invention additionally provides the audio-video signal of a kind of composite video
Transmitting device, owing to this device solves the audio frequency and video letter of principle and the embodiment of the present invention composite video of problem
Number transmission method similar, therefore the enforcement of this device may refer to the enforcement of method, the most superfluous in place of repetition
State.
As it is shown in figure 9, be the transmitting device of the audio-video signal of a kind of composite video in the embodiment of the present invention,
Including:
Signal processing module 901, for for a line video signal, sampled within row lock in time of this row
Obtaining audio signal, the range value that sampling obtains audio signal carries out amplitude adjustment and amplitude-modulating modulation,
Modulated signal to audio signal；
Signal conversion module 902, for by the partial video in the horizontal blanking interval region of this row video signal
Amplitude-modulating modulation signal is converted to the modulated signal of audio signal；
Sending module 903, this row video signal after just conversion sends.
Signal processing module 901 specifically for, be expert in the synchronous head time and audio signal once sampled,
Obtain the range value of audio signal, at the yield value according to automatic growth control, the range value of audio signal is entered
Line amplitude adjusts, and the peak-to-peak value making the audio frequency signal amplitude value that automatic growth control processes can not be more than video letter
The peak-to-peak value of number range value, and the sound after using the carrier signal of chrominance carrier that automatic growth control is processed
Frequently signal carries out amplitude-modulating modulation process, it is thus achieved that audio modulation signal, and its range value is exactly audio modulation signal
Amplitude modulation value.
Wherein, the peak-to-peak value of the audio frequency signal amplitude value that automatic growth control processes can not be more than video signal width
The peak-to-peak value of angle value.It is preferred that the maximum peak peak value of video signal is that 1V is then at automatic growth control
The peak-to-peak value of the audio signal of reason cannot be more than 1V.
In signal conversion module 902, row scanning flyback region includes, colour synchronisation time and colour synchronisation terminate to row
The effectively space from start time.
One, by the colour synchronisation district partial video amplitude-modulating modulation in row scanning flyback region in signal conversion module 902
Signal is converted to the modulated signal of audio signal:
For a line video signal, by the video of last N number of chrominance carrier clock cycle of colour synchronisation time
The range value of amplitude-modulating modulation signal, is revised as the modulation letter of the audio signal obtained within this every trade lock in time
Number amplitude modulation value, N is positive integer.Wherein, the phase place of chrominance subcarrier signal with in this every trade lock in time
The phase place of the audio signal that sampling obtains is continuous print.
It is preferred that by last N number of chrominance carrier clock cycle video amplitude-modulating modulation signal of colour synchronisation time
Range value, be all revised as the amplitude modulation of the modulated signal of the audio signal obtained within this every trade lock in time
Value；Reception equipment receives the video signal of the modulated signal containing audio signal, after being demodulated processing,
The amplitude modulation value of the modulated signal of the audio signal of last N number of chrominance carrier clock cycle is averaged, accurate
True reduction audio signal.Wherein, the determination of N value, and the position of the modulated signal of audio signal is letter
Number transmitting terminal is arranged in advance with signal receiving end.
It is preferred that due to by the video amplitude-modulating modulation carrier-signal amplitude value of 1 chrominance carrier clock cycle,
It is revised as the modulated signal amplitude modulation value of the audio signal obtained within this every trade lock in time, may exist and connect
Receiving end sampling is inaccurate, the deviation of sampled value occurs；Video by the chrominance carrier clock cycle too much for quantity
Amplitude-modulating modulation signal amplitude value, is revised as the modulated signal of the audio signal obtained within this every trade lock in time
Amplitude modulation value, can affect video carrier chrominance signal locking time span requirement, therefore, by the colour synchronisation time
The range value of video amplitude-modulating modulation signal of last 2 ~ 5 chrominance carrier clock cycle, be revised as at this
The amplitude modulation value of the modulated signal of the audio signal that every trade obtained in lock in time.
Two, the colour synchronisation in the row scanning flyback region in signal conversion module 902 is terminated to row the most initial
In part colourity load interval time or all unidirectional current level values, superposition is converted to believe into the modulation of audio signal
Number:
For a line video signal, terminate to going the most straight of effective space from start time in colour synchronisation
The amplitude-modulating modulation of the audio signal of M the chrominance carrier clock cycle that continuous superposition obtains on stream level value
Signal, M is positive integer；Wherein, colour synchronisation terminates to the effective space from start time chrominance subcarrier signal of row
Phase place of audio modulation signal of obtaining with sampling in this every trade lock in time of phase place be continuous print.
It is preferred that the audio frequency that will obtain in row lock in time of this row of M chrominance carrier clock cycle
The amplitude modulation value of the modulated signal of signal, is superimposed upon in the unidirectional current level values in horizontal blanking district continuously, in order to receive
Equipment receives the video signal of the modulated signal containing audio signal, after being demodulated processing, by fixed bit
The amplitude modulation value of the modulated signal of the audio signal of M the continuous print chrominance carrier clock cycle put is averaged
Value, reduces audio signal accurately.Wherein, the determination of M value is signal sending end with signal receiving end in advance
Arrange, and the position of the modulated signal of superposition audio signal in the unidirectional current level values of blanking zone of being expert at, also
It is that signal sending end carries out arranging with signal receiving end in advance.
It is preferred that due to the sound that will obtain in row lock in time of this row of a chrominance carrier clock cycle
Frequently the amplitude modulation value of the modulated signal of signal, is superimposed upon in the unidirectional current level values in horizontal blanking district, may exist and connect
Receiving end sampling is inaccurate, the deviation of sampled value occurs；This row by the chrominance carrier clock cycle too much for quantity
Row lock in time in the amplitude modulation value of the modulated signal of audio signal that obtains, be superimposed upon the straight of blanking zone continuously
On stream level value, the time span requirement of the carrier chrominance signal locking of video can be affected, therefore, tie in colour synchronisation
Continuous 2 ~ 5 chrominance carrier clock cycle of superposition in the unidirectional current level values of Shu Zhihang effective space from start time
This every trade lock in time in the modulated signal of audio signal that obtains preferable.
As shown in Figure 10, for the reception device of the audio-video signal of composite video a kind of in the embodiment of the present invention,
Including:
Receiver module 1001, for carrying out the reception of a line video signal；
Audio signal demodulation module 1002, for the horizontal blanking interval district in this row video signal received
The modulated signal of audio signal is demodulated in territory；
Video signal demodulation module 1003, for the horizontal blanking interval district in this row video signal received
In territory and demodulate video amplitude-modulating modulation signal in other times region.
It is preferred that receiver module 1001 specifically for, the signal received is a line video signal.Video
Signal is to be changed into by the partial video amplitude-modulating modulation signal in horizontal blanking interval region in a line video signal
The modulated signal of audio signal.
Audio signal demodulation module 1002 specifically for, according to row synchronous head and colour synchronisation head signal, docking
A line video signal received is demodulated, when solution is transferred to the tune of the audio signal made an appointment with signal sending end
During the loading position of signal processed, the amplitude modulation value of the modulated signal of audio signal is read out, obtains this row
Low-frequency audio signal；The audio frequency signal amplitude of often row audio-video signal is read out according to row time interval,
Obtaining continuous print audio signal, continuous print audio signal is exactly the audio signal that transmitting terminal sends.
It is preferred that the reception device of the audio-video signal of this composite video can also include filtration module and gain
Control module.
Filtration module is used for, and the low frequency audio signal that demodulation module obtains is passed through 0-(10kHz-20kHz)
Low pass filter carry out smooth sampling, filter the noise of high frequency, obtain the audio signal of high-quality.
Gain control module is used for, according to different scenes or the demand of different user, audio frequency filtering obtained
Signal carries out gain process, amplifies or deamplification amplitude, and finally exports audio signal.
Those skilled in the art are it should be appreciated that embodiments of the invention can be provided as method, system or meter
Calculation machine program product.Therefore, the present invention can use complete hardware embodiment, complete software implementation or knot
The form of the embodiment in terms of conjunction software and hardware.And, the present invention can use and wherein wrap one or more
Computer-usable storage medium containing computer usable program code (include but not limited to disk memory,
CD-ROM, optical memory etc.) form of the upper computer program implemented.
The present invention is with reference to method, equipment (system) and computer program product according to embodiments of the present invention
The flow chart of product and/or block diagram describe.It should be understood that can by computer program instructions flowchart and
/ or block diagram in each flow process and/or flow process in square frame and flow chart and/or block diagram and/
Or the combination of square frame.These computer program instructions can be provided to general purpose computer, special-purpose computer, embedding
The processor of formula datatron or other programmable data processing device is to produce a machine so that by calculating
The instruction that the processor of machine or other programmable data processing device performs produces for realizing at flow chart one
The device of the function specified in individual flow process or multiple flow process and/or one square frame of block diagram or multiple square frame.
These computer program instructions may be alternatively stored in and computer or the process of other programmable datas can be guided to set
In the standby computer-readable memory worked in a specific way so that be stored in this computer-readable memory
Instruction produce and include the manufacture of command device, this command device realizes in one flow process or multiple of flow chart
The function specified in flow process and/or one square frame of block diagram or multiple square frame.
These computer program instructions also can be loaded in computer or other programmable data processing device, makes
Sequence of operations step must be performed to produce computer implemented place on computer or other programmable devices
Reason, thus the instruction performed on computer or other programmable devices provides for realizing flow chart one
The step of the function specified in flow process or multiple flow process and/or one square frame of block diagram or multiple square frame.
Although preferred embodiments of the present invention have been described, but those skilled in the art once know base
This creativeness concept, then can make other change and amendment to these embodiments.So, appended right is wanted
Ask and be intended to be construed to include preferred embodiment and fall into all changes and the amendment of the scope of the invention.
Obviously, those skilled in the art can carry out various change and modification without deviating from this to the present invention
Bright spirit and scope.So, if the present invention these amendment and modification belong to the claims in the present invention and
Within the scope of its equivalent technologies, then the present invention is also intended to comprise these change and modification.
Claims (8)
1. the transmission method of the audio-video signal of a composite video, it is characterised in that the method includes:
For a line video signal, within row lock in time of this row, sampling obtains audio signal, to sampling
Range value to audio signal carries out amplitude adjustment and amplitude-modulating modulation, obtains the modulated signal of audio signal；
Partial video amplitude-modulating modulation signal in the horizontal blanking interval region of this row video signal is converted to sound
Frequently the modulated signal of signal；
This row video signal after conversion is sent；
Described horizontal blanking interval region includes the colour synchronisation time；
The audio signal being converted to the partial video amplitude-modulating modulation signal in horizontal blanking interval region to obtain
Modulated signal, including:
The video amplitude-modulating modulation signal of last N number of chrominance carrier clock cycle of colour synchronisation time is changed
The modulated signal of the audio signal for obtaining, wherein N is positive integer.
2. the method for claim 1, it is characterised in that sample within row lock in time of this row
Obtaining audio signal, the range value that sampling obtains audio signal carries out amplitude adjustment and amplitude-modulating modulation,
To the modulated signal of audio signal, including:
Within row lock in time of this row video signal, audio signal is sampled, obtain the width of audio signal
Angle value, carries out amplitude adjustment according to the yield value of automatic growth control to the range value of audio signal, and uses
Audio signal after amplitude is adjusted by chrominance subcarrier signal carries out amplitude-modulating modulation, obtains the modulation of audio signal
Signal.
3. method as claimed in claim 2, it is characterised in that according to the yield value of automatic growth control
The peak-to-peak value of the audio signal after the range value of audio signal is carried out amplitude adjustment is not more than video signal
Peak-to-peak value.
4. the method for reseptance of the audio-video signal of a composite video, it is characterised in that the method includes:
Carry out the reception of a line video signal；
The modulation of audio signal is parsed in horizontal blanking interval region in this row video signal received
Signal；Wherein, in horizontal blanking interval region includes colour synchronisation time, and described horizontal blanking interval region
The modulated signal of audio signal is that the video of last N number of chrominance carrier clock cycle of colour synchronisation time is adjusted
Amplitude modulating signal is converted to；
Resolve in horizontal blanking interval region in this row video signal received and other times region
Go out video amplitude-modulating modulation signal.
5. the transmitting device of the audio-video signal of a composite video, it is characterised in that this device includes:
Signal processing module, for for a line video signal, samples within row lock in time of this row and obtains
Audio signal, the range value that sampling obtains audio signal carries out amplitude adjustment and amplitude-modulating modulation, obtains sound
Frequently the modulated signal of signal；
Signal conversion module, for by the partial video amplitude modulation in the horizontal blanking interval region of this row video signal
Modulation signal transitions is the modulated signal of the audio signal obtained；
Sending module, this row video signal after just conversion sends；
Described signal conversion module is used for:
Horizontal blanking interval region includes the colour synchronisation time, during by last N number of chrominance carrier of colour synchronisation time
The video amplitude-modulating modulation signal in clock cycle is converted to the modulated signal of the audio signal obtained, and wherein, N is just
Integer.
6. device as claimed in claim 5, it is characterised in that signal processing module specifically for:
Within row lock in time of this row video signal, audio signal is sampled, obtain the width of audio signal
Angle value, carries out amplitude adjustment according to the yield value of automatic growth control to the range value of audio signal, and uses
Audio signal after amplitude is adjusted by chrominance subcarrier signal carries out amplitude-modulating modulation, obtains the modulation of audio signal
Signal.
7. device as claimed in claim 6, it is characterised in that according to automatically increasing in described sampling module
The yield value that benefit controls carries out the peak-to-peak value of the audio signal after amplitude adjustment not to the range value of audio signal
Peak-to-peak value more than video signal.
8. the reception device of the audio-video signal of a composite video, it is characterised in that this device includes:
Receiver module, for carrying out the reception of a line video signal；
Audio signal demodulation module, in the horizontal blanking interval region in this row video signal received
Demodulate the modulated signal of audio signal；Wherein, horizontal blanking interval region includes colour synchronisation time, and institute
The last N number of colourity that modulated signal is the colour synchronisation time stating the audio signal in horizontal blanking interval region is secondary
The video amplitude-modulating modulation signal in carrier clock cycle is converted to；
Video signal demodulation module, in the horizontal blanking interval region in this row video signal received
With demodulate video amplitude-modulating modulation signal in other times region.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210438458.6A CN103152543B (en) | 2012-11-06 | 2012-11-06 | The transmission method of the audio-video signal of a kind of composite video and device thereof |
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| CN201210438458.6A CN103152543B (en) | 2012-11-06 | 2012-11-06 | The transmission method of the audio-video signal of a kind of composite video and device thereof |
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| CN103152543B true CN103152543B (en) | 2016-08-24 |
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| CN106209322B (en) * | 2016-07-18 | 2019-12-20 | 浙江大华技术股份有限公司 | Method and device for hybrid data transmission in video signal |
| CN107888567B (en) | 2017-10-23 | 2020-08-04 | 浙江大华技术股份有限公司 | Method and device for transmitting composite multimedia signal |
| CN114584717B (en) * | 2022-05-06 | 2022-09-23 | 杭州雄迈集成电路技术股份有限公司 | Audio interaction method and device |
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| US5060262A (en) * | 1990-05-07 | 1991-10-22 | Bevins Jr George L | Video scrambling, audio masking and data transmission methods for wireless cable systems |
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| US4295155A (en) * | 1979-06-08 | 1981-10-13 | International Telephone And Telegraph Corporation | Gray scale sync video processing system |
| US4353088A (en) * | 1980-05-14 | 1982-10-05 | Oak Industries, Inc. | Coding and decoding system for video and audio signals |
| US4479150A (en) * | 1980-11-08 | 1984-10-23 | Basf Aktiengesellschaft | Methods and arrangements for changing the audio information in an audio/video recording/reproduction system |
| CN85103060A (en) * | 1985-04-23 | 1986-10-22 | 天津大学 | Television multiplex vocoder |
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