CN106506904B - A kind of method for transmitting signals and equipment - Google Patents
A kind of method for transmitting signals and equipment Download PDFInfo
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- CN106506904B CN106506904B CN201611007249.0A CN201611007249A CN106506904B CN 106506904 B CN106506904 B CN 106506904B CN 201611007249 A CN201611007249 A CN 201611007249A CN 106506904 B CN106506904 B CN 106506904B
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- transmission channel
- signal
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- vision signal
- transmission
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/14—Picture signal circuitry for video frequency region
- H04N5/21—Circuitry for suppressing or minimising disturbance, e.g. moiré or halo
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N17/00—Diagnosis, testing or measuring for television systems or their details
- H04N17/04—Diagnosis, testing or measuring for television systems or their details for receivers
Abstract
The invention discloses a kind of method for transmitting signals and equipment, will lead to noise signal amplification while to solve the problem of that existing video signal transmission promotes signal-to-noise ratio in the process and system power dissipation is caused to waste.Method are as follows: transmitting terminal receives the preemphasis filter coefficient that receiving end is sent, wherein, the preemphasis filter coefficient is that the receiving end determines after determination needs to carry out the vision signal of transmission channel current transmission preemphasis processing according to the frequency domain characteristic of the transmission channel；The transmitting terminal configures preemphasis filter using the preemphasis filter coefficient, and handles using with the preemphasis filter postponed the vision signal of the transmission channel current transmission；Treated vision signal by the transmission channel is sent to receiving end by the transmitting terminal.
Description
Technical field
The present invention relates to signal processing technology field more particularly to a kind of method for transmitting signals and equipment.
Background technique
Vision signal, especially analog video signal, it is serious decaying after long distance transmission, influence vision signal
Restore.In order to guarantee the transmission quality of vision signal, need that anti-interference mechanism is added in a transmission path.But vision signal
Transmission channel type is more, only relies on the variation that anti-interference mechanism is not able to satisfy transmission condition, if fixed for specific channel
The adaptable anti-interference mechanism of system, it will cause design cost high, popularization is poor.
The currently used mode for promoting signal-to-noise ratio are as follows: transmitting terminal is before sending vision signal using amplifier to the view
Frequency signal such as amplifies at the processing, wherein amplifier generallys use Simulation scale-up device or Simulation scale-up circuit is realized.Due to mould
Quasi- amplifying device will cause cross modulation and intermodulation, and as the anti-cross (talk) ability of the increase of the frequency bandwidth of vision signal is poorer,
Cause to introduce cross (talk) frequency point in vision signal, and amplifier can also amplify noise signal while amplifying useful signal.
In addition, the purpose of signal amplification is in order to enable signal transmits longer distance, there is no consider the suitable of receiving end
With ability.Receiving end needs to design adapter circuit, enables to be adapted to by adapter circuit in short-distance transmission and put
The amplitude of signal after big.Also, it is transmitted after being amplified since transmitting terminal is fixed to signal, although in the feelings of short-distance transmission
Receiving end can carry out compression processing to signal by adapter circuit under condition, to be adapted to the amplitude of amplified signal, still, no
The power wastage of Transmission system is caused avoidablely.
Summary of the invention
The embodiment of the present invention provides a kind of method for transmitting signals and equipment, to solve existing video signal transmission process
While middle promotion signal-to-noise ratio, the problem of will lead to noise signal amplification and system power dissipation caused to waste.
Specific technical solution provided in an embodiment of the present invention is as follows:
In a first aspect, the embodiment of the invention provides a kind of method for transmitting signals, comprising:
Transmitting terminal receives the preemphasis filter coefficient that receiving end is sent, wherein the preemphasis filter coefficient is institute
Receiving end is stated to be believed after determination needs to carry out the vision signal of transmission channel current transmission preemphasis processing according to the transmission
The frequency domain characteristic in road determines；
The transmitting terminal configures preemphasis filter using the preemphasis filter coefficient, and using described with postponing
Preemphasis filter handles the vision signal of the transmission channel current transmission；
Treated vision signal by the transmission channel is sent to receiving end by the transmitting terminal.
It is described before the transmitting terminal receives the preemphasis filter coefficient that receiving end is sent in possible embodiment
Method further include:
The transmitting terminal receives the instruction message that the receiving end is sent, wherein the instruction message is the receiving end
Determine the vision signal by the attenuation after the transmission channel be more than given threshold after send；
The transmitting terminal obtains the characteristic of the corresponding test signal of the transmission channel according to the instruction message, wherein
The characteristic of the test signal includes the number and the corresponding frequency of each test signal of the test signal, institute
The frequency of test signal is stated according to the bandwidth of the vision signal of the transmission channel current transmission and of the test signal
Number determines；
The transmitting terminal is superimposed test according to the characteristic of the test signal of acquisition in the vision signal of current transmission
Signal；
Vision signal after superposition test signal is sent to the receiving end by the transmission channel by the transmitting terminal.
In possible embodiment, the transmitting terminal is superimposed the test signal in the vision signal of current transmission, packet
It includes:
The transmitting terminal determines that the vision signal of the transmission channel current transmission is corresponding according to preset corresponding relationship
The number for the test signal being superimposed in the position of the blank lines of superposition test signal and the blank lines, the corresponding relationship are
The survey being superimposed in the position of the blank lines of superposition test signal and the blank lines in the mark of transmission channel, vision signal
Corresponding relationship between the number three of trial signal；
The transmitting terminal tests signal according to the corresponding superposition of vision signal of the transmission channel current transmission
The number for the test signal being superimposed in the position of blank lines and the blank lines, in the video of the transmission channel current transmission
The test signal is superimposed in signal.
In possible embodiment, the preemphasis filter coefficient is that the receiving end is needed in determination to transmission channel
It is determined after the vision signal progress preemphasis processing of transmission according to the frequency domain characteristic of the transmission channel, specifically:
The receiving end samples the vision signal of the transmission channel current transmission using preset sample frequency
Sampled data is obtained, the amplitude-frequency characteristic and phase-frequency characteristic of the transmission channel are determined according to the sampled data；
The receiving end determines the complex frequency response of the transmission channel according to the amplitude-frequency characteristic and the phase-frequency characteristic
With the conjugate complex frequency response of the transmission channel；
The receiving end is responded according to the complex frequency of the transmission channel and the conjugate complex frequency response of the transmission channel
Determine the preemphasis filter coefficient.
Second aspect, the embodiment of the invention provides a kind of method for transmitting signals, comprising:
Receiving end is after determination needs to carry out preemphasis processing to the vision signal of transmission channel, according to the transmission
The frequency domain characteristic of channel determines preemphasis filter coefficient；
The preemphasis filter coefficient is sent to the transmitting terminal by the receiving end, as described in transmitting terminal use
Preemphasis filter coefficient configures preemphasis filter, and uses with the preemphasis filter postponed to the transmission channel
After the vision signal of current transmission is handled, treated vision signal by the transmission channel is sent to the reception
End；
The receiving end receives treated the vision signal that the transmitting terminal is sent by the transmission channel.
In possible embodiment, the receiving end determines preemphasis filter coefficient according to the frequency domain characteristic of transmission channel
Before, the method also includes:
The receiving end determines the vision signal by the attenuation after the transmission channel more than given threshold
Afterwards, Xiang Suoshu transmitting terminal sends instruction message；
The receiving end receives the transmitting terminal and tests the video letter after signal by the superposition that the transmission channel is sent
Number, the vision signal after the superposition test signal obtains the transmission channel pair according to the instruction message by the transmitting terminal
Answer test signal characteristic after, according to the characteristic of the test signal of acquisition the transmission channel current transmission video
Superposition test signal obtains in signal, wherein the characteristic of the test signal includes the number of the test signal and each
The frequency of the corresponding frequency of the test signal, the test signal is believed according to the video of the transmission channel current transmission
Number bandwidth and it is described test signal number determine.
In possible embodiment, the receiving end determines preemphasis filter system according to the frequency domain characteristic of transmission channel
Number, comprising:
The receiving end is sampled to obtain using preset sample frequency to the vision signal of the transmission channel
Sampled data determines the amplitude-frequency characteristic and phase-frequency characteristic of the transmission channel according to the sampled data；
The receiving end determines the complex frequency response of the transmission channel according to the amplitude-frequency characteristic and the phase-frequency characteristic
With the conjugate complex frequency response of the transmission channel；
The receiving end is responded according to the complex frequency of the transmission channel and the conjugate complex frequency response of the transmission channel
Determine the preemphasis filter coefficient.
In possible embodiment, the receiving end receives the place that the transmitting terminal is sent by the transmission channel
After vision signal after reason, the method also includes:
The receiving end is if it is determined that treated the vision signal is super by the attenuation after the transmission channel
Given threshold is crossed, to received described treated that vision signal compensates by the transmission channel.
The third aspect, the embodiment of the invention provides a kind of sending ending equipments, comprising:
Receiving module, for receiving the preemphasis filter coefficient of receiving end transmission, wherein the preemphasis filter system
Number be the receiving end determine need to carry out the vision signal of transmission channel current transmission preemphasis processing after according to
The frequency domain characteristic of transmission channel determines；
Processing module, for configuring preemphasis filter using the preemphasis filter coefficient, and using with postponing
The preemphasis filter handles the vision signal of the transmission channel current transmission；
Sending module, for treated vision signal by the transmission channel to be sent to receiving end.
Fourth aspect, the embodiment of the invention provides a kind of receiving devices, comprising:
Processing module, for after determining and needing to carry out preemphasis processing to the vision signal of transmission channel, according to
The frequency domain characteristic of the transmission channel determines preemphasis filter coefficient；
Sending module is used for the preemphasis filter coefficient to be sent to the transmitting terminal by the transmitting terminal
The preemphasis filter coefficient configures preemphasis filter, and uses with the preemphasis filter postponed to the transmission
It, will be described in treated vision signal be sent to by the transmission channel after the vision signal of channel current transmission is handled
Receiving end；
Receiving module, for receive the transmitting terminal by the transmission channel send described in treated video believe
Number.
Based on the above-mentioned technical proposal, in the embodiment of the present invention, receiving end is determining the video needed to transmission channel
Preemphasis filter coefficient is determined according to the frequency domain characteristic of the transmission channel after signal progress preemphasis processing；Transmitting terminal according to
The preemphasis filter coefficient that receiving end is sent configures preemphasis filter, using with the preemphasis filter that postpones to institute
State transmission channel current transmission vision signal handled after, receiving end is sent to by the transmission channel, so as to
Preemphasis processing adaptively is carried out to vision signal, can effectively be avoided without being promoted in the case where promotion signal signal-to-noise ratio
The problems such as noise caused by the waste of system power dissipation caused by signal-to-noise ratio and base amplifier part amplifies.
Detailed description of the invention
Fig. 1 is the method flow schematic diagram that transmitting terminal carries out signal transmission in the embodiment of the present invention；
Fig. 2 is the schematic diagram of the vision signal in the embodiment of the present invention after superposition test signal；
Fig. 3 is the method flow schematic diagram that receiving end carries out signal transmission in the embodiment of the present invention；
Fig. 4 is the process schematic that receiving end determines preemphasis filter coefficient in the embodiment of the present invention；
Fig. 5 is signals transmission schematic diagram in the embodiment of the present invention；
Fig. 6 is signal transmission system configuration diagram in the embodiment of the present invention；
Fig. 7 is the structural schematic diagram of sending ending equipment in the embodiment of the present invention；
Fig. 8 is the structural schematic diagram of receiving device in the embodiment of the present invention.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with attached drawing to the present invention make into
It is described in detail to one step, it is clear that described embodiments are only a part of the embodiments of the present invention, rather than whole implementation
Example.Based on the embodiments of the present invention, obtained by those of ordinary skill in the art without making creative efforts
All other embodiment, shall fall within the protection scope of the present invention.
While in order to solve to promote signal-to-noise ratio during existing video signal transmission, will lead to noise signal amplification with
And the problem of causing system power dissipation to waste, the embodiment of the invention provides a kind of method for transmitting signals.
Method for transmitting signals provided by the embodiment of the present invention mainly uses feedback communication mechanism and digital preemphasis
Processing mode achievees the purpose that the signal-to-noise ratio of adaptively adjusting video signal transmission system, high under different transmission ranges to meet
Transmission performance and the transmission requirement of low-power consumption.
The embodiment of the present invention preferably is described in detail below in conjunction with attached drawing.
In the embodiment of the present invention, as shown in Figure 1, the method detailed process that transmitting terminal carries out signal transmission is as follows:
Step 101: transmitting terminal receives the preemphasis filter coefficient that receiving end is sent, wherein the preemphasis filter system
Number be receiving end determine need to carry out the vision signal of transmission channel current transmission preemphasis processing after believed according to the transmission
The frequency domain characteristic in road determines.
In the embodiment of the present invention, need the frequency domain to transmission channel special if the information that transmitting terminal is returned according to receiving end determines
Property tested, then in the vision signal of transmission channel current transmission increase test signal.
In the embodiment of the present invention, the information that transmitting terminal is fed back according to receiving end determines the frequency domain characteristic needed to transmission channel
View after being tested, in the vision signal of transmission channel current transmission after superposition test signal, after superposition to be tested to signal
Frequency signal is sent to receiving end by the transmission channel, is determined in advance by receiving end according to the vision signal after superposition test signal
Accentuation filter coefficient.
Specifically, before transmitting terminal receives the preemphasis filter coefficient that receiving end is sent, transmitting terminal sends superposition test
The process of the vision signal of signal is as follows:
Step a, transmitting terminal receive the instruction message that receiving end is sent, wherein the instruction message is that receiving end is determining view
Frequency signal after given threshold by the attenuation after transmission channel more than sending, and the instruction message is for notifying transmitting terminal to need
The frequency domain characteristic of the transmission signal is tested；
Step b, transmitting terminal obtain the characteristic of the corresponding test signal of the transmission channel according to the instruction message, wherein should
The characteristic of test signal includes the number and the corresponding frequency of each test signal of the test signal, a test signal
For a sine wave signal, the frequency of signal is tested according to the bandwidth and the test of the vision signal of transmission channel current transmission
The number of signal determines；
Step c, transmitting terminal are folded in the vision signal of transmission channel current transmission according to the characteristic of the test signal of acquisition
Add test signal；
Vision signal after superposition test signal is sent to receiving end by the transmission channel by step d, transmitting terminal.
Specifically, transmitting terminal be superimposed in the vision signal of transmission channel current transmission test signal process it is as follows: hair
Sending end determines the blank lines of the corresponding superposition test signal of the vision signal of transmission channel current transmission according to default corresponding relationship
Position and blank lines in the number of test signal that is superimposed, which is the mark of transmission channel, in vision signal
Corresponding pass between the number three for the test signal being superimposed in the position of the blank lines of superposition test signal and blank lines
System；Transmitting terminal according to the positions of the blank lines of the corresponding superposition test signal of the vision signal of the transmission channel current transmission and
The number for the test signal being superimposed in blank lines, the superposition test signal in the vision signal of transmission channel current transmission.
Specifically, the mark of transmission channel is for distinguishing different transmission channels, and transmission channel can be according to being used
The difference of transmission medium distinguish, be also possible to distinguish according to the different transmission bands of same transmission medium.Example
Such as, twisted pair, coaxial cable belong to different transmission channels, then mark used by mark corresponding to twisted pair and coaxial cable
Know not identical.In another example the first frequency range of coaxial cable belongs to different transmission channels from the second frequency range, then the of coaxial cable
The mark corresponding from the second frequency range of coaxial cable of mark corresponding to one frequency range belongs to different transmission channels.
Wherein, the sine wave signal with different frequent points can be generated in transmitting terminal, and a sine wave signal is a test
Signal, and the Signal averaging blank lines specified into vision signal will be tested.It is folded according in the vision signal received receiving end
The sine wave signal of the different frequent points added analyzes the frequency domain characteristic of transmission channel.It, can be according to vision signal in
Band bandwidth be configured to the frequency of the sine wave tested transmission channel.
Wherein, in the sine wave signal of the blank lines superposition different frequency of vision signal, sine wave signal is superimposed upon blanking
Effective video data field in row in addition to horizontal blanking area.The signal of vision signal after being illustrated in figure 2 superposition test signal
Figure, wherein Freq1, Freq2 ... Freqm respectively represent the frequency of the sine wave signal of superposition.Optionally, the sine being superimposed
The frequency of wave signal is gradually increased with the increase of the line number of blank lines, and the sine wave signal being superimposed in same blank lines
Frequency gradually increase.For example, Freq1, Freq2 ..., the frequency of Freqm is gradually increased.
In concrete application, needs to be superimposed the position of the blank lines of test signal and need to be superimposed the blank lines of test signal
Number can be pre-configured with, also, the number of test signal of each blank lines superposition can also be preset.
Wherein, the frequency for testing signal can be determining according to the band bandwidth of vision signal, or according to the special of signal
Demand is configured.For example, by taking the composite video signal of 30MHz bandwidth as an example, it is assumed that need to be superimposed in the composite video signal
The line number for testing the blank lines of signal is 10, and each blank lines are superimposed 10 sine wave signals with different frequency, then altogether
There are 100 sine wave signals with different frequency, if this 100 sine wave signals with different frequency are evenly distributed on this
In the frequency band of composite video signal, then interval is about 300KHz between the frequency point of sine wave signal, and being able to satisfy transmission completely, this is compound
The frequency district characteristic analysis of the transmission channel of vision signal.
Specifically, receiving end determines the process of preemphasis filter coefficient according to the frequency domain characteristic of transmission channel, specifically:
Step A, receiving end are sampled to obtain using preset sample frequency to the vision signal after superposition test signal
Sampled data determines the amplitude-frequency characteristic and phase-frequency characteristic of the transmission channel according to sampled data；
Step B, receiving end calculate the product of the amplitude-frequency characteristic He the phase-frequency characteristic, and the complex frequency for obtaining the transmission channel is rung
It answers, and the conjugation for calculating complex frequency response obtains the conjugate complex frequency response of the transmission channel；
Step C, receiving end determines that the maximum value of complex frequency response abscissa is the bandwidth of the vision signal, and determines
The maximum value of the conjugate complex frequency response abscissa is the sample frequency, in abscissa from 0 to model defined by the sample frequency
Interior progress N point sampling is enclosed, obtains N number of real number after N number of sample value that sampling obtains is carried out inverse discrete Fourier transform, it is right respectively
N number of real number is normalized to obtain the preemphasis filter coefficient of N rank preemphasis filter.
Step 102: transmitting terminal configures preemphasis filter using the preemphasis filter coefficient, and using pre- with postponing
Accentuation filter handles the vision signal of the transmission channel current transmission.
In the embodiment of the present invention, transmitting terminal is by preemphasis filter to more serious height of decaying in digital video signal
Frequency component carries out preemphasis processing, improves the signal-to-noise ratio of the vision signal of transmission, the party by increasing the energy of useful signal
Formula not will cause frequency intermodulation and noise amplification.
Assuming that the frequency domain characteristic of transmission channel is expressed as H (f), if the vision signal of transmitting terminal enter the transmission channel it
Preceding pre- first pass through is expressed as H-1(f) preemphasis filter then can reduce even counteracting transmission channel and cause to vision signal
Decaying, and different degrees of preemphasis processing may be implemented by adjusting the coefficient of preemphasis filter.
Step 103: transmitting terminal will be sent to by preemphasis filter treated vision signal by the transmission channel
Receiving end.
Based on the same inventive concept, in the embodiment of the present invention, as shown in figure 3, receiving end carries out the detailed side of signal transmission
Method process is as follows:
Step 301: receiving end after determining and needing to carry out preemphasis processing to the vision signal of transmission channel, according to
The frequency domain characteristic of transmission channel determines preemphasis filter coefficient.
In the embodiment of the present invention, before receiving end determines preemphasis filter coefficient according to the frequency domain characteristic of transmission channel,
Need to obtain the vision signal after superposition test signal, detailed process is as follows:
Receiving end determines that vision signal, more than after given threshold, is sent out by the attenuation after transmission channel to transmitting terminal
Instruction message is sent, the instruction message is for notifying transmitting terminal needs to test the frequency domain characteristic of the transmission signal；Receiving end
It receives transmitting terminal and tests the vision signal after signal by the superposition that transmission channel is sent, which tests the video letter after signal
Number by transmitting terminal according to the instruction message obtain the transmission channel it is corresponding test signal characteristic after, according to the test of acquisition
The characteristic of signal is superimposed test signal in the vision signal of the transmission channel current transmission and obtains, wherein the test signal
Characteristic includes testing the number and the corresponding frequency of each test signal of signal, and a test signal is a sine wave
It is true according to the bandwidth of the vision signal of transmission channel current transmission and the number of the test signal to test the frequency of signal for signal
It is fixed.
Specifically, it is assumed that the band bandwidth of vision signal is B, and the sample frequency of the DAC of transmitting terminal is fs.Receiving end according to
The frequency domain characteristic of transmission channel determines the detailed process of preemphasis filter coefficient as shown in figure 4, specific as follows:
Receiving end is sampled to obtain hits using preset sample frequency to the vision signal after superposition test signal
According to determining the amplitude-frequency characteristic and phase-frequency characteristic of the transmission channel according to the sampled data；
Receiving end calculates the product of the amplitude-frequency characteristic He the phase-frequency characteristic, and inverted, obtains the multifrequency of the transmission channel
Rate response, is expressed as 1/H (f), and the conjugation for calculating complex frequency response obtains the conjugate complex frequency response of the transmission channel；
Receiving end determines that the maximum value of complex frequency response abscissa is the bandwidth of the vision signal, and determines the conjugation
Complex frequency respond abscissa maximum value be the sample frequency, in abscissa is from 0 to the sample frequency limited range into
Row N point sampling obtains N number of real number after N number of sample value that sampling obtains is carried out inverse discrete Fourier transform (IDFT), right respectively
N number of real number is normalized to obtain the preemphasis filter coefficient of N rank preemphasis filter.
Step 302: preemphasis filter coefficient is sent to transmitting terminal by receiving end.
Specifically, after transmitting terminal receives the preemphasis filter coefficient that receiving end is sent, using the preemphasis filter system
Number configuration preemphasis filters, and using with the preemphasis filter that postpones to the vision signal of the transmission channel current transmission into
After row processing, treated vision signal by the transmission channel is sent to receiving end.
Step 303: receiving end receive transmitting terminal by the transmission channel send through preemphasis filter treated regard
Frequency signal.
Optionally, receiving end receive transmitting terminal by the transmission channel send through preemphasis filter treated video
After signal, however, it is determined that the attenuation after preemphasis filter treated vision signal is by the transmission channel is super
Given threshold is crossed, further to received treated that vision signal compensates by the transmission channel.
Optionally, cochannel co-cable transmission can be used between transmitting terminal and receiving end, to save channel resource.It needs
It is bright, it is herein only a kind of specific embodiment using cochannel co-cable transmission, the present invention is not intended to limit transmitting terminal and receives
The transmission mode used between end, protection scope of the present invention are not limited thereto system.Also, the present invention does not also limit transmitting terminal
Communication protocol used by being communicated with receiving end, random communication protocol can be applied in the present invention transmitting terminal and receiving end it
Between communication, it is only necessary to transmitting terminal and receiving end are made an appointment.
Signals transmission is provided for the embodiments of the invention below by way of two specific embodiments to be illustrated.
First specific embodiment, as shown in figure 5, transmitting terminal carries out the process of signal transmission specifically such as in the specific embodiment
Under:
Step 501: transmitting terminal is in original state, i.e., state after just powering on, transmission be not superimposed test signal and without
The vision signal of preemphasis processing；
Step 502: transmitting terminal judges whether to need to be superimposed test signal in video signals, specifically, if transmitting terminal connects
Receive the instruction message of receiving end transmission, it is determined that it needs to be superimposed test signal in video signals, executes step 503, otherwise,
Determination does not need to be superimposed test signal in video signals, executes step 504, wherein the instruction message is receiving end in determination
Attenuation of the vision signal after transmission channel is sent after being greater than preset threshold；
Step 503: being superimposed in the corresponding test signal of transmission channel and vision signal of transmitting terminal acquisition vision signal
The number for testing the test signal that the position of the blank lines of signal is superimposed with the blank lines, according to the position of the blank lines and is somebody's turn to do
The number of the test signal of blank lines superposition, is superimposed the test signal in video signals, the video after superposition to be tested to signal
Signal is sent to receiving end；
Step 504: transmitting terminal judges whether to need to carry out preemphasis processing to vision signal, specifically, if transmitting terminal connects
Receive the preemphasis filter coefficient of receiving end transmission, it is determined that need to carry out preemphasis processing to vision signal, execute step
505, otherwise, it determines not needing to carry out preemphasis processing to vision signal, execute step 506；
Step 505: transmitting terminal carries out preemphasis processing to vision signal using preemphasis filter；
Step 506: transmitting terminal sends vision signal.
Wherein, in step 502 method of determination of preset threshold include but is not limited to be exemplified below it is several: 1, statistics is without declining
The average value of the energy of the transmission signal subtracted, using the average value as the preset threshold；2, preset threshold is corresponding for AD full scale
Color carrier theoretical value, in this case, using the color carrier region in composite video signal, calculate the amplitude information of color carrier with
AD full scale corresponding color carrier theoretical value in receiving end is compared, it is determined whether needs to carry out preemphasis processing.
In the specific embodiment, the process that receiving end carries out signal processing is specific as follows:
Step 507: receiving end judges whether to need to carry out vision signal attenuation compensation, specifically, pre- if not carrying out
Aggravate the vision signal of processing, it is determined that do not need to carry out attenuation compensation, execute step 509；If determining video after attenuation analysis
The attenuation of signal is not more than preset threshold, it is determined that does not need to carry out attenuation compensation, executes step 509；If after attenuation analysis
It determines that the attenuation of vision signal is greater than preset threshold, executes step 508；
Step 508: receiving end carries out attenuation compensation to vision signal；
Step 509: receiving end samples vision signal；
Step 510: the vision signal after receiving end samples step 509 carries out attenuation analysis, however, it is determined that attenuation is greater than
Preset threshold thens follow the steps 511, otherwise, executes step 512；
Step 511: receiving end to transmitting terminal send be used to indicate to vision signal be superimposed test signal instruction message or
Preemphasis filter coefficient is sent, that is, after turning step 502 or step 504, or the control information of generation progress attenuation compensation
Turn to go step 507；
Step 512；Vision signal after receiving end samples step 509 is decoded output, and process terminates.
In the specific embodiment, transmitting terminal original state (when just powering on) transmission is not superimposed test signal and without pre-add
The vision signal handled again, after receiving end receives the vision signal and samples, the sampled data obtained to sampling decays
Analysis:
If a) signal decaying is not more than the first preset threshold, such as under short-distance transmission, then do not need to carry out pre-add
Processing is again to promote signal-to-noise ratio；
If b) signal decaying is greater than the first preset threshold, transmission channel need to be analyzed to determine that vision signal declines
Subtract characteristic, specific as follows: receiving end sends the instruction message for being tested transmission channel to transmitting terminal；Transmitting terminal receives
To after the instruction message, the corresponding test signal of transmission channel is obtained, superposition test signal will be folded to the blank lines of vision signal
Vision signal after adding test signal is sent to receiving end, and informs that receiving end can carry out the frequency domain characteristic point of transmission channel
Analysis.
After receiving end receives the notification message for the frequency district characteristic analysis that can carry out transmission channel of transmitting terminal, to superposition
After vision signal after test signal is sampled, analysis obtains sampled data and obtains amplitude-frequency characteristic and the phase frequency spy of transmission channel
Property, preemphasis filter coefficient is calculated according to the amplitude-frequency characteristic and phase-frequency characteristic, which is sent
To transmitting terminal.
Transmitting terminal is adjusted the coefficient of preemphasis filter using the preemphasis filter coefficient received, using tune
Preemphasis filter after whole carries out preemphasis processing to vision signal, will treated that vision signal is sent to by preemphasis
Receiving end is simultaneously stopped superposition test signal in video signals.
If c) signal decaying is greater than the second preset threshold, wherein the second preset threshold is greater than the first preset threshold, then removes
It is outer that preemphasis processing carried out to vision signal according to b), receiving end also needs that treated that vision signal declines to preemphasis
Subtract compensation, so that the available effective recovery of vision signal.
Second specific embodiment, the framework of signal transmission system is as shown in fig. 6, the signal transmission system mainly includes sending
End 60 and receiving end 61.
Wherein, transmitting terminal 60 includes test Signal averaging module 601, preemphasis filtering module 602, signal transmitting module
603 and signal receiving module 604.
Specifically, the signal transmitting module 603 of transmitting terminal is mainly used for: completing digital-to-analogue conversion and the hair of vision signal
It send.
Specifically, the preemphasis filtering module 602 of transmitting terminal is mainly used for: more serious to decaying in digital video signal
High fdrequency component carry out exacerbation processing, improve the signal-to-noise ratio of the vision signal of transmission by increasing the energy of useful signal, should
Mode not will cause frequency cross (talk) and noise amplification.Assuming that the frequency domain characteristic of transmission channel is expressed as H (f), if transmitting terminal
Vision signal first passes through in advance before entering the transmission channel and is expressed as H-1(f) preemphasis filter then can reduce even
It offsets transmission channel to decay caused by vision signal, and different journeys may be implemented by adjusting the system of preemphasis filter
The preemphasis of degree is handled.
Specifically, the test Signal averaging module 601 of transmitting terminal is mainly used for: generating, there is the sine wave of different frequent points to believe
Number, a sine wave signal is a test signal, will test the Signal averaging blank lines specified into vision signal.Receiving end
It is analyzed according to frequency domain characteristic of the sine wave signal for the different frequent points being superimposed in the vision signal received to transmission signal.
Wherein, the test Signal averaging module 601 of transmitting terminal can be used for according to the band bandwidth flexible configuration of vision signal to transmission
The frequency for the sine wave that channel is tested.
Specifically, the signal receiving module 604 of transmitting terminal is mainly used for receiving the signal that receiving end is sent.
Wherein, receiving end 61 includes attenuation compensation and signal sampling module 611, signal attenuation analysis module 612, communication mould
Block 613 and signal decoded output module 614.
Specifically, the attenuation compensation of receiving end and signal sampling module 611 are mainly used for: receiving vision signal and to video
Signal carries out analog-to-digital conversion and/or carries out attenuation compensation to the vision signal.
The signal attenuation analysis module 612 of receiving end is mainly used for: after sampling to attenuation compensation and signal sampling module 611
Vision signal analyzed, judge whether the decaying of the vision signal is higher than given threshold, if so, to transmitting terminal transmission refer to
Show message, which, which is used to indicate, carries out frequency domain characteristic test to the transmission channel for transmitting the vision signal.And it is used for
Amplitude-frequency and phase frequency analysis are carried out to the test signal in vision signal, determine preemphasis filter coefficient, and pass through communication module
The preemphasis filter coefficient is sent to transmitting terminal by 613, is configured with the preemphasis filtering module to transmitting terminal.And it uses
In the control information compensated to attenuation compensation and 611 feedback attenuation of signal sampling module, by attenuation compensation and signal sampling module
611 carry out attenuation compensations, and the purpose of attenuation compensation is in the case where signal decays serious situation to preemphasis treated video
Signal is further compensated.
The communication module 613 of receiving end is mainly used for completing the information exchange with transmitting terminal.
The signal decoded output module 614 of receiving end is mainly used for completing the decoded output of signal.
Based on the same inventive concept, a kind of sending ending equipment, the tool of the sending ending equipment are provided in the embodiment of the present invention
Body is implemented to can be found in the description of embodiment of the method part, and overlaps will not be repeated, as shown in fig. 7, the sending ending equipment is main
Include:
Receiving module 701, for receiving the preemphasis filter coefficient of receiving end transmission, wherein the preemphasis filtering
Device coefficient is the receiving end in determining basis after needing to carry out the vision signal of transmission channel current transmission preemphasis processing
The frequency domain characteristic of the transmission channel determines；
Processing module 702 for configuring preemphasis filter using the preemphasis filter coefficient, and is postponed using matching
The preemphasis filter vision signal of the transmission channel current transmission is handled；
Sending module 703, for treated vision signal by the transmission channel to be sent to receiving end.
In possible embodiment, the receiving module is also used to:
Receive the instruction message that the receiving end is sent, wherein the instruction message is the receiving end described in the determination
Vision signal by the attenuation after the transmission channel be more than given threshold after send；
The processing module is also used to obtain the spy of the corresponding test signal of the transmission channel according to the instruction message
Property, wherein the characteristic of the test signal includes that the number of the test signal and each test signal respectively correspond to
Frequency, the frequency of the test signal is according to the bandwidth and the test of the vision signal of the transmission channel current transmission
The number of signal determines；According to the characteristic of the test signal of acquisition in the vision signal of the transmission channel current transmission
Superposition test signal；
The sending module is also used to: the vision signal after superposition to be tested to signal is sent to institute by the transmission channel
State receiving end.
Specifically, a test signal is a sine wave signal.
In possible embodiment, the processing module is specifically used for:
According to preset corresponding relationship, the corresponding superposition test letter of the vision signal of the transmission channel current transmission is determined
Number blank lines position and the blank lines in be superimposed test signal number, the corresponding relationship be transmission channel mark
The number for the test signal being superimposed in the position and the blank lines of the blank lines of test signal is superimposed in knowledge, vision signal
Corresponding relationship between three；
According to the position of the blank lines of the corresponding superposition test signal of the vision signal of the transmission channel current transmission
Set and the blank lines in be superimposed test signal number, be superimposed in the vision signal of the transmission channel current transmission
The test signal.
In possible embodiment, the preemphasis filter coefficient is that the receiving end is needed in determination to transmission channel
It is determined after the vision signal progress preemphasis processing of transmission according to the frequency domain characteristic of the transmission channel, specifically:
The receiving end is sampled to obtain using preset sample frequency to the vision signal of the transmission channel
Sampled data determines the amplitude-frequency characteristic and phase-frequency characteristic of the transmission channel according to the sampled data；
The receiving end determines the complex frequency response of the transmission channel according to the amplitude-frequency characteristic and the phase-frequency characteristic
With the conjugate complex frequency response of the transmission channel；
The receiving end is responded according to the complex frequency of the transmission channel and the conjugate complex frequency response of the transmission channel
Determine the preemphasis filter coefficient.
Specifically, the receiving end calculates the product of the amplitude-frequency characteristic and the phase-frequency characteristic, obtains the transmission letter
The complex frequency in road responds, and the conjugation for calculating the complex frequency response obtains the conjugate complex frequency response of the transmission channel；
The receiving end determines that the maximum value of the complex frequency response abscissa is the bandwidth of the vision signal, and really
The maximum value of the fixed conjugate complex frequency response abscissa is the sample frequency, in abscissa from 0 to the sample frequency institute
N point sampling is carried out in the range of restriction, and sampling is obtained after N number of sample value carries out inverse discrete Fourier transform and obtains N number of real number,
N number of real number is normalized respectively to obtain the preemphasis filter coefficient.
Based on the same inventive concept, a kind of receiving device, the tool of the receiving device are provided in the embodiment of the present invention
Body is implemented to can be found in the description of embodiment of the method part, and overlaps will not be repeated, as shown in figure 8, the receiving device is main
Include:
Processing module 801, for after determining and needing to carry out preemphasis processing to the vision signal of transmission channel, root
Preemphasis filter coefficient is determined according to the frequency domain characteristic of the transmission channel；
Sending module 802 is adopted for the preemphasis filter coefficient to be sent to the transmitting terminal by the transmitting terminal
Preemphasis filter is configured with the preemphasis filter coefficient, and is used with the preemphasis filter postponed to the biography
After the vision signal of defeated channel current transmission is handled, treated vision signal by the transmission channel is sent to institute
State receiving end；
Receiving module 803, for receive the transmitting terminal by the transmission channel send described in treated video
Signal.
In possible embodiment, the sending module is also used to: determining that the vision signal passes through the transmission channel
Attenuation after transmission is more than Xiang Suoshu transmitting terminal transmission instruction message after given threshold；
The receiving module is also used to: being received after the superposition that the transmitting terminal is sent by the transmission channel tests signal
Vision signal, the vision signal after the superposition test signal obtains the biography according to the instruction message by the transmitting terminal
After the corresponding characteristic for testing signal of defeated channel, forward pass is worked as in the transmission channel according to the characteristic of the test signal of acquisition
Superposition test signal obtains in defeated vision signal, wherein the characteristic of the test signal includes the number of the test signal
And the corresponding frequency of each test signal, the frequency of the test signal is according to the transmission channel current transmission
Vision signal bandwidth and it is described test signal number determine.Specifically, a test signal is a sine
Wave signal.
In possible embodiment, the processing module is specifically used for:
It is sampled to obtain sampled data, root using vision signal of the preset sample frequency to the transmission channel
The amplitude-frequency characteristic and phase-frequency characteristic of the transmission channel are determined according to the sampled data；
According to the amplitude-frequency characteristic and the phase-frequency characteristic, the complex frequency response and the transmission of the transmission channel are determined
The conjugate complex frequency response of channel；
It is determined according to the response of the complex frequency of the transmission channel and the conjugate complex frequency response of the transmission channel described pre-
Accentuation filter coefficient.
Specifically, the processing module is specifically used for:
The product for calculating the amplitude-frequency characteristic and the phase-frequency characteristic obtains the complex frequency response of the transmission channel, and
The conjugation for calculating the complex frequency response obtains the conjugate complex frequency response of the transmission channel；
It determines that the maximum value of the complex frequency response abscissa is the bandwidth of the vision signal, and determines the conjugation
The maximum value that complex frequency responds abscissa is the sample frequency, in abscissa from 0 to the sample frequency limited range
Sampling is obtained after N number of sample value carries out inverse discrete Fourier transform and obtains N number of real number, respectively to described by interior progress N point sampling
N number of real number is normalized to obtain the preemphasis filter coefficient.
In possible embodiment, the processing module is also used to: being received the transmitting terminal in the receiving module and is passed through
After treated the vision signal that the transmission channel is sent, however, it is determined that described treated that vision signal passes through is described
Attenuation after transmission channel is more than given threshold, to by the transmission channel, received described treated that video is believed
It number compensates.
It should be understood by those skilled in the art that, the embodiment of the present invention 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 present invention
Apply the form of example.Moreover, it wherein includes the computer of computer usable program code that the present invention, which can be used in one or more,
The shape for the computer program product implemented in usable storage medium (including but not limited to magnetic disk storage and optical memory etc.)
Formula.
The present invention be referring to according to the method for the embodiment of the present invention, the process of equipment (system) and computer program product
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.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
Mind and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to include these modifications and variations.
Claims (8)
1. a kind of method for transmitting signals characterized by comprising
Transmitting terminal receives the preemphasis filter coefficient that receiving end is sent, wherein the preemphasis filter coefficient is described connects
Receiving end is after determination needs to carry out the vision signal of transmission channel current transmission preemphasis processing according to the transmission channel
Frequency domain characteristic determines；
The transmitting terminal configures preemphasis filter using the preemphasis filter coefficient, and using with the pre-add postponed
Weight filter handles the vision signal of the transmission channel current transmission；
Treated vision signal by the transmission channel is sent to receiving end by the transmitting terminal；
Before the transmitting terminal receives the preemphasis filter coefficient that receiving end is sent, the method also includes:
The transmitting terminal receives the instruction message that the receiving end is sent, wherein the instruction message is the receiving end true
The fixed vision signal is by the attenuation after the transmission channel more than sending after given threshold；
The transmitting terminal obtains the characteristic of the corresponding test signal of the transmission channel according to the instruction message, wherein described
The characteristic of test signal includes the number and the corresponding frequency of each test signal of the test signal, the survey
The frequency of trial signal is true according to the bandwidth of the vision signal of the transmission channel current transmission and the number of the test signal
It is fixed；
The transmitting terminal is superimposed test signal according to the characteristic of the test signal of acquisition in the vision signal of current transmission；
Vision signal after superposition test signal is sent to the receiving end by the transmission channel by the transmitting terminal,
In, the receiving end samples the vision signal after the superposition test signal using preset sample frequency, determines institute
State the frequency domain characteristic of transmission channel.
2. the method as described in claim 1, which is characterized in that the transmitting terminal is superimposed institute in the vision signal of current transmission
State test signal, comprising:
The transmitting terminal determines the corresponding superposition of vision signal of the transmission channel current transmission according to preset corresponding relationship
Test the number for the test signal being superimposed in the position and the blank lines of the blank lines of signal, the preset corresponding relationship
For what is be superimposed in the position of the blank lines of superposition test signal in the mark of transmission channel, vision signal and the blank lines
Test the corresponding relationship between the number three of signal；
The transmitting terminal tests the blanking of signal according to the corresponding superposition of vision signal of the transmission channel current transmission
The number for the test signal being superimposed in capable position and the blank lines, in the vision signal of the transmission channel current transmission
The middle superposition test signal.
3. the method as described in claim 1, which is characterized in that the preemphasis filter coefficient is the receiving end in determination
It is determined after needing to carry out the vision signal of transmission channel preemphasis processing according to the frequency domain characteristic of the transmission channel, tool
Body are as follows:
The receiving end samples the vision signal after the superposition test signal using preset sample frequency and is adopted
Sample data determine the amplitude-frequency characteristic and phase-frequency characteristic of the transmission channel according to the sampled data；
The receiving end determines complex frequency response and the institute of the transmission channel according to the amplitude-frequency characteristic and the phase-frequency characteristic
State the conjugate complex frequency response of transmission channel；
The receiving end is determined according to the response of the complex frequency of the transmission channel and the conjugate complex frequency response of the transmission channel
The preemphasis filter coefficient.
4. a kind of method for transmitting signals characterized by comprising
Receiving end is after determination needs to carry out preemphasis processing to the vision signal of transmission channel, according to the transmission channel
Frequency domain characteristic determine preemphasis filter coefficient；
The preemphasis filter coefficient is sent to transmitting terminal by the receiving end, is filtered by the transmitting terminal using the preemphasis
Wave device coefficient configures preemphasis filter, and uses with the preemphasis filter postponed to the transmission channel current transmission
Vision signal handled after, treated vision signal by the transmission channel is sent to the receiving end；
The receiving end receives treated the vision signal that the transmitting terminal is sent by the transmission channel；
Before the receiving end determines preemphasis filter coefficient according to the frequency domain characteristic of transmission channel, the method also includes:
The receiving end determine the vision signal by the attenuation after the transmission channel be more than given threshold after, to
The transmitting terminal sends instruction message；
The receiving end receives the transmitting terminal and tests the vision signal after signal by the superposition that the transmission channel is sent, and adopts
The vision signal after the superposition test signal is sampled with preset sample frequency, determines the frequency domain of the transmission channel
Characteristic, the vision signal being superimposed after testing signal obtain the transmission channel according to the instruction message by the transmitting terminal
It is corresponding test signal characteristic after, according to the characteristic of the test signal of acquisition the transmission channel current transmission view
Superposition test signal obtains in frequency signal, wherein the characteristic of the test signal includes the number of the test signal and every
The corresponding frequency of a test signal, the frequency of the test signal is according to the video of the transmission channel current transmission
The bandwidth of signal and the number of the test signal determine.
5. method as claimed in claim 4, which is characterized in that the receiving end determines pre- according to the frequency domain characteristic of transmission channel
Accentuation filter coefficient, comprising:
The receiving end samples the vision signal after the superposition test signal using preset sample frequency and is adopted
Sample data determine the amplitude-frequency characteristic and phase-frequency characteristic of the transmission channel according to the sampled data；
The receiving end determines complex frequency response and the institute of the transmission channel according to the amplitude-frequency characteristic and the phase-frequency characteristic
State the conjugate complex frequency response of transmission channel；
The receiving end is determined according to the response of the complex frequency of the transmission channel and the conjugate complex frequency response of the transmission channel
The preemphasis filter coefficient.
6. method as claimed in claim 4, which is characterized in that the receiving end receives the transmitting terminal and believed by the transmission
After treated the vision signal that road is sent, the method also includes:
The receiving end is if it is determined that treated the vision signal by the attenuation after the transmission channel is more than to set
Threshold value is determined, to received described treated that vision signal compensates by the transmission channel.
7. a kind of sending ending equipment characterized by comprising
Receiving module, for receiving the preemphasis filter coefficient of receiving end transmission, wherein the preemphasis filter coefficient is
The receiving end is after determination needs to carry out the vision signal of transmission channel current transmission preemphasis processing according to the transmission
The frequency domain characteristic of channel determines；
Processing module, for configuring preemphasis filter using the preemphasis filter coefficient, and using described with postponing
Preemphasis filter handles the vision signal of the transmission channel current transmission；
Sending module, for treated vision signal by the transmission channel to be sent to receiving end；
The receiving module is also used to receive the instruction message that the receiving end is sent, wherein the instruction message is described connects
Receiving end determine the vision signal by the attenuation after the transmission channel be more than given threshold after send；
The processing module is also used to obtain the characteristic of the corresponding test signal of the transmission channel according to the instruction message,
Wherein, the characteristic of the test signal includes the number and the corresponding frequency of each test signal of the test signal
Rate, bandwidth and the test signal of the frequency for testing signal according to the vision signal of the transmission channel current transmission
Number determine；Test signal is superimposed in the vision signal of current transmission according to the characteristic of the test signal of acquisition；
The sending module, the vision signal after being also used to test superposition signal are sent to described connect by the transmission channel
Receiving end, wherein the receiving end samples the vision signal after the superposition test signal using preset sample frequency,
Determine the frequency domain characteristic of the transmission channel.
8. a kind of receiving device characterized by comprising
Processing module, for after determining and needing to carry out preemphasis processing to the vision signal of transmission channel, according to described
The frequency domain characteristic of transmission channel determines preemphasis filter coefficient；
Sending module uses the pre-add by the transmitting terminal for the preemphasis filter coefficient to be sent to transmitting terminal
Weight filter coefficient configures preemphasis filter, and using current to the transmission channel with the preemphasis filter postponed
After the vision signal of transmission is handled, treated vision signal by the transmission channel is sent to the receiving end；
Receiving module, for receive the transmitting terminal by the transmission channel send described in treated vision signal；
The sending module is also used to determine the vision signal by the attenuation after the transmission channel more than setting
After threshold value, Xiang Suoshu transmitting terminal sends instruction message；
The receiving module is also used to receive the transmitting terminal and tests the view after signal by the superposition that the transmission channel is sent
Frequency signal samples the vision signal after the superposition test signal using preset sample frequency, determines the transmission
The frequency domain characteristic of channel, the vision signal being superimposed after testing signal obtain institute according to the instruction message by the transmitting terminal
After the characteristic for stating the corresponding test signal of transmission channel, worked as according to the characteristic of the test signal of acquisition in the transmission channel
Superposition test signal obtains in the vision signal of preceding transmission, wherein the characteristic of the test signal includes the test signal
The frequency of number and the corresponding frequency of each test signal, the test signal is current according to the transmission channel
The bandwidth of the vision signal of transmission and the number of the test signal determine.
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| CN107896311B (en) * | 2017-11-28 | 2020-09-29 | 浙江大华技术股份有限公司 | Video compensation method and device |
| EP3813360A4 (en) | 2018-07-25 | 2021-09-01 | Hangzhou Hikvision Digital Technology Co., Ltd. | Method and device for video signal identification, electronic device, and readable storage medium |
| CN113141196B (en) * | 2020-01-20 | 2022-12-27 | 华为技术有限公司 | Channel compensation method and communication device |
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Effective date of registration: 20200925 Address after: Room 1201, building a, 1181 Bin'an Road, Changhe street, Binjiang District, Hangzhou City, Zhejiang Province Patentee after: Zhejiang Xinsheng Electronic Technology Co., Ltd Address before: Hangzhou City, Zhejiang province Binjiang District 310053 shore road 1187 Patentee before: ZHEJIANG DAHUA TECHNOLOGY Co.,Ltd. |