CN102724516B - Adaptive signal processing method, device and decoder - Google Patents
Adaptive signal processing method, device and decoder Download PDFInfo
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Abstract
The embodiments of the invention provide an adaptive signal processing method, a device and a decoder. The method comprises the following steps: determining the type of an analog video signal by identifying the frequency of a chrominance subcarrier of the analog video signal by utilizing the characteristic that chrominance subcarriers of different types of analog video signals have different frequencies; and determining a corresponding decoding method from preserved decoding methods according to the determined type of the analog video signal, and decoding the analog video signal by using the corresponding decoding method. Thus, whatever type of analog video signal provided by a video source, the analog video signal can be processed adaptively, so that the support for video source compatibility is realized.
Description
Technical field
The present invention relates to the communications field, relate in particular to a kind of adaptive signal processing method, device and decoder.
Background technology
In security protection industry, analog video camera is sent to back-end code device by analog video signal from video camera end by coaxial cable and encodes or preview, and back-end code device generally adopts the specialized simulation Video Decoder of the composite video analog video signal of decoding.
At present the analog video decoder device of main flow comprises: for SD analog video signal (comprising the composite video broadcast singal (CVBS of the 960H form of 720H form or expansion, Composite VideoBroadcast Signal)) decoder, and for the decoder of high definition analog video signal (comprising the analog video signal of 1280H form).Existing analog video decoder device is by fixing decoding process decoding SD analog video signal or high definition analog video signal,, an analog video decoder device can only be identified a kind of analog video signal decoding, and the another kind of analog video signal of None-identified to its decoding, as, the analog video decoder device of SD analog video signal of can decoding can only be identified and decode the SD analog video signal receiving, and the high definition analog video signal that None-identified receives decoding.
Therefore, an analog video decoder device cannot be supported identification and the decoding to high definition analog video signal and SD analog video signal simultaneously.In video source, SD analog video signal may be provided, in the time of also may providing high definition analog video signal, the support to video source compatibility cannot be guaranteed.
Summary of the invention
The embodiment of the present invention provides a kind of adaptive signal processing method, device and decoder, for realizing the support to video source compatibility.
An adaptive signal processing method, described method comprises:
Determine the frequency of chrominance carrier in the analog video signal receiving;
According to the frequency of chrominance carrier, determine the type of the analog video signal receiving;
From the decoding process of preserving in advance, determine decoding process corresponding to the type, utilize the decoding process of determining to decode to described analog video signal.
An Adaptive Signal Processing device, described device comprises:
Recognition unit, for determining the frequency of the analog video signal chrominance carrier receiving, determines the type of the analog video signal receiving according to the frequency of chrominance carrier;
Decoding unit, determines decoding process corresponding to the type for the decoding process from preserving in advance, utilizes the decoding process of determining to decode to described analog video signal.
An analog video decoder device, described decoder comprises Adaptive Signal Processing device as above.
The scheme providing according to the embodiment of the present invention, the feature of utilizing the frequency of the chrominance carrier of dissimilar analog video signal there are differences, by the identification of the frequency of chrominance carrier being determined to the type of analog video signal, and can be according to the type of the analog video signal of determining, from the decoding process of preserving in advance, definite corresponding decoding process is decoded to analog video signal.Thereby why type make signal that no matter video source provides analog video signal, the processing to analog video signal adaptively, realizes the support to video source compatibility.
Accompanying drawing explanation
The flow chart of steps of the adaptive signal processing method that Fig. 1 provides for the embodiment of the present invention one;
The analog video signal time-domain diagram that Fig. 2 provides for the embodiment of the present invention one;
The schematic flow sheet of the adaptive signal processing method that Fig. 3 provides for the embodiment of the present invention two;
The structural representation of the Adaptive Signal Processing device that Fig. 4 provides for the embodiment of the present invention three.
Embodiment
In the scheme that the embodiment of the present invention provides, by determining the frequency of chrominance carrier in analog video signal, determine that analog video signal is high definition analog video signal, or SD analog video signal, and can, according to the type of the analog video signal of determining, select corresponding data channel, filter and sampling clock to carry out treatment of simulated vision signal.Thereby no matter the analog video signal that video source provides is high definition analog video signal or SD analog video signal, all can realize the processing to analog video signal, thereby realize the support to video source compatibility.
Below in conjunction with Figure of description and each embodiment, the present invention program is described.
Embodiment mono-,
The embodiment of the present invention one provides a kind of adaptive signal processing method, and the steps flow chart of the method can as shown in Figure 1, comprise:
Step 101, determine the type of analog video signal.
The feature different according to the chrominance subcarrier frequency of dissimilar analog video signal, in this step, can determine the frequency of chrominance carrier in the analog video signal receiving, according to the frequency of chrominance carrier, determine the type of the analog video signal receiving.
For example, the chrominance subcarrier frequency of SD analog video signal is different from the chrominance subcarrier frequency of high definition analog video signal.In the present embodiment, the feature there are differences according to the frequency of the chrominance carrier of SD analog video signal and high definition analog video signal, identifies the type of analog video signal by the frequency of identification chrominance carrier.Certainly, the chrominance subcarrier frequency of the high definition analog video signal of different-format may be also different.In the present embodiment, the feature that can also there are differences according to the frequency of the chrominance carrier of the high definition analog video signal of different-format, identifies the high definition analog video signal of different-format by the frequency of identification chrominance carrier.
The chrominance subcarrier frequency of supposing SD analog video signal is the first setpoint frequency, the chrominance subcarrier frequency of high definition analog video signal is the second setpoint frequency, in the analog video signal receiving by judgement, whether the frequency of chrominance carrier is the first setpoint frequency or the second setpoint frequency, can judge that analog video signal is SD analog video signal, or high definition analog video signal:
If determine that the frequency of chrominance carrier in the analog video signal receiving is the first setpoint frequency, can determine that the analog video signal receiving is SD analog video signal, if determine that the frequency of chrominance carrier in the analog video signal receiving is the second setpoint frequency, can determine that the analog video signal receiving is high definition analog video signal.
Concrete, the reference frequency arranging of can take is reference, the mode contrasting by the reference frequency with arranging, determines whether the frequency of chrominance carrier is the first setpoint frequency or the second setpoint frequency.
As shown in Figure 2, because the analog video signal chrominance carrier of (comprising SD analog video signal and high definition analog video signal) (Reference numeral 2 sensings place in Fig. 2) is all arranged in row synchronous head (1 sensing place of Fig. 2 Reference numeral) afterwards, therefore, the frequency values that judges the chrominance carrier of the synchronous head rear end of being expert at, can distinguish analog video signal is SD analog video signal or high definition analog video signal.
Therefore, in this step, can the reference frequency of the frequency of this signal and setting be contrasted by the colourity negative carrier signal in colour burst region in the every a line analog video signal of locking, determine whether the frequency of this signal is the first setpoint frequency or the second setpoint frequency.
The CVBS that the SD analog video signal of take is 720H form or the CVBS of 960H form are example, corresponding, the chrominance subcarrier frequency of SD analog video signal is 4.43MHz or 3.58MHz.Take high definition analog video signal as 1280H form be example, corresponding, the chrominance subcarrier frequency of high definition analog video signal is 18MHz.Now, the reference frequency of chrominance subcarrier frequency and setting can be contrasted, when definite chrominance subcarrier frequency is 4.43MHz or 3.58MHz, can determine that the analog video signal receiving is SD analog video signal.When definite chrominance subcarrier frequency is 18MHz, can determine that the analog video signal receiving is high definition analog video signal.Take high definition analog video signal as 1920H form be example, corresponding, the chrominance subcarrier frequency of high definition analog video signal is 36MHz.Now, the reference frequency of chrominance subcarrier frequency and setting can be contrasted, when definite chrominance subcarrier frequency is 4.43MHz or 3.58MHz, can determine that the analog video signal receiving is SD analog video signal.When definite chrominance subcarrier frequency is 36MHz, can determine that the analog video signal receiving is high definition analog video signal.
Step 102, analog video signal is decoded.
In this step, can, according to the type of the analog video signal identifying, analog video signal be decoded.Concrete, can from the decoding process of preserving in advance, determine decoding process corresponding to the type, utilize the decoding process of determining to decode to described analog video signal.
If determine that the analog video signal receiving is SD analog video signal, before decoding, after step 101, (certain before step 102, also after can determining corresponding decoding process the decoding process from preserving in advance, before decoding), also comprise: utilizing cut-off frequency is that the low pass filter of the first cut-off frequency carries out filtering to analog video signal.
Now, this step (step 102) specifically comprises: from the decoding process of preserving in advance, determine decoding process corresponding to SD analog video signal, utilize sample frequency be the clock of the first sample frequency as synchronized sampling clock, by the decoding process of determining, the analog video signal after is after filtering decoded.
When SD analog video signal is the CVBS of 720H form or the CVBS of 960H form, preferably, the first cut-off frequency can be 8MHz, and the first sample frequency can be 27MHz, and the decoding process of determining can be CVBS canonical solution coding mode.
If determine that the analog video signal receiving is high definition analog video signal, before decoding, after step 101, (certain before step 102, also after can determining corresponding decoding process the decoding process from preserving in advance, before decoding), also comprise: utilizing cut-off frequency is that the low pass filter of the second cut-off frequency carries out filtering to analog video signal.
Now, this step (step 102) specifically comprises: from the decoding process of preserving in advance, determine decoding process corresponding to high definition analog video signal, utilize sample frequency be the clock of the second sample frequency as synchronized sampling clock, by the decoding process of determining, the analog video signal after is after filtering decoded.
When high definition analog video signal is 1280H form, preferably, the second cut-off frequency can be 20MHz, and the second sample frequency can be 54MHz, and the decoding process of determining can be high definition analog video signal standards decoding process.
When high definition analog video signal is 1920H form, the second cut-off frequency can be 40 ~ 50MHz, and preferably, the second cut-off frequency can adopt 45MHz.The second sample frequency can be for being not less than 100MHz, and preferably, the second sample frequency can adopt 108MHz or 120MHz, and the decoding process of determining can be high definition analog video signal standards decoding process.
Step 103, export decoded signal.
In this step, for the ease of follow-up signal transmission, demonstration etc., no matter be after SD analog video signal is decoded, or after high definition analog video signal is decoded, all the signal obtaining after decoding can be converted to the digital signal output of setting form, the digital signal of described setting form can be for adopting the digital signal of YCbCr coded system.
Embodiment bis-,
Below in conjunction with Fig. 3, the flow process of the adaptive signal processing method that the step 101 ~ step 103 in embodiment mono-is provided is elaborated.
This flow process comprises: receive analog video signal, the frequency of the chrominance carrier in the analog video signal receiving is detected, by the detection to the frequency of chrominance carrier, determine the type of this analog video signal:
Determine when this analog video signal is the CVBS of 720H form or the CVBS of 960H form, can utilize the low pass filter that cut-off frequency is 8MHz to carry out filtering to this analog video signal, and can utilize clock that sample frequency is 27MHz as synchronized sampling clock, by SD analog video signal decoding process, the analog video signal after is after filtering decoded, the digital signal that then signal obtaining after decoding is converted to employing YCbCr coded system is exported.
Determine when this analog video signal is 1280H format HD analog video signal, can utilize the low pass filter that cut-off frequency is 20MHz to carry out filtering to this analog video signal, and can utilize clock that sample frequency is 54MHz as synchronized sampling clock, by high definition analog video signal decoding process, the analog video signal after is after filtering decoded, the digital signal that then signal obtaining after decoding is converted to employing YCbCr coded system is exported.
Based on same inventive concept, provide following device with the embodiment of the present invention one and embodiment bis-.
Embodiment tri-,
The embodiment of the present invention three provides a kind of Adaptive Signal Processing device, and this device can be integrated in analog video decoder device, this device can be interpreted as to analog video decoder chip, and the structure of this device can as shown in Figure 4, comprise:
Recognition unit 11, for determining the frequency of the analog video signal chrominance carrier receiving, is determined the type of the analog video signal receiving according to the frequency of chrominance carrier; Decoding unit 12 is determined decoding process corresponding to the type for the decoding process from preserving in advance, utilizes the decoding process of determining to decode to described analog video signal.
Recognition unit 11 is specifically for when definite described frequency is the first setpoint frequency, determine that the analog video signal receiving is SD analog video signal, or, when definite described frequency is the second setpoint frequency, determine that the analog video signal receiving is high definition analog video signal.
Described recognition unit 11 is specifically for locking the colourity negative carrier signal in colour burst region in every a line analog video signal, the reference frequency arranging of take is reference, the frequency of this signal and reference frequency are contrasted, determine whether the frequency of this signal is the first setpoint frequency or the second setpoint frequency.
Described device also comprises the first filter unit 13, for recognition unit, determine that the analog video signal receive is after SD analog video signal, before decoding unit is decoded to analog video signal, utilizing cut-off frequency is that the low pass filter of the first cut-off frequency carries out filtering to analog video signal;
Decoding unit 12 is specifically for determining decoding process corresponding to SD analog video signal the decoding process from preserving in advance, utilize sample frequency be the clock of the first sample frequency as synchronized sampling clock, by the decoding process of determining, the analog video signal after the first filtering unit filters is decoded.
Described device also comprises the second filter unit 14, for recognition unit, determine that the analog video signal receive is after high definition analog video signal, before decoding unit is decoded to analog video signal, utilizing cut-off frequency is that the low pass filter of the second cut-off frequency carries out filtering to analog video signal;
Decoding unit 12 is specifically for determining decoding process corresponding to high definition analog video signal the decoding process from preserving in advance, utilize sample frequency be the clock of the second sample frequency as synchronized sampling clock, by the decoding process of determining, the analog video signal after the second filtering unit filters is decoded.
Decoding unit 12 is also for being converted to the signal obtaining after decoding the digital signal output that adopts YCbCr coded system.
The scheme providing according to the embodiment of the present invention one ~ embodiment tri-, can be by the mode with reference frequency contrast, determine that the frequency of chrominance carrier in the analog video signal receiving meets the frequency feature of chrominance carrier in high definition analog video signal, still meet the frequency feature of chrominance carrier in SD analog video signal, thereby can identify the type of the analog video signal receiving.And can be after determining the type of the analog video signal receiving, according to the type of analog video signal, this analog video signal is decoded, make not only to support the decoding to SD analog video signal, also support the decoding to high definition analog video signal.Further, after analog video signal is decoded, can also, according to the form of setting by the signal output obtaining after decoding, be convenient to follow-up signal and process.
Those skilled in the art should understand, the application's embodiment can be provided as method, system or computer program.Therefore, the application can adopt complete hardware implementation example, implement software example or in conjunction with the form of the embodiment of software and hardware aspect completely.And the application can adopt the form that wherein includes the upper computer program of implementing of computer-usable storage medium (including but not limited to magnetic disc store, CD-ROM, optical memory etc.) of computer usable program code one or more.
The application is with reference to describing according to flow chart and/or the block diagram of the method for the embodiment of the present application, equipment (system) and computer program.Should understand can be in computer program instructions realization flow figure and/or block diagram each flow process and/or the flow process in square frame and flow chart and/or block diagram and/or the combination of square frame.Can provide these computer program instructions to the processor of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing device to produce a machine, the instruction of carrying out by the processor of computer or other programmable data processing device is produced for realizing the device in the function of flow process of flow chart or a plurality of flow process and/or square frame of block diagram or a plurality of square frame appointments.
These computer program instructions also can be stored in energy vectoring computer or the computer-readable memory of other programmable data processing device with ad hoc fashion work, the instruction that makes to be stored in this computer-readable memory produces the manufacture that comprises command device, and this command device is realized the function of appointment in flow process of flow chart or a plurality of flow process and/or square frame of block diagram or a plurality of square frame.
These computer program instructions also can be loaded in computer or other programmable data processing device, make to carry out sequence of operations step to produce computer implemented processing on computer or other programmable devices, thereby the instruction of carrying out is provided for realizing the step of the function of appointment in flow process of flow chart or a plurality of flow process and/or square frame of block diagram or a plurality of square frame on computer or other programmable devices.
Although described the application's preferred embodiment, once those skilled in the art obtain the basic creative concept of cicada, can make other change and modification to these embodiment.So claims are intended to all changes and the modification that are interpreted as comprising preferred embodiment and fall into the application's scope.
Obviously, those skilled in the art can carry out various changes and modification and the spirit and scope that do not depart from the application to the application.Like this, if within these of the application are revised and modification belongs to the scope of the application's claim and equivalent technologies thereof, the application is also intended to comprise these changes and modification interior.
Claims (15)
1. an adaptive signal processing method, is characterized in that, described method comprises:
Determine the frequency of chrominance carrier in the analog video signal receiving;
According to the frequency of chrominance carrier, determine the type of the analog video signal receiving;
From the decoding process of preserving in advance, determine decoding process corresponding to the type, utilize the decoding process of determining to decode to described analog video signal;
The frequency of determining chrominance carrier in the analog video signal receiving, specifically comprises:
Lock the chrominance subcarrier signal in colour burst region in every a line analog video signal;
The reference frequency arranging of take is reference, and the frequency of this signal and reference frequency are contrasted, and determines whether the frequency of this signal is the first setpoint frequency or the second setpoint frequency;
The type of determining the analog video signal receiving according to the frequency of chrominance carrier, specifically comprises:
When definite described frequency is the first setpoint frequency, determine that the analog video signal receiving is SD analog video signal, or, when definite described frequency is the second setpoint frequency, determine that the analog video signal receiving is high definition analog video signal.
2. the method for claim 1, is characterized in that, described the first setpoint frequency is 4.43MHz or 3.58MHz, and described the second setpoint frequency is 18MHz.
3. the method for stating as claim 1, is characterized in that, described the first setpoint frequency is 4.43MHz or 3.58MHz, and described the second setpoint frequency is 36MHz.
4. the method for claim 1, is characterized in that, determines that the analog video signal receive is after SD analog video signal, and before analog video signal is decoded, described method also comprises:
Utilizing cut-off frequency is that the low pass filter of the first cut-off frequency carries out filtering to analog video signal;
From the decoding process of preserving in advance, determine decoding process corresponding to the type, specifically comprise:
From the decoding process of preserving in advance, determine decoding process corresponding to SD analog video signal;
The decoding process that utilization is determined is decoded to described analog video signal, specifically comprises:
Utilize sample frequency be the clock of the first sample frequency as synchronized sampling clock, by the decoding process of determining, the analog video signal after is after filtering decoded.
5. method as claimed in claim 4, is characterized in that, described the first cut-off frequency is 8MHz, described the first sample frequency 27MHz.
6. the method as described in claim 4 or 5, is characterized in that, after analog video signal is decoded, described method also comprises:
The signal obtaining after decoding is converted to the digital signal output that adopts YCbCr coded system.
7. the method for claim 1, is characterized in that, determines that the analog video signal receive is after high definition analog video signal, and before analog video signal is decoded, described method also comprises:
Utilizing cut-off frequency is that the low pass filter of the second cut-off frequency carries out filtering to analog video signal;
From the decoding process of preserving in advance, determine decoding process corresponding to the type, specifically comprise:
From the decoding process of preserving in advance, determine decoding process corresponding to high definition analog video signal;
The decoding process that utilization is determined is decoded to described analog video signal, specifically comprises:
Utilize sample frequency be the clock of the second sample frequency as synchronized sampling clock, by the decoding process of determining, the analog video signal after is after filtering decoded.
8. method as claimed in claim 7, is characterized in that, described the second cut-off frequency is 20MHz, described the second sample frequency 54MHz.
9. method as claimed in claim 7, is characterized in that, described the second cut-off frequency is 40MHz～50MHz, and described the second sample frequency is not less than 100MHz.
10. the method as described in as arbitrary in claim 7～9, is characterized in that, after analog video signal is decoded, described method also comprises:
The signal obtaining after decoding is converted to the digital signal output that adopts YCbCr coded system.
11. 1 kinds of Adaptive Signal Processing devices, is characterized in that, described device comprises:
Recognition unit, for determining the frequency of the analog video signal chrominance carrier receiving, determines the type of the analog video signal receiving according to the frequency of chrominance carrier;
Decoding unit, determines decoding process corresponding to the type for the decoding process from preserving in advance, utilizes the decoding process of determining to decode to described analog video signal;
Described recognition unit, specifically for locking the chrominance subcarrier signal in colour burst region in every a line analog video signal, the reference frequency arranging of take is reference, the frequency of this signal and reference frequency are contrasted, determine whether the frequency of this signal is the first setpoint frequency or the second setpoint frequency;
Recognition unit, specifically for when definite described frequency is the first setpoint frequency, determine that the analog video signal receiving is SD analog video signal, or, when definite described frequency is the second setpoint frequency, determine that the analog video signal receiving is high definition analog video signal.
12. devices as claimed in claim 11, it is characterized in that, described device also comprises the first filter unit, for recognition unit, determine that the analog video signal receive is after SD analog video signal, before decoding unit is decoded to analog video signal, utilizing cut-off frequency is that the low pass filter of the first cut-off frequency carries out filtering to analog video signal;
Decoding unit, specifically for determining decoding process corresponding to SD analog video signal the decoding process from preserving in advance, utilize sample frequency be the clock of the first sample frequency as synchronized sampling clock, by the decoding process of determining, the analog video signal after the first filtering unit filters is decoded.
13. devices as claimed in claim 11, it is characterized in that, described device also comprises the second filter unit, for recognition unit, determine that the analog video signal receive is after high definition analog video signal, before decoding unit is decoded to analog video signal, utilizing cut-off frequency is that the low pass filter of the second cut-off frequency carries out filtering to analog video signal;
Decoding unit, specifically for determining decoding process corresponding to high definition analog video signal the decoding process from preserving in advance, utilize sample frequency be the clock of the second sample frequency as synchronized sampling clock, by the decoding process of determining, the analog video signal after the second filtering unit filters is decoded.
14. devices as described in claim 12 or 13, is characterized in that, decoding unit is also exported for the signal obtaining after decoding being converted to the digital signal of employing YCbCr coded system.
15. 1 kinds of analog video decoder devices, is characterized in that, described decoder comprises the device as described in as arbitrary in claim 11～14.
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| CN107094239A (en) * | 2017-04-24 | 2017-08-25 | 浙江大华技术股份有限公司 | A kind of method and apparatus for determining video format information |
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| CN104461972B (en) * | 2013-09-12 | 2018-03-13 | 华为技术有限公司 | A kind of method and apparatus of data signal samples |
| CN108600444A (en) * | 2018-04-16 | 2018-09-28 | 李苏平 | The method and multipath system of mobile terminal playing multipath audio signal based on input source material |
| CN111082807B (en) * | 2018-10-18 | 2023-05-02 | 杭州海康威视数字技术股份有限公司 | Analog signal processing method and device |
| CN110048981B (en) * | 2019-03-19 | 2020-06-02 | 高拓讯达（北京）科技有限公司 | Frame synchronization method and device for receiver |
| CN115529456A (en) * | 2022-09-28 | 2022-12-27 | 同致电子科技（厦门）有限公司 | Method for detecting color subcarrier frequency |
| CN115391601B (en) * | 2022-10-28 | 2023-03-24 | 摩尔线程智能科技(北京)有限责任公司 | Video format detection method, index model construction method and device |
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| BRPI0608994A2 (en) * | 2005-04-15 | 2010-01-12 | Thomson Licensing | high definition and simple definition digital television decoder |
| KR101183601B1 (en) * | 2007-07-25 | 2012-09-18 | 삼성전자주식회사 | The method of determining picture rate and the image thereof |
| CN101783946A (en) * | 2010-01-30 | 2010-07-21 | 青岛海信网络科技股份有限公司 | Video decoding method, video decoder and video monitoring system |
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