CN105118285A - Anti-interference infrared remote-control decoding method and system - Google Patents
Anti-interference infrared remote-control decoding method and system Download PDFInfo
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- 230000008439 repair process Effects 0.000 claims abstract description 47
- 230000000295 complement effect Effects 0.000 claims description 71
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- 238000001514 detection method Methods 0.000 claims description 5
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- G08C23/04—Non-electrical signal transmission systems, e.g. optical systems using light waves, e.g. infrared
Abstract
The invention relates to an anti-interference infrared remote-control decoding method and system. In existing infrared remote-control decoding methods, the problem of resisting outside interference is seldom taken into consideration generally; current infrared remote-control decoding is generally instant decoding, in other words, instant decoding is performed when each pulse reaches, and this mode is difficult for interference resisting and error correction; error correction can be performed only when previous and later pulses are compared, so that decoding is low in anti-interference performance. The method includes that effective infrared remote-control data pulse sections are cut out from a pulse sequence containing infrared remote-control data and repaired to obtain decoded data, and then decoding is performed. In the method, influence of outside interference is taken into consideration, and a data repair algorithm is used to repair the infrared remote-control data, the infrared remote-control data which are interfered can be correctly repaired and decoded with high probability.
Description
Technical field
The present invention relates to Infrared Ray Remote Control Technology field, particularly relate to the method and system of anti-interference infrared remote control decoding.
Background technology
Current, in infrared remote control product, infrared remote control is easy to be subject to extraneous interference, mainly from the Infrared jamming of infrared touch frame.Scheme of the prior art can not carry out identification and error correction to Infrared jamming well, causes infrared remote control to be correctly decoded when there being Infrared jamming.
Present infrared remote control decoding method, the problem of the anti-external interference of general less consideration, and infrared remote control decoding is generally instantaneous decoding at present, namely instantaneous decoding when each pulse arrives, this kind of mode is difficult to anti-interference error-correcting, because error correction needs just can be carried out by front and back pulse contrast, so cause decoding interference free performance poor, portioned product is also had to adopt the mode of edge triggered interruption to decode in addition, all can trigger at rising edge and negative edge, data volume is very large in case of interferers, data are too complicated, cause anti-interference process complicated, poor-performing.
Summary of the invention
Based on this, be necessary the problem being vulnerable to interference for infrared remote control, a kind of method and system of anti-interference infrared remote control decoding is provided.
A method for anti-interference infrared remote control decoding, comprises the following steps:
Obtain the pulse train comprising infrared remote control data, wherein, described pulse train comprises identification pulse and valid data pulse burst, and described valid data pulse burst is after described identification pulse;
Detect the described identification pulse in described pulse train, intercept the described valid data pulse burst after described identification pulse;
The data of described valid data pulse burst are repaired, obtains decoded data;
Described decoded data is decoded.
A system for anti-interference infrared remote control decoding, comprises with lower unit:
Acquiring unit, for obtaining the pulse train comprising infrared remote control data, wherein, described pulse train comprises identification pulse and valid data pulse burst, and described valid data pulse burst is after described identification pulse;
Interception unit, for detecting the described identification pulse in described pulse train, and intercepts the described valid data pulse burst after described identification pulse;
Repairing unit, for repairing the data of described valid data pulse burst, obtaining decoded data;
Decoding unit, for decoding to described decoded data.
According to the scheme of the invention described above, it is in the pulse train comprising infrared remote control data, intercept effective infrared remote control data pulse section, and repair process is carried out to it, decode again after obtaining decoded data, the impact of external interference is considered in the present invention program, and usage data restore design is repaired infrared remote control data, disturbed infrared remote control data can be made correctly to be repaired with greater probability and decode.
Accompanying drawing explanation
Fig. 1 is the process flow diagram of the method for anti-interference infrared remote control decoding in one of them embodiment;
Fig. 2 is the process flow diagram detecting identification pulse in one of them embodiment;
Fig. 3 is the process flow diagram of the valid data pulse burst after intercepting identification pulse in one of them embodiment;
Fig. 4 is the schematic diagram of duplication code pulse in one of them embodiment;
Fig. 5 is the schematic diagram comprising duplication code sequence in one of them embodiment in pulse train;
Fig. 6 is the schematic diagram of logical one and logical zero pulse in one of them embodiment;
Fig. 7 is the schematic diagram of identification pulse and valid data pulse in one of them embodiment;
Fig. 8 is the schematic diagram of the system of anti-interference infrared remote control decoding in one of them embodiment;
Fig. 9 is the partial schematic diagram of the system of anti-interference infrared remote control decoding in one of them embodiment;
Figure 10 is the partial schematic diagram of the system of anti-interference infrared remote control decoding in one of them embodiment;
Figure 11 is the schematic diagram of the system of anti-interference infrared remote control decoding in one of them embodiment.
Embodiment
For making object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is described in further detail.Should be appreciated that embodiment described herein only in order to explain the present invention, do not limit protection scope of the present invention.
Shown in Figure 1, be the embodiment of the method for anti-interference infrared remote control decoding of the present invention.The method of the anti-interference infrared remote control decoding in this embodiment comprises the steps:
Step S101: obtain the pulse train comprising infrared remote control data, wherein, described pulse train comprises identification pulse and valid data pulse burst, and described valid data pulse burst is after described identification pulse;
Step S102: detect the described identification pulse in described pulse train, intercepts the described valid data pulse burst after described identification pulse;
In the present embodiment, valid data pulse burst is closelyed follow after identification pulse, between the two without other pulses.
Step S103: repair the data of described valid data pulse burst, obtains decoded data;
In the present embodiment, in described valid data pulse burst, comprise valid data and interfering data, utilize data restore algorithm to repair interfering data, make the data of valid data pulse burst become the decoded data that can be correctly decoded.
Step S104: described decoded data is decoded.
The method of the anti-interference infrared remote control decoding described in present embodiment, in the pulse train comprising infrared remote control data, intercept effective infrared remote control data pulse section, and repair process is carried out to it, decode again after obtaining decoded data, the impact of external interference is considered in the present invention program, and usage data restore design is repaired infrared remote control data, disturbed infrared remote control data can be made correctly to be repaired with greater probability and decode, thus the problem solving existence interference in infrared remote control data and cannot be correctly decoded.
Wherein in an embodiment, described the step that the data of described valid data pulse burst are repaired to be comprised the following steps:
If the data length of described valid data pulse burst is default regular length, then the data of complementary checking algorithm to this valid data pulse burst are utilized to repair; If the data length of described valid data pulse burst is greater than default regular length, then the data of pooled data algorithm to this valid data pulse burst are utilized to repair; If the data length of described valid data pulse burst is less than default regular length, then the data of Data Division algorithm to this valid data pulse burst are utilized to repair;
Or comprehensive described complementary checking algorithm, described pooled data algorithm, the data of these three kinds of algorithms of described Data Division algorithm to described valid data pulse burst of using are repaired.
In the present embodiment, mainly these three kinds of algorithms of complementary checking algorithm, pooled data algorithm, Data Division algorithm are used to repair respectively to the three types of data length, in actual applications, comprehensively use this three kinds of algorithms often, data so can be made to be repaired preferably.
Preferably, the data of infrared remote control valid data pulse burst comprise address code and command code, they have fixing length, when being interfered, the length of data may be constant, be still regular length, but wherein wrong data, now need to adopt the data of complementary checking algorithm to valid data pulse burst to repair;
When being interfered, the length of data may be longer than regular length, has the disturbed cutting of data in former correct data, now needs to adopt the data of pooled data algorithm to valid data pulse burst to repair;
When being interfered, the length of data may be shorter than regular length, has that data are disturbed to be incorporated in former correct data, now needs to adopt the data of Data Division algorithm to valid data pulse burst to repair;
A lot of disturbed condition is the mixing of above-mentioned three kinds in addition, therefore needs the comprehensive data of these three kinds of algorithms to valid data pulse burst that use repair.
Wherein in an embodiment, the data of valid data pulse burst are the burst length, and data comprise code and radix-minus-one complement, in undisturbed situation, and code and radix-minus-one complement one_to_one corresponding;
The step utilizing the data of complementary checking algorithm to this valid data pulse burst to repair comprises the following steps:
Whether the data detecting described valid data pulse burst are within the scope of the valid interval in the burst length of logical one or logical zero;
If code is not within the scope of the valid interval in the burst length of logical one or logical zero in the data of described valid data pulse burst, then according to the one-to-one relationship of described code and radix-minus-one complement, utilize the radix-minus-one complement that the code not within the scope of the valid interval in the burst length of logical one or logical zero is corresponding, this code is repaired.
In the present embodiment, use complementary checking algorithm can repair length preferably normally, but the data that numerical value is disturbed.
Preferably, according to NEC agreement, correct address code and command code are altogether 32 bits.0 to 7 is address code code, 8th to the 15th is address code radix-minus-one complement, 16th to the 23rd is command code code, 24th to the 31st is command code radix-minus-one complement, code and radix-minus-one complement one_to_one corresponding, code and radix-minus-one complement are logical zero or logical one, and the burst length of logical zero should be 1120us, and the burst length of logical one should be 2250us;
Data in table 1 are the burst length sequences adopting MCU timer to calculate, unit is 10us, because of the error problem of timer, it is 103 that logical zero records normal value, i.e. 1030us (103 × 10us=1030us), logical one is 205, i.e. 2050us (205 × 10us=2050us), timer error is fixing systematic error, does not affect normal logic and judges.Setting fault-tolerant is 100us, then logical zero identification range is 93 ~ 113 (Logic0_Min=93, Logic0_Max=113), and logical one identification range is 195 ~ 215 (Logic1_Min=195, Logic1_Max=215);
When detecting that a certain position is wrong, as in table 1,5th 175 in Logic1 identification range (195 ~ 215), 6th 133 in Logic0 identification range (93 ~ 113), the 13rd just can be utilized to be 103 be identified as Logic0, therefore to know that the 5th should be identified as Logic1 from radix-minus-one complement; In like manner from the 14th, the 6th can be repaired and should be identified as Logic0.
Table 1
Wherein in an embodiment, the data of valid data pulse burst are the burst length;
The step utilizing the data of pooled data algorithm to this valid data pulse burst to repair comprises the following steps:
Whether the data detecting described valid data pulse burst are within the scope of the valid interval in the burst length of logical one or logical zero;
If there are the adjacent data not within the scope of the valid interval in the burst length of logical one or logical zero, then this kind of adjacent data are carried out merging treatment;
If the data of described valid data pulse burst are all within the scope of the valid interval in the burst length of logical one or logical zero, then in described valid data pulse burst all adjacent two be that the data in the burst length of logical zero carry out merging treatment respectively, and with described complementary checking algorithm checking, select the merging treatment wherein meeting checking.
In the present embodiment, use pooled data algorithm to repair preferably and be disturbed rear length data bigger than normal.
Preferably, according to NEC agreement, when data length is greater than 32, illustrates that data are disturbed and split.Data after fractionation generally have two kinds of situations, one by the data after splitting all not in Logic0 and Logic1 scope, adjacent fractionation data directly merge by this kind of situation, as in table 2,206 disturbed data cuttings are 130 and 76, then direct 130 and 76 these two adjacent data to be merged, obtain 206 these correct data; To be Logic1 data just can be identified as two Logic0 data after splitting to another kind, this kind of situation need be verified respectively and merge the situation that former and later two data all are Logic0, and in conjunction with complementary checking algorithm, select the one group of data meeting complementary verification correctly to merge.
Table 2
Wherein in an embodiment, the data of valid data pulse burst are the burst length;
The step utilizing the data of Data Division algorithm to this valid data pulse burst to repair comprises the following steps:
Whether the data detecting described valid data pulse burst are within the scope of the valid interval in the burst length of logical one and logical zero;
If there are data to be the burst length sum of logical one and logical zero, then this Data Division is become the burst length of logical one and logical zero, and the tandem in the burst length of the logical one after splitting and logical zero is verified with described complementary checking algorithm, select the tandem wherein meeting checking;
If there are data to be the burst length sum of logical one and logical one, then this Data Division is become the burst length of two logical ones;
If the data of described valid data pulse burst are all within the scope of the valid interval in the burst length of logical one or logical zero, then in valid data pulse burst the data in burst length of promising logical one carry out deconsolidation process respectively, and verify with complementary checking algorithm, select the deconsolidation process wherein meeting checking.
In the present embodiment, use fractionation data algorithm to repair preferably and be disturbed rear length data less than normal.
Preferably, according to NEC agreement, when data length is less than 32, illustrate to have that 2 data are disturbed to be incorporated at least.This kind of situation must see the size that data merge, if one be pooled data equal Logic0 and Logic1 and, directly be divided into Logic0 and Logic1 two data, but separately, the sequencing of Logic0 and Logic1 needs to confirm with complementary checking algorithm, and as in table 3,206 and 103 merge into 309, be divided into Logic0 and Logic1, after determining 309 fractionations by the radix-minus-one complement 103 and 206 of correspondence, Logic1 is front, and Logic0 is rear; If two pooled datas equal Logic1 and Logic1 and, be directly divided into two Logic1 data; If pooled data equals Logic0 and Logic0's and (two Logic0 and equal a Logic1), with regard to needs, fractionation checking is carried out respectively to all Logic1, and select that correct group by complementary checking algorithm and split, other retain original state.
Table 3
Wherein in an embodiment, the step detecting the identification pulse in pulse train comprises the following steps:
Detect the time span of each pulse in described pulse train, if the time span of wherein certain pulse within the scope of the valid interval of the time span of described identification pulse, then judges that this pulse is described identification pulse;
Or,
Calculate the time span sum of several pulses of continuous print in described pulse train, if its length sum value is within the scope of the valid interval of the time span of described identification pulse, then judge that several pulses described are described identification pulse.
In the present embodiment, can effectively without detecting identification pulse with omitting by said method.
Preferably, below all with the citing of conventional NEC agreement (other infrared remote control protocol class seemingly), employing rising edge triggers, identification pulse can be AGCBurst (automatic growth control high level pulse), according to NEC agreement, AGCBurst is 13500us in theory, setting fault-tolerant is 200us, namely detect that pulse time length is in interval A (13300us-13700us, if A_Min=13300us, A_Max=13700us) just think and recognize AGCBurst, need to use buffer queue FIFO_A to identify herein, then according to NEC agreement, the theoretical T.T. length 53920us of address code and command code, setting fault-tolerant is 400us, thereafter the pulse burst comprising address code and command code according to theoretical value and fault-tolerant intercepting puts into buffer queue FIFO_B, give over to follow-up repair process.
Concrete, do not having in noisy situation, AGCBurst is the complete pulse of 13500us length.Through actual data analysis, when AGCBurst is when disturbed, several small-pulse effect can be cut into, but the time span of small-pulse effect is added up and is in interval A (13300us-13700us).Therefore can not only be in interval A to judge recognize AGCBurst by detecting some pulse lengths, but by arranging the buffer queue FIFO_A that a length is N (general disturbed condition N is set to 3), be used for special detection AGCBurst, inside buffer queue, n (1<=n<=N) individual pulse total length is in interval A, then think and recognized AGCBurst.Buffer queue FIFO_A is used to detect the idiographic flow of AGCBurst as shown in Figure 2.
During beginning, carry out initialization to buffer queue FIFO_A, queuing data is wherein 0; When rising edge comes interim, calculate this rising edge and last time rising edge time interval x as original infrared data, make team's head dequeuing data of FIFO_A, x inputs to the tail of the queue of FIFO_A, record the number n of original infrared data simultaneously, calculate tail of the queue n be worth and the S of FIFO_A; If with value S is in the scope of the valid interval A of AGCBurst, then represent that the overall identifiable design of this n pulse is an AGCBurst; If with value S is less than the minimum value A_Min of valid interval A and n is less than N, then continue the follow-up original infrared data of input, AGCBurst is recognized until detect, or, not meet and value S is less than the minimum value A_Min of valid interval A and n is less than this condition of N, illustrate not detect and recognize AGCBurst, reselect original infrared data and identify.
Adopt that rising edge triggers, the mode acquisition pulse data that do not trigger of negative edge, the few half of the data that this mode gathers than edging trigger, makes repair process efficiently convenient.In addition, only when correctly recognizing AGCBurst, valid data pulse burst below could be intercepted, thus enter reparation step.The size of N value is an empirical value, and through analysis and the algorithm debugs of waveform, for general interference, N gets 3 can identify AGCBurst without omission substantially.
Wherein in an embodiment, the step intercepting the valid data pulse burst after identification pulse comprises the following steps:
According to the predetermined time period of described valid data pulse burst, intercept the described valid data pulse burst after described identification pulse.
In the present embodiment, the valid data pulse burst after identification pulse can effectively be intercepted by said method.
Preferably, below all with the citing of conventional NEC agreement (other infrared remote control protocol class seemingly), employing rising edge triggers, identification pulse can be AGCBurst (automatic growth control high level pulse), according to NEC agreement, after AGCBurst being detected, thereafter the pulse burst comprising address code and command code can be buffered in valid data queue FIFO_B, the address code of one frame effective infrared remote control data and the burst length total length of command code are constant, can divide the border comprising address code and command code data accordingly.Theoretical T.T. length of address code and command code pulse is (2250+1120) × 8 × 2=53920us, and setting fault-tolerant is 400us, i.e. interval B (B_Min=53520us, B_Max=54320us).Intercept the idiographic flow of the valid data pulse burst after identification pulse as shown in Figure 3.
During beginning, first detect AGCBurst; After detection recognizes AGCBurst, initialization valid data queue FIFO_B; Pulse burst data after AGCBurst are buffered to one by one in valid data queue FIFO_B, until the data sum in valid data queue FIFO_B is in the scope of the valid interval B of valid data pulse burst, the address code now in valid data and command code have been buffered in valid data queue FIFO_B all.According to NEC agreement, do not having in noisy situation, the number of pulses of address code and command code is 32; When in noisy situation, address code and command code can be offset, cutting or merging, therefore number of pulses n should at about 32, S for calculating pulse train T.T..
After AGCBurst being detected, by one section T.T. length be input to buffer queue FIFO_B in the pulse train (comprising address code, command code, interference) of interval B, then just can carry out having repaired.This step is mainly separated the pulse train comprising activity address code, command code, and such next step just can be repaired more accurately.
Wherein in an embodiment, further comprising the steps of after intercepting the step of the valid data pulse burst after identification pulse:
If more than one duplication code pulse detected after described valid data pulse burst, then after the data in each duplication code pulse being added to the data of described valid data pulse burst.
In the present embodiment, the duplication code produced is processed, prevents the omission of infrared remote control data message.
Preferably, below with the citing of conventional NEC agreement (other infrared remote control protocol class seemingly), after address code and command code being detected, two kinds of situations are had: one is release infrared remote control button, and this kind of situation can not produce duplication code; Two is do not put according to infrared remote control button always, now will produce duplication code.According to NEC agreement, as shown in Figure 4 and Figure 5, the every 110ms of duplication code occurs 1 time, adopt rising edge detection mode, recognize two continuous print pulse length 11250us (9+2.25=11.25ms), 98750us (110-9-2.25=98.75ms) and then represent and recognized duplication code.Identify the situation of duplication code because will consider situation about disturbing, also need by the similar recognition methods of AGCBurst, principle is the same, and the scope just identified etc. are different, are not described in detail in this.Recognize the disposal route after duplication code duplication code is also put into effective data queue FIFO_B, FIFO_B follow-up go out team address code and command code are repaired and decode, run into during decoding have duplication code just to represent the button of decoding above repeats to press.
The various embodiments described above, all for NEC infrared remote control agreement, are described this NEC agreement below:
NEC agreement is according to burst length length decoding.In figure 6, each pulse is the 38KHz carrier wave (about 21 carrier cycles) of 560us length.The logical one burst length is 2.25ms, and the logical zero burst length is 1.12ms.
Fig. 7 is the typical pulse chain of NEC agreement, comprises identification pulse and valid data.First agreement regulation low level sends, situation as shown in Figure 7, and the address code of transmission is " 59 ", and command code is " 16 ".First the information of each transmission be 9msAGC (automatic growth control) high level pulse for adjusting infrared remote receiver gain, is then the low level of 4.5ms, and the entirety of both is exactly above-mentioned AGCBurst; Next be address code and command code.Address code and command code send twice, and what second time sent is radix-minus-one complement (as: radix-minus-one complement of 11110000 is 00001111), for verifying the accuracy of the information of reception.Because every radix-minus-one complement all sending once it, so overall transmitting time is constant (when namely sending at every turn, no matter be 1 or 0, the time sent is all it and its radix-minus-one complement transmitting time summation), therefore AGCBurst and the address code thereafter in a spacer segment and command code can be intercepted by this.This with the means sending radix-minus-one complement checking reliability, this feature will be used when repairing interfering data.
After pressing infrared remote control button, corresponding valid data information can only send once, if pin infrared remote control button always, what send is then take 110ms as the duplication code in cycle, duplication code is made up of the high level of the AGC high level of 9ms and the low level of 2.25ms and a 560us, as shown in Figure 5.In addition, in Figure 5, the burst length of the rising edge of the AGC from the rising edge of the AGCBurst before valid data to duplication code is also 110ms, identical with the cycle of duplication code.
The invention provides a kind of method of anti-interference infrared remote control decoding, effective infrared remote control data pulse section can be intercepted in the pulse train comprising infrared remote control data according to the method, and repair process is carried out to it, decode again after obtaining decoded data, the impact of external interference is considered in the present invention program, and usage data restore design is repaired infrared remote control data, disturbed infrared remote control data can be made correctly to be repaired with greater probability and decode, thus the problem solving existence interference in infrared remote control data and cannot be correctly decoded.
According to the method for above-mentioned anti-interference infrared remote control decoding, the present invention also provides a kind of system of anti-interference infrared remote control decoding, and just the embodiment of the system of anti-interference infrared remote control decoding of the present invention is described in detail below.
Shown in Figure 8, be the embodiment of the system of anti-interference infrared remote control decoding of the present invention.The system of the anti-interference infrared remote control decoding in this embodiment comprises acquiring unit 201, interception unit 202, repairs unit 203, decoding unit 204, wherein:
Acquiring unit 201, obtain the pulse train comprising infrared remote control data, wherein, described pulse train comprises identification pulse and valid data pulse burst, and described valid data pulse burst is after described identification pulse;
Interception unit 202, for detecting the described identification pulse in described pulse train, intercepts the described valid data pulse burst after described identification pulse;
In the present embodiment, valid data pulse burst is closelyed follow after identification pulse, between the two without other pulses.
Repairing unit 203, for repairing the data of described valid data pulse burst, obtaining decoded data;
In the present embodiment, in described valid data pulse burst, comprise valid data and interfering data, utilize data restore algorithm to repair interfering data, make the data of valid data pulse burst become the decoded data that can be correctly decoded.
Decoding unit 204, for decoding to described decoded data.
The system of the anti-interference infrared remote control decoding described in present embodiment, in the pulse train comprising infrared remote control data, intercept effective infrared remote control data pulse section, and repair process is carried out to it, decode again after obtaining decoded data, the impact of external interference is considered in the present invention program, and usage data restore design is repaired infrared remote control data, disturbed infrared remote control data can be made correctly to be repaired with greater probability and decode, thus the problem solving existence interference in infrared remote control data and cannot be correctly decoded.
Wherein in an embodiment, as shown in Figure 9, described reparation unit 203 comprises:
Complementary verification unit 2031, if be default regular length for the data length of described valid data pulse burst, then utilizes the data of complementary checking algorithm to this valid data pulse burst to repair;
Pooled data unit 2032, if be greater than default regular length for the data length of described valid data pulse burst, then utilizes the data of pooled data algorithm to this valid data pulse burst to repair;
Data Division unit 2033, if be less than default regular length for the data length of described valid data pulse burst, then utilizes the data of Data Division algorithm to this valid data pulse burst to repair;
Overall treatment unit 2034, for comprehensively using described complementary verification unit, described pooled data unit, the data of these three kinds of unit of described Data Division unit to described valid data pulse burst are repaired.
In the present embodiment, mainly these three kinds of algorithms of complementary checking algorithm, pooled data algorithm, Data Division algorithm are used to repair respectively to the three types of data length, in actual applications, comprehensively use this three kinds of algorithms often, data so can be made to be repaired preferably.
Preferably, the data of infrared remote control valid data pulse burst comprise address code and command code, they have fixing length, when being interfered, the length of data may be constant, be still regular length, but wherein wrong data, now need to adopt the data of complementary checking algorithm to valid data pulse burst to repair;
When being interfered, the length of data may be longer than regular length, has the disturbed cutting of data in former correct data, now needs to adopt the data of pooled data algorithm to valid data pulse burst to repair;
When being interfered, the length of data may be shorter than regular length, has that data are disturbed to be incorporated in former correct data, now needs to adopt the data of Data Division algorithm to valid data pulse burst to repair;
A lot of disturbed condition is the mixing of above-mentioned three kinds in addition, therefore needs the comprehensive data of these three kinds of algorithms to valid data pulse burst that use repair.
Wherein in an embodiment, the data of valid data pulse burst are the burst length, comprise code and radix-minus-one complement, in undisturbed situation, and described code and radix-minus-one complement one_to_one corresponding;
Complementary verification unit 2031, for detect described valid data pulse burst data whether within the scope of the valid interval in the burst length of logical one or logical zero;
If code is not within the scope of the valid interval in the burst length of logical one or logical zero in the data of described valid data pulse burst, then according to the one-to-one relationship of described code and radix-minus-one complement, utilize the radix-minus-one complement that the code not within the scope of the valid interval in the burst length of logical one or logical zero is corresponding, this code is repaired.
In the present embodiment, use complementary checking algorithm can repair length preferably normally, but the data that numerical value is disturbed.
Preferably, according to NEC agreement, correct address code and command code are altogether 32 bits.0 to 7 is address code code, 8th to the 15th is address code radix-minus-one complement, 16th to the 23rd is command code code, 24th to the 31st is command code radix-minus-one complement, code and radix-minus-one complement one_to_one corresponding, code and radix-minus-one complement are logical zero or logical one, and the burst length of logical zero should be 1120us, and the burst length of logical one should be 2250us;
Data in table 4 are the burst length sequences adopting MCU timer to calculate, unit is 10us, because of the error problem of timer, it is 103 that logical zero records normal value, i.e. 1030us (103 × 10us=1030us), logical one is 205, i.e. 2050us (205 × 10us=2050us), timer error is fixing systematic error, does not affect normal logic and judges.Setting fault-tolerant is 100us, then logical zero identification range is 93 ~ 113 (Logic0_Min=93, Logic0_Max=113), and logical one identification range is 195 ~ 215 (Logic1_Min=195, Logic1_Max=215);
When detecting that a certain position is wrong, as in table 4,5th 175 in Logic1 identification range (195 ~ 215), 6th 133 in Logic0 identification range (93 ~ 113), the 13rd just can be utilized to be 103 be identified as Logic0, therefore to know that the 5th should be identified as Logic1 from radix-minus-one complement; In like manner from the 14th, the 6th can be repaired and should be identified as Logic0.
Table 4
Wherein in an embodiment, the data of valid data pulse burst are the burst length;
Pooled data unit 2032, for detect described valid data pulse burst data whether within the scope of the valid interval in the burst length of logical one or logical zero;
If there are the adjacent data not within the scope of the valid interval in the burst length of logical one or logical zero, then this kind of adjacent data are carried out merging treatment;
If the data of described valid data pulse burst are all within the scope of the valid interval in the burst length of logical one or logical zero, then in described valid data pulse burst all adjacent two be that the data in the burst length of logical zero carry out merging treatment respectively, and with described complementary checking algorithm checking, select the merging treatment wherein meeting checking.
In the present embodiment, use pooled data algorithm to repair preferably and be disturbed rear length data bigger than normal.
Preferably, according to NEC agreement, when data length is greater than 32, illustrates that data are disturbed and split.Data after fractionation generally have two kinds of situations, one by the data after splitting all not in Logic0 and Logic1 scope, adjacent fractionation data directly merge by this kind of situation, as in table 5,206 disturbed data cuttings are 130 and 76, then direct 130 and 76 these two adjacent data to be merged, obtain 206 these correct data; To be Logic1 data just can be identified as two Logic0 data after splitting to another kind, this kind of situation need be verified respectively and merge the situation that former and later two data all are Logic0, and in conjunction with complementary checking algorithm, select the one group of data meeting complementary verification correctly to merge.
Table 5
Wherein in an embodiment, the data of valid data pulse burst are the burst length;
Data Division unit 2033, for detect described valid data pulse burst data whether within the scope of the valid interval in the burst length of logical one and logical zero;
If there are data to be the burst length sum of logical one and logical zero, then this Data Division is become the burst length of logical one and logical zero, and the tandem in the burst length of the logical one after splitting and logical zero is verified with described complementary checking algorithm, select the tandem wherein meeting checking;
If there are data to be the burst length sum of logical one and logical one, then this Data Division is become the burst length of two logical ones;
If the data of described valid data pulse burst are all within the scope of the valid interval in the burst length of logical one or logical zero, then in valid data pulse burst the data in burst length of promising logical one carry out deconsolidation process respectively, and verify with complementary checking algorithm, select the deconsolidation process wherein meeting checking.
In the present embodiment, use fractionation data algorithm to repair preferably and be disturbed rear length data less than normal.
Preferably, according to NEC agreement, when data length is less than 32, illustrate to have that 2 data are disturbed to be incorporated at least.This kind of situation must see the size that data merge, if one be pooled data equal Logic0 and Logic1 and, directly be divided into Logic0 and Logic1 two data, but separately, the sequencing of Logic0 and Logic1 needs to confirm with complementary checking algorithm, and as in table 6,206 and 103 merge into 309, be divided into Logic0 and Logic1, after determining 309 fractionations by the radix-minus-one complement 103 and 206 of correspondence, Logic1 is front, and Logic0 is rear; If two pooled datas equal Logic1 and Logic1 and, be directly divided into two Logic1 data; If pooled data equals Logic0 and Logic0's and (two Logic0 and equal a Logic1), with regard to needs, fractionation checking is carried out respectively to all Logic1, and select that correct group by complementary checking algorithm and split, other retain original state.
Table 6
Wherein in an embodiment, as shown in Figure 10, described interception unit 202 comprises detecting unit 2021;
Described detecting unit 2021, for detecting the time span of each pulse in described pulse train, if the time span of wherein certain pulse within the scope of the valid interval of the time span of described identification pulse, then judges that this pulse is described identification pulse;
Or,
Calculate the time span sum of several pulses of continuous print in described pulse train, if its length sum value is within the scope of the valid interval of the time span of described identification pulse, then judge that several pulses described are described identification pulse.
In the present embodiment, can effectively without detecting identification pulse with omitting by said method.
Preferably, below all with the citing of conventional NEC agreement (other infrared remote control protocol class seemingly), employing rising edge triggers, identification pulse can be AGCBurst (automatic growth control high level pulse), according to NEC agreement, AGCBurst is 13500us in theory, setting fault-tolerant is 200us, namely detect that pulse time length is in interval A (13300us-13700us, if A_Min=13300us, A_Max=13700us) just think and recognize AGCBurst, need to use buffer queue FIFO_A to identify herein, then according to NEC agreement, the theoretical T.T. length 53920us of address code and command code, setting fault-tolerant is 400us, thereafter the pulse burst comprising address code and command code according to theoretical value and fault-tolerant intercepting puts into buffer queue FIFO_B, give over to follow-up repair process.
Concrete, do not having in noisy situation, AGCBurst is the complete pulse of 13500us length.Through actual data analysis, when AGCBurst is when disturbed, several small-pulse effect can be cut into, but the time span of small-pulse effect is added up and is in interval A (13300us-13700us).Therefore can not only be in interval A to judge recognize AGCBurst by detecting some pulse lengths, but by arranging the buffer queue FIFO_A that a length is N (general disturbed condition N is set to 3), be used for special detection AGCBurst, inside buffer queue, n (1<=n<=N) individual pulse total length is in interval A, then think and recognized AGCBurst.Buffer queue FIFO_A is used to detect the idiographic flow of AGCBurst as shown in Figure 2.
During beginning, carry out initialization to buffer queue FIFO_A, queuing data is wherein 0; When rising edge comes interim, calculate this rising edge and last time rising edge time interval x as original infrared data, make team's head dequeuing data of FIFO_A, x inputs to the tail of the queue of FIFO_A, record the number n of original infrared data simultaneously, calculate tail of the queue n be worth and the S of FIFO_A; If with value S is in the scope of the valid interval A of AGCBurst, then represent that the overall identifiable design of this n pulse is an AGCBurst; If with value S is less than the minimum value A_Min of valid interval A and n is less than N, then continue the follow-up original infrared data of input, AGCBurst is recognized until detect, or, not meet and value S is less than the minimum value A_Min of valid interval A and n is less than this condition of N, illustrate not detect and recognize AGCBurst, reselect original infrared data and identify.
Adopt that rising edge triggers, the mode acquisition pulse data that do not trigger of negative edge, the few half of the data that this mode gathers than edging trigger, makes repair process efficiently convenient.In addition, only when correctly recognizing AGCBurst, valid data pulse burst below could be intercepted, thus enter reparation step.The size of N value is an empirical value, and through analysis and the algorithm debugs of waveform, for general interference, N gets 3 can identify AGCBurst without omission substantially.
Wherein in an embodiment, described interception unit 202, for the predetermined time period according to described valid data pulse burst, intercepts the described valid data pulse burst after described identification pulse.
In the present embodiment, the valid data pulse burst after identification pulse can effectively be intercepted by said method.
Preferably, below all with the citing of conventional NEC agreement (other infrared remote control protocol class seemingly), employing rising edge triggers, identification pulse can be AGCBurst (automatic growth control high level pulse), according to NEC agreement, after AGCBurst being detected, thereafter the pulse burst comprising address code and command code can be buffered in valid data queue FIFO_B, the address code of one frame effective infrared remote control data and the burst length total length of command code are constant, can divide the border comprising address code and command code data accordingly.Theoretical T.T. length of address code and command code pulse is (2250+1120) × 8 × 2=53920us, and setting fault-tolerant is 400us, i.e. interval B (B_Min=53520us, B_Max=54320us).Intercept the idiographic flow of the valid data pulse burst after identification pulse as shown in Figure 3.
During beginning, first detect AGCBurst; After detection recognizes AGCBurst, initialization valid data queue FIFO_B; Pulse burst data after AGCBurst are buffered to one by one in valid data queue FIFO_B, until the data sum in valid data queue FIFO_B is in the scope of the valid interval B of valid data pulse burst, the address code now in valid data and command code have been buffered in valid data queue FIFO_B all.According to NEC agreement, do not having in noisy situation, the number of pulses of address code and command code is 32; When in noisy situation, address code and command code can be offset, cutting or merging, therefore number of pulses n should at about 32, S for calculating pulse train T.T..
After AGCBurst being detected, by one section T.T. length be input to buffer queue FIFO_B in the pulse train (comprising address code, command code, interference) of interval B, then just can carry out having repaired.This step is mainly separated the pulse train comprising activity address code, command code, and such next unit just can be repaired more accurately.
Wherein in an embodiment, as shown in figure 11, the system of anti-interference infrared remote control decoding comprises re-treatment unit 205, if for more than one duplication code pulse being detected after described valid data pulse burst, then after the data in each duplication code pulse being added to the data of described valid data pulse burst.
In the present embodiment, the duplication code produced is processed, prevents the omission of infrared remote control data message.
Preferably, below with the citing of conventional NEC agreement (other infrared remote control protocol class seemingly), after address code and command code being detected, two kinds of situations are had: one is release infrared remote control button, and this kind of situation can not produce duplication code; Two is do not put according to infrared remote control button always, now will produce duplication code.According to NEC agreement, as shown in Figure 4 and Figure 5, the every 110ms of duplication code occurs 1 time, adopt rising edge detection mode, recognize two continuous print pulse length 11250us (9+2.25=11.25ms), 98750us (110-9-2.25=98.75ms) and then represent and recognized duplication code.Identify the situation of duplication code because will consider situation about disturbing, also need by the similar recognition methods of AGCBurst, principle is the same, and the scope just identified etc. are different, are not described in detail in this.Recognize the disposal route after duplication code duplication code is also put into effective data queue FIFO_B, FIFO_B follow-up go out team address code and command code are repaired and decode, run into during decoding have duplication code just to represent the button of decoding above repeats to press.
The various embodiments described above, all for NEC infrared remote control agreement, are described this NEC agreement below:
NEC agreement is according to burst length length decoding.In figure 6, each pulse is the 38KHz carrier wave (about 21 carrier cycles) of 560us length.The logical one burst length is 2.25ms, and the logical zero burst length is 1.12ms.
Fig. 7 is the typical pulse chain of NEC agreement.First agreement regulation low level sends, situation as shown in Figure 7, and the address code of transmission is " 59 ", and command code is " 16 ".First the information of each transmission be 9msAGC (automatic growth control) high level pulse for adjusting infrared remote receiver gain, is then the low level of 4.5ms, and the entirety of both is exactly above-mentioned AGCBurst; Next be address code and command code.Address code and command code send twice, and what second time sent is radix-minus-one complement (as: radix-minus-one complement of 11110000 is 00001111), for verifying the accuracy of the information of reception.Because every radix-minus-one complement all sending once it, so overall transmitting time is constant (when namely sending at every turn, no matter be 1 or 0, the time sent is all it and its radix-minus-one complement transmitting time summation), therefore AGCBurst and the address code thereafter in a spacer segment and command code can be intercepted by this.This with the means sending radix-minus-one complement checking reliability, this feature will be used when repairing interfering data.
After pressing infrared remote control button, corresponding valid data information can only send once, if pin infrared remote control button always, what send is then take 110ms as the duplication code in cycle, duplication code is made up of the high level of the AGC high level of 9ms and the low level of 2.25ms and a 560us, as shown in Figure 7.In addition, in the figure 7, the burst length of the rising edge of the AGC from the rising edge of the AGCBurst before valid data to duplication code is also 110ms, identical with the cycle of duplication code.
The system of anti-interference infrared remote control decoding of the present invention and the method one_to_one corresponding of anti-interference infrared remote control decoding of the present invention, the technical characteristic of setting forth in the embodiment of the method for above-mentioned anti-interference infrared remote control decoding and beneficial effect thereof are all applicable in the embodiment of the system of anti-interference infrared remote control decoding.
Each technical characteristic of the above embodiment can combine arbitrarily, for making description succinct, the all possible combination of each technical characteristic in above-described embodiment is not all described, but, as long as the combination of these technical characteristics does not exist contradiction, be all considered to be the scope that this instructions is recorded.
The above embodiment only have expressed several embodiment of the present invention, and it describes comparatively concrete and detailed, but can not therefore be construed as limiting the scope of the patent.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (10)
1. a method for anti-interference infrared remote control decoding, is characterized in that, comprises the following steps:
Obtain the pulse train comprising infrared remote control data, wherein, described pulse train comprises identification pulse and valid data pulse burst, and described valid data pulse burst is after described identification pulse;
Detect the described identification pulse in described pulse train, intercept the described valid data pulse burst after described identification pulse;
The data of described valid data pulse burst are repaired, obtains decoded data;
Described decoded data is decoded.
2. the method for anti-interference infrared remote control decoding according to claim 1, is characterized in that, describedly comprises the following steps the step that the data of described valid data pulse burst are repaired:
If the data length of described valid data pulse burst is default regular length, then the data of complementary checking algorithm to this valid data pulse burst are utilized to repair; If the data length of described valid data pulse burst is greater than default regular length, then the data of pooled data algorithm to this valid data pulse burst are utilized to repair; If the data length of described valid data pulse burst is less than default regular length, then the data of Data Division algorithm to this valid data pulse burst are utilized to repair;
Or comprehensive described complementary checking algorithm, described pooled data algorithm, the data of these three kinds of algorithms of described Data Division algorithm to described valid data pulse burst of using are repaired.
3. the method for anti-interference infrared remote control decoding according to claim 2, is characterized in that,
The data of described valid data pulse burst are the burst length, and described data comprise code and radix-minus-one complement, in undisturbed situation, and described code and radix-minus-one complement one_to_one corresponding;
The step that the data of the complementary checking algorithm of described utilization to this valid data pulse burst are repaired comprises the following steps:
Whether the data detecting described valid data pulse burst are within the scope of the valid interval in the burst length of logical one or logical zero;
If code is not within the scope of the valid interval in the burst length of logical one or logical zero in the data of described valid data pulse burst, then according to the one-to-one relationship of described code and radix-minus-one complement, utilize the radix-minus-one complement that the code not within the scope of the valid interval in the burst length of logical one or logical zero is corresponding, this code is repaired.
4. the method for anti-interference infrared remote control decoding according to claim 2, is characterized in that,
The data of described valid data pulse burst are the burst length;
The described step utilizing the data of pooled data algorithm to this valid data pulse burst to repair comprises the following steps:
Whether the data detecting described valid data pulse burst are within the scope of the valid interval in the burst length of logical one or logical zero;
If there are the adjacent data not within the scope of the valid interval in the burst length of logical one or logical zero, then this kind of adjacent data are carried out merging treatment;
If the data of described valid data pulse burst are all within the scope of the valid interval in the burst length of logical one or logical zero, then in described valid data pulse burst all adjacent two be that the data in the burst length of logical zero carry out merging treatment respectively, and with described complementary checking algorithm checking, select the merging treatment wherein meeting checking.
5. the method for anti-interference infrared remote control decoding according to claim 2, is characterized in that,
The data of described valid data pulse burst are the burst length;
The described step utilizing the data of Data Division algorithm to this valid data pulse burst to repair comprises the following steps:
Whether the data detecting described valid data pulse burst are within the scope of the valid interval in the burst length of logical one and logical zero;
If there are data to be the burst length sum of logical one and logical zero, then this Data Division is become the burst length of logical one and logical zero, and the tandem in the burst length of the logical one after splitting and logical zero is verified with described complementary checking algorithm, select the tandem wherein meeting checking;
If there are data to be the burst length sum of logical one and logical one, then this Data Division is become the burst length of two logical ones;
If the data of described valid data pulse burst are all within the scope of the valid interval in the burst length of logical one or logical zero, then in valid data pulse burst the data in burst length of promising logical one carry out deconsolidation process respectively, and verify with complementary checking algorithm, select the deconsolidation process wherein meeting checking.
6. the method for anti-interference infrared remote control decoding as claimed in any of claims 1 to 5, is characterized in that, the step of the described identification pulse in the described pulse train of described detection comprises the following steps:
Detect the time span of each pulse in described pulse train, if the time span of wherein certain pulse within the scope of the valid interval of the time span of described identification pulse, then judges that this pulse is described identification pulse;
Or,
Calculate the time span sum of several pulses of continuous print in described pulse train, if its length sum value is within the scope of the valid interval of the time span of described identification pulse, then judge that several pulses described are described identification pulse.
7. the method for anti-interference infrared remote control decoding as claimed in any of claims 1 to 5, is characterized in that, the step of the described valid data pulse burst after the described identification pulse of described intercepting comprises the following steps:
According to the predetermined time period of described valid data pulse burst, intercept the described valid data pulse burst after described identification pulse.
8. the method for anti-interference infrared remote control decoding according to claim 7, is characterized in that, further comprising the steps of after the step of the valid data pulse burst after the described identification pulse of described intercepting:
If more than one duplication code pulse detected after described valid data pulse burst, then after the data in each duplication code pulse being added to the data of described valid data pulse burst.
9. a system for anti-interference infrared remote control decoding, is characterized in that, comprises with lower unit:
Acquiring unit, for obtaining the pulse train comprising infrared remote control data, wherein, described pulse train comprises identification pulse and valid data pulse burst, and described valid data pulse burst is after described identification pulse;
Interception unit, for detecting the described identification pulse in described pulse train, intercepts the described valid data pulse burst after described identification pulse;
Repairing unit, for repairing the data of described valid data pulse burst, obtaining decoded data;
Decoding unit, for decoding to described decoded data.
10. the system of anti-interference infrared remote control decoding according to claim 9, is characterized in that, described reparation unit, comprises complementary verification unit, pooled data unit, Data Division unit, overall treatment unit;
Described complementary verification unit, if be default regular length for the data length of described valid data pulse burst, then utilizes the data of complementary checking algorithm to this valid data pulse burst to repair;
Described pooled data unit, if be greater than default regular length for the data length of described valid data pulse burst, then utilizes the data of pooled data algorithm to this valid data pulse burst to repair;
Described Data Division unit, if be less than default regular length for the data length of described valid data pulse burst, then utilizes the data of Data Division algorithm to this valid data pulse burst to repair;
Described overall treatment unit, for comprehensively using described complementary verification unit, described pooled data unit, the data of these three kinds of unit of described Data Division unit to described valid data pulse burst are repaired.
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