Good application of a filter of 50 Hz
Hello
I need to apply a filter of 50 Hz to an acquisition of signals DAQ (noise for testing).
When I apply the filter, the resulting signal has enormous oscillations in the first part of the signal acquired (as see you in "Filter output.png"), after these oscillations, the signal becomes filtered as it should.
I tried to change the sampling frequency, the frequency of signal acquisition and all other settings, but I can't get rid of these oscillations.
What Miss me?
In "Diagram.png", you see the pattern of the filter.
The signal is acquired at 10 k rates and includes 30 k points.
I have some experience with Labview, but I've never used its filters.
Thanks for the help
Your image resolution is a bit low to be sure, but it seems that you have a significant lag in the data. A mismatch can lead the transient response of the filter. With a filter bandwidth, which can produce an oscillating reaction.
With your entry of noise you get very little energy in the band stop filter so it can be difficult to see the effect. When I simulate your signal with offset of the hard shoulder is almost impossible to detect. The noise in each tray is approximately 60 dB below the offset and the stopband attenuation is about the same. Without the offset the stopband is detectable (visually on a graph) about a quarter of the time. With 300000 samples, it is almost always visible with or without the offset. See the image below.
Usually interpreted restrictively the frequency response of a filter, more transient response.
Lynn
Tags: NI Software
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Here's the bad autotrace:explain plan succeeded. PLAN_TABLE_OUTPUT ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ Plan hash value: 337039962 -------------------------------------------------------------------------------------------------------- | Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time | -------------------------------------------------------------------------------------------------------- | 0 | SELECT STATEMENT | | 1 | 33 | 20 (25)| 00:00:01 | | 1 | SORT AGGREGATE | | 1 | 33 | | | | 2 | NESTED LOOPS | | 1 | 33 | 3 (0)| 00:00:01 | | 3 | NESTED LOOPS | | 1 | 22 | 2 (0)| 00:00:01 | |* 4 | INDEX UNIQUE SCAN | PS_ERN_PROGRAM_DEF | 1 | 12 | 1 (0)| 00:00:01 | | 5 | SORT AGGREGATE | | 1 | 63 | | | | 6 | NESTED LOOPS | | 1 | 63 | 13 (39)| 00:00:01 | | 7 | NESTED LOOPS | | 1 | 52 | 12 (42)| 00:00:01 | |* 8 | HASH JOIN | | 4 | 168 | 12 (42)| 00:00:01 | | 9 | VIEW | VW_SQ_1 | 88 | 2112 | 9 (45)| 00:00:01 | | 10 | SORT GROUP BY | | 88 | 2728 | 9 (45)| 00:00:01 | | 11 | MERGE JOIN | | 3087 | 95697 | 7 (29)| 00:00:01 | | 12 | SORT JOIN | | 643 | 11574 | 2 (0)| 00:00:01 | |* 13 | INDEX RANGE SCAN | PS_ERN_PROGRAM_DEF | 643 | 11574 | 2 (0)| 00:00:01 | |* 14 | SORT JOIN | | 96 | 1248 | 5 (40)| 00:00:01 | |* 15 | INDEX FAST FULL SCAN | PS_EARNINGS_TBL | 96 | 1248 | 4 (25)| 00:00:01 | |* 16 | INDEX RANGE SCAN | PS_ERN_PROGRAM_DEF | 643 | 11574 | 2 (0)| 00:00:01 | |* 17 | INDEX UNIQUE SCAN | PS_EARNINGS_TBL | 1 | 10 | 0 (0)| 00:00:01 | |* 18 | TABLE ACCESS BY INDEX ROWID| PS_ERN_PROGRAM_TBL | 1 | 11 | 1 (0)| 00:00:01 | |* 19 | INDEX UNIQUE SCAN | PS_ERN_PROGRAM_TBL | 1 | | 0 (0)| 00:00:01 | |* 20 | INDEX RANGE SCAN | PS_EARNINGS_TBL | 1 | 10 | 1 (0)| 00:00:01 | | 21 | SORT AGGREGATE | | 1 | 10 | | | |* 22 | INDEX RANGE SCAN | PS_EARNINGS_TBL | 1 | 10 | 2 (0)| 00:00:01 | |* 23 | TABLE ACCESS BY INDEX ROWID | PS_ERN_PROGRAM_TBL | 1 | 11 | 1 (0)| 00:00:01 | |* 24 | INDEX UNIQUE SCAN | PS_ERN_PROGRAM_TBL | 1 | | 0 (0)| 00:00:01 | -------------------------------------------------------------------------------------------------------- Predicate Information (identified by operation id): --------------------------------------------------- 4 - access("A"."ERN_PROGRAM"='VT' AND "A"."EFFDT"= (SELECT MAX("A"."EFFDT") FROM SYSADM."PS_EARNINGS_TBL" "C",SYSADM."PS_ERN_PROGRAM_TBL" "B",SYSADM."PS_ERN_PROGRAM_DEF" "A", (SELECT MAX(SYS_OP_UNDESCEND(SYS_OP_DESCEND("EFFDT"))) "VW_COL_1","D"."ERNCD" "ERNCD",ROWID "ROWID" FROM SYSADM."PS_EARNINGS_TBL" "D","PS_ERN_PROGRAM_DEF" "A" WHERE "A"."EFFDT"<=TO_DATE(:PPE_DATE,'YYYY-MM-DD') AND "A"."ERN_PROGRAM"='VT' AND SYS_OP_UNDESCEND(SYS_OP_DESCEND("EFFDT"))<=INTERNAL_FUNCTION("A"."EFFDT") AND SYS_OP_UNDESCEND(SYS_OP_DESCEND("EFFDT"))<=TO_DATE(:PPE_DATE,'YYYY-MM-DD') GROUP BY "D"."ERNCD",ROWID) "VW_SQ_1" WHERE "ROWID"=ROWID AND "A"."EFFDT"<=TO_DATE(:PPE_DATE,'YYYY-MM-DD') AND "A"."ERN_PROGRAM"='VT' AND "A"."EFFDT"="B"."EFFDT" AND "B"."ERN_PROGRAM"='VT' AND "B"."EFF_STATUS"='A' AND "B"."EFFDT"<=TO_DATE(:PPE_DATE,'YYYY-MM-DD') AND SYS_OP_DESCEND("EFFDT")=SYS_OP_DESCEND("VW_COL_1") AND "ERNCD"="C"."ERNCD" AND "C"."ERNCD"="A"."ERNCD" AND SYS_OP_UNDESCEND(SYS_OP_DESCEND("EFFDT"))="VW_COL_1") AND "A"."ERNCD"=:ERNCD) 8 - access("ROWID"=ROWID) 13 - access("A"."ERN_PROGRAM"='VT' AND "A"."EFFDT"<=TO_DATE(:PPE_DATE,'YYYY-MM-DD')) 14 - access(SYS_OP_UNDESCEND(SYS_OP_DESCEND("EFFDT"))<=INTERNAL_FUNCTION("A"."EFFDT")) filter(SYS_OP_UNDESCEND(SYS_OP_DESCEND("EFFDT"))<=INTERNAL_FUNCTION("A"."EFFDT")) 15 - filter(SYS_OP_UNDESCEND(SYS_OP_DESCEND("EFFDT"))<=TO_DATE(:PPE_DATE,'YYYY-MM-DD')) 16 - access("A"."ERN_PROGRAM"='VT' AND "A"."EFFDT"<=TO_DATE(:PPE_DATE,'YYYY-MM-DD')) 17 - access("ERNCD"="C"."ERNCD" AND SYS_OP_DESCEND("EFFDT")=SYS_OP_DESCEND("VW_COL_1")) filter("C"."ERNCD"="A"."ERNCD" AND SYS_OP_UNDESCEND(SYS_OP_DESCEND("EFFDT"))="VW_COL_1") 18 - filter("B"."EFF_STATUS"='A') 19 - access("B"."ERN_PROGRAM"='VT' AND "A"."EFFDT"="B"."EFFDT") filter("B"."EFFDT"<=TO_DATE(:PPE_DATE,'YYYY-MM-DD')) 20 - access("C"."ERNCD"=:ERNCD) filter(SYS_OP_UNDESCEND(SYS_OP_DESCEND("EFFDT"))= (SELECT MAX(SYS_OP_UNDESCEND(SYS_OP_DESCEND("EFFDT"))) FROM SYSADM."PS_EARNINGS_TBL" "D" WHERE SYS_OP_DESCEND("EFFDT") IS NOT NULL AND SYS_OP_DESCEND("EFFDT")>=SYS_OP_DESCEND(:B1) AND "D"."ERNCD"=:B2 AND SYS_OP_UNDESCEND(SYS_OP_DESCEND("EFFDT"))<=:B3)) 22 - access("D"."ERNCD"=:B1 AND SYS_OP_DESCEND("EFFDT")>=SYS_OP_DESCEND(:B2) AND SYS_OP_DESCEND("EFFDT") IS NOT NULL) filter(SYS_OP_UNDESCEND(SYS_OP_DESCEND("EFFDT"))<=:B1) 23 - filter("B"."EFF_STATUS"='A') 24 - access("B"."ERN_PROGRAM"='VT' AND "A"."EFFDT"="B"."EFFDT")SQL> variable ppe_date varchar2(10) SQL> variable erncd varchar2(3) SQL> exec :ppe_date := '2009-10-10' SQL> exec :erncd := '01' SQL> SELECT COUNT(*) 2 FROM PS_ERN_PROG_DESCR A 3 WHERE A.ERN_PROGRAM = 'VT' 4 AND A.ERNCD = :erncd 5 AND EFFDT = 6 (SELECT MAX(B.EFFDT) 7 FROM PS_ERN_PROG_DESCR B 8 WHERE B.ERN_PROGRAM = 'VT' 9 AND B.EFFDT <= TO_DATE(:ppe_date,'YYYY-MM-DD') 10 ); COUNT(*) ---------- 1 Elapsed: 00:04:07.40 Execution Plan ---------------------------------------------------------- 0 SELECT STATEMENT Optimizer=ALL_ROWS (Cost=20 Card=1 Bytes=33) 1 0 SORT (AGGREGATE) 2 1 NESTED LOOPS (Cost=3 Card=1 Bytes=33) 3 2 NESTED LOOPS (Cost=2 Card=1 Bytes=22) 4 3 INDEX (UNIQUE SCAN) OF 'PS_ERN_PROGRAM_DEF' (INDEX (UNIQUE)) (Cost=1 Card=1 Bytes=12) 5 4 SORT (AGGREGATE) 6 5 NESTED LOOPS (Cost=13 Card=1 Bytes=63) 7 6 NESTED LOOPS (Cost=12 Card=1 Bytes=52) 8 7 HASH JOIN (Cost=12 Card=4 Bytes=168) 9 8 VIEW OF 'VW_SQ_1' (VIEW) (Cost=9 Card=88 Bytes=2112) 10 9 SORT (GROUP BY) (Cost=9 Card=88 Bytes=2728) 11 10 MERGE JOIN (Cost=7 Card=3087 Bytes=95697) 12 11 SORT (JOIN) (Cost=2 Card=643 Bytes=11574) 13 12 INDEX (RANGE SCAN) OF 'PS_ERN_PROGRAM_DEF' (INDEX (UNIQUE)) (Cost=2 Card=643 Bytes=11574) 14 11 SORT (JOIN) (Cost=5 Card=96 Bytes=1248) 15 14 INDEX (FAST FULL SCAN) OF 'PS_EARNINGS_TBL' (INDEX (UNIQUE)) (Cost=4 Card=96 Bytes=1248) 16 8 INDEX (RANGE SCAN) OF 'PS_ERN_PROGRAM_DEF' (INDEX (UNIQUE)) (Cost=2 Card=643 Bytes=11574) 17 7 INDEX (UNIQUE SCAN) OF 'PS_EARNINGS_TBL' (INDEX (UNIQUE)) (Cost=0 Card=1 Bytes=10) 18 6 TABLE ACCESS (BY INDEX ROWID) OF 'PS_ERN_PROGRAM_TBL' (TABLE) (Cost=1 Card=1 Bytes=11) 19 18 INDEX (UNIQUE SCAN) OF 'PS_ERN_PROGRAM_TBL' (INDEX (UNIQUE)) (Cost=0 Card=1) 20 3 INDEX (RANGE SCAN) OF 'PS_EARNINGS_TBL' (INDEX (UNIQUE)) (Cost=1 Card=1 Bytes=10) 21 20 SORT (AGGREGATE) 22 21 INDEX (RANGE SCAN) OF 'PS_EARNINGS_TBL' (INDEX (UNIQUE)) (Cost=2 Card=1 Bytes=10) 23 2 TABLE ACCESS (BY INDEX ROWID) OF 'PS_ERN_PROGRAM_TBL' (TABLE) (Cost=1 Card=1 Bytes=11) 24 23 INDEX (UNIQUE SCAN) OF 'PS_ERN_PROGRAM_TBL' (INDEX (UNIQUE)) (Cost=0 Card=1) Statistics ---------------------------------------------------------- 3820 recursive calls 66 db block gets 4677728 consistent gets 80608 physical reads 0 redo size 232 bytes sent via SQL*Net to client 278 bytes received via SQL*Net from client 2 SQL*Net roundtrips to/from client 2 sorts (memory) 1 sorts (disk) 1 rows processed SQL> spool offI think you have to hit some sort of bug in the optimizer. Do you have the histograms on the EFFDT column.
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