Need to get travel time of each echo

Hi,
I want to calculate the travel time of an echo.
The data I have, is a triggered pulse and 4 echoes in a single graph at different time intervals.
Now, I want to calculate the travel time of each echo from triggered pulse start.
Method I want to use,
1. Calculate first trigger point.
2. Get the end of waveform and gate the data.
3. Again repeat step 1 and 2 , to get first trigger point.
Is there any way to calculate the point where waveform ends or is almost constant?
Or, is there any other method to calculate travel times.
I am new to LabVIEW.Please help.
Thanks, Amit

Answers to your questions will depend on how you have your acquisition set up.
I general, I would expect that you'd set up the system to wait for a loud noise and then take some finite amount of samples (e,g, 100k samples at 10kHz) that will be sure to capture the echos. In this scenario you will alway get the same number of samples.
You can get the amplitudes of the data by using "get waveform components.vi" or "convert from dynamic data" and then use "threshold 1D array" to find the rising edge of the echo peaks.

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SET @x = @x + 1
END
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LoraJabot wrote:
I'm getting a new ipad and I'll be handing over my ipad 3 to my Hubby. I was wondering if we could both share different IDs in the same account and be able to face time each other from my account. Most of his apps where purchased on my itunes for the ipod he uses from my account. Will I need to make him a separate itunes account?
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CREATE OR REPLACE PROCEDURE Cr_Movie_PRV_HTML(
P_Filename IN varchar2,
p_Id IN mist_physician.mp_phys_Id%TYPE
AS
CURSOR C_mist IS
SELECT mp_name,
mp_update_datetime,
mp_area_code,
mp_phone,
mp_address,
mp_fax
FROM Mist_Physician
WHERE Mp_phys_id = P_Id;
v_mp_name mist_physician.mp_name%type;
v_mp_update_datetime mist_physician.mp_update_datetime%type;
v_mp_areacode mist_physician.mp_area_code%type;
v_phone mist_physician.mp_phone%type;
v_mp_address mist_physician.mp_address%type;
v_mp_fax mist_physician.mp_fax%type;
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V_FileHandle := UTL_FILE.FOPEN('c:\mist_info', P_FileName, 'w');
IF Utl_File.IS_OPEN(V_FileHandle) = FALSE THEN
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utl_file.put_line(V_FileHandle,'#-----------------------------------------');
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mp_area_code,
mp_phone,
mp_address,
mp_fax
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WHEN Utl_File.Invalid_Operation THEN
RAISE_APPLICATION_ERROR(-20002,'Error: Invalid File Operation');
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Syntax is::
UTL_FILE.NEW_LINE(filename, nuber-of-lines)
CREATE OR REPLACE PROCEDURE Cr_Movie_PRV_HTML(
P_Filename IN varchar2,
p_Id IN mist_physician.mp_phys_Id%TYPE
AS
CURSOR C_mist IS
SELECT mp_name,
mp_update_datetime,
mp_area_code,
mp_phone,
mp_address,
mp_fax
FROM Mist_Physician
WHERE Mp_phys_id = P_Id;
v_mp_name mist_physician.mp_name%type;
v_mp_update_datetime mist_physician.mp_update_datetime%type;
v_mp_areacode mist_physician.mp_area_code%type;
v_phone mist_physician.mp_phone%type;
v_mp_address mist_physician.mp_address%type;
v_mp_fax mist_physician.mp_fax%type;
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UTL_FILE.PUTF
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UTL_FILE.NEW_LINE(V_FileHandle, 1)
.(Chang the below all u will get as u required)
'Date'||' : '||Mist_Rec.mp_update_datetime,
'Area Code'||' : '||Mist_Rec.mp_area_code,
'Phone'||' : '||Mist_Rec.mp_phone,
'Address'||' : '||Mist_Rec.mp_address,
'Fax'||' : '||Mist_Rec.mp_fax,
'# Generated on: '||to_char(sysdate, 'Mon DD,
YYYY (Dy) HH:MI:SS AM')),
'<img src=c:/our_website/co16.jpeg>'),
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--src=c:/our_website/co16.jpeg>');
END LOOP;
SELECT mp_name,
mp_update_datetime,
mp_area_code,
mp_phone,
mp_address,
mp_fax
INTO v_mp_name,
v_mp_update_datetime,
v_mp_areacode,
v_phone,
v_mp_address,
v_mp_fax
FROM Mist_Physician
WHERE Mp_phys_id = P_Id;
END;
-- Now Close the file
UTL_FILE.FCLOSE( V_FileHandle);
EXCEPTION
WHEN Utl_File.Invalid_Path THEN
RAISE_APPLICATION_ERROR(-20001,'Error: Invalid Path');
WHEN Utl_File.Invalid_Operation THEN
RAISE_APPLICATION_ERROR(-20002,'Error: Invalid File Operation');
IF Utl_File.IS_OPEN(V_FileHandle) = TRUE THEN
Utl_File.FCLOSE(V_FileHandle);
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RAISE_APPLICATION_ERROR(-20003,'Error: Invalid Mode');
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DBMS_OUTPUT.PUT_LINE('ERROR: ' || SQLCODE || '-'||SQLERRM);
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