Changes between Version 14 and Version 15 of Help/AudioMapping
- Timestamp:
- 2010-07-28T17:16:00+02:00 (15 years ago)
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Help/AudioMapping
v14 v15 4 4 One way of surveying is to record notes about street names and points of interest on a dictaphone or other voice recorder while using a GPS receiver to accurately note the position. You can, of course, simply play back your recording through the sound recorder and relate it to your GPS track manually in some way. However, if you have a digital voice recorder which can upload audio files to your computer, JOSM provides facilities to automate this process. 5 5 6 There are threeautomated techniques you can use. Click on the headlines for more detail. See also [wiki:/Help/AudioMapping/Synchronization how to synchronize] your sound track with your GPS track.6 There are four automated techniques you can use. Click on the headlines for more detail. See also [wiki:/Help/AudioMapping/Synchronization how to synchronize] your sound track with your GPS track. Don't forget to set the option for the method you want to use. 7 7 8 8 == A note about calibration == … … 32 32 Disadvantages: unless you are very methodical it can be time consuming to find each bit of audio description, or to be sure you played them all; it relies on the accuracy of your voice recorder's clock; you need to be moving when you make your synchronization cue. 33 33 34 == [wiki:/Help/AudioMapping/SeparateClips 3. Audio clips with waymarks] == 34 == [wiki:/Help/AudioMapping/SeparateClipsByTime 3. Audio clips with file modified time stamps] == 35 36 With [wiki:/Help/AudioMapping/SeparateClipsByTime this method], you make record a separate audio file for each location of interest. Then you import all the files onto your GPX track and it positions an audio marker on the track at the position corresponding to the modified time stamps of the audio files. 37 38 Advantages: doesn't require any waypoints in the GPX; doesn't require large capacity for the audio 39 40 Disadvantages: requires you can get the audio files onto your computer with their time stamps intact; requires you to turn on and off the audio recorder for each clip 41 42 Bug: if the waypoint contains a <time> element, such as the time of recording, JOSM will show an error message "This is after the end of recording" when clicking the Audio Marker. So remove the <time> element or use <cmt> or <desc> instead. 43 44 == [wiki:/Help/AudioMapping/SeparateClips 4. Audio clips with waymarks] == 35 45 36 46 With [wiki:/Help/AudioMapping/SeparateClips this method], you make waypoints to identify locations of interest. However you record a separate audio file for each one and the name of each file is added as a <link> element in the corresponding waypoint in the GPX file before loading into JOSM. When JOSM then creates the Audio Marker for each waypoint, it knows which audio clip to play when you click on the marker. … … 42 52 Bug: if the waypoint contains a <time> element, such as the time of recording, JOSM will show an error message "This is after the end of recording" when clicking the Audio Marker. So remove the <time> element or use <cmt> or <desc> instead. 43 53 54 == 5. Audio clips with sound markers == 55 56 OK, so '''this method doesn't exist'''. But here is what I'd like to achieve if anyone has any sound analysis technology to help: 57 58 Record continuous audio. Say a predefined or trained word or phrase, e.g. "MARK NOTE" to start an audio note. Then process the audio track to locate these special phrases and use the length of time into the recording to place the audio marker relative to the GPX track. 59 60 This doesn't have to be built in to JOSM. WAV files can have labels, which are very simple structures which list name vs time offset into a recording tacked on to the end of a WAV file. So a preprocessor could pass over the WAV file building labels from the determined time offsets and append them to the file. 61 62 Advantages: no buttons to press at all while cycling. 63 44 64 ---- 45 65 Back to [wiki:/Help Main Help]
