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Testing and semi-automatically changing the Sanako student audio configuration
- Problem
- We have had teacher complaints about too much background noise from neighboring students being recorded in our Sanako Study 1200, with SLH-07 headsets.
- In addition, upon looking through some recordings as samples for a workshop, I found cases of clipping audio, especially in pair recordings.
- We are using the default settings for the Sanako SLH-07 headset. However, the default recording level (67) seems high.
- Solution approach
- We need to test
- many other settings quickly for these recording levels. We use my sanakoaudioconfigonthefly utility for this
- in an acoustically realistic environment: 5 Lab assistants site in tight lab area and read out sample English text during a Sanako reading activity
- Reading practice
- Todo: Pairing
- Here is a “window” into the recorded results set, a student’s audio recording shown in Audacity at various (but all lowered) recording levels from (visible) 30 to 5, you can see the diminishing waveform amplitude.
- The waveform per se is not conclusive. You will have to listen in and compare, especially to evaluate background noise (the original complaint – we have no and will not be able to go back to language lab carrels). The Sanako SLH-07 headset microphones are supposed to be highly directional. However, our students to not always wear the headsets properly. And our acoustics is marred by large (almost 50%) window spaces and a tight positioning of the student seats.
- Any test recording is only as good as it can mimic the acoustics during an actual class session which we did as much as we could with only 6 concurrent LRC staff. This means unfortunately some more testing will have to spill into actual classes, but this test is a start.
- We need to test
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