Recording live audio through a microphone using the Torpedo

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Last Post 01 Nov 2013 10:26 AM by steven.eckhoff

Recording live audio through a microphone using the Torpedo internal codec

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steven.eckhoff

Basic Member
Posts:192

29 Oct 2013 10:02 AM
Dear LogicPD support team, we are recording live audio through a microphone using the Torpedo internal codec. The microphone is connected to the MIC_IN (J31.24) pin ( see image: https://db.tt/uztzNrhQ ). The recording has been made with the following command: # alsa_arecord -d 10 -f S16_LE -r 44100 filename.wav There is a constant background electrical noise in the recordings. We have recorded two samples: 1) with microphone plugged: https://db.tt/GIbPiw9a 2) without microphone: https://db.tt/peI6ZPbJ The noise is present in both the recordings. Do you have any suggestions on how to solve this problem?

steven.eckhoff

Basic Member
Posts:192

01 Nov 2013 10:26 AM
Hello, 1. Have you checked the bias on the mic input? 2. From your picture it looks like the microphone is powered; is that correct?

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Forums Texas Instruments SOMs and Development Kits OMAP35x, DM3730, AM3703 Torpedo SOM Development Kit