Comments by "Mikko Rantalainen" (@MikkoRantalainen) on "WHY don't we upload BLACK BOXES to the cloud?" video.

  1. You could also continously send cockpit voice recorder audio compressed with speex which should be able to transmit understandable human voice using just 700 bps or 88 bytes per second. Multiply that by 4 audio channels and cockipit audio recorder audio would take 1.3 MB per hour for 4 channels! And you could transmit just one sample per second for each 88 data channels which would result in about 1.3 MB per hour (assuming 4 byte sample per channel which is enough for 32 bit integer or 32 bit floating point number), too. So instead of transmitting 20 GB/h you could transmit less than 3 MB/h and still have 4 channels of audio recording and 88 data channels with one sample per second. That's obviously not as good as the real black box data but transmitting 3 MB/h shouldn't be too hard and having heavily compressed audio and one sample per data channel should be plenty if alternative is no black box data at all in some rare cases. I'd assume that transmitting about 200 bytes per second wouldn't be too hard using the existing radio systems.
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