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It's in the Sound
Week 17
You receive the following audio file from an unknown source which you can click to download
Can you decode the message? A reminder, if you are completely stuck, hints will be released after 24 hours :)
Hints
Hints will be released at the start of each of the following days - e.g. the start of day 3 is 48 hours after the challenge starts
| Release Day | Hint |
|---|---|
| 2 | Opening the file in a program like Audacity or online audio editor/waveform visualiser will help |
| 3 | Notice how long the amplitude stays the same before changing - researching the wav format's header/file structure might also help |
| 4 | The first 44 bytes of a wav file are the header - inspecting this, you can see this file uses a sampling frequency of 44,100Hz, a bit depth of 8 and a single audio channel |
| 5 | Since the amplitude remains constant for 0.1 seconds, you can figure out you need to move 4410 bytes (sampling rate * bytes per sample * duration of unchanged amplitude = 44100 * 1 * 0.1) to go from the start of one value to the start of the next |
| 6 | You should notice a lot of the values seem to be in the range 97-122 and 65-90 - i.e. ASCII lowercase and uppercase letters respectively |
| 7 | If you convert the amplitude every 0.1 seconds to its ASCII value and concatenate all the characters together, you will get the answer :) |