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authorcashmere <cashmere@autistici.org>2026-09-04 09:05:24 +0200
committercashmere <cashmere@autistici.org>2026-09-04 09:05:24 +0200
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+The `[0-9a-f].wav` files in this directory contain a human voice
+speaking each of the 16 hexadecimal digits. If a captcha string
+consists of just hexadecimal digits (as is the case for captchas
+generated by the [captcha.c module](/finfo/src/captcha.c)) then these WAV
+files can be concatenated together to generate an audio reading of the
+captcha, which enables visually impaired users to complete the
+captcha.
+
+Each of the WAV files uses 8000 samples per second, 8 bits per sample
+and are 6000 samples in length.
+
+The recordings are made by Philip Bennefall and are of his own voice.
+Mr. Bennefall is himself blind and uses this system implemented with these
+recordings to complete captchas for Fossil.