For now, the speed is 4 tones for second, so 2 bytes for second. So I added a command line tool based able to convert a file (binary or text ) in a sequence of DTMF tones There are 16 DTMF tones, so you can covert a byte in a sequence of two DTMF tones, one encoding the four most significative bits, the other the less significative. Then I watched Bandersnatch ( ) and I felt the necessity to try, in 2019, the experience ( read "the pain") of saving a file on audio cassette.
I intended to use it for radio hacks / experiments. Both groups are enthusiastic and quote instances of how it provides new opportunities to them and how they can plan their lives around this new way of working.This library permits to produce DTMF ( ) tones using Alsa lib and a sound card under Linux and can encode standard file ( text or binary data) in a DTMF tones sequence. For the club members who receive the SMS, the distribution of such information through their mobile phone has saved time and minimised travel, while strengthening their ties to the club. For the administrators, broadcast SMS offers a convenience in what is a voluntary job, communicating information on fixtures, matches and training, essential for the smooth running of the club. SMS are sent by club administrators for information distribution and as reminders for gatherings, causing an increased cohesiveness within the group. This paper examines the use of the mobile phone within two Irish sporting clubs and finds that in both the regular practice of communication has been transformed by the use of broadcast SMS text messages sent using the ‘distribution list’ facility on handsets or through the web. With over 100% penetration, the mobile phone has become a normalised part of everyday communications in Ireland.
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