Abstract
To communicate with the telephone line chip-cards (IC cards) require terminals or other special apparatus, equipped with a card reader for retrieving the information on a card.
Also in the case of disabled or sick people problem exists of dialing of a phone number in distress. To solve these problems a special chip-card was designed, equipped with an electro-acoustical transducer and a DTMF (Dual Tone Multi Frequency) tone generator, for acoustic communication with a telephone line through the microphone of a regular telephone apparatus
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References
I. Malinowski, „Chip-card for communicating with the telephone line by means of DTMF tones” US Patent 4,995,077
http://en.wikipedia.org/wiki/DTMF
AT&T Compatibility Bulletin No. 105, Issue #1, August 8, 1975
ANSI T1.401-1988, Interface between Carriers and Customer Installations-Analog Voicegrade Switched Access Lines Using Loop-Start and Ground-Start Signaling
http://nemesis.lonestar.org/reference/telecom/signaling/dtmf.html
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© 2007 Springer-Verlag Berlin Heidelberg
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Malinowski, I. (2007). Chip card for communicating with the telephone line using DTMF tones. In: Jabłoński, R., Turkowski, M., Szewczyk, R. (eds) Recent Advances in Mechatronics. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-73956-2_94
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DOI: https://doi.org/10.1007/978-3-540-73956-2_94
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-540-73955-5
Online ISBN: 978-3-540-73956-2
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