Owing to the vast increase in the number
of mobile telephones, there is an equally
vast demand (and need) for means of making
listening to third-party telephone conversations
impossible, or at least difficult. Two
such means are introduced here; both are compact
and require only low power. One is based
on the Type FX118 IC from Consumer
Microcircuits Ltd (CML) in England and the
other is the PCD4440 from Philips of Holland,
which is programrnable via an I²C bus.
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