M8870 receiver equivalent, dtmf receiver.
include: telephone switch equipment, remote data entry, paging systems, personal computers, credit card systems
The M-8.
M-8870 operating functions (see Figure 2) include a bandsplit filter that separates the high and low tones of the received pair, and a digital decoder that verifies both the frequency and duration of the received tones before passing the resulting 4-.
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