As a voice switched speaker-phone integrated circuit, the UTC
MC34118
includes the necessary amplifiers, attenuators, level
detectors and control algorithm.
To form the UTC
MC34118
’s internal circuit, there is an internal
microphone amplifier with adjustable gain and mute control, internal
transmit and Receive attenuators (operate in a complementary
manner), level detectors at both in
put and output of both attenuators,
and background noise monitors for both the transmit and receive
channels.
The dial tone can be pretended fr
om being attenuated by the
receive background noise monitor circuit by a dial tone detector.
There are also two line driver amplifiers which can be used to form a
hybrid network in conjunction with an external coupling transformer. A
high-pass filter can be used for other
filtering functions, and especially
to filter out 60Hz noise in the receive channel.
The UTC
MC34118
which requiring typically 5mA may be
operated from a power supply, or
it can be powered from the
telephone line
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