最終更新日：2022/12/23
In this additional spectrum, in-band signaling was sent down the wires outside the frequencies used for conversation. Actually, the signals were sent across the 3,500- and 3,700-Hz frequencies. Although these worked and were not in the talk path (out of the band) they were limited in the number of tones that could be sent.
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元となった例文
In
this
additional
spectrum,
in-band
signaling
was
sent
down
the
wires
outside
the
frequencies
used
for
conversation.
Actually,
the
signals
were
sent
across
the
3,500-
and
3,700-Hz
frequencies.
Although
these
worked
and
were
not
in
the
talk
path
(out
of
the
band)
they
were
limited
in
the
number
of
tones
that
could
be
sent.
