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19
KI
5
Amplifier circuit
Schmitt circuit
CPU 11
Output signal from the EAR PHONE jack of the tape recorder is amplified and shaped in the
Schmitt
circuit,
to be input to the CPU II through the KiS terminal of the CPU
II.
5-2.
Reproduction
When recording signal
"1"
is to be
recorded,
Sl 5 is turned low level and the
signal
F4 (clock
pulse
of' . .;' .
4KHz) is output during that
period.
When recording signal
"O" is
to be
recorded,
SI 5
is turned high level and the F4 output is inhibited during that
period,
at which duration the
reverse signal of HA (clock pulse
of:::
2KHz) is carried on the recording signal.
Then,
this signal is supplied to the MIC terminal
of
the tape
recorder via
the modulation circuit
of the CE121.
Signal waveform
at
the
time
of recording
Recording signal
(F 4
11)
F4
HA
s
15
., ~
F<"---+
To CE121 cassette rnodulation circuit
Sl5
~
Recording signal (F4") generation circuit
area
ring
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