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Control U n it ( DS P )
• Outl i n e
The TS-570D uses the DSP t o process audio signals
the detection output of the conventional models. The
processes are listed below. A block diagram of the
DSP and a function block diagram of processes in the
DSP are shown below for reference.
•
Sidetone and beep generation
•
Transmit/receive filter processing
•
Voice equalizing processing
•
Speech processing
•
VOX processing
•
Mic amplifier AGC processing
•
CW tune function
•
N oise and interference processing (noise reduc
tion, beat cancel)
•
CTCSS decoder
MOD/ANO
MIC/DRU-3A
M37710EFBJQF *
CIRCUIT DESCRIPTION
-
----
-------
NJM2100M
AF
DET
·-------
-
- - -
µCOM
BUS
ADSP218KS-115
27C01012DJPH *
Fig. 1 7
DSP section block d i ag ram
The DSP circuits are divided into an analog section
that processes analog signals and a digital section that
processes digital data. The analog section contains a
buffer amplifier (IC503, IC505, IC506: NJM21 OOM) for
CODEC input/output, and analog switch (IC502:
BU4066BCFV). The digital section contains a clock di
viding circuit which supplies clock signals to the
CODEC and DSP. The CODEC (IC504: AK4506-VS) in
terfaces between the analog and digital sections.
12KHz
384KHz
3072KHz
AK4506-VS
CODEC
TC74HC4040AF
24.576
MHz
DSP
EPROM
TS-5700
12KHz
384KHz
3072KHz
2 1
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