TS-5700
CIRCUIT DESCRIPTION
Control U n it ( DSP)
• Outl ine
The TS-570D uses the DSP to 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
•
Noise and interference processing (noise reduc
tion, beat cancel)
•
CTCSS decoder
----
-
-------
NJM2100M
MOD/ANO
AF
DET
MIC/DRU-3A
·-------
- - -
-
µCOM
BUS
M37710EFBJQF
*
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.
CODEC
AK4506-VS
DSP
ADSP218KS-115
EPROM
27C01012DJPH
*
12KHz
384KHz
3072KHz
TC74HC4040AF
24.576
12KHz
MHz
384KHz
3072KHz
Fig.
1 7
DSP section block diagram
2 1