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• New Functions
The DSP used in the TS-5700 processes detected
AF signals. The DSP has various functions for pro
cessing digital signals . This section describes the
functions and other features.
1) Transm ission fi lter process i n g
Three types o f filters are used for transmission :
transmission sound quality setting filter, splatter filter,
and speech processor filter. Each of the filters is out
lined below.
•
Transmission sound quality setting filter
Comprised of 8-degree llR filters.
In SSB/AM, it consists of a band-pass filter, the
band is specified by the bandwidth and low edge
frequency.
In FM, it consists of a pre-emphasis filter.
•
Splatter filter
This filter also functions as an FM splatter filter. It
eliminates AF-AGC and limiter distortion.
SSB/AM/FM: 3.6kHz
•
Speech processor filter
The input filter is llR, and the output filter is FIR.
The bandwidth of this filter is linked with that of the
transmission sound quality setting filter.
•
Transm ission soun d qual ity sett i n g fi lter
deg ree/atte n uation
Comprise
Degree Ripple (dB)
Type
B P F
l l R
8
F M p re-e m p h a s i s
l l R
1 + 3
Sp latter f i l t e r
l l R
6
l l R
6
P R OC-I N : Low- L P F
P R O C-I N : M i d- S P F
l l R
6
·
P R O C- I N
H i-B P F
l l R
6
F I R
P R O C-OUT Low-LPF
48
F I R
48
PR OC-OUT M id-LPF
P R O C- O U T : H i- L P F
F I R
48
CIRCU IT D ES CRI PTI O N
L : Simp l e atten uation
Atte n u ation (dB)
0
H : 60
-
-
0
S i m p l e atte n ua t i o n
0
2 0/45
0
2 8/53
0
3 0/60
45
0 . 5
0 . 5
40/45
0 . 5
2 0/45/2 0
2) Receive fi lter process i n g
Filters used for reception include a high-pass filter
and a low-pass filter for slope tuning and a band-pass
filter for CW/FSK mode. 10-degree llR filters are used
as the low-pass filter, high-pass filter, band-pass filter,
delay equalizer, and deemphasis filter. They are out
line below.
•
SSB, AM, FM
AF high-pass filter/low-pass filter for slope tuning
•
CW, FSK
AF BPF
The delay equalizer improves the group delay char
acteristics.
The maximum signal delay time is
30ms.
•
FM
A de-emphasis filter is inserted before the slope
tuning filter.
•
Degree/attenuation
Comprise Degre e Ripple ( d B ) Atte n u ation ( d B )
Mode
Type
S S S/A M
L P F
l l R
6
S S B/A M
H P F
l l R
1 - 4
CW/F S K
B P F
l l R
6 - 8
CW/ F S K
2 - 4
E q u a l izer
l l R
-
FM
l l R
7
•
Band/sett i n g code
SSB/AM SSB/AM
cw
B l a n k pa rts ca n n ot be s e t . T h e CW low edge: 200Hz o r h i g h e r
Low cut Hi cut Center Width
N o .
0
1 0 (0)
1 Ok
400
1
50
1 1 k
450
2
1 0 0
1 . 2 k
500
3
1 5 0
1 3 k
550
1 . 4k
4
2 0 0
600
5
2 5 0
1 . 5 k
650
6
300
1 . 6 k
7 0 0
7
3 5 0
1 . 7 k
7 5 0
8
400
1 . 8 k
800
9
450
2 . 0 k
8 5 0
1 0
500
2 . 2 k
900
1 1
5 5 0
2 . 4k
950
2 . 6 k
1 . 0 k
1 2
600
1 3
650
2 . 8 k
1 4
7 0 0
3 O k
3 . 2 k
1 5
7 5 0
1 6
800
3 . 4k
1 7
850
3 . 6 k
900
4 . 0 k
1 8
1 9
950
4 . 4 k
1 O k
5 . 0 k
2 0
2 1
P KT-1
22
P KT-2
23
P KT-3
TS-5700
0
7 0
S
p l
0
i m
e attenuation/70
0
65
De-emphasis
A l l pass
All pass
-
fi lter
cw
FSK BPF
FSK BPF
Center
Width
50
2 . 2 1 0 0 k/1 . 3 6 0 0 k
2 5 0
1 0 0
2 2 2 5 0 k/1 . 3 7 5 0 k
5 0 0
2 0 0
2 3 3 7 5 k/1 . 4 8 7 5 k
1 . 0 k
300
2 5 5 0 0 k/1 . 7 0 0 0 k
1 . 5 k
400
600
1 k
2 k
27
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