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PDF CAP3001A Data sheet ( Hoja de datos )
| Número de pieza | CAP3001A | |
| Descripción | Car Audio Processor Hardware | |
| Fabricantes | Micronas | |
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MICRONAS
INTERMETALL
PRELIMINARY DATA SHEET
CAP 3001 A
Car Audio Processor
Hardware
Edition April 4, 1996
6251-365-1DS
MICRONAS
1 page  
L+R
MPX0
MPX
Decoder
L–R
AMR
AML or AMIF
AM-
AMIF Mixer
Input
Select
TAPER
TAPEL
AUXR
AUXL
POT1/MPX1
POT2
POT3
POT4
POT5/AVC
FMLEVEL
MPLEVEL
AMLEVEL
Input
Select
Input
Select
SCLKI
SDIN1
WSI
ERR
A/D 0 L–R
FM-Noise
Reduction
L+R
A/D 1
A/D 2
FM-Noise
Detection
Pilot
Mixer
ARI/RDS
Mixer
A/D3
A/D 4
DSP
Input
Buffer
Programmable
Digital Audio
Interface
SCLKO
SDOUT
SDIN2
WSO
DSP Core 1)
Stereo Matrix
Tone Control
Pilot Filter
Loudness
Deemphasis
Noise Reduction
Volume
Balance
ARI Decoding (SK + DK)
RDS Demodulation
CQUAM Demodulation
Multipath Detection
FM/AM-Level Detection
High Blend
Soft Blend
Beep Generator
Stereo Detection
Stereo PLL Filter
Blank Search
Over-
sampled
D/A
DSP
Output
Buffer
Over-
sampled
D/A
Analog
Volume
LF
Analog
Volume
LR
Analog
Volume
RF
Analog
Volume
RR
1) Listed features
depending on
software version
Synthesizer
Auxiliary
Digital Inputs
FMIN AMIN AMTUNOUT
FM TUNOUT
TI1 TI2 TI3
Auxiliary
Digital Outputs
IM-Bus/I 2C
Interface
Clock
QX1
IMDATA IMIDENT
TO1 TO2 TO3
IMCLOCK QX2/ECLK CLKOUT
5 Page 
CAP 3001 A
dB
3
gain
0
*3
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0.0
5.0 10.0 15.0 20.0
f
Fig. 2–10: Digital interpolation filter, passband characteristic
22.05 kHz
dB
0
gain
*50
*80
0.0 50 100 150 200 250 300 350 kHz
f
Fig. 2–11: Digital interpolation filter, attenuation
2.1.13.2. ARI Mixer ARIMX
The ARI-information in the range of 57 kHz is mixed
down to a zero intermediate frequency by the two ARI
mixers, whose mixer signals are again in quadrature.
The reason for using two paths is that the demodulation
is asynchronous in general; in the DSP there should be
an operation which performs the square root of the sum
of the squares of the two input signals. The quality re-
quirements of the square rooting should not be very
high. Because of the phase lock of pilot tone and ARI
carrier in the FM-stereo-mode, a synchronous demodu-
lation seems to be possible; in this case the demodu-
lated ARI signal would be identical with the signal of the
inphase path.
The chosen structure has another potential advantage,
for processing the radio data system (RDS) in Europe.
This signal is a part of the MPX-signal; its subcarrier fre-
quency is the same as that of the ARI-signal but it is rec-
ommended that the two subcarriers are in quadrature.
So the two paths of the ARI demodulation subsystem
make the information of the ARI-signal and of the RDS-
signal available to the DSP, where both can be demodu-
lated if desired.
MICRONAS INTERMETALL
11
11 Page | ||
| Páginas | Total 37 Páginas | |
| PDF Descargar | [ Datasheet CAP3001A.PDF ] | |
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