參數(shù)資料
型號(hào)： MSP3430
廠商： Electronic Theatre Controls, Inc.
英文描述： Multistandard Sound Processor Family
中文描述： 多標(biāo)準(zhǔn)聲音處理器系列
文件頁數(shù)： 92/101頁
文件大?。?/td> 752K
代理商： MSP3430
MSP 34x0G
PRELIMINARY DATA SHEET
92
Micronas
6.4.4. NICAM Error Rate Register
Average error rate of the NICAM reception in a time
interval of 182 ms, which should be close to 0. The ini-
tial and maximum value of ERROR_RATE is 2047.
This value is also active if the NICAM bit of
MODE_REG is not set. Since the value is achieved by
filtering, a certain transition time (approx. 0.5 sec) is
unavoidable. Acceptable audio may have error rates
up to a value of 700 int. Individual evaluation of this
value by the controller and an appropriate threshold
may define the fallback mode from NICAM to FM/
AM-Mono in case of poor NICAM reception.
The bit error rate per second (BER) can be calculated
by means of the following formula:
BER = ERROR_RATE * 12.3*10
6
/s
6.4.5. PLL_CAPS Readback Register
It is possible to read out the actual setting of the
PLL_CAPS. In standard applications, this register is
not of interest for the customer.
6.4.6. AGC_GAIN Readback Register
It is possible to read out the actual setting of
AGC_GAIN in Automatic Gain Mode. In standard
applications, this register is not of interest for the cus-
tomer.
6.4.7. Automatic Search Function for FM-Carrier
Detection in Satellite Mode
The AM demodulation ability of the MSP 3410G and
MSP 3450G offers the possibility to calculate the
“
field
strength
”
of the momentarily selected FM carrier,
which can be read out by the controller. In SAT receiv-
ers, this feature can be used to make automatic FM
carrier search possible.
For this, the MSP has to be switched to AM-mode
(MODE_REG[8]), FM-Prescale must be set to
7F
hex
=
+
127
dec
, and the FM DC notch (see section
6.5.7.)
must be switched off. The sound-IF frequency
range must now be
“
scanned
”
in the MSP-channel 2 by
means of the programmable quadrature mixer with an
appropriate incremental frequency (i.e. 10 kHz). After
each incrementation, a field strength value is available
at the quasi-peak detector output (quasi-peak detector
source must be set to FM), which must be examined
for relative maxima by the controller. This results in
either continuing search or switching the MSP back to
FM demodulation mode.
During the search process, the FIR2 must be loaded
with the coefficient set
“
AUTOSEARCH
”
, which
enables small bandwidth, resulting in appropriate field
strength characteristics. The absolute field strength
value (can be read out of
“
quasi-peak detector output
FM1
”
) also gives information on whether a main FM
carrier or a subcarrier was detected; and as a practical
consequence, the FM bandwidth (FIR1/2) and the
deemphasis (50
μ
s or adaptive) can be switched
accordingly.
Due to the fact that a constant demodulation frequency
offset of a few kHz leads to a DC level in the demodu-
lated signal, further fine tuning of the found carrier can
be achieved by evaluating the
“
DC Level Readout
FM1
”
. Therefore, the FM DC Notch must be switched
on, and the demodulator part must be switched back to
FM-demodulation mode.
For a detailed description of the automatic search
function, please refer to the corresponding MSP Win-
dows software.
ERROR_RATE
00 57
hex
Error free
0000
hex
maximum error rate
07FF
hex
PLL_CAPS
02 1F
hex
L
minimum frequency
1111 1111
FF
hex
nominal frequency
0101 0110
RESET
56
hex
maximum frequency
0000 0000
00
hex
PLL_CAPS
02 1F
hex
H
PLL open
xxxx xxx0
PLL closed
xxxx xxx1
AGC_GAIN
02 1E
hex
max. amplification
(20 dB)
0001 0100
14
hex
min. amplification
(3 dB)
0000 0000
00
hex
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