MSP 34x1G
PRELIMINARY DATA SHEET
6.5.6. Identification Mode for A2 Stereo Systems
6.6.1. Stereo Detection Register
for A2 Stereo Systems
Identification Mode
00 15hex
L
Stereo Detection
Register
00 18hex
H
Standard B/G
(German Stereo)
0000 0000
RESET
00hex
Stereo Mode
Reading
(two’s complement)
Standard M
(Korean Stereo)
0000 0001
0011 1111
01hex
3Fhex
MONO
near zero
Reset of Ident-Filter
STEREO
positive value (ideal
reception: 7Fhex
)
To shorten the response time of the identification algo-
rithm after a program change between two FM-Stereo
capable programs, the reset of the ident-filter can be
applied.
BILINGUAL
negative value (ideal
reception: 80hex)
Note: It is no longer necessary to read out and evalu-
ate the A2 identification level. All evaluation is per-
formed in the MSP and indicated in the STATUS regis-
ter.
Sequence:
1. Program change
2. Reset ident-filter
3. Set identification mode back to standard B/G or M
4. Read stereo detection register
6.6.2. DC Level Register
DC Level Readout
FM1 (MSP-Ch2)
00 1Bhex
00 1Chex
H+L
H+L
6.5.7. FM DC Notch
DC Level Readout
FM2 (MSP-Ch1)
The DC compensation filter (FM DC Notch) for FM
input can be switched off. This is used to speed up the
automatic search function (see Section 6.4.7.). In nor-
mal FM-mode, the FM DC Notch should be switched
on.
DC Level
[8000hex ... 7FFFhex]
values are 16 bit two’s
complement
The DC level register measures the DC component of
the incoming FM signals (FM1 and FM2). This can be
used for seek functions in satellite receivers and for IF
FM frequencies fine tuning. A too low demodulation
frequency (DCO) results in a positive DC-level and
vice versa. For further processing, the DC content of
the demodulated FM signals is suppressed. The time
constant τ, defining the transition time of the DC Level
Register, is approximately 28 ms.
FM DC Notch
00 17hex
L
ON
0000 0000
Reset
00hex
OFF
0011 1111
3Fhex
6.6. Manual/Compatibility Mode:
Description of DSP Read Registers
6.7. Demodulator Source Channels in Manual Mode
6.7.1. Terrestric Sound Standards
All readable registers are 16-bit wide. Transmissions
via I2C bus have to take place in 16-bit words. Some of
the defined 16-bit words are divided into low and high
byte, thus holding two different control entities.
Table 6–16 shows the source channel assignment of
the demodulated signals in case of manual mode for
all terrestric sound standards. See Table 2–2 for the
assignment in the Automatic Sound Select mode. In
manual mode for terrestric sound standards, only two
demodulator sources are defined.
These registers are not writable.
6.7.2. SAT Sound Standards
Table 6–17 shows the source channel assignment of
the demodulated signals for SAT sound standards.
96
MICRONAS INTERMETALL
MICRONAS [ MICRONAS ]
