參數(shù)資料
型號(hào)： TDA7412
廠商： STMICROELECTRONICS
元件分類： 音頻控制
英文描述： 1 CHANNEL(S), TONE CONTROL CIRCUIT, PQFP44
封裝： 10 X 10 MM, 1.40 MM HEIGHT, TQFP-44
文件頁(yè)數(shù)： 24/56頁(yè)
文件大?。?/td> 716K
代理商： TDA7412
TDA7412
30/56
3.0 FUNCTIONAL DESCRIPTION OF STEREODECODER
Figure 23. Block diagram of Stereodecoder
The stereodecoder-part of the A679 (see Fig. 23) contains all functions necessary to demodulate the MPX-sig-
nal like pilottone-dependent MONO/STEREO-switching as well as "stereoblend" and "highcut". Adaptations like
programmable input gain, roll-off compensation, selectable deemphasis time constant and a programmable
fieldstrength input allow to use different IF-devices.
3.1 Stereodecoder-Mute
The A679 has a fast and easy to control RDS-Mute function which is a combination of the audioprocessor's Soft-
Mute and the high-ohmic mute of the stereodecoder. If the stereodecoder is selected and a SoftMute command
is sent (or activated through the SM-pin) the stereodecoder will be set automatically to the high-ohmic mute con-
dition after the audio-signal has been softmuted. Hence a checking of alternate frequencies could be performed.
Additionally the PLL can be set to "Hold"-mode, which disables the PLL input during the mute time. To release
the system from the mute condition simply the unmute-command must be sent: the stereodecoder is unmuted
immediately and the audioprocessor is softly unmuted. Fig. 26 shows the output-signal VO as well as the internal
stereodecoder mute signal. This influence of SoftMute on the stereodecoder mute can be switched off by setting
bit 3 of the SoftMute byte to "0". A stereodecoder mute command (bit 0, stereodecoder byte set to "1") will set
the stereodecoder in any case independently to the high-ohmic mute state.
If any other source than the stereodecoder is selected the decoder remains muted and the MPX-pin is connect-
ed to Vref to avoid any discharge of the coupling capacitor through leakage currents. No further mute command
should be applied.
INGAIN
3.5 ... 11dB
STEP 2.5dB
INFILTER
LP 80KHz
4.th ORDER
DEMODULATOR
- PLOT CANC
- ROLL-OFF COMP.
- LP 25KHz
PLL +
PILOT-DET.
F19
NOISE BLANKER
F38
STEREO
HOLDN
NOISE
SB CONTROL
MULTIPATH DET.
DEEMPHASIS
+ HIGHCUT
t=50.62..5.75,100
s
(37.5,47,56,75
s)
REF 5V
VSBL
MPHCINFL
MPHCOUT
MPSBOUT
HC
CONTROL
VHCCH
VHCCL
D
5 bits
A
LEVEL INPUT
LEVELSB-LP
LEVEL
MPSBINFL
FM_L
FM_R
MPX
100K
AM
AM-IF
100K
D00AU1135
LEVELHC-LP
GAIN 0..6dB
QUALITY
DETECTOR
QUAL
MP-OUT
MP-IN
-
+
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