TDA7407 STMicroelectronics, TDA7407 Datasheet - Page 26

• Manufacturer Part Number: TDA7407
• Description: IC PROCESSOR CAR SIGNAL 44TQFP
• Manufacturer: STMicroelectronics
• Type: Car Signal Processorr

Specifications of TDA7407

• Applications: Automotive Audio
• Mounting Type: Surface Mount
• Package / Case: 44-LQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 497-3979

Multipath detector
5.2
5.2.1
Figure 18. Block diagram of the stereo decoder
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Functional description of the stereo decoder
The stereo decoder part of the TDA7407 (see
demodulate the MPX signal like pilot tone dependent MONO/STEREO switching as well as
"stereoblend" and "highcut" functions.
Stereo decoder Mute
The TDA7407 has a fast and easy to control RDS mute function which is a combination of
the audioprocessor's softmute and the high ohmic mute of the stereo decoder. If the stereo
decoder is selected and a softmute command is sent (or activated through the SM pin), the
stereo decoder will be set automatically to the high ohmic mute condition after the audio
signal has been softmuted.
Hence a checking of alternate frequencies could be performed. To release the system from
the mute condition, the unmute command must be sent: the stereo decoder is unmuted
immediately and the audioprocessor is softly unmuted.
VO as well as the internal stereo decoder mute signal. This influence of Softmute on the
stereo decoder mute can be switched off by setting bit 3 of the Softmute byte to "0". A stereo
decoder mute command (bit 0, stereo decoder byte set to "1") will set the stereo decoder in
any case independently to the high ohmic mute state.
Figure
18) contains all functions necessary to
Figure 19
shows the output signal
TDA7407