参数资料
型号: TDA7407
厂商: STMICROELECTRONICS
元件分类: 消费家电
英文描述: SPECIALTY CONSUMER CIRCUIT, PQFP44
封装: 10 X 10 MM, 1.40 MM HEIGHT, LQFP-44
文件页数: 19/46页
文件大小: 692K
代理商: TDA7407
Obsolete
Product(s)
- Obsolete
Product(s)
Multipath detector
TDA7407
5.2
Functional description of the stereo decoder
The stereo decoder part of the TDA7407 (see Figure 18) contains all functions necessary to
demodulate the MPX signal like pilot tone dependent MONO/STEREO switching as well as
"stereoblend" and "highcut" functions.
5.2.1
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. Figure 19 shows the output signal
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.
Block diagram of the stereo decoder
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