Toshiba 42HM66 - 42" Rear Projection TV, Service Manual

Page: 33 / 64

33
4.1.5 Audio Processor
The MSP3445 is single-chip multi-standard sound processor of NTSC analog TV standard. The full TV sound
processing, starting with analog sound IF signal-in, down to processed analog AF-out, is performed in a single
chip.
This TV sound processing IC include version for processing the multi-channel television sound (MTS) signal
conforming to the standard recommended by the Broadcast Television System Committee (BTSC). Current IC
have to perform adjustment procedures in order to achieve good stereo separation for BTSC. The MSP3445
has optimum stereo performance without any adjustment.
The MSP3445 has built-in automatic function: The IC is able to detect the actual sound standard automatically
(Automatic Standard Detection). Furthermore, pilot levels and identification signals can be evaluated internally
with subsequent switching between mono/stereo/bilingual; no I
2
C interaction is necessary (Automatic Sound
Selection). The IC also include the Bass and Treble function.