STV82X6 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'STV82X6' PDF : 97 Pages View PDF
Audio Matrices
STV82x6
4.1 Input Audio Matrix
The mono input (MONOIN) and three stereo SCART inputs (AI1L, AIR1), (AI2L, AI2R) and (AI3L,
AI3R) can be switched to any audio output and the same source can be connected to different
outputs. The inputs can totally bypass the STV82x6 functions (Thru mode) via the full analog
SCART path or use the audio processing corresponding to the different audio outputs. The input
matrix is programmed in bits DSP_ISCART_SEL[1:0] of register ANA_SCART.
In Thru mode, the STV82x6 is switched into Low Power mode (Standby) and the audio matrix
configuration (ANA_SCART register) is memorized and is not reset when switched back to Full
Power mode. See Section 7.2: Standby Mode.
Before processing the audio signal, the selected analog input is converted into a digital 16-bit signal
and pre-processed. Its sound level can be prescaled within a range between -6 dB and +6 dB in
steps of 1 dB (register PRE_AUX) and for Left/Right channels (register CH_MX). The internal level
can be measured with the Peak Level Detector.
4.2 Output Audio Matrix
The Loudspeaker+Subwoofer (LSL, LSR, SW), Headphone (HPL, HPR) and I²S (SDO) outputs can
directly select two possible sources which are either the demodulated signal or the converted audio
input (from the SCART or mono input) in register CH_SEL. In the event of a dual mono source, the
language is selected in register CH_LANG.
The two analog SCART outputs (AO1L, AO1R) and (AO2L, AO2R) can be used to bypass the
STV82x6 functions by directly selecting the analog input SCARTs or the output digital source from
the demodulator or the converted audio input (with prescaling and Left/Right re-matrixing). The
SCART output is selected in register ANA_SCART and the digital source in register CH_SEL. In the
event of a dual mono source, the language is selected in register CH_LANG as other audio outputs.
In the event of a demodulator source selection, the mute is automatically controlled for all audio
outputs.
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