STV82X6 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'STV82X6' PDF : 97 Pages View PDF
Audio Processor Block
STV82x6
Figure 9: Audio Processor Block Diagram
Smart
Volume
Control
LS_SRD_CTRL (5Bh)
LS_STS_GAIN (5Ch)
LS_STS_FREQ (5Dh)
LS_SRS_SPACE (5Eh)
LS_SRS_CENTER (5Fh)
Loudspeaker Processing
LS_BAL(69h)
LS_VOL_CTRL(67h)
LS_CVOL(68h)
Spatial
Effects
SVC_SEL (59h)
SVC_CTRL (5Ah)
SRS
CUT_ID (00h)
LS_EQ_CTRL (60h)
LS_EQ_BAND1 (61h)
LS_EQ_BAND2 (62h)
LS_EQ_BAND3 (63h)
LS_EQ_BAND4 (64h)
LS_EQ_BAND5 (65h)
LS_LOUD(66h)_
(L+R)/2
Woofer
Lowpass
SW_BAND (6Bh) SW_GAIN (6Ah)
BEEPER_CTRL (79h)
BEEPER_TONE (7Ah)
Beeper
Volume
HPD
Low
Noise
Audio
Mute
ANA_LS_HP (07h)
Smart
Volume (L+R)/2
Control
1
0
SVC_SEL (59h)
SVC_CTRL (5Ah)
SW_ON
ANA_LS_HP (07h)
HP_BAL (77h)
Low Noise
Audio Mute
HP_BT_CTRL (71h)
HP_BASS_GAIN (72h)
HP_TREB_GAIN (73h)
HP_VOL_CTRL (75h)
HP_CVOL (76h)
Headphone Processing
ANA_LS_HP (07h)
Note: The audio signals available on the I²S and SCART outputs are not affected by any digital or analog
matrix processing.
3.2 Smart Volume Control (SVC)
The Smart Volume Control (SVC) feature is designed to process sound level variations caused by
changes in signal sources (e.g. when switching channels) or in volume (e.g. when advertisements
are broadcast). The SVC is controlled by the SVC_ON bit in the SVC_CTRL register.
When the SVC_ON bit is set, the Smart Volume Control prevents annoying volume changes by
automatically adjusting the selected sound source (demodulator or SCART) to a programmable
reference level before audio processing. The regulation ranges from +6 dB to -30 dB with a fast
attenuation and a programmable slow amplification. The fast attenuation reduces audio peak (and
potential clipping) and slow amplification is a compromise between regulation recovery and limited
audio amplification during audio silence. The programmable output reference level must be defined
to prevent internal clipping depending on the selected audio processing boosting functions such as
Surround (up to +9 dB), Equalizer or Bass/Treble (up to +12 dB) and Loudness (up to +6 dB). When
the SVC is enabled, recommended reference values are -18 dB for the Loudspeaker path and -9 dB
for the Headphone path.
When the SVC is disabled, it acts as a wide-range prescaler (between -30 dB and +15.5 dB) before
audio-processing to prevent internal clipping depending on the selected functions (see above). If
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