STV8236 datasheet(18/97 Pages) STMICROELECTRONICS

18 / 97 page

Audio Processor Block

STV82x6

18/97

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

Figure 9: Audio Processor Block Diagram

Spatial

Effects

Lowpass

Beeper

Woofer

Volume

SRS

(L+R)/2

Loudspeaker Processing

SW_ON

Headphone Processing

Low

Audio

Audio Mute

Smart

Volume

Control

BEEPER_CTRL (79h)

BEEPER_TONE (7Ah)

SVC_SEL (59h)

SVC_CTRL (5Ah)

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_BAL(69h)

SW_BAND (6Bh) SW_GAIN (6Ah)

ANA_LS_HP (07h)

HPD

LS_VOL_CTRL(67h)

LS_CVOL(68h)

LS_SRD_CTRL (5Bh)

LS_STS_GAIN (5Ch)

LS_STS_FREQ (5Dh)

LS_SRS_SPACE (5Eh)

LS_SRS_CENTER (5Fh)

ANA_LS_HP (07h)

HP_VOL_CTRL (75h)

HP_CVOL (76h)

HP_BAL (77h)

HP_BT_CTRL (71h)

HP_BASS_GAIN (72h)

HP_TREB_GAIN (73h)

SVC_SEL (59h)

SVC_CTRL (5Ah)

CUT_ID (00h)

ANA_LS_HP (07h)

Low Noise

Noise

Mute

LS_LOUD(66h)_

Smart

Volume

Control

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