STV82X6 datasheet(12/95 Pages) STMICROELECTRONICS

12 / 95 page

Demodulator Block

STV82x6

12/95

Sound Carrier Frequency Offset Recovery: Both Mono and Stereo IF Carrier frequencies can be

adjusted independently (registers CAROFFSET1 and CAROFFSET2) within a large range (up to

120 kHz for standard mono FM deviations) while the AUTOSTD system remains active. The

frequency offset estimation is written in registers FM_DCL and FM_DCR (Mono Left / Channel 1

And Mono Right / Channel 2, respectively) and can be used to implement the Automatic Frequency

Control (AFC) via an external I²C control.

If required, the AUTOSTD system can be disabled (Manual mode) and the user can control all

registers including those only controlled by the AUTOSTD function when active. Manual mode is

selected in registers RESET or AUTO_SCKM.

2.1.3

Sound Preprocessing and Selection

The demodulated sound signal can be redirected to 4 different output audio channels:

1. Loudspeaker & Subwoofer,

2. Headphone,

3. SCART,

4. I²S Interface.

Each output channel can independently select the demodulator source, analog SCART or I²S inputs

using register CH_SEL.

Figure 7: Sound Preprocessing and Selection Block Diagram

Prescaler

Dematrix

NICAM

I²S OUT

Peak

Detector

FM/AM

AUDIO IN

(From Input Analog Audio Matrix)

(From Demodulator)

LS IN

(To Loudspeaker Processing)

HP IN

(To Headphone Processing)

AUDIO OUT

(To Output Analog Audio Matrix)

(To I²S Interface)

(From Demodulator)

PRE_FM(44h)

PRE_NICAM(45h)

PRE_AUX(46h)

PEAK_DET_CTRL(4Bh)

PEAK_DET_STATL(4Ch)

CH_MX(48h)

CH_SEL(49h)

CH_LANG(4Ah)

FM_DCL(42h)

FM_DCR(43h)

Removal

Prescaler

Dematrix

NICAM

Prescaler

SCART

De-emphasis

NICAM

De-emphasis

I²S IN

PRE_AUX(46h)

CH_MX(48h)

Prescaler

I²S

PEAK_DET_STATR(4Dh)

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