STV8247 datasheet(25/156 Pages) STMICROELECTRONICS

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STV82x7

Dedicated Digital Signal Processor (DSP)

A dedicated Digital Signal Processor (DSP) takes charge of all audio processing features and the

low frequency signal processing features of the demodulator. The internal 24-bit architecture will

ensure a high quality signal treatment and an excellent dynamic.

4.1

Back-end Processing

The “back-end” processing corresponds to the low frequency signal processing (32 kHz or higher

frequencies) of the demodulator and other inputs (I²S, ADC).

Figure 11 shows a flowchart of the back-end processing tasks. However, the figure shows that the

processing is only a SINGLE SOURCE PROCESSING flow (no processing is possible with

“Demod + SCART” and I²S inputs simultaneously) and that the selection of a headphone output

restricts the loudspeakers configuration to 2+1 instead of 5+1.

Figure 11: Back-end Audio Processing

FM Channel1

FM Channel2

NICAM L

De-emphasis

Prescale

Dematrix

Autostandard

Removal

Prescale

I²S

I2S in 1

I2S in 2

I2S in 3

Prescale

NICAM

Removal

Prescale

SCART

Removal

NICAM R

Dematrix

NICAM

SCART L

SCART R

SRC X2/X4

“I2S” Input Mode

“Demod + SCART” or “SCART only” Input Modes

SCART

2 to 6

SCART

(L and R)

(L,R,C,LFE,Ls,Rs)

(L and R)

De-emphasis

NICAM

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