STV82X8 datasheet(82/157 Pages) STMICROELECTRONICS

82 / 157 page

STV82x8

82/157

BTSC_FINE_PRESCALE_SAP

BTSC Input Prescale for SAP Mode

BTSC_CONTROL

BTSC Back-end Decoder Control

Bit Name

Reset

Function

BTSC_FINE_PRES

CALE_ST[7:0]

0000

Set the prescale of the signal coming from the demodulator when STEREO is demodulated in

order to optimize the signal level at DBX block input (steps of 0.02 dB):

1000 0000:

-2.56 dB

...

0000 0000:

0 dB

0000 0001:

0.02 dB

...

0111 1111:

2.54 dB

Address: 91h

Type: R/W

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

BTSC_FINE_PRESCALE_SAP[7:0] (S)

Bit Name

Reset

Function

BTSC_FINE_PRES

CALE_SAP[7:0]

0000

Set the prescale of the signal coming from the demodulator when SAP is demodulated in order to

optimize the signal level at DBX block input (steps of 0.02 dB):

1000 0000:

-2.56 dB

...

0000 0000:

0 dB

0000 0001:

0.02 dB

...

0111 1111:

2.54 dB

Address: 92h

Type: R

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

FINE_PRESC

ALE_SELECT

_SAP

DBX_DEMATRIX[1:0]

DBX_ON

DEEMPHASIS_CH1[1:0]

DEEMPHASIS_CH0[1:0]

Bit Name

Reset

Function

FINE_PRESCALE_

SELECT_SAP

Select the prescale value to apply on second channel before DBX

STEREO prescale (register 90h)

SAP prescale (register 91h)

DBX_DEMATRIX[

1:0]

Select L/R Dematrix for STEREO standard

00: No dematrixing (Mono or SAP)

10: Reserved

01: L/R Dematrix (STEREO): L=Ch0+(Ch1)/2, R=Ch0-(Ch1)/2

11: Reserved

DBX_ON

DBX noise reductor not active

DBX noise reductor active on second channel (STEREO or SAP)

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