STV82X8 datasheet(104/157 Pages) STMICROELECTRONICS

tên linh kiện	STV82X8

Giải thích chi tiết về linh kiện	Digital Audio Decoder / Processor for BTSC Television/Video Recorders

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STV82x8

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SVC_LS_CONTROL

Smart Volume Control for LS

SVC_LS_TIME_TH

Smart Volume Control Parameters for LS

Address: BEh

Type: R/W

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

SVC_LS_INPUT[1:0]

SVC_LS_AMP

SVC_LS_ON

Bit Name

Reset

Function

Bits[7:4]

0000

Reserved.

SVC_LS_INPUT[

1:0]

Select input for peak detection in multichannel mode:

00: Left/Right

01: Center

10: Left/Right/Center

11: Not Used

SVC_LS_AMP

0 dB amplification in auto-mode

+6 dB amplification in auto-mode

SVC_LS_ON

Manual mode(simple prescaler)

Automatic mode

Address: BFh

Type: R/W

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

SVC_LS_TIME[2:0]

SVC_LS_THRESHOLD[4:0]

Bit Name

Reset

Function

SVC_LS_TIME[2:0] 100

Time Constant for Amplification (6-dB gain step) in Automatic mode:

000:

30 ms

100:

16 s

001:

200 ms

101:

32 s

010:

500 ms

110:

64 s

011:

1 s

111:

128 s

SVC_LS_THRESH

OLD[4:0]

11000

See tables 8 and 9

Table 17: Gain (Threshold Field) Values in Manual mode

Manual Mode

Gain (dB)

00101

+15.5

00100

+12

00011

+9.5

00010

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