High End Digital Set-Top Box

DRAM

L

R

L

R

Graphics

RF

Vol.

Ctrl

RF

Mod

Audio/Video

Processor/

Descrambler

QAM,VSB

or QPSK

Demod

SAW

Filter

Analog

IF Demod

TUNER

RF PLL,

AGC,

Mixer

SPLITTER

Band-Split

Filter

QPSK/FSK RX

QPSK/FSK TX

MPEG-II

Digicipher

Video

Decoder

DRAM

MPEG/

AC3

AUDIO

Decoder

Audio

D/A

Video

Switch/

Overlay

Audio

Switch

Embedded

Microprocessor

ROM

RGB

to

YUV

IR RX

Keypad

IF

AGC

Mixer

A/D

FEC

Authorization

card

Composite

Analog Video

SRAM

Serial Port

TV

Analog Set-Top Path

Switching

Power Supply

Tuner

Modulator

CPU

ROM

High End

Graphics option

Display

Dialer/

Modem

Phone

Line

Decrypt

Cond.

Access

MPEG

X PORT

Video D/A

NTSC/PAL

Encoder

FLASH

RS-232

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