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Automatic Gain Control (AGC) to correct amplitude errors at input source.

Synchronization identification (used for channel search).

Sync processing for 1f

H

 and 2f

H

 video input source.

Standard detection of PAL, NTSC or SECAM and various 1f

H

 and 2f

H

 component 

video input sources.

Color decoding (ITU-601) for PAL, NTSC or SECAM input sources.

2D comb filtering.

Support for component video sources with sync on CVBS or green.

Fastblank insertion of RGB signals onto CVBS input.

Support for various progressive and interlaced component video sources.

Synchronization of video sources with sync on Y or external H/V inputs.

TV sound decoder

DEMDEC 
DSP

Demodulation, decoding of terrestrial TV audio standards 
.

Audio processor

AUDIO DSP

Processing analog and digital audio sources.

Data Capture Unit

DCU

Acquires VBI data (Teletext; CC; VPS) and formats in a 
stream.

Formatter unit

ITU-656

Formats YUV, VBI data and CVBS data in ITU-656.

Bus Control Unit

BCU

Bus arbitration among all the internal blocks.

I

2

C-bus

The PNX2000 IC is controlled using an I

2

C-bus. It performs like an I

2

C-bus to PI-bus 

bridge, i.e. translates I

2

C-bus slave received commands to PI-bus master commands.

I

2

D

Receives data in three streams from PNX3000.

I

2

S-bus

Serial digital audio interface (6 stereo inputs, 6 stereo outputs) for connection to other 
devices that support the I

2

S-bus standard. Can be used to receive decoded sound 

from a multi-channel digital audio decoder, provide additional ADCs and DACs, or loop 
audio signals through an external processor or delay line.

ITU-656

Mainly intended to transfer output data stream externally to the PNX8550, but the 
output data stream could also be readable by other ITU-656 input devices that 
implement data valid signalling.

DACS

Digital-analog converters used to generate analog outputs from Sound Core.