Akai PDP4294LV1 Service Manual download pdf (Page 46)

VPC 323xD Comb Filter Video Processor

1. Introduction

The VPC 323xD is a high-quality, single-chip video front-end, which is targeted for 4:3 and

16:9. 50/60 Hz and 100/120 Hz TV sets. It can be combined with other members of the

DIGIT3000 IC family (such as DDP 331x) and/or it can be used with 3rd-party products.

The main features of the VPC 323xD are

- High-performance adaptive 4H comb filter Y/C separator with adjustable vertical peaking.

- Multi-standard color decoder PAL/NTSC/SECAM including all substandards.

- Four CVBS, one S-VHS input, one CVBS output.

- Two RGB/YCrCb component inputs, one Fast Blank (FB) input.

- Integrated high-quality A/D converters and associated clamp and AGC circuits.

- Multi-standard sync processing.

- Linear horizontal scaling (0.25

......

4), as well as nonlinear horizontal scaling 'Panoramavision'.

- PAL+ preprocessing.

- Line-locked clock, data and sync, or 656-output interface.

- Peaking, contrast, brightness, color saturation and tint for RGB/YCrCb and CVBS/S-VHS.

- High-quality soft mixer controlled by Fast Blank.

- PIP processing for four picture sizes (1/4, 1/9, 1/16, or 1/36 of normal size) with 8-bit

resolution.

- Control interface for external field memory.

- I

C-bus interface.

- One 20.25-MHz crystal, few external components.

- 80-pin PQFP package.

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Akai PDP4294LV1 Service Manual Page 46