Rastergraf
5-26 Programming On-board Devices and Memories
5.11 Bt835 NTSC/PAL/SECAM Video Decoder
Note: this section is derived from Conexant’s Bt835 Product Brief
What is a Video Decoder?
A video decoder is a chip that allows live video from a television
broadcast, a video tape or a camera to be brought into a computer. To
accomplish this, the chip must first track the video signal, digitize it,
separate out the brightness and color information from the signal, and send
the digital ones and zeros representing the video signal to the computer’s
video subsystem. Once captured, the digital bits representing the video
image can be manipulated by video-related applications.
Features
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Digitizes composite, S-video, and NTSC/PAL/SECAM to YCrCb
•
Square pixel and CCIR601 resolution for NTSC, PAL, and SECAM
•
2H adaptive comb filtering (NTSC)
•
High quality horizontal and vertical filtered down-scaling
•
Closed caption and VBI data decoding
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Vertical blanking interval data pass-through
•
Programmable temporal decimation for a reduced frame-rate video
•
Programmable hue, brightness, saturation, and contrast
•
Two-wire I
2
C bus interface
•
Software selectable four-input analog multiplexer
•
Auto NTSC/PAL format detect and gain control
•
User programmable peaking filter
•
Introduction
The Conexant Bt835 video capture processor is a single-chip decoding and
filtered scaling solution for analog NTSC/PAL/SECAM base-band signals
from TV tuners, VCRs, cameras, and other sources of composite or Y/C
video. The Bt835 is a video-capture solution that integrates video
digitization, synchronization, 2H adaptive Y/C separation, scaling and
VBI data pass-through functions. Using mixed signal and DSP circuitry,
the Bt835 converts an analog composite video waveform into a scaled
digital video stream while supporting a variety of video formats.
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