STD0550 ST Microelectronics, Inc., STD0550 Datasheet - Page 6

• Manufacturer Part Number: STD0550
• Description: Matrix Display Digital TV Processor
• Manufacturer: ST Microelectronics, Inc.

STD0550
1.2.1
1.2.2
MPEG Video Decoder
This is a real-time video compression processor supporting the MPEG-1 and MPEG-2 standards at
video rates up to 720 x 480 x 60 Hz and 720 x 576 x 50 Hz. Picture format conversion for display is
performed by vertical and horizontal filters. The MPEG video decoder includes a display unit with
five display planes as shown in the figure below. The display planes are normally overlaid in the
order illustrated, with the background color at the back and the sub-picture at the front (used as a
cursor plane). The sub-picture plane can alternatively be positioned between the OSD and MPEG
video planes where it can be used as a second on-screen display plane. The MPEG display unit is
used for MHP or MHEG-5 applications.
Figure 3: MPEG display planes
Digital Audio Decoder
The audio decoder supports the decoding of the following formats: Dolby Digital, MPEG-1 layers
I, II and III (MP3), MPEG-2 layer II 6 channels, PCMmultichannel linear PCM (LPCM).
S/PDIF input data (IEC-60958 or IEC-61937 standards) is accepted if an external circuitry
extracts the PCM clock from the stream.
Skip frame, repeat blocks and soft mute frame features can be used to synchronize audio and
video data. PTS audio extraction is also supported.
The device outputs up to 6 channels of PCM data and appropriate clocks for external digital-to-
analog converters.
Programmable downmix enables 1, 2 or 3 channel outputs. Data can be output in either I²S
format or Sony format. The decoder can format output data according to IEC-60958 standard
(for non compressed data: L/R channels, 16, 18, 20 and 24-bits) or IEC-61937 standard (for
compressed data), for F
Sampling frequencies of 48 kHz, 44.1 kHz, 32 kHz and half sampling frequencies are supported.
A downsampling filter (48 kHz) is available.
The decoder supports dual mode for MPEG and Dolby Digital.
On-screen display
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Background
color
Decompressed
video
Still
picture
plane
S
= 48 kHz, 44.1 kHz or 32 kHz.
Sub-picture plane
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Subpicture optional
positions
Overlaid planes
General Description
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