Only For Training And Service Purposes - LG KC780 Service Manual

S-GOLDradio also enables video down-streaming because of its DSP and ARM performances.
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Supported "still pictures" multimedia scenarios are:
• View Finding for a Picture Snapshot: Captured frames are transferred from the camera IF to the
display IF at up to15 fps (depending on the camera used) in QCIF resolution (depending on the display
used). Downscaling and color conversion is done by the camera and display interface logic. Therefore,
view finding for a snapshot is possible without burdening the CPU. However, picture rotation and/or
overlay are performed by SW if required.
• Shooting: The captured picture, with up to 1.31 MPixel resolution (SXGA 1280 x 1024), is transferred
within 1/15 sec to external memory.
frozen so that the user can immediately see the snapshot on the display.
• Photo Flash: Under low light conditions usually a photo flash is required. To activate the flash at the
right time, a general purpose timer unit (GTPU) can be used that is triggered by the frame synchronization
signal (VSYNC) from the camera interface.
• Processing: JPEG thumbnail generation, picture overlay, picture rotation and other picture processing
tasks are performed by SW.
• Viewing: A JPEG picture is decoded, down-scaled and format converted by SW and then transferred to
the display interface. JPEG thumbnails can also be transferred directly to the display interface after
decoding by SW without additional downscaling.
• Storage: JPEG pictures can be stored on an MMC/SD card, a Flash or a PC.
• Sending/Receiving: JPEG thumbnails can be sent/received as MMS (E-GPRS). Full resolution JPEG
pictures can be sent/received as e-mail or downloaded from the internet.
Supported "video sequence" multimedia scenarios:
• Record Video Sequences: Captured frames in QCIF resolution are transferred to internal memory at 15
fps. H.263 or MPEG-4 encoding is performed on-the-fly by SW with the support of the MOVE coprocessor.
The audio recording is performed on the DSP (GSM AMR CODEC). Multiplexing of audio and video
streams is performed by the ARM.
• View Finding during Video Encoding: During video recording the user needs to see what is being
recorded. Therefore, the captured frames are not only encoded but also transferred to the display
interface. If only every second frame from the camera is used for encoding, viewfinding is possible without
burdening the CPU. However, if each frame from the camera has to be encoded, due to low camera frame
rate, the YCbCr4:2:2 to YCbCr4:4:4 color conversion and further downscaling is performed by SW.
Picture rotation and overlay has to be done in SW in any case.
• Storage: Compressed H.263 or MPEG-4 videos can be stored on an MMC/SD, a Flash or a PC.
• Viewing: De-multiplexing of audio and video streams is performed by the ARM. The H.263 or MPEG-4
decoding is also done by SW on the ARM and then the frames are transferred to the display interface.
Audio decoding (GSM-AMR) is done on the DSP.
The audio/video synchronization is done by time stamp feedback from the DSP to the ARM.
• Sending/Receiving: H.263 or MPEG-4 videos can be sent/received as MMS (E-GPRS), as e-mail or
downloaded from the internet.
Higher Multimedia Performance
If higher multimedia performance is required, an external multimedia IC can be connected to
S-GOLDradio because it contains a multimedia IC interface module. The camera and display interface
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pins are used in a multiplex mode to connect an external multimedia IC to the S-GOLDradio
IC interface module. The display and camera are connected to the multimedia IC, which contains
functions (in HW and/or SW) to process still images and video data. This configuration is intended for
Copyright © 2008 LG Electronics. Inc. All right reserved.

Only for training and service purposes

Then, JPEG compression is done by SW, while the viewfinder is
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3. TECHNICAL BRIEF
multimedia
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LGE Internal Use Only