LG GX500 Service Manual page 30

GX500 Operational Description
Audio
Besides the telephony voice CODECs supplied by the Firmware running on the TEAKLite® DSP core, the
ARM926 core enables running high-quality audio CODECs such as MPEG-1/2 Layer-3 Decode (MP3), AAC+ or
AAC++. Audio streaming is supported according to the 3GPP PSS Release 4 standard.
The output of audio and voice codecs can be mixed and routed to the integrated Hi-Fi Stereo voiceband
supporting CD-Quality. Alternatively, the audio can also be sinked to a mono loudspeaker using the
integrated hands-free amplifier.
Video and Imaging
S-GOLDradio allows connecting an external camera module over an ITU-R BT656 compliant interface and a
TM
display module over a microcontroller-like parallel or serial interface. Furthermore, ARM's MOVE coprocessor
is integrated to accelerate video encoding algorithms (for example, H.263 or MPEG-4). This fulfills basic
multimedia requirements and allows connecting commodity cameras and displays without the need of an
additional multimedia IC. The computational power for encoding and decoding still pictures (JPEG) and video
sequences (H.263 or MPEG-4) is provided by the integrated ARM926 core. Over-the-air interface JPEG pictures
and H.263 or MPEG-4 videos can be sent or received as MMS by means of (E)GPRS.
S-GOLDradio also enables video down-streaming because of its DSP and ARM performances.
TM
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.
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Then, JPEG compression is done by SW, while the viewfinder is
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