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CL680 VIDEO-CD DECODER
SINGLE-CHIP AUDIO/VIDEO/CD-ROM DECODER WITH INTEGRATED
NTSC/PAL ENCODER
The CL680 VideoCD Decoder is a highly integrated MPEG-1 system decoder for VideoCD
players.
• Higher Integration: The CL680 has an integrated digital NTSC/PAL encoder, eliminating
the need for a discrete device and reducing total design footprint. Stereo key control and
vocal fade features replace additional audio circuitry in Karaoke applications. No other
single-chip decoder on the market can match the CL680’s level of integration.
• Enhanced Quality: The CL680 incorporates WideSound™, C-Cube’s proprietary audio
technology that provides a surround sound experience in stereo applications. Also, the
OSD feature has been enhanced to display more on-screen characters.
• Greater Reliability: C-Cube’s ClearView™ technology, introduced on the CL484, has been
further enhanced in the CL680. VideoCD players based on the CL680 play more types of
media and have fewer visible flaws than ever.
The CL680’s microcoded architecture enables OEMs to retain their engineering investment
in hardware and system software from their CL484 designs. CL680-based designs can be
upgraded to add new features as the CL680 product line evolves without changing the
hardware design.
CD Data
RF, CD-DSP
& Servo
Host
Front Panel
CL680
MPEG Decode
NTSC/PALEncode
WideSound™
Key Control
OSD
CD-G Decode
4-Mbit
DRAM
ROM
Low-Pass
Filter
Low-Pass
Filter
Audio
DAC
Digital
Echo
Composite
Video
S-Video
Stereo
Audio

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AUDIO FEATURES
The CL680 VideoCD Decoder integrates audio features
to provide increased functionality and value to con-
sumers without increased system cost.
WIDESOUND
C-Cube's audio algorithms use advanced DSP tech-
niques to expand the perceived sound field with stan-
dard stereo sound tracks.
ERROR HANDLING TECHNOLOGY: Errors that the CD-DSP
can detected but not correct can be corrected by
ClearView. These errors include both header and pic-
ture (data) errors. ClearView identifies the error type,
classifies it, and uses the best possible strategy for
error concealment.
COMPATIBILITY: ClearView ensures complete compliance
with the entire MPEG-1 standard, so that the CL680
can flawlessly play back VideoCDs that have been
encoded in a variety of styles. ClearView plays back
most VideoCD formats, including VideoCD 1.1 and
2.0, KaraokeCD, OM-1 and CD-I.
KEY CONTROL
Key control is a standard feature in most Karaoke
products. The CL680 changes the pitch of the mono or
stereo audio track n single quartertone increments,
eliminating the need for a separate DSP for Karaoke.
VOCAL FADE
By comparing the left and right channels, the CL680
attenuates the vocal component of a stereo program.
This feature allows VideoCDs and standard CD-DA
recordings to be used for Karaoke and accommodates
non-standard video Karaoke titles.
VIDEO FEATURES
In addition to its extensive audio processing capabili-
ties and features, the CL680 offers unique video fea-
tures that provide consumers added utility compared
to a standard VideoCD player.
CLEARVIEW
The result of over 20 man-years of engineering effort,
ClearView sets the standard for reliable, clear video. C-
Cube’s ClearView technology, first introduced on the
CL484, has been further enhanced on the CL680.
These enhancements include:
DISCVIEW
This feature provides PlayBack Control (PBC) capabili-
ty with VideoCD 1.1 discs by displaying up to nine
images on the TV screen to form a video menu. The
CL680 can read images from each track on a single
disc or from multiple discs to provide a playback con-
trol menu, or images can be from a single track to pro-
vide chapter access menus.
FLEXVIEW
The CL680's FlexView feature converts NTSC source
material to PAL format to provide full-screen, correctly
proportioned displayed video. FlexView uses C-Cube's
adaptive interpolation technology for smooth, raster-
free scaling.
It also converts coded frame rates of 24 (film), 25 (PAL)
or 30 (NTSC) Hz to NTSC or PAL display rates (60 or
50 Hz).
C-Cube Microsystems

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ZOOM
The CL680 incorporates hardware to enable stills or
motion pictures to be magnified in a selected area of
the screen.
GRAPHICS FEATURES
The CL680 incorporates an advanced graphics engine
that allows VideoCD player designers to display player
status on the television screen and to support graphic
enhanced CD formats such as CD-G.
ON-SCREEN DISPLAY (OSD)
The CL680 provides the ability to display user-defined
graphics (stored in ROM) over real-time video. The
CL680 allows graphics to be displayed anywhere on
the TV screen, and it supports both run-length com-
pressed and bitmap images. To ease the development
of OSD characters, C-Cube provides a font-conversion
utility, which allows designers to easily run-length
encode any bitmap font for storage in the CL680's
ROM.
CD-G SUPPORT
The CL680 provides on-chip support for the CD-G (CD
audio plus graphics) format extension to the Red Book
(Compact Disc Digital Audio) standard.
INTEGRATION FEATURES
The CL680 family is designed to reduce system cost by
incorporating more VideoCD functions and providing
glueless interfaces to other system elements.
INTEGRATED DIGITAL NTSC/PAL ENCODER
The CL680 includes a digital NTSC/PAL encoder with
S-Video (Y/C) and composite outputs (9-bit resolution)
and excellent signal separation for a superior picture.
IMPROVED DRAM USAGE
The CL680 supports PAL and NTSC including high-
resolution stills with only 4 Mbits of 70-ns DRAM.
More efficient use of DRAM provides twice as much
DRAM space to store user-defined OSD.
INTELLIGENT INTERFACE DESIGN
The CL680 provides glueless interfaces to the CD-DSP,
DRAM, ROM, and audio DACs. Support for all
VideoCD and MPEG standards (including Video CD 2.0
and 1.1, Karaoke CD 1.0 and CD-I Green Book) means
that no external parsing is required.
PACKAGING
The CL680 requires a design-friendly three-volt supply
and consumes less than one watt during decoding. In
addition, it automatically reduces power consumption
when decoding CD-DA. The CL680 can accept 5-volt
inputs.
Like the CL48x family, the CL680 is packaged in a
128-pin small-outline PQFP (18mm x 18mm body
size).
C-Cube Microsystems

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© C-Cube Microsystems, 1999. All rights reserved. Printed in USA
Part Number: 90-0680-201
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