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`APPLICATION NOTES
`
`CSX DIGITAL SIGNAL PROCESSING
`
`CompuSonics Video's CSX digital signal processing can be applied to a wide variety of
`consumer. industrial. and professional digital video products. CSX dramatically reduces
`the amount of data required to record or broadcast the digital video/audio signal.
`Therefore. the cost/performance ratio of digital video products may be improved
`substantially by incorporating CSX signal processing In product design.
`
`These notes suggest a few of the many new or improved products which are possible
`using CSX. CSX hardware and software may be licensed from CompuSonics Video by
`manufacturers interested in developing these and other products. Custom hardware
`and software development and integration is also available on a contract basis.
`
`Home Video Recorder/Editor
`
`The home video editor is a disk-based video recorder capable of recording from any
`standard video source such as a home VCR or video camera. Once the source
`material has been selected and recorded onto disk. the editing functions allow the user
`to select and rearrange specific video segments arbitrarily. The resulting edited video
`may be played directly from disk for viewing. or dubbed ~ack to VCR tape. This gives
`consumers the capability to consolidate and edit their home video recordings for future
`enjoyment.
`
`Using CSX. several minutes of video/audio material can be edited with inexpensive.
`high capacity floppy disks (12 Mb or more). Altematively. disks with capacities of 100
`Megabytes or more (such as recordable optical disks currently available) yield more
`than an hour of recording.
`
`Video Database Computers
`
`The video database computer is a disk-based random-access video storage and
`retrieval system. Video/audio segments or ·records· are recorded onto the disk in any
`order. These records may then be played back in any desired order.
`
`For example. one proposed product for the travel industry allows a client to peruse the
`sights and sounds of several prospective vacation spots before making a choice. The
`client inserts a disk corresponding to the area of Interest. and then either watches the
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`entire disk or selects search keys to show only those pOints of specific interest tor
`viewing.
`
`A similar application of the video database computer is in real estate. A home buyer
`plays a disk containing video/audio segments showing and describing the various
`rooms and surrounding property of a house for sale. Both the real estate and travel
`database applications are possible using inexpensive floppy disks and CSX encoding.
`allowing instant random access arId replay.
`
`Another database-oriented product incorporating CSX could reduce credit card abuse
`with picture and voice verification at a pOint of sale display terminal. An extensive
`customer database containing video/audio records and other data is easy to update
`and maintain using magnetic fixed disk drives and CSX enCoding for effiCient storage
`and retrieval. Currently available dial-up high speed data lines such as AT&T's Accunet
`can cost effectively connect paints of sale to the database computer for ID verification.
`
`Multimedia Computers
`
`A multimedia computer stores and manipulates text. numeric data. graphics, moving
`pictures. and sound. Digital video/audio material may be stored on the computer's
`main disk or on a peripheral. such as a CD-ROM. CSX makes it possible to store up to
`seven hours of video/audio material on a ·single CD-ROM.
`
`CSX can be applied to video/audio electronic mall. electronic encyclopedias. and
`other multimedia computer functions. Any time video and audio are stored. retrieved.
`or transmitted by computers. CSX makes It less costly and more efficient.
`
`Music Video Distribution
`
`MusiC television has become a key component of the entertainment industry. Presently,
`music television serves primarily as a means of promoting sales of records. cassettes,
`and compact discs. A small but increasingly significant number of consumers are also
`purchasing music videos in videotape format. Although the video may be recorded off
`the air or cable using a VCR. the resulting video and audio fidelity of the copy is poor.
`Digital mUSiC video distribution offers customers two significant benefits: high fidelity
`digital audio and video. and convenient purchasing via electronic distribution directly to
`the home.
`
`The proposed music video distribution chain has three principle components that
`depend on CSX teChnology: a video database computer. a broadcast digital
`encoder. and a home disk-based digital video decoder/recorder. A consumer
`enjoying music television who chooses to purchase his own digital copy calls the
`distributor with his request. The distributor enables the video database computer to
`access the consumer's !:election and transfer the video/audio data to the broadcast
`digital encoder. This encoder modulates the data onto a cable television subcamer
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`or other transmiSSion format. The home decoder/recorder receives the digital
`video/audio data over the cable link and copies it to disk.
`
`At a CSX data rate of about 1 megabit per second. up to ten digital video/audio signals
`may be broadcast simultaneously over a single cable television channel. A home
`digital decoder/recorder using currently available 400 megabyte write-once optical
`disks would capture and store about one hour of CSX format digital music video material
`permanently.
`
`Video Surveillance System
`
`Video monitoring and recording systems are used In banks. stores. office buildings.
`airports. or other locations requiring security and constant surveillance. Video cameros
`which are situated in strategic locations. such as an airport security gate. pr~vlde a
`video image which may be viewed remotely. Recording the video signal provides a
`reference which may be reviewed at a later time. For example, if an airtine flight has just
`been hijacked, an instant video replay reviewing those people who entered the gate
`before the flight may provide information regarding the suspected hijacker's identity.
`
`There are several important elements to a video surveillance recording system: tast
`access to arbitrary recorded time points, long recording capacity, and minimal
`operating maintenance. While tape-based systems may provide long record times.
`fast access to arbitrary locations Is tedious. and tapes constantly need to be replaced
`as they wear out. A high capacity computer disk-based system provides instant
`access to recorded locations and virtually no operating maintenance. A further
`advantage of a disk-based system is the ability to re-use the recording media by
`automatically recording over the oldest. unwanted material.
`
`CSX makes the disk-based surveillance video recorder possible by dramatically
`reducing the enormous disk storage capacity which would otherwise be required. At a
`CSX rate of 100 kilobits per second. a 540 megabyte magnetic disk could continuously
`record and store twelve hours of video/audio material. The image and sound of any
`event recorded by the camera and microphone during the preceding twelve hour
`window may be accessed instantly using the computer's random access capability.
`
`Electronic Shopping
`
`Most consumer product catalogs are four color printed documents. These publications
`are seasonal. and usually are disposed of by the consumer soon after their distribution.
`High quality shopping catalogs are both expensive to produce and distribute. An
`electronic replacement for this type of sales literature could take two forms: on on-line
`database accessed via teletext on conventional computer networks. or audio/video
`floppy disks.
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`The efficiency of on-line shopping services can be improved by CSX, Reduction in
`database storage and download bandwidth requirements are especially important for
`audio, graphic Image and motian image product presentations, Existing video
`shopping services are limited by bandwidth requirements which restrict the number of
`shoppers who can be on-line simultaneously. In addition, the high cost of digital storage
`can be reduced by CSX encoding of the product database.
`
`An alternative approach to electronic shopping is to distribute the audio/Video
`information on floppy disk. Floppies are inexpensive, easy to mail. and provide random
`acoess capability. Product information can be indexed. assisting the shopper to locate
`quickly an item of particular interest.
`
`Computer-Aided InstrucHon
`
`Educators are Increasingly interested in providing audio/video learning tools to be used
`In conjunction with personal computers. The computerized language laboratory can
`make effective use of random access disks that allow students to interact on a
`personalized basis with the instructional program. A recordable random access digital
`storage medium such as floppy disk lets the student record his own voice in parallel with
`the teacher's voice and in synchronization with the complementary video images.
`
`Computer aided instruction has also been employed extensively in commercial and
`industrial training. CSX video/audio data stored on disk provides both the hierarchial
`structure and random access required for rapid trainee interaction. Technical training is
`enhanced by the ability of CSX based systems to freely mix audio. video. graphic and
`text information throughout the curriculum. Automatic monitoring of the trainee's
`responses and queries can facilitate the supervisor's management of the training
`process.
`
`CompuSonlcs Video
`2345 Yale Street
`Palo Alto. CallfomiO 94306
`(415) 494- 1208
`
`© Copyright 1986 CompuSonlcs Video Corp.
`
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