The following is for BBS distribution. More information is available from John Rice via AV-SYNC BBS (404) 320-6202 or phone (404) 451-8438. TELECAST ENCRYPTION TECHNICAL SPECIFICATIONS The Telecast System is divided into (3) three groups, the Computer, Encoder and Decoder. The system offers a very secure signal by randomly time shifting the audio and randomly inverting the video. The randomness is designated by setting a pattern to follow. The system computer is used to enter the proper authorization codes for events to be shown. The Encoder generates a signal for authorization of the selected decoders, sent to the decoders before the main program is transmitted. Signal includes the Decoder Address, Key Codes, Service Codes and Program Codes; it is sent in the clear and looks like bar codes when viewed on television. The Encoder then encrypts both audio and video signals for uplink distribution. The Decoder decodes the information and processes the main program to separate audio and video outputs. The Encoder is divided into (2) two groups, the Scramble System and the Address Insertion System. The Scramble System contains the Audio Scramble Unit, Video Scramble Unit and Code Processor Unit. The Address Insertion System is comprised of the Address Insertion Unit, Address Data Control Unit and Communication Interface Unit. Both the audio and video are converted from analog to digital for scrambling and then returned to analog for distribution. The Encoder employs compensation and noise suppression circuits to prevent any transient spikes that may occur during the scrambling process. 컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� GENERAL SPECIFICATIONS SCRAMBLE METHOD VIDEO : Random polarity inversion AUDIO : Random time shift SUBSCRIBER ADDRESSING MAXIMUM ADDRESS : 1,219,584 Per Address Insertion System ADDRESS TIME : MINIMUM = 35 seconds to address 101,632 MAXIMUM = 6.5 min. to address 1,219,584 VIDEO SCRAMBLING UNIT SIGNAL SYSTEM : NTSC TV standard SCRAMBLE METHOD : Video polarity inversion SCRAMBLE TIMING : Scene change or image movement VIDEO INPUT : NTSC composite video, negative sync; the level = 1.0 Vp-p + or - 3db adjustable VIDEO OUTPUT : 0.822 Vp-p + or - 3db adjustable (75 IRE) Composite video, negative sync @ 75 Ohms BAND WIDTH : + or - 0.3db to 4.2 Mhz SIGNAL TO NOISE : 55db (UNWEIGHTED) DG : 2% DP : 2 degree COMMAND CODE and PEDESTAL REFERENCE PULSE LEVEL : 75 IRE INVERSION AXIS : 41.25 IRE SETUP LEVEL : 7.5 IRE AUDIO SCRAMBLING UNIT SCRAMBLE METHOD : Random time shift RESOLUTION : 16 bits linear FREQUENCY RESPONSE : +0.5, -1.0db at 30 to 15Khz DYNAMIC RANGE : More than 90db AUDIO LEVEL --- LINE IN : +2, +8dbm (selectable) LINE OUT : +2, +8dbm (selectable) MONITOR OUT : -5db IMPEDANCE --- LINE IN : 10k, 600, 150 Ohms (selectable) LINE OUT : 600, 150, 37.52 Ohm (selectable) MONITOR OUT : 600 Ohms FLICKER TEST : ON/OFF SCENE CHANGE : Detector has 8 selectable modes START CUE : Delay adjust = 0 - 9 seconds PRINTER OUTPUT : Equivalent to Centronix Interface Factory recommendation is SONY SMI-7020 ADDRESS DATA CONTROL UNIT MEMORY CAPACITY : 1,219,584 bits ENCRYPTION TIME : Approximately 100,000 bits/minute COMMUNICATION INTERFACE UNIT MEMORY CAPACITY : 1,219,584 bits COMMUNICATION --- PORT : EIA RS-232C PROTOCOL : IBM 3780 BSC transparent TIME : Host Computer to Inserter ---- 20 seconds for 101,632 bits @ 9600 baud The following is for BBS distribution. More information is available from John Rice via AV-SYNC BBS (404) 320-6202 or phone (404) 451-8438.6-80441200N81NV Illumi-Net377-11411200N81NV INDEX System II991-35691200N81NV Information Shoppe288-75351200N81NV InSight455-47071200N81NV ISIS446-69311200N81NV ISOPIA422-22501200N81NNa IT BBS of Atlanta471-88241200N81N++ JOBBS!992-89371200N81N++ Jodeco House478-77611200N81NV KASPER'S TI939-05261200N81NV Labyrinth ST (ESTSA)594-07001200N81NV Lair995-08471200N81NV LARC