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6221 The selectable converter was placed between the cable drop and the television receiver and appeared on top of or near the TV set Some of these converters also had a ne-tuning control that often confused the subscriber with the television tuning system and the converters Mistuning problems caused many cable operators a lot of expensive subscriber service calls 6222 Signal security with this type of converter was done as before, by using either positive or negative traps as required Actually, this type of converter did little for the cable operator and in many instances caused more problems than it solved
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The electronic programmable converter was introduced when signalscrambling methods were developed Signal scrambling of the premium pay channels was done at the cable system headend, and it was the job of the converter to unscramble the signals at the subscriber s TV set The rst generation of this type of converter used a PROM chip with the decode logic permanently burned into this chip Cable operators could order from suppliers the preprogrammed chips or could program their own using a PROM programmer, often referred to as a PROM burner It did not take long for pirate chip operators to appear, allowing unauthorized use of a cable system s premium pay channels This converter contained the descrambling circuits that would descramble channels authorized by the PROM chip Again, channel selection was performed by the converter and translated to a low VHF channel, usually channel 3 or channel 4 This made the TV set s remote control useless Because many subscribers wanted remote control, cable converters with remote controls became available Now subscribers had two remote controls, and one was useless The relationship between the consumer electronics industry and the cable system operator as well as the subscriber had not improved 6231 Signal-scrambling methodology was in the beginning quite simple and effective Removing the horizontal synchronization pulse caused TV sets to lose synchronization, destroying the picture, yet the audio signal was not disturbed In order to remove the horizontal synch pulse, the scrambling circuit had to nd it This is actually quite easy at the circuit level and at each sync pulse interval a circuit shorted it out to ground level (0 v), thus removing its presence from the video signal Actually, this was
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done at the video IF inside the scrambler at the headend In the converter, the reverse procedure was performed on command from the programmed PROM, thus restoring the synch pulse One of the problems with this converter is they could walk, meaning it could be moved to another location and be used with any TV set 6232 The authorization and security control remained with the PROM By using the PROM programmer, some cable systems tried to use more complicated authorization codes Still, for many systems, the signal thieves just became more inventive Many manufacturers of cable converters worked with cable operators to try to keep up with the theft-of-service problem
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The addressable-type converter seemed to solve some of the security problems It had an exclusive code for the subscriber programmed into its PROM Each converter had to have this code refreshed at predetermined intervals or the converter would shut down and cease operating Also, the information for the selected channels to decode was transmitted on the downstream data signal along with the address data This data stream was transmitted just above the FM band using FSK-type modulation This type of converter allowed a subscriber to call the cable customer of ce and order a change-in-pay service The controlling computer, which was also usually a part of the billing system, would select the subscriber code and change the decode instructions for the desired channel and delete any others from the service This, of course, was a savings to the cable operator because a technician did not have to physically go to the subscriber s home since the changes would be made in the of ce 6241 Converters shipped from the factory to a cable operator had to be initialized before being placed in service at a subscriber s home This initialization process could be done quickly if the control computer was tted with a bar code reader If not, the converter identi cation number could be entered on the keyboard Manufacturers of addressable converters supplied the control software to the cable operators This software was used to program the controlling computer, which in turn controlled the converters out in the eld During the initialization process, the subscriber s identi cation code number was assigned and added to the database along
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