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???
07/13/06 09:16
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 		 #120163 - TV sync
Responding to: ???'s previous message
Indeed they were. The UK 405-line system vertical scan rate (and hence the line scan frequency) was synchronised to the National Grid mains frequency. This had to stop with the 625-line system when a colour sub-carrier that had to be accurately controlled was introduced. By that time, TV set designers had got better at eliminating mains picture modulation effects. (They'd mostly gone transistor, which helped...)
Dave

List of 32 messages in thread
TopicAuthorDate
Guide line requried for 24 bit adc            01/01/70 00:00      
   essential            01/01/70 00:00      
   And of course ...            01/01/70 00:00      
   high precision!!            01/01/70 00:00      
      Why ?            01/01/70 00:00      
         Averaging ...            01/01/70 00:00      
            Random drift            01/01/70 00:00      
               True, but ...            01/01/70 00:00      
                  24bit accuracy can never be achieved            01/01/70 00:00      
                     Cirrus Logic ADCs            01/01/70 00:00      
                        Cirrus Logic ADCs part no ?            01/01/70 00:00      
                        Hysteresis            01/01/70 00:00      
                           Cirrus Logic.            01/01/70 00:00      
                              Mains beat            01/01/70 00:00      
                                 OT: mains beat on ancient TVs            01/01/70 00:00      
                                    TV sync            01/01/70 00:00      
         the point is            01/01/70 00:00      
            apart from getting it to work            01/01/70 00:00      
               For instance...            01/01/70 00:00      
      What it says in the datasheet            01/01/70 00:00      
         That's the Key!            01/01/70 00:00      
            And how will you verify...            01/01/70 00:00      
   adc            01/01/70 00:00      
      Example            01/01/70 00:00      
         And..            01/01/70 00:00      
      Availability != General Requirement            01/01/70 00:00      
         Cirrus Logic ADCs part no ?            01/01/70 00:00      
            i got curious            01/01/70 00:00      
   Have a look at this            01/01/70 00:00      
      marketing lingo            01/01/70 00:00      
         From the datasheet:            01/01/70 00:00      
            When is good enough            01/01/70 00:00      

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