• State Verified Answer
  • +1 person also asked this people also asked this
  • Replies 31 replies
  • Answers 1 answer
  • Subscribers 85 subscribers
  • Views 6422 views
  • Users 0 members are here
Options 

        

            Post
             Go back to editing
        

    

    


    

    









		


















	
	
			
	
			
		
	
	
		

		
EVAL-ADV7842-7511 Noise Interference lines

		            
		

			

									
					    Kencol
					
							


			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Jan 25, 2017 
				
			
			
		
    
		
     
				
		
    
		    		    
		    
		    	
			
    Hi, I have a EVAL-ADV7842-7511 Board which I'm using to decode CVBS signal from a Laserdisc player.
    
 
    I have an issue where I'm seeing faint diagonal lines across the image. These are present on all of the input formats 10Bit, 24Bit and 36Bit and is also present on the s-video input. 
    
 
    It it looks almost like interference. I've tried multiple cables and players and all produce the same results.
    
 
    Any idea what is causing this?
    
 
    many thanks
    
 
    ken
    
									
			        
		
    

				
						
        

		
    
			
						
									
												
			
			
                        
                                    
                        
                        
                        
            
			            
						
						
			
			
			
			
		
    

        
        

					
    
			
    


    
















    
	
    
	
    
					



			








	
	
	
	



Parents
	
      
	

    • 
	
      



	
		
	
	



      
	
      
		
      
							FormerMember
					
      
		
      
			
													0
							
			
				
									FormerMember
							        
			
			
			
    
            
						
                            
            
            				
            
                on Jan 27, 2017 1:23 PM
            
                                    
					
    
	
    

		
		
    
					
    You can connect to the ports via a terminal emulator.  We use TeraTerm set for 115kbaud, 8bit no parity.  All commands are just plain ascii text strings.  Enter 'help' to get the list.
    
 
    The -5P board does not start the repeater software at power up.  It was meant to be script driven.  You can enter 'startrep' to get it going.
    
 
    I'm not sure what's really going on here.  We don't see those type of lines.  The UK is a 50Hz country, I am wondering if there is some kind of beat frequency going on since you see the same problem with a DVD player.  Can you do a quick check with all the lights off in the room.  LED and fluorescent lamps can sometimes flicker at the power frequency.  The eye doesn't see it but a beat frequency between the TV and lamps might introduce weird line.  This is just a quick and easy check to rule that out.
    
 
    Also you say the the lines aren't there when the 3D comb filter is turned off.
    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
				
						
				
				
		
		
    
			
		
    
	
    

    


	



Reply

      


    • 
	
      



	
		
	
	



      
	
      
		
      
							FormerMember
					
      
		
      
			
													0
							
			
				
									FormerMember
							        
			
			
			
    
            
						
                            
            
            				
            
                on Jan 27, 2017 1:23 PM
            
                                    
					
    
	
    

		
		
    
					
    You can connect to the ports via a terminal emulator.  We use TeraTerm set for 115kbaud, 8bit no parity.  All commands are just plain ascii text strings.  Enter 'help' to get the list.
    
 
    The -5P board does not start the repeater software at power up.  It was meant to be script driven.  You can enter 'startrep' to get it going.
    
 
    I'm not sure what's really going on here.  We don't see those type of lines.  The UK is a 50Hz country, I am wondering if there is some kind of beat frequency going on since you see the same problem with a DVD player.  Can you do a quick check with all the lights off in the room.  LED and fluorescent lamps can sometimes flicker at the power frequency.  The eye doesn't see it but a beat frequency between the TV and lamps might introduce weird line.  This is just a quick and easy check to rule that out.
    
 
    Also you say the the lines aren't there when the 3D comb filter is turned off.
    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
				
						
				
				
		
		
    
			
		
    
	
    

    





Children
	
    No Data