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ADV7842 Recommended for New Designs
The ADV7842 is a dual HDMI 1.4 fast switching rReceiver with 12-Bit, 170 MHz video and graphics digitizer and 3D comb filter decoder. It is a highly flexible...
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ADV7842 on Analog.com

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ADV7842 3D_Comb(TBC=Off) , Output picture has small waving noise issue at CVBS input.



		

			

									
					    Bogey
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Nov 5, 2012 
				
			
			
		
    

				
		
    
		    		    
		    
		    	
			
    Hello,
    
 
    When I start 3D_Comb function, Output picture has small waving noise issue at when I used CVBS input.
    
 
    However, this issue doesn't happen when I used Y/C input.
    
 
    also, when I stopped 3D_Comb, this issue disappear even I used CVBS input.
    
 
    System contens 
    
 
    3D_Comb = On
    
 
    TBC=Off
    
 
    64Mb SDR
    
 
    It seems this issue is relating 3D Comb function.
    
 
    How can I fix this?
    
 
    Regards,
    
 
    Bogey
    
									
			        
		
    

				
				
		
    
			
						
									
									
						
						
			
			
			
			
		
    

        
        

					
    
			
    


    


	















    
	
    
	
    
					



			








	
	
	
	



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      •  Analog Employees  
      
            
			                            
                        
                on Nov 21, 2012 4:33 PM
            
            
					
      
	
      

		
		
      
					
      Hi Bogey,
      
 
      I think 3D comb filter is enabled on all of the following scripts:
      
 
      * :1-1a CVBS NTSC_PAL-M  480i H_V_DE 10bit out HDMI:
      
 
      * :1-1c CVBS NTSC_PAL-M  480i H_V_DE 24bit 422 out HDMI:
      
 
      * :1-1d CVBS NTSC_PAL-M  I_P 480p H_V_DE 24bit 422 out HDMI:
      
 
      * :1-1e CVBS NTSC_PAL-M  480i H_V_DE 36bit 444 out HDMI:
      
 
      * :1-1f CVBS NTSC_PAL-M  480p I_P H_V_DE 36bit 444 out HDMI:
      
 
      If you see the noise in all of these script, it may be useful to use the SW driver to get into good situation, then start the AVES2 software, and save all of the registers for ADV7842 and ADV7511.
      
 
      Then you can do the same for one of the scripts and compare.
      
 
      -Matt
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
				
						
						
				
				
		
		
      
			
		
      
	
      

      

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													0
							
			
				
									
							        
			
			
			
      •  Analog Employees  
      
            
			                            
                        
                on Nov 21, 2012 4:33 PM
            
            
					
      
	
      

		
		
      
					
      Hi Bogey,
      
 
      I think 3D comb filter is enabled on all of the following scripts:
      
 
      * :1-1a CVBS NTSC_PAL-M  480i H_V_DE 10bit out HDMI:
      
 
      * :1-1c CVBS NTSC_PAL-M  480i H_V_DE 24bit 422 out HDMI:
      
 
      * :1-1d CVBS NTSC_PAL-M  I_P 480p H_V_DE 24bit 422 out HDMI:
      
 
      * :1-1e CVBS NTSC_PAL-M  480i H_V_DE 36bit 444 out HDMI:
      
 
      * :1-1f CVBS NTSC_PAL-M  480p I_P H_V_DE 36bit 444 out HDMI:
      
 
      If you see the noise in all of these script, it may be useful to use the SW driver to get into good situation, then start the AVES2 software, and save all of the registers for ADV7842 and ADV7511.
      
 
      Then you can do the same for one of the scripts and compare.
      
 
      -Matt
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
				
						
						
				
				
		
		
      
			
		
      
	
      

      

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