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Sync SPDIF Tx rate to SPDIF Rx rate

		
	
				

			

									
					    PhilipJ
					
							

            
            			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Oct 30, 2015 
				
			
			
		
    
		
		                     
				
        		
    
		    
		    		    
		    			
    
			    
    Hi,
    
 
    I am planning a new product to use a SigmaDSP, the majority of the input/output will be analog (8 channel TDM converters). I will also use the SPDIF input as an extra stereo channel and I want to use the SPDIF output as a secondary output.
    
 
    I can't run the core from the SPDIF input rate as it might not always be active, I will therefore present the SPDIF Rx to the core through an ASRC.
    
 
    Now my problem, I want the SPDIF Tx active all the time but I want it to run in sync with the SPDIF Rx if it is there so:
    
 
    how do I setup the SigmaDSP to feed an ASRC from the core and it's output to the SPDIF Tx?
    
 
    Can I set the ASRC output rate to come from the SPDIF Rx?
    
 
    What might happen to the Tx rate when I remove the signal from the Rx?
    
 
     
    
 
    Thanks for any thoughts
    
 
    PhilipJ
    
			
    
			
									
		                             
                        
		
    

				
				        
        		
    
			
						
									
												
			
			
                        
                                    
                        
                        
                        
            
			            
						
						
			
			
			
			
		
    

        
        
        
    
					
    
			
    


    
















    
	
    
	
    
					



			








	
	
	
	



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                on Mar 10, 2016 11:37 AM
            
            
						
			            		
        
		
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        Hi,
        
 
        sorry for the long delay, the project got put to one side for a while but I now have the prototype board to start work on.
        
 
        I am using the ADAU1442.
        
 
        I plan to try the following, the SPDIF TX will run at the core rate as you describe, this will connect to the SPDIF RX of another ADAU1442 (in a seperate box or I would just use I2S) and the RX will be fed through an SRC since I can't lock the cure speeds of the two boxes together.
        
 
        This has slightly modifed by original plan I may have problems with the ASRC group delay but I shall have to try it and see what happens.
        
 
        Thanks for the comprehensive analysis and suggestions
        
 
        regards
        
 
        PhilipJ
        
			
        

		
			
	      

		
		
	
        
	
        
		
        
			
		
        
	
        
	
        
		
						
						
				
						
				
				
		
		
        
			
		
        
	
        

        

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                on Mar 10, 2016 11:37 AM
            
            
						
			            		
          
		
										0
					
	
          

		
		
          
		
          
                                
                                                            
          
					
          Hi,
          
 
          sorry for the long delay, the project got put to one side for a while but I now have the prototype board to start work on.
          
 
          I am using the ADAU1442.
          
 
          I plan to try the following, the SPDIF TX will run at the core rate as you describe, this will connect to the SPDIF RX of another ADAU1442 (in a seperate box or I would just use I2S) and the RX will be fed through an SRC since I can't lock the cure speeds of the two boxes together.
          
 
          This has slightly modifed by original plan I may have problems with the ASRC group delay but I shall have to try it and see what happens.
          
 
          Thanks for the comprehensive analysis and suggestions
          
 
          regards
          
 
          PhilipJ
          
			
          

		
			
	      

		
		
	
          
	
          
		
          
			
		
          
	
          
	
          
		
						
						
				
						
				
				
		
		
          
			
		
          
	
          

          

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