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ADSP21469 SPDIF Rx and Tx latency

		
	
				

			

									
					    Hfuhruhurr
					
							

            
            			
				
									
											
			
			
				
			
			
			    	
			                    
                
				                on Feb 7, 2017 
				
			
			
		

		
		                    	    

        	    
Thread Summary

                The user is measuring a 3.5 sample delay at 48 kHz between two DSPs connected via SPDIF transmitter and receiver. The user has confirmed this latency through impulse response measurements with the SPDIF receiver and transmitter directly connected, and is seeking official documentation or confirmation of this delay. The user aims to minimize latency to synchronize the two DSPs.
                        	    

                
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Hi all,

 
I can't find any information on the signal delay that the SPDIF receiver and transmitter introduce.

 
I assume that the transmitter does not generate signal latency at all, however the receiver should.

 
So, let's assume the following:

 
DSP 1 generates a master clock, outputs a signal via ADCs and passes this signal via SPDIF transmitter to DSP2

 
DSP2 uses the recovered clocks and outputs the received signal via ADC.

 
Currently, I measure a delay of 3.5 samples at 48 kHz between these 2 analog signals.

 
But there should be any official information about this, shouldn't it?

 
Best regards,

 
Rainer

			

			
									
		                             
                        
		


				
				        
        		

			
						
									
												
			
			
                        
                                    
                        
                        
                        
            
			            
						
						
			
			
			
			
		


        
        
        
    
					

			





















	

	

					



			








	
	
	
	



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                on Feb 17, 2017 8:39 AM
            
            
						
			            		
    
		
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    Hi Jithul,
    
 
    I have a 21469, feed an AES signal into the SPDIF Receiver, connect DIR_FS_O, DIR_CLK_O, DIR_DAT_O and DIR_TDMCLK_O to the respective inputs of the SPDIF transmitter and grab the output by a measurement system.
    
 
    I, then measure the frequency resp. impulse response of this system.
    
 
    First, I do a reference measurement of my measurement system by connecting the AES output and input of the measurement system using a wire. Impulse response measurements using this wire, then, show a latency of zero.
    
 
    Then, I connect the DSP to the measurement system and measure the impulse response which shows a latency of 3,5 samples.
    
 
    Regards,
    
 
    Rainer
    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
				
						
						
				
				
		
		
    
			
		
    
	
    

    

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                on Feb 17, 2017 8:39 AM
            
            
						
			            		
    
		
										0
					
	
    

		
		
    
		
    
                                
                                                            
    
					
    Hi Jithul,
    
 
    I have a 21469, feed an AES signal into the SPDIF Receiver, connect DIR_FS_O, DIR_CLK_O, DIR_DAT_O and DIR_TDMCLK_O to the respective inputs of the SPDIF transmitter and grab the output by a measurement system.
    
 
    I, then measure the frequency resp. impulse response of this system.
    
 
    First, I do a reference measurement of my measurement system by connecting the AES output and input of the measurement system using a wire. Impulse response measurements using this wire, then, show a latency of zero.
    
 
    Then, I connect the DSP to the measurement system and measure the impulse response which shows a latency of 3,5 samples.
    
 
    Regards,
    
 
    Rainer
    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
				
						
						
				
				
		
		
    
			
		
    
	
    

    

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