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How could I measure the delay of an external analog loopback on ADZS-SC584-EZLITE board?



		

			

									
						Embedded_AI_engineer
					
							

			
				
									
											
							 		
		        	            							
			
			    	
			                    
                
				                on Nov 23, 2021 
				
			
			
		


				
		

		    		    
		    
		    	
			
Hi ADI experts,


Now I'm developing ANC solution based on the ADC DAC playback SC589 example codes on ADZS-SC584-EZLITE board.


And I have two questions.


1) How could I measure the delay of an external analog loopback (from RCA audio output to RCA audio input) on ADZS-SC584-EZLITE board?


-> Could I estimate the delay using correlation? 


2) How could I minimize the delay of an external analog loopback (from RCA audio output to RCA audio input) on ADZS-SC584-EZLITE board? 


-> Do I need to modify AUDIO_BUFFER_SIZE to a smaller size in the adc_dac_playback.h file of the ADC DAC playback example?


Thanks for your support!


Kim

								


				
				
		

			
						
									
									
						
						
			
			
			
			
		


					

			





	










	

	

					



			


				
	









	
    
	

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                                 Analog Employees 
                                
                            
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                on Nov 26, 2021 9:07 AM
            
            
					
    
	
    

		
		
    
					
    Hello Kim,
    

    ADC DAC playback SC589 example code makes use of two buffers to receive the input data. Hence the equivalent net delay is time required to fill/write two buffers.
    

    So for a block size of 1024 and the sampling rate of 48Khz:
    The time per frame will be (1/48KHz)= 20.83 micro seconds.
    Total net delay will be 20.83 * 1024 * 2= 42.659 msec.
    

    By reducing the BLOCK Size, latency will also be reduced.
    

    Best Regards,
    Santhakumari.K
    
			
    

		
		
		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
				
						
						
				
				
		
		
    
			
		
    
	
    

    

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