Products Mentioned

ADAU1451 Production
The ADAU1452 / ADAU1451 / ADAU1450 are automotive qualified audio processors that far exceed the digital signal processing capabilities of earlier SigmaDSPÂ...
Datasheet
ADAU1451 on Analog.com

Thread Details

  • State Verified Answer
  • Replies 10 replies
  • Subscribers 73 subscribers
  • Views 4632 views
  • Users 0 members are here 

        

            Post
             Go back to editing
        

    

    


    

    









		


















	
	
			
	
			
		
	
	
		

	    
	    
	    		
Karaoke key change using ADI pitch transposer alogrithm

		
	
				

			

									
					    jimyam
					
							

            
            			
				
									
											
			
			
				
			
			
			    	
			                    
                
				                on May 31, 2017 
				
			
			
		

		
		                    	    

        	    
Thread Summary

                The user asked about implementing a key change function for a karaoke machine using the ADAU1451 and the ADI pitch transposer algorithm. The final answer explained that the standard pitch transposer causes vibrato due to splices in the circular buffer and suggested using a Lookup Table (LUT) to achieve +/-4 semitones pitch change, with the LUT values determined empirically. The user also inquired about evaluating base10 labs' advanced pitch shifter and whether the ADI pitch transposer uses PSOLA, to which the engineer confirmed the potential need for a custom developer for better performance and that the ADI pitch transposer likely uses a PSOLA-like method.
                        	    

                
                     AI Generated Content
                
    	    

             
				
        		

		    
		    		    
		    			

			    
Hi,

 
I would like to implement the key change function for a karaoke machine using ADAU1451.

 
I tried the ADI pitch transposer algorithm for the key change function.

 
First, I don't know how to set the parameters  'Delay Reserved', 'Frequency Shift Slider', and 'Max Shift' to achieve +/-4 semitones pitch change. The information in the wiki Analog Devices doesn't show clearly how to set those parameters.

 
https://wiki.analog.com/resources/tools-software/sigmastudio/toolbox/adialgorithms/pitchmodification/pitchtransposer

 
Second, I set 'delay reserved' to 1000, while the 'max shift' is 100. I can heard obviously that the volume does not keep stable, like vibrato effect . Can it be more stable?

 
Thanks in advance!

 
Jim.

			

			
									
		                             
                        

    

                                            
                 Audio Signal Processors
                
                                                    
                 adau1451
                
                                                    
                 SigmaDSP Audio Processors
                
                                
            

    
    
		


				
				        
        		

			
						
									
												
			
			
                        
                                    
                        
                        
                        
            
			            
						
						
			
			
			
			
		


        
        
        
    
					

			





















	

	

					



			








	
	
	
	



Parents
	
    
	

  • 
	
    



	
		
	
	



    
	
    
		
    
							
					
    
		
    
		    
		    		    
			
				
									
							        
			
			
			
            
						
                            
            
            				
            
                on Jun 1, 2017 9:20 AM
            
            
						
			            		
    
		
										0
					
	
    

		
		
    
		
    
                                
                                                            
    
					
    Hello Bob,
    
 
    Thanks a lot for your help. The SigmaDSP project is very useful.
    
 
    From you table, I can get more information about how to calculate the control input. I notice that the frequency shift is dependent on the "Delay Reserved".  Can you help to clarify how to calcuate the LUT output? Is the LUT output  calculated using the following equation?
    
 
    LUT output=(delta pitch %)/(sample frequency*Delay Reserved/1000)
    
 
    If we would like to evaluate base10 labs advanced pitch shifter, how can we get the trial version of the algorithm?
    
 
    Also thanks for you suggestions about that singers should pick songs with their range.
    
 
    With best regards,
    
 
    Jim.
    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
				
						
				
				
		
		
    
			
		
    
	
    

    

    • 

	




Reply

    


  • 
	
    



	
		
	
	



    
	
    
		
    
							
					
    
		
    
		    
		    		    
			
				
									
							        
			
			
			
            
						
                            
            
            				
            
                on Jun 1, 2017 9:20 AM
            
            
						
			            		
    
		
										0
					
	
    

		
		
    
		
    
                                
                                                            
    
					
    Hello Bob,
    
 
    Thanks a lot for your help. The SigmaDSP project is very useful.
    
 
    From you table, I can get more information about how to calculate the control input. I notice that the frequency shift is dependent on the "Delay Reserved".  Can you help to clarify how to calcuate the LUT output? Is the LUT output  calculated using the following equation?
    
 
    LUT output=(delta pitch %)/(sample frequency*Delay Reserved/1000)
    
 
    If we would like to evaluate base10 labs advanced pitch shifter, how can we get the trial version of the algorithm?
    
 
    Also thanks for you suggestions about that singers should pick songs with their range.
    
 
    With best regards,
    
 
    Jim.
    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
				
						
				
				
		
		
    
			
		
    
	
    

    

    • 





Children
	
No Data


		
			








		

		

			
    
				
  • 
					
												
						
						
						
						
						
						
						

																										
						
						

					
					
					
				
    • 
			

		

	








































     



















		        
        

            
Before You Switch

            
        

        

        

            Switching languages will make ADI Explorer unavailable. Resume your session by switching back to English and reopening ADI Explorer.