sound sample rate resampling

Hi florinsuciu, :-)

You can try using Bresenham variation like this one:

-------8<-------cut-here-------Bresenham.java-------
public class Bresenham
{
    public static void main( String[] args )
    {
        int[] sourceSample = {1,2,3,4,5,6,7};
        // int[] sourceSample = {1,1,2,2,3,4,4,5,6,6,7,8};
       
        int sourceRate = 32000; // 48000
        int targetRate = 48000; // 32000
       
        int targetLength = (sourceSample.length * targetRate) / sourceRate;
        int[] targetSample = new int[targetLength];
       
        int measure = targetRate;
       
        int sourceIndex = 0;
        int targetIndex = 0;
       
        while (targetIndex<targetLength)
        {
            if (measure>=sourceRate)
            {
                targetSample[targetIndex++] = sourceSample[sourceIndex];
               
                measure -= sourceRate;
            }
            else
            {
                sourceIndex++;
                measure+= targetRate;
            }
        }
       
        System.out.print( "[" );
        for (int i=0; i<sourceSample.length; i++)
        {
            System.out.print( sourceSample[i]+"; " );
        }
        System.out.println( "]" );
       
        System.out.print( "[" );
        for (int i=0; i<targetSample.length; i++)
        {
            System.out.print( targetSample[i]+"; " );
        }
        System.out.println( "]" );
    }
   
} /* Bresenham */
-------8<-------cut-here-------Bresenham.java-------

This should work both ways from lower SR to higher and vice versa.

Example (input 32000 output 48000) :

[1; 2; 3; 4; 5; 6; 7; ]
[1; 2; 2; 3; 4; 4; 5; 6; 6; 7; ]

Example 2 (input 48000 output 32000) :

[1; 1; 2; 2; 3; 4; 4; 5; 6; 6; 7; 8; ]
[1; 2; 3; 4; 5; 6; 7; 8; ]

What I have done there is 'stretch' the sample data.

I hope that this solves your problem. :-)

Greetings,
    </ntr> :)

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guanwz

florinsuciu:
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No comment has been added lately, so it's time to clean up this TA.
I will leave a recommendation in the Cleanup topic area that this question is:

- To be PAQed and points NOT refunded.

Please leave any comments here within the next seven days.

PLEASE DO NOT ACCEPT THIS COMMENT AS AN ANSWER!

girionis
EE Cleanup Volunteer

Hi,

the posted code performs exactly what was asked for.

Greetings,
    </ntr> :)

Dear Computer101,

since my comment is the only comment here, if you don't think that it solves the given problem - you should delete the question, not PAQ it.

</ntr>