How to properly destroy a script-created AudioClip ?

Hello everybody,

I'm currently trying to create a Speech recognition system.. and it work pretty well. The only problem I have is that my AudioClip won't be freed.

To create my AudioClip, I'm using the Microphone looping AudioClip. When I think the user has spoken (using the sample array), I create a new AudioClip and give him the part of the sample array when the user speaks.

Something like that :

     /// <summary>
     /// Takes a part within a sample array and put it within an AudioClip
     /// </summary>
     /// <param name="samples">The sample array</param>
     /// <param name="first">The first sample to take</param>
     /// <param name="last">The last sample to take</param>
     /// <param name="freq">The frequency of the AudioClip</param>
     /// <returns>the cutted AudioClip</returns>
     public static AudioClip TrimClip(
         float[] samples, int first, int last, int freq)
     {
         int nSamples = last - first;
         float[] newSamples = new float[nSamples];

         for (int i = first; i < last; i++)
         {
             newSamples[i - first] = samples[i];
         }

         AudioClip ac = AudioClip.Create(
             "ToRecognize", nSamples, 1, freq, false, false);

         ac.SetData(newSamples, 0);
         return ac;
     }

When I don't need the AudioClip, I just use this method :

     /// <summary>
     /// Frees an AudioClip
     /// </summary>
     /// <param name="ac">
     /// The AudioClip we want to remove from our memory
     /// </param>
     public static void FreeAudioClip(AudioClip ac)
     {
         AudioClip.DestroyImmediate(ac, false);
         // AudioClip.Destroy(ac);
         // Resources.UnloadAsset(ac);
         // GameObject.Destroy(ac);
     }

I'm sure I give those methods every AudioClip, I've already tested. No one among those for Destroy methods makes the Profiler drop the number of AudioClip.

So if I want to create a looot of AudioClips, my memory begins to hate me..

The only simillar I found was with Loaded assets, which is not my case, that's why I created this topic,

I thank you in advance and for reading :)