Convert Audio Beeps And Dashes into Text

Ok I thought this would be a cool sort of project using this morse code script I found in the Forum. Looking at it makes me think it should be possible to do the reverse, that is to say take the audio clips of the "Dash" and "Dot" and then convert them back into text (Alphabet) to make a Morse Code receiver.

Not quite sure where to begin on that but it looks possible so if someone could save be a little time and get me pointed in the right direction as to where to begin that would be great. My initial thought is that maybe the "Dash" and "Dot" clips could be identified by "AudioClip length?"

 public void PlayMorseCodeMessage(string message)
     {
         StartCoroutine("_PlayMorseCodeMessage", message);
     }
     
         private IEnumerator _PlayMorseCodeMessage(string message)
     {
         // Remove all characters that are not supported by Morse code...
         Regex regex = new Regex("[^A-z0-9 ]");
         message = regex.Replace(message.ToUpper(), "");
         
         // Convert the message into Morse code audio... 
         foreach(char letter in message)
         {
             if (letter == ' ')
                 yield return new WaitForSeconds(spaceDelay);
             else
             {
                 int index = letter - 'A';
                 if (index < 0)
                     index = letter - '0' + 26;
                 string letterCode = alphabet[index];
                 foreach(char bit in letterCode)
                 {
                     // Dot or Dash?
                     AudioClip       sound = dotSound;
                     if (bit == '-')    sound = dashSound;
                     
                     // Play the audio clip and wait for it to end before playing the next one.
                     GetComponent<AudioSource>().PlayOneShot(sound);
                     yield return new WaitForSeconds(sound.length + letterDelay);
                 }
             }
         }