Computational Loudness Prediction: Ambiguities and Potential Improvements of ANSI S3.4-2007

The current American national standard for computationally predicting the loudness of steady sounds, ANSI S3.4-2007, is accompanied by an informative software program implementing the procedure. In addition to this sample software, an unambiguous standard document is essential for providing the basis of standard-conform predictions and future calibration procedures. This contribution suggests some implementation examples, with a special focus on clarifying potential ambiguities. These solutions and clarifications may contribute to a more specific and thereby further improved next-generation ANSI loudness standard.