We want the machine learning algorithms to able to handle a variety of background noise, and even relatively loud noises can be accepted provided that they don’t prevent you from hearing the entirety of the text. Quiet background music is OK; music loud enough to prevent you from hearing each and every word is not.
À ń fẹ́ kí ìṣisẹ́ ìkó ẹ̀rọ lè mójútó onírúurú ariwo abẹ́lẹ̀, kódà ìbáà ṣe ariwo tí ó pọ̀ tíẹ̀ lè jẹ́ gbígbà nìwọ̀n ìgba tí wọn ò bá ti dí ẹ lọ́wọ́ gbígbọ́ ọ̀rọ̀. Orin abẹ́lẹ̀ dára; ṣùgbọ́n orin tí ó ń pariwo tí ó sì ń dí ẹ lọ́wọ́ gbígbọ́ kò dára.