Theoretical background: early verbal development is not yet fully understood, especially in its formative phase. Research question: can a reliable, easy-to-use coding scheme for the classification of early infant vocalizations be defined that is applicable as a basis for further analysis of language development? Methods: in a longitudinal study of 45 neurotypical infants, we analyzed vocalizations of the first 4 months of life. Audio segments were assigned to 5 classes: (1) Voiced and (2) Voiceless vocalizations; (3) Defined signal; (4) Non-target; (5) Nonassignable. Results: Two female coders with different experience achieved high agreement without intensive training. Discussion and Conclusion: The reliable scheme can be used in research and clinical settings for efficient coding of infant vocalizations, as a basis for detailed manual and machine analyses.

翻译：理论背景：早期言语发展尚未完全明确，尤其在形成阶段。研究问题：能否定义一种可靠且易于使用的婴儿早期发声分类编码方案，以作为语言发展进一步分析的基础？方法：通过对45名神经典型婴儿的纵向研究，我们分析了其生命前4个月的发声。音频片段被归入5个类别：（1）有声发声与（2）无声发声；（3）确定信号；（4）非目标信号；（5）不可分类信号。结果：两名经验不同的女性编码员在未经密集训练的情况下达到了高度一致性。讨论与结论：该可靠方案可用于研究及临床环境中的婴儿发声高效编码，为详细的人工分析与机器分析奠定基础。