reference pitch的用法和样例：
例句
- Thus, the FFR provides a noninvasive window to view neural processing of pitch at the level of the auditory brainstem.
结果表明，在四分之三的音调中，汉语受试者的基音跟踪曲线较英语受试者平缓。 - The cepstrum method of speech pitch detection was analyzed carefully, and several shortcomings were pointed out when the method was realized digitally.
摘要对基音检测的倒谱法进行了分析，指出其在基音检测计算及其数字实现时存在不足。
