Reference for Rosh Hashanah 68:1

תשע תקיעות בתשע שעות ביום יצא

nine blasts at nine different times of the day, he has performed his religious obligation. It has been taught to the same effect: 'If one heard nine blasts at nine different times of the day, he has performed his religious obligation. If, however, he heard nine different people at once, he has not performed his obligation.<span class="x" onmousemove="('comment',' According to Tosaf. the reason is because he does not hear a teru'ah preceded and followed by a teki'ah. Rashi, however, reads: 'If he heard nine people at once, a teki'ah from one and a teru'ah from another, he has fulfilled his obligation, and even if he heard at intervals' etc. He points out that it has already been laid down above that two different sounds from two different persons can be discerned at once.');">¹</span>

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