Physicists have reproduced the acoustic effect that causes chirping reverberations in the Kukulkan pyramid. Article about it published In Physics Education.
The Kukulkan Pyramid is an ancient Mayan temple located in the city of Chichen Itza. It is not high compared to the pyramids of Giza and rises only 24 meters, but it is distinguished by the elegance of architecture and unusual acoustics. When you clap your hands at the bottom, the reflected sound will be similar to the cry of the quetzal bird, the sacred animal of Maya.
Diego Arevalo of the University of Antonio Nariño (Colombia) and his colleagues were able to reproduce this effect based on their amateur footage. During computer processing, the scientists presented the sound in the form of separate reflections from all the steps of the temple stairs. The unusual phenomenon owes its existence to the multiple reflections of the sound coming from the stairs. Each subsequent stage sends back the same, but slightly delayed audio signal. According to physicists, this delay equals, on average, two milliseconds.
The “chill” is due to multiple reflections of sound with a continuous spectrum. Echo gives the same sound, but with a slight shift in the waveform at each stage, resulting in a clicking sound. The same effect was achieved by folding the waves 30 times using the Audacity program from the original cotton.
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