![]() If the fingers of one hand struck the palm of the other hand (P3, A3) there was a broad spectral peak near 2 kHz. If the palms struck each other (P1, A1) there was a narrow frequency peak below 1 kHz together with a notch around 2.5 kHz. He also measured his own clapping with the eight modes above. Repp’s acoustic analyses and perceptual experiments mainly involved 20 test subjects who were each asked to clap at their normal rate for 10 seconds in a quiet room. The spectra of individual claps varied widely, but there was no evidence of influence of sex or hand size on the clap spectrum. The figure below shows photos of these eight configurations of hand claps, excerpted from Leevi Peltola’s 2004 MSc thesis. So what does a single hand clap sound like? This whole field of applause and clapping studies originated with a well-cited 1987 study by Bruno Repp, “The sound of two hands clapping.” He distinguished 8 hand clap positions And as voice recognition and related technologies continue to advance, the need for hand clap-based communication diminishes. But why the authors completely dismissed Morse code and all other simple forms of binary encoding is beyond me. The hand claps and their timing are relatively easy for a robot to decode, and not that difficult for a human to encode. Hanahara, Tada and Muroi exploited the impulse-like nature of hand claps for devising a means of Human-Robot Communication. They found that, with a small amount of additional but automated signal processing, the claps can produce reliable acoustical measurements. Seetharaman and colleagues investigated the effectiveness of hand claps as impulse sources. Hand claps do not have completely flat impulse responses, are not completely omnidirectional, have significant duration and are not very high energy. And in acoustic measurement, if one can produce an impulsive sound at a given location and record the result, one can get an idea of the reverberation that the room will apply to any sound produced from that location.īut a hand clap is a crude approximation for an impulse. Thus, they are effective used to synchronising sound and picture, as well as to designate the starts of scenes or takes during production. The clapperboard produces a sharp clap noise that can be easily identified on the audio track, and the shutting of the clapstick at the top of the board can similarly be identified on the visual track. In film and television, clapperboards have widespread use. clappers and clapsticks are musical instruments, typically consisting of two pieces of wood that are clapped together to produce percussive sounds. Impulsive sounds are used for rhythm, for tagging important moments on a timeline, or for estimating the acoustic properties of a room. Clapping your hands together is one of the simplest ways in which we can approximate an impulse, or short broadband sound, without the need for any equipment. But from an auditory perspective, what makes it special?Īpplause is nothing more than the sound of many people gathered in one place clapping their hands. We all know when we hear it, and a quick search of famous quotes reveals that there are many ways to describe the many types of applause thunderous applause, tumultuous applause, a smattering of applause, sarcastic applause, and of course, the dreaded slow hand clap. This got me thinking about what are some other under-researched sounds. Its one of those everyday sounds that we are particularly attuned to, but that there hasn’t been much research on. In a recent blog entry, we discussed research into the sound of screams. “You must be prepared to work always without applause.”
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