Using a new, free spectrograph program to critically investigate acoustics

Ball, Edward; Ruiz, Michael J.

doi:10.1088/0031-9120/51/6/065025

Cited by 3 publications

(4 citation statements)

References 12 publications

(14 reference statements)

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“…For visualizing the sound, we elaborate spectrograms (i.e., signal amplitude graphs) after eliminating the excessive environmental noise. 12 We identified bird species based on morphological traits and vocalizations. [13][14][15][16][17][18][19][20]…”

Section: Methodsmentioning

confidence: 99%

Behaviour of native birds and analysis of vocalizations, in a small reforested urban space near downtown Goiânia, Goiás state, Brazil

Freitas,

Ball,

Fernandes

et al. 2023

IJAWB

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Due to habitat loss, several bird species that are dependent on forest environments seek refuge in green spaces within cities. The objective this study was to verify if the afforestation with autochthonous fruit trees of a small urban space could provide enough resources as food, shelter, and substrate for nesting of autochthonous bird species. Between June 2020-May 2021, during the covid-19 pandemic we observed the activity of bird species that visited a small forested urban space in Goiânia, Brazil. We recorded the behavioural activities of the birds using the focal animal technique, recordings of vocalizations and photographic and video recordings. About thirty species of birds were seen visiting our small urban wooded space. The most conspicuous species were the Amazonian Motmot, Picazuro Pigeon, Ferruginous Pygmy-Owl, Rufous-Browed Peppershrike, Rufous-bellied Thrush, Yellow-chevroned Parakeet, Great Kiskadee, Blue and Yellow Macaws, and the Common Potoo. All these species rested, vocalized and took refuge in the small urban wooded space. We also observed some species that nested, and many others that fed on tree fruits, insects and earthworms. We verified the presence of Amazonian Motmots (Momotus momota) adapted to this environment when we saw adult and juvenile Motmots and found an active nest. We also verified the reproductive adaptation of the Picazuro Pigeon (Patagioenas picazuro) observing the courtship and mating behaviour and found an occupied nest, which corroborates with the reproductive adaptation of the Picazuro Pigeon. We emphasize that native fruit trees are a fundamental part of urban environments, as they guarantee food for frugivorous birds, whereas mature leafy trees provide conditions for nesting and allow birds to congregate and communicate.

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Section: Methodsmentioning

confidence: 99%

Behaviour of native birds and analysis of vocalizations, in a small reforested urban space near downtown Goiânia, Goiás state, Brazil

Freitas,

Ball,

Fernandes

et al. 2023

IJAWB

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“…From the audio extracted from the video, a frequency analysis of the auditory response to the clapping will be made. Sound visualization is an important educational tool [18]. With the help of a DAW the sound of a clap will be treated to give it the DELAY characteristics according to the Kukulkan conditions and that result will be compared with the response sound in the video from the spectrum produced.…”

Section: Methodsmentioning

confidence: 99%

Reproduction of the acoustic effect of the Kukulkan pyramid by delay effect in DAW

Arévalo¹,

Abril²

2022

Phys. Educ.

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The Mayan city of Chichen Itza is full of legends and mysticism. There, in the temple of Kukulkan, in front of a great pyramid with 91 central staircases, an interesting physical-acoustic phenomenon occurs that has fed mythical stories attributed to the Mayas. When clapping your hands in front of the steps, the echo sounds very different from the sound emitted: The echo presents a ‘tonality’ that resembles a kind of bird chirping (chirp) which is said to be the response of the Quetzal, sacred bird of the Mayas. Earlier work has discussed the convolution method to find a simulation of the spectrum of the echo sound captured at Kukulkan. In this article we are going to present an analysis of the reflected sound using the wave superposition method, and thus obtain a sound with musical ‘Pitch’ as a result of the superposition of multiple reflections of a percussive sound, using the AUDACITY audio software, as demonstrated in the supplementary material.

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“…To sing the non-vibrato in figure 3, the throat and mouth were held in a rigid position, in contrast to the open and supple position maintained for operatic singing. This spectrogram was produced with the free online spectrograph published in Physics Education [17] and available at https://academo.org/articles/spectrogram/. This online spectrograph is described in detail in [17].…”

Section: Non-vibrato Tone (Straight Tone)mentioning

confidence: 99%

“…This spectrogram was produced with the free online spectrograph published in Physics Education [17] and available at https://academo.org/articles/spectrogram/. This online spectrograph is described in detail in [17].…”

Section: Non-vibrato Tone (Straight Tone)mentioning

confidence: 99%

The physics of singing vibrato

Michel¹,

Ruiz

2017

Phys. Educ.

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A spectrogram of a singer's vibrato presents a striking way to introduce students to frequency, Fourier spectra, and modulation. Vibrato is discussed from the perspectives of the physicist and the musician. A dramatic spectrogram is included where coauthor soprano Michel suppresses her vibrato so that acoustical characteristics can be compared to the same note sung with vibrato. A video (Ruiz 2017 Video: vibrato http://mjtruiz.com/ped/ vibrato/) is provided of this demonstration.

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Using a new, free spectrograph program to critically investigate acoustics

Cited by 3 publications

References 12 publications

Behaviour of native birds and analysis of vocalizations, in a small reforested urban space near downtown Goiânia, Goiás state, Brazil

Behaviour of native birds and analysis of vocalizations, in a small reforested urban space near downtown Goiânia, Goiás state, Brazil

Reproduction of the acoustic effect of the Kukulkan pyramid by delay effect in DAW

The physics of singing vibrato

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