Sound Processing in Real-World Environments

Feng, Albert S.; Schul, Johannes

doi:10.1007/978-0-387-47796-1_11

Cited by 27 publications

(23 citation statements)

References 113 publications

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“…With the mild weather conditions during most of the investigation time, there are more chances to perceive birdsong and tree rustling at the same time. However, as also reported by some researchers, birds often stop singing when the weather condition is harsh such as windy or raining heavily [39]. This point was verified in this research by the negative relationship between birdsong and rain (-0.155) too, when it was raining heavily during the last period.…”

Section: Relationships With Other Soundssupporting

confidence: 88%

Birdsong As an Element of the Urban Sound Environment: A Case Study Concerning the Area of Warnemünde in Germany

Liu¹,

Kang²,

Behm³

2014

Acta Acustica united with Acustica

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SummaryBirds are common species in urban ecosystems and birdsong is an important element of many urban sound environments. Perceptions of birdsong loudness, based on a case study in Warnemünde, a coastal area in Germany, were analysed in terms of its role in urban sound environment, the relationships with other sounds, spatiotemporal characteristics, as well as the relationships with underlying landscape characteristics. An important and positive role of birdsong in urban soundscape perception in the study area was recognised. The analysis of the relationships between birdsong perception and other sounds suggested that, although birds could adjust their songs with continual urban traffic sounds, they are still sensitive to excessive sounds related to human appearance (adult voice, child voice and footstep) or human activities (construction sounds, music). The spatiotemporal patterns of perceived loudness of birdsong suggested the adapted patterns of bird species in urban areas. Perceived loudness of birdsong showed close relationships with the underlying landscape characteristics indicated by a series of landscape spatial pattern indices. Positive relationships were found with construction density, road density, vegetation density, as well as fragmentation status indicated by patch density, largest patch index, landscape shape index, fractal dimension and contagion.

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Section: Relationships With Other Soundssupporting

confidence: 88%

Birdsong As an Element of the Urban Sound Environment: A Case Study Concerning the Area of Warnemünde in Germany

Liu¹,

Kang²,

Behm³

2014

Acta Acustica united with Acustica

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“…Among the best-studied animal groups in this regard are dawn choruses and evening roosts of songbirds (Klump, 1996), large colonies of seabirds, such as penguins (Aubin and Jouventin, 1998, 2002), and breeding choruses of frogs (Bee, 2012; Vélez et al, 2014) and insects (Römer, 2014). In the large ethological literature on animal communication, biological analogues of the human cocktail party problem have been more thoroughly investigated in frogs than in any other group of animals (Bee, 2012; Feng and Schul, 2007; Hulse, 2002; Narins and Zelick, 1988; Vélez et al, 2014). …”

Section: Introductionmentioning

confidence: 99%

Treefrogs as animal models for research on auditory scene analysis and the cocktail party problem

Bee

2015

International Journal of Psychophysiology

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The perceptual analysis of acoustic scenes involves binding together sounds from the same source and separating them from other sounds in the environment. In large social groups, listeners experience increased difficulty performing these tasks due to high noise levels and interference from the concurrent signals of multiple individuals. While a substantial body of literature on these issues pertains to human hearing and speech communication, few studies have investigated how nonhuman animals may be evolutionarily adapted to solve biologically analogous communication problems. Here, I review recent and ongoing work aimed at testing hypotheses about perceptual mechanisms that enable treefrogs in the genus Hyla to communicate vocally in noisy, multi-source social environments. After briefly introducing the genus and the methods used to study hearing in frogs, I outline several functional constraints on communication posed by the acoustic environment of breeding “choruses”. Then, I review studies of sound source perception aimed at uncovering how treefrog listeners may be adapted to cope with these constraints. Specifically, this review covers research on the acoustic cues used in sequential and simultaneous auditory grouping, spatial release from masking, and dip listening. Throughout the paper, I attempt to illustrate how broad-scale, comparative studies of carefully considered animal models may ultimately reveal an evolutionary diversity of underlying mechanisms for solving cocktail-party-like problems in communication.

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“…Based on the neurophysiological data of Rose and Capranica (1984) on two other toad species, the authors speculate that species discrimination abilities of females could be compromised at distances of 80 m or greater from calling males. Indeed, Ratnam et al (2004), also see Feng and Schul 2006), showed that structural alterations to the fine temporal components of the calls of Rana pipiens pipiens as a result of echoes and reverberation can affect the response of neurons in the auditory midbrain in a way likely to impair call discrimination. In a study of neotropical species, Kime et al (2000) observed that calls suffered less degradation when broadcast from greater elevation and when broadcast through more open habitats.…”

Section: Introductionmentioning

confidence: 97%

Calling site choice and its impact on call degradation and call attractiveness in the gray treefrog, Hyla versicolor

Schwartz

Hunce

Lentine

et al. 2015

Behav Ecol Sociobiol

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To evaluate the effects of calling site on call degradation, we broadcast synthetic advertisement calls of male gray treefrogs through forest, over open terrain, and across pond water. Calls were recorded at distances of 1, 2, 4, 8, 16, and 32 m. We varied speaker and microphone heights for a total of five elevation combinations ranging from surface level to a height of 1.5 m. We quantified structural degradation in recorded calls using BΔV,^a measure of relative sound energy in call pulses and interpulse intervals. A subset of recorded calls was used in two-speaker discrimination tests with females. Finally, we examined male selection of perch height by recording locations of calling males on ladder-like trellises positioned around the periphery of a breeding pond. We found the greatest degradation for calls broadcast through forest followed by calls transmitted across open terrain and then pond water. At relatively small source-receiver separations, elevation had only small effects on degradation. However, for separations greater than 4 m (especially through forest), elevation had a significant impact on ΔV-with calls broadcast and recorded near the substrate particularly vulnerable to degradation. Choice tests demonstrated that such levels of degradation could significantly reduce a male's attractiveness. This may, in part, explain why males only seldom called from low rungs of trellises.

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Sound Processing in Real-World Environments

Cited by 27 publications

References 113 publications

Birdsong As an Element of the Urban Sound Environment: A Case Study Concerning the Area of Warnemünde in Germany

Birdsong As an Element of the Urban Sound Environment: A Case Study Concerning the Area of Warnemünde in Germany

Treefrogs as animal models for research on auditory scene analysis and the cocktail party problem

Calling site choice and its impact on call degradation and call attractiveness in the gray treefrog, Hyla versicolor

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