Results 221 to 230 of about 117,768 (256)

ULTRASONIC FREQUENCIES IN BIRD SONG

Ibis, 1962
THERE is much circumstantial evidence that, in the majority of birds at least, the communicative function of call notes and song depends principally if not entirely on those frequencies which fall within the range of normal human hearing1. Nevertheless, the limitations of the recording apparatus which has so far been used in the study of bird song are ...
W H, THORPE, D R, GRIFFIN
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The Scaling of Song Frequency in Cicadas

Journal of Experimental Biology, 1994
ABSTRACT In male cicadas, sound is generated by a pair of tymbals on the abdomen (Pringle, 1954). The tymbals buckle inwards causing pressure changes in the abdominal cavity, from which sound is radiated through the tympana (Young, 1990).
, Bennet-Clark, , Young
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Memory for Frequency of Hearing Popular Songs

The American Journal of Psychology, 1988
In two experiments college students were asked to provide situational frequency estimates of 10-s excerpts from rock songs. In both experiments familiarity of the musical selections heard one, two, three, or four times was varied. In Experiment 2 the nature of instructions given to subjects prior to presentation of the musical excerpts was also ...
J R, Fidler, E B, Zechmeister, J J, Shaughnessy   +2 more
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Shift of song frequencies in response to masking tones

Animal Behaviour, 2013
Ambient noise can interfere with signal transmission and detection across many taxa and modalities. Evidence suggests that, over time, signals evolve to minimize interference from ambient noise and other signalling animals. Less well studied is the possibility of short-term behavioural responses to transient ambient noise, in which animals actively ...
Sarah E. Goodwin, Jeffrey Podos
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SongF0: A Spectrum-Based Fundamental Frequency Estimation for Monophonic Songs

Circuits, Systems, and Signal Processing, 2020
In this paper, we propose a fundamental frequency ( $$f_0$$ ) estimation method for monophonic songs.
Pradeep Rengaswamy, K. Sreenivasa Rao, Pallab Dasgupta   +2 more
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The evolution of extreme sound frequencies in bird songs

Evolution
Abstract Bird songs differ widely among species and can show peculiar phenotypes, such as extreme or unusual sound frequencies for a species’ body size. Although birds modulate sound frequency, size-related limitations prevent vocalizing efficiently (i.e., with high amplitude) at any frequency.
Gonçalo C, Cardoso, Jakob Isager, Friis, Joana, Sabino, Pedro, Santos, Torben, Dabelsteen   +4 more
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Testosterone implants alter the frequency range of zebra finch songs

Hormones and Behavior, 2005
To investigate whether changes in testosterone alter the frequency range in which a zebra finch produces song, we assigned male zebra finches to two groups, one of which received testosterone implants and the other empty silastic capsule implants. We then recorded songs up to 52 weeks after the surgery and measured frequency changes in the fundamental ...
Jeffrey, Cynx, N Jay, Bean, Ian, Rossman
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Role of the Carrier Frequency in the Territorial Songs of Oscines

Ethology, 1986
AbstractBirds cannot emit acoustic signals of very low frequencies. To code a message with such signals they shift them upwards by using a frequency modulation. The new frequency chosen for transmission is the carrier. Its value is adapted to the phonetic and sensory capacities of the bird, as well as to the characteristics of the channel.The code does
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Song Variability and the Response To Conspecific Song and To Song Models of Different Frequency Contents in Males of the Bushcricket Requena Verticalis (Orthoptera: Tettigoniidae)

Behaviour, 1991
AbstractVariability in the temporal structure of the song has been investigated for the Australian bushcricket Requena verticalis (Listroscelidinae: Tettigoniinae: Orthoptera). Chirp interval and chirp duration of an individual male vary between two days. Males differ in their readiness to call.
Andrea Schatral, Winston J. Bailey
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Frequency Modulation During Song in a Suboscine Does Not Require Vocal Muscles

Journal of Neurophysiology, 2008
The physiology of sound production in suboscines is poorly investigated. Suboscines are thought to develop song innately unlike the closely related oscines. Comparing phonatory mechanisms might therefore provide interesting insight into the evolution of vocal learning.
Ana, Amador, Franz, Goller, Gabriel B, Mindlin   +2 more
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