The effect of climate on acoustic signals: Does atmospheric sound absorption matter for bird song and bat echolocation?

Echolocation calls produced by bats in their larynges allow these flying, nocturnal mammals to orient and find food at night. The acoustic signals are not like bird song, and even individual bats exhibit great flexibility in call design and between-species overlap is common. As a result, identifying bats to species by their echolocation calls even in communities with few bat species can be difficult. Unfortunately, the situation is worse still. As a result of several factors — some to do with microphones, some with environment, some with bats, and the calls themselves — acoustic information transmitted to and transduced by microphones can be dramatically different from the actual signal produced by the bat and as would be recorded on axis, close to its mouth using ideal microphones under ideal conditions. We outline some of these pitfalls and discuss ways to make the best of a bad situation. Overall, however, we stress that many of these factors cannot be ignored and do impact our recordings.

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Review of audition literature: Selection of acoustic signals for use in the synthesis of auditory space.

PsycEXTRA Dataset ◽

10.1037/e466502004-001 ◽

1990 ◽

Author(s):

Don C. Teas

Keyword(s):

Acoustic Signals ◽

Auditory Space ◽

Literature Selection ◽

Selection Of

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Classification of Fatigued Bills Based on a Support Vector Machine by Using the Amplitude Difference Features of Acoustic Signals

IEEJ Transactions on Electronics Information and Systems ◽

10.1541/ieejeiss.131.1495 ◽

2011 ◽

Vol 131 (8) ◽

pp. 1495-1501

Author(s):

Dongshik Kang ◽

Masaki Higa ◽

Hayao Miyagi ◽

Ikugo Mitsui ◽

Masanobu Fujita ◽

...

Keyword(s):

Support Vector Machine ◽

Acoustic Signals ◽

Support Vector ◽

Amplitude Difference

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Topoi in der Musik Béla Bartóks

Studia Musicologica ◽

10.1556/smus.54.2013.3.3 ◽

2013 ◽

Vol 54 (3) ◽

pp. 289-299

Author(s):

Jürgen Hunkemöller

Keyword(s):

Bird Song ◽

Musical Analysis ◽

Piano Concerto ◽

The Third ◽

Different Types ◽

Important Means

The recognition of topoi, i.e. traditional formulae, is an important means of musical analysis. To illustrate this, the paper discusses the types of the battaglia and the pastoral in Bach’s Cantata Halt im Gedächtnis Jesum Christ, and briefly enumerates different types of allusions to jazz in 20th-century compositions by Stravinsky, Milhaud, Blacher, Tippet, and Zimmermann. Then it raises the possibility of an analysis of topoi in Bartók’s music in four main categories. It considers Bartók’s musical quotations from Bach to Shostakovich; the chorale as special topos appearing in Mikrokosmos, in the Concerto for Orchestra, in the Adagio religioso of the Third Piano Concerto; the topos-like employment of the tritone; and finally the idea of a Bartókian Arcadia in the Finale of Music for Strings, and the integration of bird song in the Adagio religioso.

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