Spectrograms of the call of the Common Swift - Revision history

Martinwguy: /* Multiple notes or turbo vibrato */

2019-03-24T09:31:49Z

Multiple notes or turbo vibrato

← Older revision		Revision as of 09:31, 24 March 2019
Line 17:		Line 17:
	The bottom of the spectrogram represents 3386Hz, the top 16106Hz and the clip lasts 0.4 seconds.		The bottom of the spectrogram represents 3386Hz, the top 16106Hz and the clip lasts 0.4 seconds.
	The yellow line is the main song ranging from 4000 to 4500Hz and the fainter line above is the first harmonic		The yellow line is the main song ranging from 4000 to 4500Hz and the fainter line above is the first harmonic
	of that tone, from 8000 to ~~900Hz~~ but what is that short line 500Hz above the fundamental ~~tone~~?		of that tone, from 8000 to 9000Hz, but what is that short line 500Hz above the fundamental?

	Here it is slowed down by eight times, which drops it by three octaves so that we humans can hear it better		Here it is again, slowed down by eight times, which drops it by three octaves so that we humans can hear it better
	and slows it down that our slow brains can follow it.		and slows it down that our slow brains can follow it.
	They're not harmonics of anything; it's a chord of two notes, with another two fainter ones above and below that.		They're not harmonics of anything; it's a chord of two notes, with another two fainter ones above and below that.
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	differences of about 470Hz and of 550Hz, so it may be that the		differences of about 470Hz and of 550Hz, so it may be that the
	swift is frequency-modulating its call, putting a vibrato on the main tone to vary the frequency 500 times a second.		swift is frequency-modulating its call, putting a vibrato on the main tone to vary the frequency 500 times a second.
	In human voice terms, it would mean being able to ~~vary the frequency of~~ a sung note fifty times a second.		In human voice terms, it would mean being able to wobble a sung note up and down fifty times a second.

	This still means it has two voices~~. The~~ main ~~voice~~ is about 5000Hz and the frequency modulation (if that's what it is)		This still means it has two voices, two sound generators: the main one is at about 5000Hz and the frequency modulation (if that's what it is) is at about 500Hz which, to them, is more like growling than singing.
	is at about 500Hz which, to them, is more like growling than singing.

	At a ~~distance~~, a 500Hz raspberry would be inaudible ~~to a swift, especially~~ at a distance,		To a swift, a 500Hz raspberry would be inaudible at a distance, but by frequency-modulating the main vocal chord,
	but by frequency-modulating the main vocal chord,		the extra sounds this creates are within the range at which they hear best and would also be audible at a distance.
	the extra sounds it creates ~~would be~~ within the range at which they hear best and would also be audible at a distance.
			Clever! Now, all that we oh-so-clever humans have to do is understand what they are saying...

Martinwguy: /* Multiple notes or turbo vibrato */

2019-02-26T13:06:59Z

Multiple notes or turbo vibrato

← Older revision		Revision as of 13:06, 26 February 2019
Line 16:		Line 16:

	The bottom of the spectrogram represents 3386Hz, the top 16106Hz and the clip lasts 0.4 seconds.		The bottom of the spectrogram represents 3386Hz, the top 16106Hz and the clip lasts 0.4 seconds.
	The ~~lines are~~ the main song ranging from 4000 to 4500Hz and the fainter line above is the first harmonic		The yellow line is the main song ranging from 4000 to 4500Hz and the fainter line above is the first harmonic
	of that tone, from 8000 to 900Hz but what is that short line 500Hz above the fundamental tone?		of that tone, from 8000 to 900Hz but what is that short line 500Hz above the fundamental tone?

Martinwguy: /* Multiple notes or turbo vibrato */

2019-02-26T12:59:59Z

Multiple notes or turbo vibrato

Martinwguy: /* The polyphonic call of the Common Swift */

2019-02-26T12:56:44Z

The polyphonic call of the Common Swift

← Older revision		Revision as of 12:56, 26 February 2019
Line 3:		Line 3:
	=The polyphonic call of the Common Swift=		=The polyphonic call of the Common Swift=

	The last few years, I've helped fallen Common Swifts grow and fly again.		The last few years, I've helped fallen Common Swifts grow and fly again, and
	In some of the 45-minute breaks I had between feeding them, I recorded some of their chirping,		In some of the 45-minute breaks I had between feeding them, I recorded some of their chirping,
	hoping to learn their language.		hoping to learn their language.

Martinwguy at 12:55, 26 February 2019

2019-02-26T12:55:51Z

← Older revision		Revision as of 12:55, 26 February 2019
Line 3:		Line 3:
	=The polyphonic call of the Common Swift=		=The polyphonic call of the Common Swift=

	~~For the~~ last few years, I've ~~looked after~~ fallen Common Swifts		The last few years, I've helped fallen Common Swifts grow and fly again.
	~~and, in~~ some of the 45-minute breaks between feeding, recorded some of their ~~cheerful~~ chirping		In some of the 45-minute breaks I had between feeding them, I recorded some of their chirping,
	~~with a high-quality microphone~~.		hoping to learn their language.

	~~I was thinking to try and learn to recognise a little of their language~~		Instead I found another marvel: they sing more than one note at a time.
	~~so as to know when someone was thankful, thirsty,~~
	~~hungry, afraid, in pain or whatever, so as to be able to treat them better.~~

	Instead I found another marvel: they ~~can~~ sing more than one note at a time.

	==Multiple notes or turbo vibrato==		==Multiple notes or turbo vibrato==

	Here's the third ~~trill~~ of a ten-second sequence of fourteen trills from Rondone #3 of 2018.		Here's the third of a ten-second sequence of fourteen trills from Rondone #3 of 2018.

	{{Spectrogallery\|2018-05 Rondone 2018-05 n3 polyphonic call 0.4s}}		{{Spectrogallery\|2018-05 Rondone 2018-05 n3 polyphonic call 0.4s}}

	and ~~here~~ it is slowed down by eight times, which drops it by three octaves so that we can hear it better		The bottom of the spectrogram represents 3386Hz, the top 16106Hz and the clip lasts 0.4 seconds.
			The lines are the main song ranging from 4000 to 4500Hz and the fainter line above is the first harmonic
			of that tone, from 8000 to 900Hz but what are those extra lines. 500Hz and 100Hz above the fundamental tone?

			Here it is slowed down by eight times, which drops it by three octaves so that we humans can hear it better
	and slows it down that our slow brains can follow it.		and slows it down that our slow brains can follow it.
			They're not harmonics of anything; it's a chord of two notes, with another two fainter ones above and below that.

	{{Spectrogallery\|2018-05 Rondone 2018-05 n3 polyphonic call slowed down 8 times}}		{{Spectrogallery\|2018-05 Rondone 2018-05 n3 polyphonic call slowed down 8 times}}

	~~The melody moves between 4500 and 5500Hz~~		The extra notes look equally spaced in frequency. At the bottom of the first trough
	~~and the fainter lines higher up the graph and parallel with it~~
	~~are its first and second harmonics (at twice and three times its~~
	~~frequency.)~~

	~~But what are those extra notes just above and below the main one?~~
	~~They're not harmonics of anything; it's a chord of at least three notes.~~

	The extra notes look equally spaced in frequency~~, so it may be that the~~
	~~swift is frequency-modulating its call~~. At the bottom of the first trough
	about three quarters of the way through, the melody is about 4580Hz,		about three quarters of the way through, the melody is about 4580Hz,
	the line above it at 5050Hz and the one above that at 5600Hz,		the line above it at 5050Hz and the one above that at 5600Hz,
	differences of 470Hz and of 550Hz		differences of about 470Hz and of 550Hz, so it may be that the
			swift is frequency-modulating its call, putting a vibrato on the main tone to vary the frequency 500 times a second.

	~~However, this~~ still means it has two voices. ~~Their~~ main voice is about 5000Hz		This still means it has two voices. The main voice is about 5000Hz and the frequency modulation (if that's what it is)
	~~but~~ the frequency modulation is at about 500Hz which, to them, is more like growling than singing.		is at about 500Hz which, to them, is more like growling than singing.
	In human terms, it would mean being able to ~~apply vibrato to~~ a note ~~with the speed of mains hum~~.		In human voice terms, it would mean being able to wobble the frequency of a sung note fifty times a second.

	At a distance, a 500Hz raspberry would be inaudible to a swift, especially at a distance,		At a distance, a 500Hz raspberry would be inaudible to a swift, especially at a distance,
	but by frequency-modulating the main vocal chord ~~with it~~,		but by frequency-modulating the main vocal chord,
	the extra sounds they ~~generate are within their~~ best ~~range of hearing~~ and ~~can~~ also be heard well at a distance.		the extra sounds it creates would be within the range at which they hear best and would also be heard well at a distance.

Martinwguy at 12:03, 26 February 2019

2019-02-26T12:03:03Z

← Older revision		Revision as of 12:03, 26 February 2019
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	For the last few years, I've looked after fallen Common Swifts		For the last few years, I've looked after fallen Common Swifts
	and ~~took~~ the ~~opportunity to record~~ some of their cheerful chirping		and, in some of the 45-minute breaks between feeding, recorded some of their cheerful chirping
	with ~~some~~ high-quality microphone.		with a high-quality microphone.

	I was thinking to try and learn to recognise a little of their language		I was thinking to try and learn to recognise a little of their language
	so as to know when ~~another were telling me it~~ was thankful, thirsty,		so as to know when someone was thankful, thirsty,
	hungry, afraid, in pain or whatever, to be able to treat them better.		hungry, afraid, in pain or whatever, so as to be able to treat them better.

	Instead I found another marvel: they can sing more than one note at a time.		Instead I found another marvel: they can sing more than one note at a time.
Line 42:		Line 42:
	In human terms, it would mean being able to apply vibrato to a note with the speed of mains hum.		In human terms, it would mean being able to apply vibrato to a note with the speed of mains hum.

	At a distance, ~~the~~ 500Hz raspberry would be inaudible to a swift, especially at a distance,		At a distance, a 500Hz raspberry would be inaudible to a swift, especially at a distance,
	but by frequency-modulating the main vocal chord with it,		but by frequency-modulating the main vocal chord with it,
	the extra sounds they generate are within their best range of hearing and can also be heard well at a distance.		the extra sounds they generate are within their best range of hearing and can also be heard well at a distance.

Martinwguy: /* The polyphonic call of the Common Swift */

2019-02-22T19:25:21Z

The polyphonic call of the Common Swift

← Older revision		Revision as of 19:25, 22 February 2019
Line 13:		Line 13:
	Instead I found another marvel: they can sing more than one note at a time.		Instead I found another marvel: they can sing more than one note at a time.

	===Multiple notes or turbo vibrato===		==Multiple notes or turbo vibrato==

	Here's the third trill of a ten-second sequence of fourteen trills from Rondone #3 of 2018.		Here's the third trill of a ten-second sequence of fourteen trills from Rondone #3 of 2018.
Line 19:		Line 19:
	{{Spectrogallery\|2018-05 Rondone 2018-05 n3 polyphonic call 0.4s}}		{{Spectrogallery\|2018-05 Rondone 2018-05 n3 polyphonic call 0.4s}}

	The ~~principal note of the~~ melody moves between 4500 and 5500Hz		and here it is slowed down by eight times, which drops it by three octaves so that we can hear it better
			and slows it down that our slow brains can follow it.

			{{Spectrogallery\|2018-05 Rondone 2018-05 n3 polyphonic call slowed down 8 times}}

			The melody moves between 4500 and 5500Hz
	and the fainter lines higher up the graph and parallel with it		and the fainter lines higher up the graph and parallel with it
	are its first and second harmonics (at twice and three times ~~the~~		are its first and second harmonics (at twice and three times its
	frequency ~~of the main note~~.)		frequency.)

	But what are those extra notes just above and below the main one?		But what are those extra notes just above and below the main one?
Line 40:		Line 45:
	but by frequency-modulating the main vocal chord with it,		but by frequency-modulating the main vocal chord with it,
	the extra sounds they generate are within their best range of hearing and can also be heard well at a distance.		the extra sounds they generate are within their best range of hearing and can also be heard well at a distance.

	~~===Slowed down===~~
	~~Here it is again, slowed down by eight times, so that our slow brains can follow it,~~
	~~which also drops it by three octaves (to around 500Hz) where our ears can hear it better.~~

	~~{{Spectrogallery\|2018-05 Rondone 2018-05 n3 polyphonic call slowed down 8 times}}~~

Martinwguy: Created page with "This page has nothing to do with the WikiDelia; I needed to put it here to make playable versions of this study available. ---- =The polyphonic..."

2019-02-22T19:21:42Z

Created page with "<CENTER><SMALL>This page has nothing to do with the WikiDelia; I needed to put it here to make playable versions of this study available.</SMALL></CENTER> ---- =The polyphonic..."

New page

<CENTER><SMALL>This page has nothing to do with the WikiDelia; I needed to put it here to make playable versions of this study available.</SMALL></CENTER>
----
=The polyphonic call of the Common Swift=

For the last few years, I've looked after fallen Common Swifts
and took the opportunity to record some of their cheerful chirping
with some high-quality microphone.

I was thinking to try and learn to recognise a little of their language
so as to know when another were telling me it was thankful, thirsty,
hungry, afraid, in pain or whatever, to be able to treat them better.

Instead I found another marvel: they can sing more than one note at a time.

===Multiple notes or turbo vibrato===

Here's the third trill of a ten-second sequence of fourteen trills from Rondone #3 of 2018.

{{Spectrogallery|2018-05 Rondone 2018-05 n3 polyphonic call 0.4s}}

The principal note of the melody moves between 4500 and 5500Hz
and the fainter lines higher up the graph and parallel with it
are its first and second harmonics (at twice and three times the
frequency of the main note.)

But what are those extra notes just above and below the main one?
They're not harmonics of anything; it's a chord of at least three notes.

The extra notes look equally spaced in frequency, so it may be that the
swift is frequency-modulating its call. At the bottom of the first trough
about three quarters of the way through, the melody is about 4580Hz,
the line above it at 5050Hz and the one above that at 5600Hz,
differences of 470Hz and of 550Hz

However, this *still* means it has two voices. Their main voice is about 5000Hz
but the frequency modulation is at about 500Hz which, to them, is more like growling than singing.
In human terms, it would mean being able to apply vibrato to a note with the speed of mains hum.

At a distance, the 500Hz raspberry would be inaudible to a swift, especially at a distance,
but by frequency-modulating the main vocal chord with it,
the extra sounds they generate are within their best range of hearing and can also be heard well at a distance.

===Slowed down===
Here it is again, slowed down by eight times, so that our slow brains can follow it,
which also drops it by three octaves (to around 500Hz) where our ears can hear it better.

{{Spectrogallery|2018-05 Rondone 2018-05 n3 polyphonic call slowed down 8 times}}

← Older revision		Revision as of 12:59, 26 February 2019
Line 17:		Line 17:
	The bottom of the spectrogram represents 3386Hz, the top 16106Hz and the clip lasts 0.4 seconds.		The bottom of the spectrogram represents 3386Hz, the top 16106Hz and the clip lasts 0.4 seconds.
	The lines are the main song ranging from 4000 to 4500Hz and the fainter line above is the first harmonic		The lines are the main song ranging from 4000 to 4500Hz and the fainter line above is the first harmonic
	of that tone, from 8000 to 900Hz but what ~~are those extra lines.~~ 500Hz ~~and 100Hz~~ above the fundamental tone?		of that tone, from 8000 to 900Hz but what is that short line 500Hz above the fundamental tone?

	Here it is slowed down by eight times, which drops it by three octaves so that we humans can hear it better		Here it is slowed down by eight times, which drops it by three octaves so that we humans can hear it better
Line 30:		Line 30:
	differences of about 470Hz and of 550Hz, so it may be that the		differences of about 470Hz and of 550Hz, so it may be that the
	swift is frequency-modulating its call, putting a vibrato on the main tone to vary the frequency 500 times a second.		swift is frequency-modulating its call, putting a vibrato on the main tone to vary the frequency 500 times a second.
			In human voice terms, it would mean being able to vary the frequency of a sung note fifty times a second.

	This still means it has two voices. The main voice is about 5000Hz and the frequency modulation (if that's what it is)		This still means it has two voices. The main voice is about 5000Hz and the frequency modulation (if that's what it is)
	is at about 500Hz which, to them, is more like growling than singing.		is at about 500Hz which, to them, is more like growling than singing.
	~~In human voice terms, it would mean being able to wobble the frequency of a sung note fifty times a second.~~

	At a distance, a 500Hz raspberry would be inaudible to a swift, especially at a distance,		At a distance, a 500Hz raspberry would be inaudible to a swift, especially at a distance,
	but by frequency-modulating the main vocal chord,		but by frequency-modulating the main vocal chord,
	the extra sounds it creates would be within the range at which they hear best and would also be ~~heard well~~ at a distance.		the extra sounds it creates would be within the range at which they hear best and would also be audible at a distance.