[ 04/20/2017 ] Labels: 95.Video & Study1
50. A(221Hz) Endpin-tip vibration data
[ 04/08/2017 ] Labels: 48..Beat.Endpin
3 sec after a A(221Hz, open string) pizzicato
Cello: 110-year-old German cello
Endpin: 10mm(D) steel pipe, 28cm(11in) below tailpin
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Some data might show weakness in intensity. The reason is unknown but it might caused by low-voltage at battery in contact microphone.
50. G(98Hz) Endpin-tip vibration data
[ 4/04/17 ] Labels: 50.Beat.Endpin
On stand, endpin is floating,
pin-tip takes natural various beats.
Placed on the floor, endpin is fixed in place,
pin-tip keeps homogeneous 3-beat.
On Advanced Endpin Holder,
pin-tip takes a mediate vibration beat pattern between above.
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3 sec after a G(98Hz, open string) pizzicato
Cello: 110-year-old German cello
Endpin: 10mm(D) steel pipe, 28cm(11in) below tailpin
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50. C(66Hz) Endpin-tip vibration data
[ 3/29/2017 ] Labels: 48..Beat.Endpin
[ comment ]
On a stand(,endpin is floating in the air),
bridge takes natural beat pattern (e.g. 4->3->2->3->2-) during fading out, and the endpin-tip unexpectedly ceases the vibration in a short time.
With endpin and placed on the floor,
both bridge and endpin keep mainly constant 4-beat, moreover the endpin has a long vibration duration.
On Advanced Endpin Holder(AEH-011),
bridge has rather a similar beat pattern to the case of 'floating' cello and the beat of endpin-tip is also similar to the bridge. The duration time of the endpin-tip is medium between above.
3 sec after a C(66Hz, open string) pizzicato
Cello: 110-year-old German cello
Endpin: 10mm(D) steel pipe, 28cm(11in) below tailpin
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Please remember some findings at Label-47.(Propagation).
(1)The beat pattern of bridge very linked to that of the center area of top plate.
(2)Without the endpin, cello body naturally faded out taking beats e.g. 4->3->2->3->2->1, but when with the endpin and placed on the floor, the bridge kept characteristic flat 4-beat.
In this case, 110-year-old instrument is probably consisted of stiff wood, although the results might be slightly different from Label-47., but the structure of the cello is basically the same. Common inclination should also be expected.
50. Research focusing on the vibration of endpin-tip
[ 3/21/2017 ] Labels: 48..Beat.Endpin
Let's make a further research effort focusing on the vibration of tip of endpin.
50. The vibration of endpin-tip
[ 3/19/2017 ] Labels: 48..Beat.Endpin
Two video samples show the the vibration of endpin-tip after a C(open string) pizzicato.
[Top:] (1)Contact(flat) microphone data measured at the tip of endpin and (2)usual sound microphone data in the room.
[Bottom:] A small dental mirror was installed at the tip of endpin. The mirror casts small spotlight about 3 meter away.
In this 40 sec video the endpin mainly vibrated 64-65 times. We can also recognize the vibration in video as '96-100 tempo'.
It just matches the calculation of C(66Hz, 15.2msec, fundamental) vibration : 66Hz * 60sec / 40slower = '99 tempo'
In the measurement, contact microphone detects internal 6/5/4,, beats in a cycle period.
A reflection of light in the mirror takes a stiff oscillation and gives us a premonition of existence of these tiny beats.
Video: 1 sec after a C(open string) pizzicato, 40 times slower
Cello: 110-year-old German cello on stand
Endpin: 10mm(D) steel pipe, 33cm(13in) below tailpin
Camera: SONY RX100-4 ( zoomed to two times )
A0. Advertisement
[ 3/14/2017 ] Labels: A0.Advertisement
Behind their concern about toes, cellos still retain the innate great capabilities to sing and dance.
Need further researches.
A1. Available angle
[ 3/02/2017 ] Labels: A1..AEH
Advanced Endpin Holder(AEH-011, 012) requires your cello to be kept a proper angle from the floor.
In case that the diameter of the tip of your endpin is 8 mmΦ, the placing angle of your cello should be at between 45 and 90 degrees.
Please avoid to take a shallow angle.
浅すぎる(チェロ)角度での利用を避けてください。
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