Cello Resonance

4C5F. Cello-1 F(88Hz) on C-string Simulation x80 slower

[ 4/30/2020 ] Labels: 4C5F.Resonance C

F note on C-string(88Hz, 4C5F, bowing) Typical Resonance Simulation:
Cello body resonates taking a 2-beat for F(88 Hz). Endpin also resonates itself taking favorite beats according to each material/length with the cello body. As a result, the lower part of body seems to be repressed a little bit when placed on the floor.
(C線のF音、チェロ胴体は２ビートで共振しエンドピンは独自の共振ビートを取っている。その結果、胴体下部の振動が若干押さえられているように見える。)

Cello: Cello-1 (8-year-old) 80 times slower, silent video
Reference post:
--> https://advancedendpinholder.blogspot.com/
--> 94..Resonance Direction-C
--> 94..Cello-1 on C(C-G) Resonance Direction and V/H-Ratio

Left : Without endpin
Right: Floating, with carbon endpin

Left : On floor, with Titanium endpin
Right: On floor, with 8mmD metal-rod endpin

On AEH-011, with carbon endpin

4C7G. Cello-1 G(98Hz) on C-string Simulation x80 slower

[ 4/18/2020 ] Labels: 4C7G.Resonance C

G note on C-string(98Hz, 4C7G, bowing) Typical Resonance Simulation:
Cello body takes a single beat resonance in spite of various endpin environments.
G(98Hz) note seems to be the lowest frequency that cello body can resonate by a single swing.
(C線のG音、チェロが胴体全体を使って１ビートで共振できる最低音のようです。)

Cello: Cello-1 (8-year-old) 80 times slower, silent video

Reference post:
--> https://advancedendpinholder.blogspot.com/
--> 94..Resonance Direction-C
--> 94..Cello-1 on C(C-G) Resonance Direction and V/H-Ratio

Left : Without endpin
Right: Floating, with carbon endpin

Left : On floor, with carbon endpin

Right: On floor, with titanium endpin

4C4E. Cello-1 Simulation x70 slower

[ 4/10/2020 ] Labels: 4C4E.Resonance C

E note on C-string(83Hz, 4C4E, bowing) Typical Resonance Simulation:
On cello's low notes(C - F#), down beats from C-string need to be added cello body's up beats and completed by. However the extended height of body by deployed an endpin misses ideal up beats and weaken the resonance amplitude.

(C線上のE、エンドピン装着によりチェロは裏拍をうまく刻めず結果として十分な共鳴を実現できていません)

Left : Without endpin
Right: On floor, with steel pipe endpin
Cello: Cello-1 (8-year-old)
70 times slower, silent video

Reference post:
--> https://advancedendpinholder.blogspot.com/
--> 94..Resonance Direction-C
--> 94..Cello-1 on C(C-G) Resonance Direction and V/H-Ratio

1A6D#. Cello-1 Simulation x300 slower

[ 3/19/2020 ] Labels: 1A6D#.Resonance A

D# (1A6D#, 313Hz, 3.20mS) Typical Resonance Simulation:
Oscilloscope charts below show us a clear gap in phase between V-mic and H-mic.
In this case, the resonance direction is not along round-slice-level of cello but along the height(neck - tail pin).

Without endpin(left) vs Steel-pipe endpin floating(right)
Titanium endpin on floor(left) vs 8mm Metal-rod endpin on floor(right)
Cello: Cello-1 (8-year-old)
300 times slower, silent video

Reference post: -- https://advancedendpinholder.blogspot.com/
-- 93..Resonance Direction-A2
-- 93..Cello-1, Cello-2 on A -Resonance Direction-

3G9E. Cello-1 Wolf-tone Simulation x100 slower

[ 3/04/2020 ] Labels: 3G9E.Resonance G

Wolf tones are relating with the pure(/simple, perfect) vibration of top-plate.
When the E(/F) pitch forced to shift slightly high or low, top-plate gives up the current wave cycle then creates a new one.

Cello: Cello-1 (8-year-old)
100 times slower, silent video

Reference post:
--> https://advancedendpinholder.blogspot.com/
--> 63.Wolf tone
--> 63. Memo for wolf tones

1A4C#. Cello-1 Simulation x220 slower

[ 2/29/2020 ] Labels: 1A4C#.Resonance A

C# (278Hz, 1A4C#) Typical Resonance Simulation:
Cello is often impacted by mechanical resonance of endpin.

Left : Without endpin
Right: On floor, Titanium endpin
Cello: Cello-1 (8-year-old)
220 times slower, silent video
Reference post:
--> https://advancedendpinholder.blogspot.com/
--> 92..Resonance Direction-A
--> 92..Cello-1 on A -V/H Amplitude Ratio-