Kinky Stardust (Acoustic Guitar Pickup): Unterschied zwischen den Versionen
Amir (Diskussion | Beiträge) |
Amir (Diskussion | Beiträge) Keine Bearbeitungszusammenfassung |
||
| (9 dazwischenliegende Versionen desselben Benutzers werden nicht angezeigt) | |||
| Zeile 29: | Zeile 29: | ||
===== Research on existing pickups ===== | ===== Research on existing pickups ===== | ||
So, i did some research on usual pickup technologies and guess what i found? None of them really met my specifications. Also existing DIY solutions tended to fail my specifications utterly | So, i did some research on usual pickup technologies and guess what i found? None of them really met my specifications. Also existing DIY solutions tended to fail my specifications utterly | ||
and were mostly very crude (gluing a piezo directly to guitar - seriously?). Well, after ruling out picking the sound up from the strings directly i saw two options: Picking up vibrations | and were mostly very crude (gluing a piezo transducer directly to guitar and drilling holes in my guitar - seriously?). Well, after ruling out picking the sound up from the strings directly (which btw. only works with western guitars) i saw two options: Picking up vibrations | ||
of the corpus directly (e.g contact mic) or picking up "airborne" sonics (e.g. classic microphone). Both have their pros and cons: e.g a contact mic has a very low susceptibility to background | of the corpus directly (e.g contact mic) or picking up "airborne" sonics (e.g. classic microphone). Both have their pros and cons: e.g a contact mic has a very low susceptibility to background | ||
noise whereas a classic microphone is more true to the sound of the guitar. That ment i needed a third option - a mix of both techniques. I | noise whereas a classic microphone is more true to the sound of the guitar. That ment i needed a third option - a mix of both techniques. I figured acoustic emissions sensors (AES) would be a good starting point and I investigated different designs and decided to modify one of the approaches i found: | ||
emissions sensors (AES) and decided to modify one of the approaches i found: | |||
<gallery> | <gallery> | ||
Datei:AE-Transducer.gif|Acoustic Emission Transducer | Datei:AE-Transducer.gif|Acoustic Emission Transducer | ||
| Zeile 40: | Zeile 39: | ||
After some experiments i build a pickup to the above AES design and step by step came up with three major modifications (which actually make my pickup work very differently compared to an AES - but anyway it was my starting point): | After some experiments i build a pickup to the above AES design and step by step came up with three major modifications (which actually make my pickup work very differently compared to an AES - but anyway it was my starting point): | ||
# There is no couplant and the wear plate doesn't directly touch the object. Instead i left an air cushion of about a 1.5 centimeters between them. Note that the chamber between object and case is airtight. | # There is no couplant and the wear plate doesn't directly touch the object. Instead i left an air cushion of about a 1.5 centimeters between them. Note that the chamber between object and case is airtight. | ||
# I also introduced a gap (about 3mm) between the backside of the piezo element and the dampening material and drilled a small hole (~ 1mm) in the dampening material, so that the backside | # I also introduced a gap (about 3mm) between the backside of the piezo element and the dampening material and drilled a small hole (~ 1mm) in the dampening material, so that the backside pocket is not airtight. | ||
pocket is not airtight. | # I used hard rubber as case material (i tried metal first). | ||
# I used hard rubber as case material. | |||
===== Theories™ ===== | ===== Theories™ ===== | ||
| Zeile 52: | Zeile 50: | ||
was pretty satisfied with the results except for two issues: | was pretty satisfied with the results except for two issues: | ||
1. Even the most careful handling (touching) of the guitar was picked up very loudly. | 1. Even the most careful handling (touching) of the guitar was picked up very loudly. | ||
2. The FFT ( | 2. The FFT (on a Rigol oscilloscope) showed significant beat noise. | ||
After some theorizing I figured the beat noise was the result of the different speeds of sound conducted in the (solid) cover and the air cushion. So i replaced the metal cover with a hard | After some theorizing I figured the beat noise was the result of the different speeds of sound conducted in the (solid) cover and the air cushion. So i replaced the metal cover with a hard | ||
rubber cover which actually fixed both issues. The beat noise was reduced to a very minimum and the handling noise became very acceptable. | rubber cover which actually fixed both issues. The beat noise was reduced to a very minimum and the handling noise became very acceptable. | ||
| Zeile 58: | Zeile 56: | ||
===== The Result ===== | ===== The Result ===== | ||
# Has very decent sound quality, with | # Has very decent sound quality, with dampening on the lower frequencies and a bit stronger dampening on the higher frequencies - still resulting in an easy to correct curve. | ||
# Is rather easy to mount. | # Is rather easy to mount and doesn't require invasive modifications to the guitar. | ||
# Doesn't hinder guitar playing (at least as far as I'm aware of) | # Doesn't hinder guitar playing (at least as far as I'm aware of) | ||
# Hasn't been tested with different guitars but it seems to do a good job on preserving the characteristics of the guitar. | # Hasn't been tested with different guitars but it seems to do a good job on preserving the characteristics of the guitar. | ||
| Zeile 66: | Zeile 64: | ||
# Profit! | # Profit! | ||
===== Video | ===== Comparisions, DSP Analysis, Graphs and Samples ===== | ||
TBD | |||
===== Video and Pics ===== | |||
Usage video (Please note that i forged the audio, recording it a second time directly to my usb sound interface because i didn't have a decent microphone with me. gonna re-record tomorrow but believe me it sounds real good on the guitar amp. It also should be noted that i didn't do equalization, which would be easy to do, because i wanted to convey the unaltered sound) | Usage video (Please note that i forged the audio, recording it a second time directly to my usb sound interface because i didn't have a decent microphone with me. gonna re-record tomorrow but believe me it sounds real good on the guitar amp. It also should be noted that i didn't do equalization, which would be easy to do, because i wanted to convey the unaltered sound) | ||
| Zeile 77: | Zeile 79: | ||
Datei:ksp_hole.jpg|The "breathing hole" | Datei:ksp_hole.jpg|The "breathing hole" | ||
</gallery> | </gallery> | ||
===== Addendum (1): "The Toy" ===== | |||
I thought with a little imagination it is pretty obvious what kind of toy it was i re-purposed. Apparently i was wrong, since several people asked. | |||
Anyway, I decided to draw a picture: | |||
[[File:hideous.jpg|thumb|left|One Ring to rule them all, One Ring to find them, One Ring to bring them all and in the darkness bind them]] | |||
===== Addendum (2): Alternative Use-Cases ===== | |||
[[File:ksp_medical.jpg|thumb|left|Medical Applications]] | |||
[[File:ksp_security.jpg|thumb|left|Security Research]] | |||