![]() Invented around 1950 they haven't been outclassed by any modern method so far. Also: They DO work in the presence of other noises. The response is real-time and the accuracy reaches below one-tenth of a cent. They are the titans of the tuner industry: There ain't a tuning job a strobe tuner cannot do. The bars do not resonate that long, especially in overtones. Still the basic drawback of spectrum analysis remains: To find a frequency to 0.1Hz you have to count the pulses for 10+ seconds. Yet another way would be measuring the frequency electronically. This makes it impossible to view the readout instantly. It might really work, but when it comes to sub-Hz intervals, analysing the spectrum in very narrow intervals requires a sound sample of significant length. This had to be ruled out, as my ears can only detect a couple of cents of a difference - not really enough!Īnother method is spectrum analysis. ![]() The first method of tuning is to do so by ear, comparing the sound from some software generator and from the bar itself. A specific interval, or frequency ratio, between the modes has to be preserved for the piece of vibrating metal to sound like a vibraphone! This topic has well been documented by the marimba builders, who shape the bars out of rosewood. The bar has to be ground down in specific places to alter the frequencies of the modes. Vibe bars are commonly tuned in the fundamental and first two overtones. Another thing is the bars vibrate in multiple modes: the fundamental, lowest frequency mode determines the perceived pitch, and the higher modes are responsible for the overtones which shape the timbre of the sound. The reason is the process must be very accurate (definitely sub-1Hz) for the instrument to sound good. Two bars were missing, but I believed that while it might be too hard to make a full set, making just two might actually be possible.Īfter some research I found the main difficulty in making a bar is definitely its tuning. Then, by a blind stroke of luck, I found a set of vibraphone bars quite cheaply available on line. Nothing that cannot be made out of wood, aluminium bars or pipes. An instrument like that consists of a frame, aluminium bars or "keys" and pipes called resonators. ![]() The reason behind it is very simple: The cost of a complete instrument is prohibitive, and used vibraphones are seldom available - if ever. A long time ago, me and my girlfriend (a percussionist) decided we want to build a vibraphone.
0 Comments
Leave a Reply. |