Thomas
Braunstorfinger und Martin Hisch, GbR
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GuitarTuner
The operation is quite easy and intuitive and well known from other instrument tuners. GuitarTuner is chromatic which means that not only the six guitar strings are detected but all other notes from the deepest bass up to the highest piano key. (In addition also non musical tones can be analyzed for examples mechanical vibrations of engines) The display depends on the orientation, which is detected automatically :
With the
left softkey, you can display some
help or info about the program. At the left upper corner is the display refresh rate which should be 1 or 2. Below is the tuning display where green means well tuned and red mistuned. The graphics display shows the tuning reference (normally 440 Hz), which be changed by pressing the keys <1> and <2>. Please be aware, that tuning will always start at 440 Hz after restarting the program. At the right side you will find the detected note. Due to the harmonics characteristic of a swinging guitar (3rd and 5th order) string sometimes this display is not perfectly stable, but the right note is always dominant. The pointer shows the current tuning like the bar graph above but analogue. The two lowest lines are not really important
for the tuning but are nice additional info : The standard tuning mode is "FFT" which means, that the spectrum is searched for the highest peak and some smart post processing is performed in order to find the right tone whith the best possible accuracy. Due to the fact that sampling time is limited,
the standard mode is ok for all six strings of a standard guitar but turns a
little bit rough for bass guitars or other sound sources emitting frequencies of
100 Hz and below. Happy Tuning ! How to connect an electric guitar
(First of all, you can tune your E-Guitar over the air – try it, often this
works!) Buy the two plugs and a short two-wire-cable. Solder the connections shown in following figure:
When connecting to the phone, select “Headset” from the menu. Calibration of GuitarTuner GuitarTuner is high-precision analyzer due to its dsp based algorithm. But it may be the case for some smart phone models that the sampling clock of the internal ADC is not exactly 4 kHz which is expected. This synthesis error is caused by a limited register length of the fractional divider which is used in a PLL to divide the crystal clock down to the sampling clock. Most smart phones (like the N95) have a very precise clock rate, so no calibration is needed at all. Others (like the E71) may have a small error of 3-4 cent). This is not really much and not a problem when you’re playing alone but may be a problem when playing in a group. To calibrate, generate a tone with a tuning fork, another guitar tuner, a tuned string or a PC software like Analyzer2000 which can be downloaded from www.brownbear.de. Use <1> and <2> to change the reference until the pointer is in the middle – now, it’s calibrated! |
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Please direct questions or comments regarding this website to
webmaster@brownbear.de
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is located
by default in the Applications Folder at the last position, so normally you have
to scroll down.
