Tone generator

In 1897 german physicist K.F.Braun engineered the first oscilloscope.

Three crossed turning forks are in Yamaha brand logo.

Osciloscopes are used not only in the audio (music) industry, but also science laboratories, hospitals and clinics.

Chord consists of minimum three diffrent notes.

Use of spectrum analyzer provides a plot and trace of signal amplitude in the frequency domain.

There are two types of spectrum analyzers: swept-tuned and time-sequence.

Tuning fork is a tool used to pitch musical instruments.

Following the discovery of fast Fourier transform, in 1962 the first spectrum analyzer was engineered.

Chords contain tierces (thirds).

Tuning fork was invented by lute musician.

Highest note define the position of chord.

The first of real time computer games was made for oscilloscope. "Tennis for two" was programmed by William Higinbotham in 1958....

Oscilloscopes are used to observe the change of electrical signal over time.

Drum sounds can't be compononents of a chord. Chords can only consist of certain notes.

Since 1939 binding sound for pitching musical instruments is in 440Hz frequency. Formerly it was 432Hz.

Nowadays there are many kinds of spectrum analyzers: stationary, portable, handhled and networked.