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A440 (also known as Stuttgart pitch [1]) is the musical pitch corresponding to an audio frequency of 440 Hz, which serves as a tuning standard for the musical note of A above middle C, or A 4 in scientific pitch notation. It is standardized by the International Organization for Standardization as ISO 16.
] A = 440 Hz. In practice most orchestras tune to a note given out by the oboe, and most oboists use an electronic tuning device when playing the tuning note. Some orchestras tune using an electronic tone generator. [25]
Motion of an A-440 tuning fork (greatly exaggerated) vibrating in its principal mode A tuning fork is a fork-shaped acoustic resonator used in many applications to produce a fixed tone. The main reason for using the fork shape is that, unlike many other types of resonators, it produces a very pure tone , with most of the vibrational energy at ...
These weights permitted setting it to different reference frequencies (such as A 4 = 435 Hz), although over a relatively narrow range, perhaps a whole tone. When set at A 4 = 440 Hz the tuning fork produced a 55 Hz signal, which drove the four-pole 1650 RPM synchronous motor to which the A disc was mounted. (The other discs were all gear-driven ...
The Texas Instruments SN76489 is a programmable sound generator chip from the 1980s, used to create music and sound effects on computers and video game systems. Initially developed by Texas Instruments for its TI-99/4A home computer, it was later updated and widely adopted in systems like the BBC Micro , ColecoVision , IBM PCjr , Sega's Master ...
The PTX8 has mixed stereo L/R outputs and 8 individual outputs (one per Tone Generator). When none of the individual outputs are being used, tone generators are panned across the stereo output. Tone generators 3 & 4 are panned left, 1, 2, 7, & 8 are panned center; 5 & 6 are panned right.
The QY10's tone generator is a sample-based synthesizer using Yamaha's 12-bit Advanced Wave Memory synthesis technology. The tone generator is eight part multi-timbral (i.e., eight instruments may sound at once) and 28 note polyphonic (i.e., 28 notes may sound at once), which provides adequate support for sequences written on the unit. In other ...
Simplified diagram of how a tonewheel works Goldschmidt tone wheel (1910), used as an early beat frequency oscillator. A tonewheel or tone wheel is a simple electromechanical apparatus used for generating electric musical notes in electromechanical organ instruments such as the Hammond organ and in telephony to generate audible signals such as ringing tone.
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