A whistle is small a Instrument wind making it possible to produce a whistle. The whistles divide with the Flûte S the mechanism of production of the air by bevel.

This type of instrument is employed in various sporting disciplines for the arbitration, by the majority of the police services, for the monitoring of the bathes and intervenes in several Jouet S.

Certain whistles are known as with caster : a cylindrical cavity located at exit of bevel makes it possible to place a ball or a small cylinder. While whirling under the pressure of the air, the caster periodically comes to close the exit of bevel, which makes it possible to obtain a bearing in its product. Certain models of whistles without caster however make it possible to obtain this modulation of the sound, by a set of disturbances induced in the flow of outgoing air by the form even of bevel.

One also finds it like instrument with whole share, in a form with three tons (generally associated with a caster), in the musical genre of the samba. The three let us tons are obtained by stopping one or two of the side exits with the fingers, thus modifying the volume of air in the central cavity according to the same principle as on a flute.

Its version of whistle of referee of football is also employed like instrument of musical direction in the batteries of percussions, because its piercing and powerful sonority (approximately 110 dB (A)) enables him to be heard in spite of the high noise level.

Certain whistles, known as whistles with Ultrasound S, emit inaudible high frequency sounds by the human ear. They are used in the raising of certain animals, the such dogs, whose ear is sensitive to these frequencies.

Many a Appeau X functions containing whistle.

See too

• Whistle (ship)
• Whistle with nose

Simple: Whistle