Squawk (sound)
Encyclopedia
Squawks or short wheeze
s are brief "squeaky" sounds that are also referred to as squeaks. Their waveforms show a sinusoidal
pattern with a duration 10 to 100 ms
and a frequency between 200 and 800 Hz
. Squawks have been described in bird fancier's disease and other forms of hypersensitivity pneumonitis
. They are also heard in a variety of conditions in which alveolitis
is present. In one study they were found in 10% of patients with pneumonia
.
Wheeze
A wheeze is a continuous, coarse, whistling sound produced in the respiratory airways during breathing. For wheezes to occur, some part of the respiratory tree must be narrowed or obstructed, or airflow velocity within the respiratory tree must be heightened...
s are brief "squeaky" sounds that are also referred to as squeaks. Their waveforms show a sinusoidal
Sine wave
The sine wave or sinusoid is a mathematical function that describes a smooth repetitive oscillation. It occurs often in pure mathematics, as well as physics, signal processing, electrical engineering and many other fields...
pattern with a duration 10 to 100 ms
Millisecond
A millisecond is a thousandth of a second.10 milliseconds are called a centisecond....
and a frequency between 200 and 800 Hz
Hertz
The hertz is the SI unit of frequency defined as the number of cycles per second of a periodic phenomenon. One of its most common uses is the description of the sine wave, particularly those used in radio and audio applications....
. Squawks have been described in bird fancier's disease and other forms of hypersensitivity pneumonitis
Hypersensitivity pneumonitis
Hypersensitivity pneumonitis is an inflammation of the alveoli within the lung caused by hypersensitivity to inhaled organic dusts. Sufferers are commonly exposed to the dust by their occupation or hobbies.-Pathophysiology:Hypersensitivity pneumonitis involves inhalation of an antigen...
. They are also heard in a variety of conditions in which alveolitis
Alveolitis
Alveolitis can refer to two inflammatory conditions. It can refer to inflammation of the alveoli in the lungs, or the dental alveolus in the jaw.Alveolus in the jaw is also known as dry socket...
is present. In one study they were found in 10% of patients with pneumonia
Pneumonia
Pneumonia is an inflammatory condition of the lung—especially affecting the microscopic air sacs —associated with fever, chest symptoms, and a lack of air space on a chest X-ray. Pneumonia is typically caused by an infection but there are a number of other causes...
.