Sound is vibration, as perceived by the sense of hearing. We usually hear vibrations that travel through air, but sound can also travel through gases, liquids and solids. It cannot travel through a vacuum (such as exists in outer space). When the vibrations reach our ears, they are converted into nerve impulses that are sent to our brains, allowing us to perceive the sound. In more technical language, sound "is an alternation in pressure, particle displacement, or particle velocity propagated in an elastic material" (Olson 1957 ...

Including:

• Sound - Attributes of sound
• Sound - Frequency and wavelength
• Sound - Amplitude
• Sound - Velocity
• Sound - Types of sounds
• Sound - Perception of sound
• Sound - Sound measurement

Read more here: » Sound: Encyclopedia - Sound

The characteristics of sound are frequency, wavelength, amplitude and velocity. Sound - Frequency and wavelength. The frequency is the number of air pressure oscillations per second at a fixed point occupied by a sound wave. One single oscillatory cycle per second corresponds to 1 Hz. The wavelength is the distance between two successive crests and is the distance that a wave ...

See also:

Sound, Sound - Attributes of sound, Sound - Frequency and wavelength, Sound - Amplitude, Sound - Velocity, Sound - Types of sounds, Sound - Perception of sound, Sound - Sound measurement

Read more here: » Sound: Encyclopedia II - Sound - Attributes of sound

Noises are irregular and disordered vibrations including all possible frequencies. Their wave diagram does not repeat in time. Noise is an aperiodic series of waves. Sounds that are sine waves with fixed frequency and amplitude are perceived as pure tones. While sound waves are usually visualised as sine waves, sound waves can have arbitrary shapes and frequency content, limited only by the apparatus that generates them and the medium through which they travel. In fact, most sound waves consist of multiple overtones or h ...

See also:

Sound, Sound - Attributes of sound, Sound - Frequency and wavelength, Sound - Amplitude, Sound - Velocity, Sound - Types of sounds, Sound - Perception of sound, Sound - Sound measurement

Read more here: » Sound: Encyclopedia II - Sound - Types of sounds

The frequency range of sound audible to humans is approximately between 20 and 20,000 Hz. This range varies by individual and generally shrinks with age. It is also an uneven curve - sounds near 3,500 Hz are often perceived as louder than a sound with the same amplitude at a much lower or higher frequency. Above and below this range are ultrasound and infrasound, respectively. The amplitude range of sound for humans has a lower limit of 0dBSPL, called the threshold of hearing. Sound is technically at its upper limit at 194.09 dB. A ...

See also:

Sound, Sound - Attributes of sound, Sound - Frequency and wavelength, Sound - Amplitude, Sound - Velocity, Sound - Types of sounds, Sound - Perception of sound, Sound - Sound measurement

Read more here: » Sound: Encyclopedia II - Sound - Perception of sound