Definition
Differentiate between audible,ultrasonic and infra-sonic frequency range and give examples
Sound waves are divided into three categories that cover different frequency ranges. They are as follows:
(1) Audible waves are waves that lie within the range of sensitivity of the human ear. They can be generated in a variety of ways, such as by musical instruments, human vocal cords, and loudspeakers.
(2) Infrasonic waves are waves having frequencies below the audible range. Elephants can use infrasonic waves to communicate with each other, even when separated by many kilometers.
(3) Ultrasonic waves are waves having frequencies above the audible range. Ultrasonic waves are used in medical imaging.
(1) Audible waves are waves that lie within the range of sensitivity of the human ear. They can be generated in a variety of ways, such as by musical instruments, human vocal cords, and loudspeakers.
(2) Infrasonic waves are waves having frequencies below the audible range. Elephants can use infrasonic waves to communicate with each other, even when separated by many kilometers.
(3) Ultrasonic waves are waves having frequencies above the audible range. Ultrasonic waves are used in medical imaging.
Example
Audible Range of Sound
The human ear responds to sounds with frequencies in the range from 20 Hz to 20,000 Hz. This is called the audible range of the human ear. Drums, guitar strings, tuning fork, human vocal cords and diaphragms of loudspeakers are examples of audible range of sound
Audible sound waves whose frequencies are less than 20 Hz are in the infrasonic range. Sound produced by earthquakes, thunder, volcanoes are in Infrasonic range. Human Ear cant hear this sound but elephants and whales can hear this.
Frequencies above 20,000 Hz are in the ultrasonic range. The audible range of dogs, cats, moths and mice extends into ultrasound frequencies. They can hear very high frequencies that humans cannot.
Audible sound waves whose frequencies are less than 20 Hz are in the infrasonic range. Sound produced by earthquakes, thunder, volcanoes are in Infrasonic range. Human Ear cant hear this sound but elephants and whales can hear this.
Frequencies above 20,000 Hz are in the ultrasonic range. The audible range of dogs, cats, moths and mice extends into ultrasound frequencies. They can hear very high frequencies that humans cannot.
Definition
Describe the persistence of audibility
The sensation of hearing produced by a sound is retained for a period of . This characteristics of the ear is the persistence of audibility. If another sound reaches the ear within , simultaneous hearing of both the sounds is experienced.
Definition
Define and discuss consonance
Consonance refers to repetitive sounds produced by consonants within a sentence or phrase. This repetition often takes place in quick succession such as in pitter, patter.
Example
Consonant and Consonance
Intervals are traditionally considered either consonant or dissonant. Consonant intervals are usually described as pleasant and agreeableConsonance is the repetition of a consonant sound and is typically used to refer to the repetition of sounds at the end of the word, but also refers to repeated sounds in the middle of a word. Examples of Consonance: Pitter Patter, Pitter Patter-repetition of the "t," and "r" sounds
Definition
Define dissonance
Dissonance is the quality of sounds that seems unstable and has an aural need to resolve to a stable consonance.
Definition
Define and discuss harmony and melody
Harmony is the process by which the composition of individual sounds, or superpositions of sounds, is analysed by hearing. Usually, this means simultaneously occurring frequencies, pitches (tones, notes), or chords.
A melody is a linear succession of musical tones that the listener perceives as a single entity.
A melody is a linear succession of musical tones that the listener perceives as a single entity.
Definition
Music Scales
In music theory, a scale is any set of musical notes ordered by fundamental frequency or pitch. A scale ordered by increasing pitch is an ascending scale, and a scale ordered by decreasing pitch is a descending scale. Some scales contain different pitches when ascending than when descending.
Definition
Define and discuss the musical scale
A musical scale is any set of musical notes ordered by fundamental frequency or pitch. A scale ordered by increasing pitch is an ascending scale, and a scale ordered by decreasing pitch is a descending scale. Some scales contain different pitches when ascending than when descending.
Definition
Understand working of stringed musical instruments and identify examples
A musical instrument is an instrument created or adapted to make musical sounds. In principle, any object that produces sound can be a musical instrumentit is through purpose that the object becomes a musical instrument.
String instruments, stringed instruments, or chordophones are musical instruments that produce sound from vibrating strings. In most string instruments, the vibrations are transmitted to the body of the instrument, which also vibrates, along with the air inside it.
Common instruments in the string family include the violin, guitar, sitar, electric bass, violan, cello, harp, double bass, rebab, banjo, mandolin, ukulele, and bouzouki.
String instruments, stringed instruments, or chordophones are musical instruments that produce sound from vibrating strings. In most string instruments, the vibrations are transmitted to the body of the instrument, which also vibrates, along with the air inside it.
Common instruments in the string family include the violin, guitar, sitar, electric bass, violan, cello, harp, double bass, rebab, banjo, mandolin, ukulele, and bouzouki.
Definition
Ultrasound
A sound wave of frequencies above 20 kHz is called ultrasound. Properties of ultrasound are due to its high frequencies. The energy carried by ultrasound is very high. It can travel along a well defined straight path. Due to its small wavelength, it does not bend appreciably and has a high directivity.
Definition
Understand the different parameters in the acoustic design of buildings
Parameters in the acoustic design of buildings:
Reverberation: A reverberation, or reverb, is created when a sound or signal is reflected causing a large number of reflections to build up and then decay as the sound is absorbed by the surfaces of objects in the space which could include furniture, people, and air.
Absorption and Reflection of sound: Absorption (acoustics) Acoustic absorption refers to the process by which a material, structure, or object takes in sound energy when sound waves are encountered, as opposed to reflecting the energy. Part of the absorbed energy is transformed into heat and part is transmitted through the absorbing body.
Reverberation: A reverberation, or reverb, is created when a sound or signal is reflected causing a large number of reflections to build up and then decay as the sound is absorbed by the surfaces of objects in the space which could include furniture, people, and air.
Absorption and Reflection of sound: Absorption (acoustics) Acoustic absorption refers to the process by which a material, structure, or object takes in sound energy when sound waves are encountered, as opposed to reflecting the energy. Part of the absorbed energy is transformed into heat and part is transmitted through the absorbing body.
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