Lena Torres
Sound frequency is a fundamental concept in acoustics, referring to the number of times a sound pressure wave repeats itself per second. Measured in hertz (Hz), frequency is what we perceive as pitch. Different sounds have different frequencies, for example, a drum beat has a lower frequency than a whistle. The audible frequency range for humans is typically between 20 Hz and 20,000 Hz, though this varies across species and can decrease with age. Understanding sound frequency is crucial for applications in audio engineering, linguistics, and medicine, as well as in the production of music, where it plays a key role in creating, mixing, and mastering sounds.
| Characteristics | Values |
|---|---|
| Definition | Frequency is the number of times per second that a sound pressure wave repeats itself. |
| Units | Hertz (Hz) |
| Audible frequency range for humans | 20 Hz to 20,000 Hz (20 kHz) |
| Frequency range for speech | The human voice typically operates within a specific frequency range: adult males average around 120 Hz, while adult females average around 210 Hz. |
| Ultrasound | Frequencies above the audible range, exceeding 20,000 Hz, fall into the category of ultrasound. |
| Infrasound | Frequencies below the audible range, typically below 20 Hz, are classified as infrasound. |
| Pitch | Frequency is sometimes referred to as pitch. The higher the frequency, the higher the pitch. |
| Amplitude | Amplitude is the relative strength of sound waves (transmitted vibrations), which we perceive as loudness or volume. Amplitude is measured in decibels (dB). |
| Hearing protection | When workplace sound levels reach or exceed 85 dB, employers must provide hearing protection. |
| Frequency analysis | Frequency analysis is used in acoustics, audio engineering, linguistics, and environmental studies. |
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What You'll Learn
Humans can hear frequencies between 20Hz and 20,000Hz
Sound is measured in terms of frequency and amplitude. Frequency, also referred to as pitch, is the number of times per second that a sound pressure wave repeats itself. The units of frequency are called hertz (Hz).
Humans with normal hearing can hear sounds between 20 Hz and 20,000 Hz. This range is commonly referred to as the audio frequency or audible frequency (AF). Frequencies below 20 Hz are generally felt rather than heard and are called infrasound. Sounds above 20,000 Hz are known as ultrasound.
The human auditory system is most sensitive to frequencies between 2,000 and 5,000 Hz. Individual hearing ranges vary according to the general condition of a person's ears and nervous system. The range tends to shrink during a person's life, usually beginning at around the age of eight with a reduction in the upper frequency limit. Women tend to lose their hearing less often than men, but experience a sharper hearing loss after menopause.
Hearing tests can be used to find the hearing thresholds of humans. These tests involve presenting tones at specific frequencies and intensities (loudness). When the subject hears the sound, they indicate this by raising a hand or pressing a button. The lowest intensity they can hear is recorded.
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Ultrasound frequencies are above 20,000Hz
Sound is a mechanical vibration wave that moves through a medium such as air or water. The pitch of a sound is determined by its frequency, which is the number of times per second that a sound pressure wave repeats itself. The units of frequency are called hertz (Hz).
The generally accepted standard hearing range for humans is 20 to 20,000 Hz (20 kHz). Frequencies below 20 Hz are generally felt rather than heard, and those above 20 kHz are called ultrasonic. Ultrasound is defined by the American National Standards Institute as "sound at frequencies greater than 20 kHz". This frequency is the approximate upper audible limit of human hearing in healthy young adults.
Ultrasound has many applications across different fields. Ultrasonic devices are used to detect objects and measure distances. Ultrasound imaging or sonography is used in medicine. Ultrasound is also used in the nondestructive testing of products and structures to detect invisible flaws. Industrially, ultrasound is used for cleaning, mixing, and accelerating chemical processes.
Ultrasonic cleaners, sometimes called supersonic cleaners, use frequencies from 20 to 40 kHz. They work by creating microscopic cavitation bubbles near the dirty surface, which then collapse and form tiny shock waves that break up and disperse contaminants. In ultrasonic welding of plastics, frequencies between 15 and 40 kHz are used to create heat through friction. Power ultrasound in the 20–100 kHz range is used in chemistry to speed up reactions. Ultrasound is also used in biology for analytical or chemical purposes (sonication and sonoporation) and to kill bacteria in sewage.
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Infrasound frequencies are below 20Hz
Sound is measured in terms of frequency and amplitude. Frequency, also referred to as pitch, is the number of times per second that a sound pressure wave repeats itself. The units of frequency are called hertz (Hz). Humans with normal hearing can hear sounds between 20 Hz and 20,000 Hz. Frequencies above 20,000 Hz are known as ultrasound, and frequencies below 20 Hz are called infrasound or infrasonic.
Infrasound is characterised by its ability to get around obstacles with little dissipation. It is often associated with natural occurrences, such as volcanic eruptions, wind turbines, and ocean swells, as well as industrial installations and low-speed machinery. These sound waves are not easily absorbed, allowing them to travel around the Earth multiple times and be detected across large distances.
While infrasound waves are considered inaudible to humans, they can be perceived by the human ear and body when the intensity is sufficiently strong. At higher intensities, infrasound vibrations can be felt in various parts of the body. In addition, humans can hear frequencies below 20 Hz at relatively high levels, although such levels are not commonly found in everyday life.
Infrasound has been the subject of various studies and applications. It is used to monitor earthquakes and volcanoes, to study the human cardiovascular system, and to identify nuclear detonations. In music, infrasound can be produced by large pipe organs or exotic loudspeaker designs such as subwoofers.
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Frequency is measured in Hertz (Hz)
Sound is a collection of waveforms that move through the air and reach our ears. The frequency of sound refers to how often these waveforms occur in a specific amount of time. The unit of sound frequency is the hertz (Hz).
Frequency is sometimes referred to as pitch, and it is the number of times per second that a sound pressure wave repeats itself. For example, a drum beat has a much lower frequency than a whistle, and a bullfrog call has a lower frequency than a cricket. The lower the frequency, the fewer the oscillations, while high frequencies produce more oscillations.
The audible frequency range for humans is typically between 20 Hz and 20,000 Hz (20 kHz). However, the high-frequency limit usually reduces with age. Frequencies above 20,000 Hz are known as ultrasound, and while they are inaudible to humans, they are important in medical imaging, industrial applications, and animal communication. For instance, some dog breeds can perceive vibrations up to 60,000 Hz.
In the field of acoustics, sound frequency analysis is crucial for various applications, including audio engineering, speech pattern recognition, and noise control. Acousticians and sound engineers use methods like n-octave filtering and Fast Fourier Transform (FFT) to analyse sound frequency. This allows them to break down complex sounds into simpler components, facilitating better sound design and auditory health measures.
Understanding the full spectrum of sound frequencies, including those beyond human hearing, is essential in scientific, medical, and industrial fields. For example, ultrasound technology is widely used in medical diagnostics and industrial cleaning processes. Additionally, in music production, sound engineers and producers use a range of sound frequencies to create, mix, and master music that sounds good together.
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Frequency is referred to as pitch
Sound is a collection of waveforms that move through the air and reach our ears. The frequency of a sound wave refers to how often or how frequently these waveforms occur in a specific amount of time. The unit of frequency is called hertz (Hz). The higher the frequency, the more oscillations are produced.
Every musical note is associated with a unique frequency. The human voice typically operates within a specific frequency range: adult males generally have an average fundamental frequency of around 120 Hz, while adult females average around 210 Hz.
The audible frequency range for humans is typically between 20 Hz and 20,000 Hz (20 kHz). Frequencies below 20 Hz are generally felt rather than heard and are called infrasound. Frequencies above 20,000 Hz are called ultrasound and are inaudible to humans. However, ultrasound frequencies play a significant role in medical imaging and animal communication.
Frequency analysis is crucial in acoustics and audio engineering. Acousticians and sound engineers use techniques like n-octave band analysis and Fast Fourier Transform (FFT) to analyze sound frequency and identify noise sources. This knowledge is essential for optimizing sound quality, designing acoustically optimized spaces, and protecting hearing health.
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Frequently asked questions
Sound frequency refers to how often sound waveforms occur in a specific amount of time. The unit of sound frequency is Hertz (Hz).
The audible frequency range for humans is typically between 20Hz and 20,000Hz (20kHz). However, the upper limit of this range decreases with age.
Sound frequency analysis is crucial in acoustics and audio engineering. It helps in designing acoustically optimised spaces, improving sound quality, and protecting hearing health. It is also used in speech pattern recognition and environmental noise source identification.
